Biomass & Bioenergy最新文献_第3页

Impact of acid washing and torrefaction on biomass pyrolysis characteristics and product distribution 酸洗和热解对生物质热解特性和产品分布的影响

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-31 DOI: 10.1016/j.biombioe.2024.107455

Hong Tian, Xiaodie Zhang, Xiong Gao, Zhen Zhou, Shan Cheng, Chenyang Sun

This work examined a new coupled pretreatment method was investigated, namely, coupled pretreatment by aqueous phase bio-oil (APBO) acid washing and torrefaction, aimed at enhancing the quality of bio-oil and improving hydrocarbon selectivity during catalytic fast pyrolysis (CFP) of wheat straw. The experimental results showed that APBO was more effective in removing AAEMs compared to acetic acid, the removal of K was as high as 98.77 %. Torrefaction, on the other hand, decreases the O content and the O/C molecular molar ratio. Thermogravimetry analysis (TGA) results showed that the coupled pretreatment method raised the maximum loss rate of the samples suggesting the promotion of cellulose and hemicellulose pyrolysis. Coupled pretreatment resulted in a decrease in acids and ketones and an increase in sugars and phenols in the pyrolyzed bio-oil. Upon adding the HZSM-5 catalyst after the coupled pretreatment, hydrocarbon production was significantly enhanced, leading to an increase in hydrocarbon yield from 28.06 % in the original sample to 49.5 % in the coupled pretreated sample. This coupled pretreatment method presents a novel approach for achieving high-quality and selective bio-oil conversion during CFP of biomass.

本研究探讨了一种新的耦合预处理方法，即水相生物油（APBO）酸洗和热解耦合预处理，旨在提高小麦秸秆催化快速热解（CFP）过程中生物油的质量并改善碳氢化合物的选择性。实验结果表明，与醋酸相比，APBO 能更有效地去除 AAEMs，对 K 的去除率高达 98.77%。而另一方面，腐熟会降低 O 含量和 O/C 分子摩尔比。热重分析（TGA）结果表明，耦合预处理方法提高了样品的最大损耗率，表明促进了纤维素和半纤维素的热解。耦合预处理使热解生物油中的酸和酮减少，糖和酚增加。在耦合预处理后加入 HZSM-5 催化剂，碳氢化合物的产量显著提高，碳氢化合物的产量从原始样品的 28.06% 提高到耦合预处理样品的 49.5%。这种耦合预处理方法为在生物质 CFP 过程中实现高质量和选择性生物油转化提供了一种新方法。

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引用次数: 0

Study on the mechanism of hydrogen production from bamboo gasification in supercritical water by ReaxFF molecular dynamics simulation 利用 ReaxFF 分子动力学模拟研究超临界水中竹材气化制氢的机理

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-31 DOI: 10.1016/j.biombioe.2024.107472

Yue Qiu , Shenghui Rao , Lihu Zhong , Yuhui Wu , Runqiu Dong , Zhigang Liu , Jingwei Chen , Lei Yi , Bin Chen

In the context of sustainable development, biomass and clean energy have garnered significant attention. At present, the inefficient utilization of biomass leads to a significant waste of resources. Supercritical water gasification technology not only facilitates the resourceful utilization of biomass but also generates hydrogen. This paper presents a molecular dynamics simulation study on bamboo as the subject for investigation, complemented by experimental validation to ascertain the efficacy of the simulation outcomes. The bamboo model is prepared by mixing Crystalline Cellulose Iβ, (1 → 4)-β-D-xylopyranose, α-L-arabinofuranose-(1 → 3)-β-D-xylopyranose, and two syringyl units connected by a β-O-4 bond in a ratio of 46:13:15:26. The study analyzes the influence of various parameters on the gasification results and elucidates the gasification reaction mechanism of bamboo in supercritical water. The results indicate that at a reaction temperature of 4300 K and a feedstock concentration of 5 wt%, the H₂ yield reaches 85.6 % of the total output. Additionally, the reactive force field molecular dynamics method was used to simulate the SCWG process of bamboo, providing theoretical support for improving gasification efficiency. The simulation results show that bamboo decomposition is accompanied by chain cleavage, ring-opening reactions, and the formation of small molecules. Furthermore, the study explored the formation pathways of carbon dioxide and hydrogen.

