This study investigated the reduction of volatile organic compounds (VOCs) from waste polypropylene (PP) from automobile bumpers by supercritical carbon dioxide (scCO2) extraction. The scCO2 extraction was performed with varying temperatures, pressures, and times in the range of 313–353 K, 10–25 MPa, and 1–6 h, respectively. At 333 K, 25 MPa, and 6 h, highly efficient removal of xylene, styrene, and total VOCs were observed, with removal percentages of >98 %. Optimal condition for VOC removal using scCO2 based on response surface methodology was determined to be 313 K, 10 MPa, and 2.17 h. No differences in size and color were observed in the scCO2-treated PP pellets. Moreover, VOC removal using scCO2 did not induce noticeable changes in the chemical and thermal properties of the treated PP samples. This result demonstrated that scCO2 extraction is a promising method for the VOC removal from automobile plastic waste.
{"title":"VOC removal from automotive waste by supercritical CO2 extraction","authors":"Sabrinna Wulandari , Jongho Choi , DaeSung Jung , Aye Aye Myint , Jaehoon Kim","doi":"10.1016/j.jcou.2024.102940","DOIUrl":"10.1016/j.jcou.2024.102940","url":null,"abstract":"<div><div>This study investigated the reduction of volatile organic compounds (VOCs) from waste polypropylene (PP) from automobile bumpers by supercritical carbon dioxide (scCO<sub>2</sub>) extraction. The scCO<sub>2</sub> extraction was performed with varying temperatures, pressures, and times in the range of 313–353 K, 10–25 MPa, and 1–6 h, respectively. At 333 K, 25 MPa, and 6 h, highly efficient removal of xylene, styrene, and total VOCs were observed, with removal percentages of >98 %. Optimal condition for VOC removal using scCO<sub>2</sub> based on response surface methodology was determined to be 313 K, 10 MPa, and 2.17 h. No differences in size and color were observed in the scCO<sub>2</sub>-treated PP pellets. Moreover, VOC removal using scCO<sub>2</sub> did not induce noticeable changes in the chemical and thermal properties of the treated PP samples. This result demonstrated that scCO<sub>2</sub> extraction is a promising method for the VOC removal from automobile plastic waste.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102940"},"PeriodicalIF":7.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-01DOI: 10.1016/j.jcou.2024.102951
J.C. Martínez-Fuentes, I. Martínez-López, J. Bueno-Ferrer, G. Garrigós Pastor, E. Guillén-Bas, A. Davó-Quiñonero, D. Lozano-Castelló, A. Bueno-López
Steel honeycomb monoliths have been manufactured by Fused Deposition Modelling-FDM 3D printing technology using 90 % 17–4 PH steel nanoparticles-loaded polymer filament. Pure steel monoliths were obtained after thermal removal of the polymer and steel sintering. NiO-CeO2 active phase nanoparticles were loaded on powder steel and on the steel monoliths, and the supported catalysts were tested in the hydrogenation of CO2 to CH4, paying special attention to the steel pretreatment before active phase loading. The catalytic experiments confirm that totally functional catalysts have been prepared, showing 100 % selective conversion of CO2 to CH4 above 225 ºC and stability in long-term experiments (18 hours at 325 ºC). The catalytic behaviour is improved by H2O2-pretreatment of the steel honeycomb monoliths before the active phase loading. XPS characterization confirms that the surface of the catalysts is oxidised on the fresh catalysts and gets even more oxidised after the catalytic tests. The H2O2-pretreatment of the steel support partially avoids the additional oxidation under reaction conditions, keeping chromium and cerium cations less oxidised than on the catalyst prepared with untreated steel. In addition, evidence about the electronic interaction between the steel support and the NiO-CeO2 (np) active phase are obtained.
{"title":"3D printed steel monoliths for CO2 methanation: A feasibility study","authors":"J.C. Martínez-Fuentes, I. Martínez-López, J. Bueno-Ferrer, G. Garrigós Pastor, E. Guillén-Bas, A. Davó-Quiñonero, D. Lozano-Castelló, A. Bueno-López","doi":"10.1016/j.jcou.2024.102951","DOIUrl":"10.1016/j.jcou.2024.102951","url":null,"abstract":"<div><div>Steel honeycomb monoliths have been manufactured by Fused Deposition Modelling-FDM 3D printing technology using 90 % 17–4 PH steel nanoparticles-loaded polymer filament. Pure steel monoliths were obtained after thermal removal of the polymer and steel sintering. NiO-CeO<sub>2</sub> active phase nanoparticles were loaded on powder steel and on the steel monoliths, and the supported catalysts were tested in the hydrogenation of CO<sub>2</sub> to CH<sub>4</sub>, paying special attention to the steel pretreatment before active phase loading. The catalytic experiments confirm that totally functional catalysts have been prepared, showing 100 % selective conversion of CO<sub>2</sub> to CH<sub>4</sub> above 225 ºC and stability in long-term experiments (18 hours at 325 ºC). The catalytic behaviour is improved by H<sub>2</sub>O<sub>2</sub>-pretreatment of the steel honeycomb monoliths before the active phase loading. XPS characterization confirms that the surface of the catalysts is oxidised on the fresh catalysts and gets even more oxidised after the catalytic tests. The H<sub>2</sub>O<sub>2</sub>-pretreatment of the steel support partially avoids the additional oxidation under reaction conditions, keeping chromium and cerium cations less oxidised than on the catalyst prepared with untreated steel. In addition, evidence about the electronic interaction between the steel support and the NiO-CeO<sub>2</sub> (np) active phase are obtained.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102951"},"PeriodicalIF":7.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-01DOI: 10.1016/j.jcou.2024.102954
Cheng Zhang , Ning Zhou , Shiting Wang , Xiaoxia Yang , Tingyan Peng , Zhifeng Dai , Feiyong Xiang , Yubing Xiong
The efficient conversion of atmospheric CO2 into high value-added chemicals remains a persistent challenge. In this study, a novel strategy for the fabrication of triazine- and amino-functionalized poly(ionic liquid)s (PILs) was reported. By virtue of the rich nitrogen species, the newly-developed PILs possessed great potential in CO2 conversion to produce high-value chemicals. The systematic investigation illustrated that rich-nitrogen PILs could promote the cycloaddition reaction of CO2 and epoxides through the intramolecular synergy of multiple active sites. Excellent conversion and selectivity were achieved under the mild conditions without any co-catalysts and solvents. In addition, PIL heterogeneous catalysts could be easily recovered and reused at least several times without obvious loss in activity. The density functional theory calculation demonstrated that the superior catalytic activity of rich nitrogen PILs was attributed to the synergistic effect of hydrogen bond donor and triazine ring in the catalytic process. Our finding thus presents a versatile platform for fabricating multi-functional heterogeneous catalysts for efficient CO2 conversion.