在可持续发展的背景下，生物质和清洁能源备受关注。目前，生物质的低效利用造成了严重的资源浪费。超临界水气化技术不仅有利于生物质的资源化利用，还能产生氢气。本文以竹子为研究对象，进行了分子动力学模拟研究，并辅以实验验证，以确定模拟结果的有效性。竹子模型是由结晶纤维素 Iβ、（1 → 4）-β-D-吡喃木糖、α-L-阿拉伯呋喃糖-（1 → 3）-β-D-吡喃木糖和两个以 β-O-4 键连接的丁香基单元按 46:13:15:26 的比例混合而成。研究分析了各种参数对气化结果的影响，并阐明了竹子在超临界水中的气化反应机理。结果表明，在反应温度为 4300 K、原料浓度为 5 wt% 的条件下，H₂ 的产量达到总产量的 85.6%。此外，还利用反应力场分子动力学方法模拟了竹子的 SCWG 过程，为提高气化效率提供了理论支持。模拟结果表明，竹材分解伴随着链裂解、开环反应和小分子的形成。此外，研究还探讨了二氧化碳和氢气的形成途径。

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引用次数: 0

Demand-driven wood/bamboo doors: Carbon storage potential and greenhouse gas footprint 需求驱动的木门/竹门：碳储存潜力和温室气体足迹

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-30 DOI: 10.1016/j.biombioe.2024.107451

Zhiping Wang , Rongjun Zhao , Jinmei Xu , Shuangbao Zhang , Zhangjing Chen , Wenfa Xiao

Due to large number of doors used housing and construction products, the greenhouse gas (GHG) footprint related to door manufacturing is an interesting topic. Timber and bamboo products can reduce GHG emission due to their biogenic carbon storage via photosynthesis. The scientific evidence on the climate impact using wood-based door (WBD) and bamboo-based door (BBD) to replace steel-based door (SBD) is limited. In this study, life cycle assessments for WBD, BBD, SBD were conducted to evaluate the carbon impacts of raw materials, production, transport, and end-of-life stages. The GHG footprint of WBD, BBD, and SBD ranged from 270.42 to 363.24, 285.31–398.31, and 983.8–986.76 kg CO₂ e/m³, respectively, indicating that the bio-based doors exhibited lower energy consumption and GHG emissions. The raw material stage (484.78–569.34 kg CO₂ e/m³) was identified as a major source of GHG emissions throughout the product life cycle, while hot-pressing and coating processes were identified as emission hotspots in the production stage. Regarding biogenic carbon storage, the use of bio-based materials instead of steel-based materials for fire door manufacturing significantly reduced emissions. Considering disposal methods, recycling and incineration should be prioritized over landfills. Future research should focus on field survey in raw material stage, along with conducting a technical and economic analysis. The results provide valuable guidance for selecting doors in China in term of biogenic carbon storage and resource protection.

由于住房和建筑产品中使用了大量的门，因此与门制造相关的温室气体（GHG）足迹是一个有趣的话题。木材和竹制品通过光合作用储存生物碳，可以减少温室气体排放。关于使用木质门（WBD）和竹质门（BBD）替代钢质门（SBD）对气候影响的科学证据还很有限。本研究对 WBD、BBD 和 SBD 进行了生命周期评估，以评估原材料、生产、运输和生命终结阶段的碳影响。WBD、BBD 和 SBD 的温室气体足迹分别为 270.42 至 363.24、285.31 至 398.31 和 983.8 至 986.76 kg CO2 e/m3，表明生物基木门的能耗和温室气体排放量较低。原材料阶段（484.78-569.34 kg CO2 e/m3）被认为是整个产品生命周期的主要温室气体排放源，而热压和涂层过程被认为是生产阶段的排放热点。在生物碳储存方面，使用生物基材料代替钢基材料制造防火门大大减少了排放量。考虑到处理方法，应优先考虑回收和焚烧，而不是填埋。未来的研究应侧重于原材料阶段的实地调查，同时进行技术和经济分析。研究结果为中国在生物碳储存和资源保护方面选择防火门提供了有价值的指导。

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引用次数: 0

Enhancing the potential for producing hydrogen-rich syngas through the steam gasification of low-value agro-industrial residues with torrefaction 通过蒸汽气化低价值农用工业残留物并进行高温分解，提高生产富氢合成气的潜力

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-30 DOI: 10.1016/j.biombioe.2024.107457

Jean Constantino Gomes da Silva , José Luiz Francisco Alves , Guilherme Davi Mumbach , Zhitong Yao , Silvia Layara Floriani Andersen , Regina de Fatima Peralta Muniz Moreira , Humberto Jorge Jose