将大气中的二氧化碳高效转化为高附加值化学品仍是一项长期挑战。本研究报道了一种新型的三嗪和氨基功能化聚（离子液体）（PILs）制备策略。凭借丰富的氮物种，新开发的 PILs 在二氧化碳转化生产高价值化学品方面具有巨大潜力。系统研究表明，富氮 PILs 可通过分子内多个活性位点的协同作用促进 CO2 与环氧化物的环化反应。在温和的条件下，无需任何助催化剂和溶剂，即可实现优异的转化率和选择性。此外，PIL 多相催化剂可以很容易地回收并重复使用至少多次，而不会明显丧失活性。密度泛函理论计算表明，富氮 PILs 的优异催化活性归因于氢键供体和三嗪环在催化过程中的协同效应。因此，我们的发现为制造多功能异相催化剂提供了一个多功能平台，可用于高效转化二氧化碳。
{"title":"Triazine- and amino-functionalized poly(ionic liquid) heterogeneous catalyst for efficient CO2 conversion under mild conditions","authors":"Cheng Zhang , Ning Zhou , Shiting Wang , Xiaoxia Yang , Tingyan Peng , Zhifeng Dai , Feiyong Xiang , Yubing Xiong","doi":"10.1016/j.jcou.2024.102954","DOIUrl":"10.1016/j.jcou.2024.102954","url":null,"abstract":"<div><div>The efficient conversion of atmospheric CO<sub>2</sub> into high value-added chemicals remains a persistent challenge. In this study, a novel strategy for the fabrication of triazine- and amino-functionalized poly(ionic liquid)s (PILs) was reported. By virtue of the rich nitrogen species, the newly-developed PILs possessed great potential in CO<sub>2</sub> conversion to produce high-value chemicals. The systematic investigation illustrated that rich-nitrogen PILs could promote the cycloaddition reaction of CO<sub>2</sub> and epoxides through the intramolecular synergy of multiple active sites. Excellent conversion and selectivity were achieved under the mild conditions without any co-catalysts and solvents. In addition, PIL heterogeneous catalysts could be easily recovered and reused at least several times without obvious loss in activity. The density functional theory calculation demonstrated that the superior catalytic activity of rich nitrogen PILs was attributed to the synergistic effect of hydrogen bond donor and triazine ring in the catalytic process. Our finding thus presents a versatile platform for fabricating multi-functional heterogeneous catalysts for efficient CO<sub>2</sub> conversion.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102954"},"PeriodicalIF":7.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, the influence of the silica modulus of alkaline activators on the overall performances of pure fly ash (FA)-based High-Strength Engineered/Strain-Hardening Geopolymer Composites (HS-EGC/SHGC) was comprehensively studied. The developed HS-EGC successfully presented simultaneous high compressive strength (over 90 MPa) and high tensile ductility (over 6.0 %) for the first time. Tensile strain-hardening and over-saturated cracking phenomena were observed for all the HS-EGC mixes. It was found that the increase of the silica modulus from 1.0 to 2.0 reduced the tensile strength and strain energy density of HS-EGC, but the most distinguished overall mechanical index was achieved in the mix with the silica modulus of 1.5. Additionally, the underlying mechanism behind the mechanical performances was explored by Back Scattering Electron and Energy Dispersive Spectroscopy (BSE-EDS) tests. According to the data comparison from literature review, the good sustainability and market potential of the developed material were successfully demonstrated, and the developed HS-EGC pushed the performance envelope of pure FA-based EGC materials. The findings could help promote the future development and practical applications of this strain-hardening geopolymer material with both good sustainability and high mechanical performances.
{"title":"Low-carbon high-strength engineered geopolymer composites (HS-EGC) with full-volume fly ash precursor: Role of silica modulus","authors":"Ling-Yu Xu , Jian-Cong Lao , Lan-Ping Qian , Mehran Khan , Tian-Yu Xie , Bo-Tao Huang","doi":"10.1016/j.jcou.2024.102948","DOIUrl":"10.1016/j.jcou.2024.102948","url":null,"abstract":"<div><div>In this study, the influence of the silica modulus of alkaline activators on the overall performances of pure fly ash (FA)-based High-Strength Engineered/Strain-Hardening Geopolymer Composites (HS-EGC/SHGC) was comprehensively studied. The developed HS-EGC successfully presented simultaneous high compressive strength (over 90 MPa) and high tensile ductility (over 6.0 %) for the first time. Tensile strain-hardening and over-saturated cracking phenomena were observed for all the HS-EGC mixes. It was found that the increase of the silica modulus from 1.0 to 2.0 reduced the tensile strength and strain energy density of HS-EGC, but the most distinguished overall mechanical index was achieved in the mix with the silica modulus of 1.5. Additionally, the underlying mechanism behind the mechanical performances was explored by Back Scattering Electron and Energy Dispersive Spectroscopy (BSE-EDS) tests. According to the data comparison from literature review, the good sustainability and market potential of the developed material were successfully demonstrated, and the developed HS-EGC pushed the performance envelope of pure FA-based EGC materials. The findings could help promote the future development and practical applications of this strain-hardening geopolymer material with both good sustainability and high mechanical performances.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102948"},"PeriodicalIF":7.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-01DOI: 10.1016/j.jcou.2024.102942
F. Schinnerl , T. Sattler , G. Noori-Khadjavi , M. Lehner
Mineral carbonation of secondary materials offers an innovative way of storing carbon dioxide in materials that instead would mostly go to waste. This study investigates the carbonation efficiency (CE) of 11 different secondaries from refractory production, waste incineration, and the paper industry compared to untreated and thermally activated serpentinite. To determine the chemical and mineralogical composition of the materials, various analytical methods, like X-ray fluorescence, X-ray diffraction, scanning electron microscopy, Brunauer-Emmet-Teller and thermogravimetric analysis have been employed, both before and after the direct aqueous carbonation process. Each material was examined over reaction times of 6 & 10 hours at 180 °C and a starting pressure of 20 bar in a 0.6 L stainless steel batch reactor. The received results were then compared to the theoretical CO2 uptake, defined as the maximum carbon dioxide storage potential achievable if all Ca, Fe and Mg ions were converted to carbonates. The findings indicate carbonation efficiencies of 14–65 % for secondary materials, compared to 0.7–14 % observed in the serpentinite samples. The highest uptakes were achieved by the refractory materials, primarily due to their high metal oxide content. However, a negative impact was observed from graphite-based carbon binders in the refractories, with increased leaching of these binders leading to a decrease in carbonation efficiency. Materials with higher SiO2 content showed reduced performance, suggesting a passivation layer buildup during carbonation.
二次材料的矿物碳化提供了一种将二氧化碳储存在材料中的创新方法，而这些材料大多会被废弃。本研究对来自耐火材料生产、垃圾焚烧和造纸工业的 11 种不同二次材料的碳化效率（CE）进行了调查，并与未经处理和热激活的蛇纹石进行了比较。为了确定材料的化学和矿物成分，在直接水溶液碳化过程之前和之后采用了各种分析方法，如 X 射线荧光、X 射线衍射、扫描电子显微镜、布鲁瑙尔-艾美特-泰勒和热重分析。每种材料都在 0.6 升不锈钢间歇式反应器中，在 180 °C 和 20 巴的起始压力下，经过 6 & 和 10 小时的反应时间进行了检测。然后将所得结果与理论二氧化碳吸收量进行比较，理论二氧化碳吸收量是指在钙、铁和镁离子全部转化为碳酸盐的情况下可实现的最大二氧化碳储存潜力。研究结果表明，次生材料的碳化效率为 14-65%，而蛇纹岩样本的碳化效率为 0.7-14%。耐火材料的吸收率最高，这主要是由于其金属氧化物含量较高。不过，耐火材料中的石墨基碳粘结剂也产生了负面影响，这些粘结剂的沥滤增加导致碳化效率降低。二氧化硅含量较高的材料性能下降，这表明在碳化过程中出现了钝化层堆积。
{"title":"Direct aqueous mineral carbonation of secondary materials for carbon dioxide storage","authors":"F. Schinnerl , T. Sattler , G. Noori-Khadjavi , M. Lehner","doi":"10.1016/j.jcou.2024.102942","DOIUrl":"10.1016/j.jcou.2024.102942","url":null,"abstract":"<div><div>Mineral carbonation of secondary materials offers an innovative way of storing carbon dioxide in materials that instead would mostly go to waste. This study investigates the carbonation efficiency (CE) of 11 different secondaries from refractory production, waste incineration, and the paper industry compared to untreated and thermally activated serpentinite. To determine the chemical and mineralogical composition of the materials, various analytical methods, like X-ray fluorescence, X-ray diffraction, scanning electron microscopy, Brunauer-Emmet-Teller and thermogravimetric analysis have been employed, both before and after the direct aqueous carbonation process. Each material was examined over reaction times of 6 & 10 hours at 180 °C and a starting pressure of 20 bar in a 0.6 L stainless steel batch reactor. The received results were then compared to the theoretical CO<sub>2</sub> uptake, defined as the maximum carbon dioxide storage potential achievable if all Ca, Fe and Mg ions were converted to carbonates. The findings indicate carbonation efficiencies of 14–65 % for secondary materials, compared to 0.7–14 % observed in the serpentinite samples. The highest uptakes were achieved by the refractory materials, primarily due to their high metal oxide content. However, a negative impact was observed from graphite-based carbon binders in the refractories, with increased leaching of these binders leading to a decrease in carbonation efficiency. Materials with higher SiO<sub>2</sub> content showed reduced performance, suggesting a passivation layer buildup during carbonation.