Steam gasification is a highly effective method for producing hydrogen (H₂) and represents a key valorization route for agro-industrial residues. In this scenario, the objective of the current study was to investigate the effect of torrefaction on the steam gasification of low-value agro-industrial residues, focusing on enhancing H₂ content in syngas. Kinetic parameters were estimated, and syngas was quantified using macro-TGA/GC-TCD/FID. Torrefaction was performed under light (200 °C, 15–60 min), mild (250 °C, 15–60 min), and severe (300 °C, 15–60 min) conditions. The results revealed that torrefaction enhances H₂ content in syngas, with the H₂ molar fraction peaking at 62 % under severe conditions. Specifically, the H₂ molar concentration increased across all severities except for passion fruit peel waste at severe conditions, where a decline was observed. Ponkan peel waste showed a consistent rise in H₂ molar concentration at all torrefaction severities, with the most significant increase in the lower heating value of syngas. Additionally, torrefaction improved syngas composition by reducing the CO₂ fraction and increasing the CO fraction, thus enhancing the overall lower heating value of the syngas. The kinetic study, utilizing the Modified Random Pore Model (MRPM), demonstrated precise fits and provided reliable predictions for the impact of torrefaction on steam gasification. The reduction in rate constants suggests improved surface reactions and greater structural stability in gasification kinetics. The findings from this study support the adoption of torrefaction as a promising pre-treatment method to optimize biochar properties and maximize hydrogen-rich syngas production from low-value agro-industrial residues.

蒸汽气化是一种生产氢气（H2）的高效方法，也是农用工业残留物的一条重要价值化途径。在这种情况下，本研究的目的是探究高温分解对低价值农用工业残留物蒸汽气化的影响，重点是提高合成气中的 H2 含量。研究估算了动力学参数，并使用宏观 TGA/GC-TCD/FID 对合成气进行了定量。在轻度（200 °C，15-60 分钟）、轻度（250 °C，15-60 分钟）和重度（300 °C，15-60 分钟）条件下进行了热解。结果表明，在苛刻条件下，高温分解可提高合成气中的 H2 含量，H2 摩尔分数最高可达 62%。具体而言，除了百香果果皮废料在苛刻条件下的 H2 摩尔浓度有所下降外，其他所有苛刻条件下的 H2 摩尔浓度都有所上升。椪柑果皮废料的 H2 摩尔浓度在所有热值条件下都持续上升，其中以合成气热值较低时升幅最大。此外，通过减少 CO2 部分和增加 CO 部分，高温分解可改善合成气成分，从而提高合成气的整体低热值。利用改良随机孔隙模型（MRPM）进行的动力学研究表明，托烷硫化对蒸汽气化的影响具有精确的拟合和可靠的预测。速率常数的降低表明气化动力学中的表面反应得到了改善，结构稳定性得到了提高。这项研究的结果支持采用高温分解作为一种有前途的预处理方法，以优化生物炭的特性，并最大限度地利用低价值农工业残留物生产富氢合成气。

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引用次数: 0

Synergic effect of FeIII/g-C3N4 as photocatalyst for switchable alteration of furfural to succinic acid as well as maleic acid: A promising approach for sustainable chemical conversion and advanced environmental remediation FeIII/g-C3N4 作为光催化剂在将糠醛转化为琥珀酸和马来酸过程中的协同效应：有望实现可持续化学转化和先进环境修复的方法

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-30 DOI: 10.1016/j.biombioe.2024.107456

Mohammad Bashiri, Mona Hosseini-Sarvari

Furfural is one of the biomass compounds via potential applications in the production of value-added chemicals. However, its conversion to valuable products is challenging due to its complex structure. In this study, Fe^III/g-C₃N₄, a promising photocatalyst, is employed to facilitate the conversion of furfural under visible light conditions. The results demonstrate that the catalyst effectively promotes the switchable alteration of furfural into maleic acid, succinic acid, and furan. The production of maleic acid, succinic acid, and furan using a photocatalyst holds significant importance in the field of sustainable chemistry and renewable energy. These chemical compounds have various industrial applications and can be derived from renewable resources, making them environmentally friendly alternatives to traditional petrochemical-based products. By using electrochemical and photoelectrochemical analyses as well as various control experiments including reaction atmosphere and radical scavengers, a precise mechanism for the production of an active oxygen radical species has been presented.