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102942"},"PeriodicalIF":7.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Construction and Demolition Wastes (CDW) have a significant impact on global waste streams. Brick waste stands out as a prominent type of CDW, and numerous studies have explored its recycling for the creation of environmentally-friendly concrete. Reverse design of recycled brick aggregate concrete (RBAC) mixture proportion is presented in this paper with a focus on four key objectives, that is: compressive strength, cost, and environmental elements (i.e., energy consumption and carbon emission). Based on compiled experimental datasets of 374 samples, the back propagation neural network (BP), random forest (RF), and four meta-heuristic algorithm optimization models were constructed to achieve the desired compressive strength objective. In all machine learning (ML) methods, the compressive strength of RBAC can be predicted with high accuracy, with the SSA-BP (optimized back propagation neural network model using the sparrow search algorithm) model achieving superior results (i.e., NSE=0.91, RPD=3.2). The SSA-BP is therefore used as the objective function for compressive strength. The economic objective is primarily influenced by material costs, and the objective functions of energy consumption and carbon emission are determined by various aspects of production, transportation, and their mixing processes. In order to obtain the optimal RBAC design, the Non-Dominated Sorting Genetic Algorithm (NSGA-III) was implemented considering imperative constraints. Results indicate that cement amount and recycled brick aggregate (RBA)-to-natural aggregate proportion have a positive impact on the compressive strength. The suggested design framework allows for the creation of RBAC composite designs with varying levels of RBA substitution rates and strength targets, providing valuable guidance for tackling the CDW challenge and optimizing RBA usage.
{"title":"Reverse design for mixture proportions of recycled brick aggregate concrete using machine learning-based meta-heuristic algorithm: A multi-objective driven study","authors":"Yuhan Wang , Shuyuan Zhang , Zhe Zhang , Yong Yu , Jinjun Xu","doi":"10.1016/j.jcou.2024.102944","DOIUrl":"10.1016/j.jcou.2024.102944","url":null,"abstract":"<div><div>Construction and Demolition Wastes (CDW) have a significant impact on global waste streams. Brick waste stands out as a prominent type of CDW, and numerous studies have explored its recycling for the creation of environmentally-friendly concrete. Reverse design of recycled brick aggregate concrete (RBAC) mixture proportion is presented in this paper with a focus on four key objectives, that is: compressive strength, cost, and environmental elements (i.e., energy consumption and carbon emission). Based on compiled experimental datasets of 374 samples, the back propagation neural network (BP), random forest (RF), and four meta-heuristic algorithm optimization models were constructed to achieve the desired compressive strength objective. In all machine learning (ML) methods, the compressive strength of RBAC can be predicted with high accuracy, with the SSA-BP (optimized back propagation neural network model using the sparrow search algorithm) model achieving superior results (i.e., NSE=0.91, RPD=3.2). The SSA-BP is therefore used as the objective function for compressive strength. The economic objective is primarily influenced by material costs, and the objective functions of energy consumption and carbon emission are determined by various aspects of production, transportation, and their mixing processes. In order to obtain the optimal RBAC design, the Non-Dominated Sorting Genetic Algorithm (NSGA-III) was implemented considering imperative constraints. Results indicate that cement amount and recycled brick aggregate (RBA)-to-natural aggregate proportion have a positive impact on the compressive strength. The suggested design framework allows for the creation of RBAC composite designs with varying levels of RBA substitution rates and strength targets, providing valuable guidance for tackling the CDW challenge and optimizing RBA usage.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102944"},"PeriodicalIF":7.2,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-28DOI: 10.1016/j.jcou.2024.102937
Yao Du , Yuxuan Qi , Qiang Zeng , Liangtong Zhan , Jiyang Wang , Zhidong Zhang
Inspired by the wisdom of Tabia, an ancient building material with superior mechanical properties, this paper utilized accelerated CO2 mineralization (CM) method to treat silty waste soil (SWS) with active lime after the pressing forming process for construction block manufacture. The influence of Ca(OH)2 content and curing duration were explored. Results indicate that the generated CaCO3 could fill pores and improve strength of the SWS blocks after CM treatment. At the optimal Ca(OH)2 content of 15 % and curing duration of 24 h, the CM-SWS blocks possessed the compressive strength of 12.8 MPa, CO2 emissions of 84.59 kgCO2/m3 and cost of 196.26 CNY/m3, comparable with or superior than the commercial blocks. The findings would deepen the mechanistic understandings of CM treatment in material reinforcement, and pave a proof-of-concept path to sustainably upgrade the SWS of poor engineering performance for building material production.
{"title":"Enlightenment of ancient Tabia for sustainable construction material manufacture by accelerated CO2 treatment","authors":"Yao Du , Yuxuan Qi , Qiang Zeng , Liangtong Zhan , Jiyang Wang , Zhidong Zhang","doi":"10.1016/j.jcou.2024.102937","DOIUrl":"10.1016/j.jcou.2024.102937","url":null,"abstract":"<div><div>Inspired by the wisdom of Tabia, an ancient building material with superior mechanical properties, this paper utilized accelerated CO<sub>2</sub> mineralization (CM) method to treat silty waste soil (SWS) with active lime after the pressing forming process for construction block manufacture. The influence of Ca(OH)<sub>2</sub> content and curing duration were explored. Results indicate that the generated CaCO<sub>3</sub> could fill pores and improve strength of the SWS blocks after CM treatment. At the optimal Ca(OH)<sub>2</sub> content of 15 % and curing duration of 24 h, the CM-SWS blocks possessed the compressive strength of 12.8 MPa, CO<sub>2</sub> emissions of 84.59 kgCO<sub>2</sub>/m<sup>3</sup> and cost of 196.26 CNY/m<sup>3</sup>, comparable with or superior than the commercial blocks. The findings would deepen the mechanistic understandings of CM treatment in material reinforcement, and pave a proof-of-concept path to sustainably upgrade the SWS of poor engineering performance for building material production.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102937"},"PeriodicalIF":7.2,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.jcou.2024.102938
Yi Tang , Keke Yu , Chuang He , Lidan Gao , Haiming Yang , Haijie He , An-Nan Zhong
Cement is essential for the construction industry, but its production process generates a large amount of CO2, adversely affecting the environment. To address the issue above, carbonation curing serving as one of the efficient carbon reduction approaches is widely adopted benefiting from its advantages of rapidly realizing carbon sequestration and enhancing the performance of cementitious materials. Numerous studies have indicated that the addition of low-reactivity minerals such as limestone, quartz, sandstone, and glass powder accelerates the carbonation reaction of cement composites. However, there is a lack of reviews on the application of low-activity minerals in carbonation-cured cementitious materials. Therefore, this paper presents a comprehensive review regarding the research progress on the application of low-reactivity minerals in carbonation-cured cement-based materials for the first time. This review first introduces the effect of low-activity minerals on the performance of carbonation-cured cement composites. Subsequently, the related mechanism is analyzed. Finally, the future research directions and challenges in this field are emphasized. This work provides insights and references for the application of low-reactivity minerals in carbonation-cured cement-based materials, thus contributing to carbon emission reduction in the cement industry.
{"title":"Research progress on the application of low-reactivity minerals in carbonation-cured cement-based materials","authors":"Yi Tang , Keke Yu , Chuang He , Lidan Gao , Haiming Yang , Haijie He , An-Nan Zhong","doi":"10.1016/j.jcou.2024.102938","DOIUrl":"10.1016/j.jcou.2024.102938","url":null,"abstract":"<div><div>Cement is essential for the construction industry, but its production process generates a large amount of CO<sub>2</sub>, adversely affecting the environment. To address the issue above, carbonation curing serving as one of the efficient carbon reduction approaches is widely adopted benefiting from its advantages of rapidly realizing carbon sequestration and enhancing the performance of cementitious materials. Numerous studies have indicated that the addition of low-reactivity minerals such as limestone, quartz, sandstone, and glass powder accelerates the carbonation reaction of cement composites. However, there is a lack of reviews on the application of low-activity minerals in carbonation-cured cementitious materials. Therefore, this paper presents a comprehensive review regarding the research progress on the application of low-reactivity minerals in carbonation-cured cement-based materials for the first time. This review first introduces the effect of low-activity minerals on the performance of carbonation-cured cement composites. Subsequently, the related mechanism is analyzed. Finally, the future research directions and challenges in this field are emphasized. This work provides insights and references for the application of low-reactivity minerals in carbonation-cured cement-based materials, thus contributing to carbon emission reduction in the cement industry.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102938"},"PeriodicalIF":7.2,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-25DOI: 10.1016/j.jcou.2024.102936
Alberto Maria Gambelli
Within the range of temperatures suitable for CO2/CH4 replacement, propane can form hydrates at widely milder conditions than those required for methane and carbon dioxide hydrates. Recent studies proved that the addition of minor quantities of propane to carbon dioxide strongly enhances replacement process, both in terms of methane recovery and carbon dioxide storage. At the same time, the capture of propane remains limited, even if the thermodynamic conditions are widely suitable for its capture. This study experimentally provided a coherent explanation of such a process. Hydrates were formed and dissociated on a lab-scale reactor with binary mixtures containing 90 vol% of CO2/CH4 and 10 vol% of C3H8; the results were compared with the phase equilibrium conditions of the pure species, obtained with the same procedure. The promoting/inhibiting effect of propane on the forming system was quantified and explained in terms of typology of hydrate structure formed and cage occupancy. Based on the results achieved in this study, the replacement mechanism, in presence of propane, was finally characterized and compared with the results obtained when replacement was carried out with the same procedure but with pure carbon dioxide and CO2/N2 mixtures.
{"title":"Hydrates production with gaseous CO2/C3H8 and CH4/C3H8 (90/10 vol%) mixtures and definition of the role of propane during CO2/CH4 replacement processes","authors":"Alberto Maria Gambelli","doi":"10.1016/j.jcou.2024.102936","DOIUrl":"10.1016/j.jcou.2024.102936","url":null,"abstract":"<div><div>Within the range of temperatures suitable for CO<sub>2</sub>/CH<sub>4</sub> replacement, propane can form hydrates at widely milder conditions than those required for methane and carbon dioxide hydrates. Recent studies proved that the addition of minor quantities of propane to carbon dioxide strongly enhances replacement process, both in terms of methane recovery and carbon dioxide storage. At the same time, the capture of propane remains limited, even if the thermodynamic conditions are widely suitable for its capture. This study experimentally provided a coherent explanation of such a process. Hydrates were formed and dissociated on a lab-scale reactor with binary mixtures containing 90 vol% of CO<sub>2</sub>/CH<sub>4</sub> and 10 vol% of C<sub>3</sub>H<sub>8</sub>; the results were compared with the phase equilibrium conditions of the pure species, obtained with the same procedure. The promoting/inhibiting effect of propane on the forming system was quantified and explained in terms of typology of hydrate structure formed and cage occupancy. Based on the results achieved in this study, the replacement mechanism, in presence of propane, was finally characterized and compared with the results obtained when replacement was carried out with the same procedure but with pure carbon dioxide and CO<sub>2</sub>/N<sub>2</sub> mixtures.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102936"},"PeriodicalIF":7.2,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-24DOI: 10.1016/j.jcou.2024.102939
Yongcheng Ji, Mohammed Galal Sallam Qasem , Tiandong Xu, Algunaid Omar Yahya Mohammed
The mechanical properties of recycled rubber desert sand concrete were studied to determine the effect of the replacement rate of recycled rubber and desert sand. The replacement rates of recycled rubber aggregates were set to 0 %, 5 %, 10 %, and 15 %, respectively, and for dessert sand aggregates were set to 0 %, 10 %, 20 %, and 30 %, respectively, during concrete preparation. The concrete's compressive, tensile, and freeze-thaw mechanical properties were tested at each replacement rate. The experimental results show that when the replacement rate of desert sand increases from 0 % to 30 %, the replacement rate of recycled rubber is 15 %, and the splitting tensile strength of concrete shows a pattern of first increasing and then decreasing. When the replacement rate for desert sand is 30 %, the replacement rate for recycled rubber rises from 0 % to 15 %, and the splitting tensile strength shows a pattern of first decreasing. With replacement rates of 10 percent for recycled rubber aggregate and 20 percent for desert sand aggregate, the damage to the concrete from external forces is relatively ideal. The compressive strength values are the highest, and the split tensile strength is the best, demonstrating good compressive and tensile strength. The results of CO2 emission analysis show that as the amount of recycled rubber increases, the CO2 emissions per unit volume of concrete also increase. The interface of the micro-optical structure in the concrete is straightforward, the pores are few, and it exhibits good mechanical properties. The concrete undergoes freeze-thaw cycles with relatively stable changes in compressive strength and split tensile strength, demonstrating a solid freeze-thaw resistive mechanical property.
{"title":"Mechanical properties investigation on recycled rubber desert sand concrete","authors":"Yongcheng Ji, Mohammed Galal Sallam Qasem , Tiandong Xu, Algunaid Omar Yahya Mohammed","doi":"10.1016/j.jcou.2024.102939","DOIUrl":"10.1016/j.jcou.2024.102939","url":null,"abstract":"<div><div>The mechanical properties of recycled rubber desert sand concrete were studied to determine the effect of the replacement rate of recycled rubber and desert sand. The replacement rates of recycled rubber aggregates were set to 0 %, 5 %, 10 %, and 15 %, respectively, and for dessert sand aggregates were set to 0 %, 10 %, 20 %, and 30 %, respectively, during concrete preparation. The concrete's compressive, tensile, and freeze-thaw mechanical properties were tested at each replacement rate. The experimental results show that when the replacement rate of desert sand increases from 0 % to 30 %, the replacement rate of recycled rubber is 15 %, and the splitting tensile strength of concrete shows a pattern of first increasing and then decreasing. When the replacement rate for desert sand is 30 %, the replacement rate for recycled rubber rises from 0 % to 15 %, and the splitting tensile strength shows a pattern of first decreasing. With replacement rates of 10 percent for recycled rubber aggregate and 20 percent for desert sand aggregate, the damage to the concrete from external forces is relatively ideal. The compressive strength values are the highest, and the split tensile strength is the best, demonstrating good compressive and tensile strength. The results of CO<sub>2</sub> emission analysis show that as the amount of recycled rubber increases, the CO<sub>2</sub> emissions per unit volume of concrete also increase. The interface of the micro-optical structure in the concrete is straightforward, the pores are few, and it exhibits good mechanical properties. The concrete undergoes freeze-thaw cycles with relatively stable changes in compressive strength and split tensile strength, demonstrating a solid freeze-thaw resistive mechanical property.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"88 ","pages":"Article 102939"},"PeriodicalIF":7.2,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2212982024002749/pdfft?md5=9f4eadda4475c43824f260ea0c4b60f6&pid=1-s2.0-S2212982024002749-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142316276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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