糠醛是一种生物质化合物，具有生产高附加值化学品的潜在用途。然而，由于其结构复杂，将其转化为有价值的产品具有挑战性。本研究采用了一种前景看好的光催化剂 FeIII/g-C3N4，在可见光条件下促进糠醛的转化。结果表明，该催化剂能有效地促进糠醛向马来酸、琥珀酸和呋喃的转化。利用光催化剂生产马来酸、琥珀酸和呋喃在可持续化学和可再生能源领域具有重要意义。这些化合物具有多种工业用途，可从可再生资源中提取，是传统石化产品的环保替代品。通过电化学和光电化学分析以及包括反应气氛和自由基清除剂在内的各种控制实验，提出了活性氧自由基物种产生的精确机制。

{"title":"Synergic effect of FeIII/g-C3N4 as photocatalyst for switchable alteration of furfural to succinic acid as well as maleic acid: A promising approach for sustainable chemical conversion and advanced environmental remediation","authors":"Mohammad Bashiri, Mona Hosseini-Sarvari","doi":"10.1016/j.biombioe.2024.107456","DOIUrl":"10.1016/j.biombioe.2024.107456","url":null,"abstract":"<div><div>Furfural is one of the biomass compounds <em>via</em> potential applications in the production of value-added chemicals. However, its conversion to valuable products is challenging due to its complex structure. In this study, Fe<sup>III</sup>/g-C<sub>3</sub>N<sub>4</sub>, a promising photocatalyst, is employed to facilitate the conversion of furfural under visible light conditions. The results demonstrate that the catalyst effectively promotes the switchable alteration of furfural into maleic acid, succinic acid, and furan. The production of maleic acid, succinic acid, and furan using a photocatalyst holds significant importance in the field of sustainable chemistry and renewable energy. These chemical compounds have various industrial applications and can be derived from renewable resources, making them environmentally friendly alternatives to traditional petrochemical-based products. By using electrochemical and photoelectrochemical analyses as well as various control experiments including reaction atmosphere and radical scavengers, a precise mechanism for the production of an active oxygen radical species has been presented.</div></div>","PeriodicalId":253,"journal":{"name":"Biomass & Bioenergy","volume":"191 ","pages":"Article 107456"},"PeriodicalIF":5.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The carbon stability and energy characteristics of tea waste-derived biochar: Effects of pyrolytic temperature and co-pyrolysis with nanoscale zero-valent iron 茶叶废弃物衍生生物炭的碳稳定性和能量特性：热解温度和与纳米级零价铁共热解的影响

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-30 DOI: 10.1016/j.biombioe.2024.107458

Mengyuan Huang , Yu Xiang , Jinzhi Ni , Huiying Zhang , Ran Wei , Weifeng Chen

Pyrolytic temperature and Fe addition are two typical factors widely used for modifying the characteristic of biochar, however, their co-effect on the C emission reduction (enhancing C stability) and fuel features of tea waste biochar remain unclear. Hence, this study systematically investigated the effects of pyrolytic temperature (300–900 °C) and nanoscale zero-valent iron (Fe) co-pyrolysis on the C stability and fuel features of TBC. Herein, H/C, (O + N)/C, FTIR spectrum, XRD spectrum, I_g/(I_d + I_g) and DOC release suggested that pyrolytic temperature improvement decreased the aliphaticity, polarity and DOC content, but increased the aromaticity and graphitic degree for TBC. Meanwhile, Fe co-pyrolysis decreased the polarity and enhanced the graphitic degree of TBC at 800–900 °C. Thermogravimetric analysis indicated that Fe co-pyrolysis lowered the thermostability of C. Differently, H₂O₂ oxidization method indicated Fe co-pyrolysis significantly enhanced the chemical stability of C. Furthermore, Uv–vis and fluorescence spectrum indicated that pyrolytic temperature improvement decreased the aromaticity and molecular size of biochar-derived DOC. Fe co-pyrolysis increased the release of large molecular humic-like matters rather than small molecular protein-like matters. All the results suggested high pyrolytic temperature and Fe co-pyrolysis could improve the environmental (physico-chemical) C stability of TBC and the C emission reduction. Additionally, TBC presented a considerable energy densification ratio (EDR) ranges (1.355–1.450) of wood- and straw-derived biochars, indicating TBC could be a potential high-performance biofuel to alleviate the energy crisis. This study provides important information to optimize pyrolysis conditions to re-use of tea waste for C emission reduction and fuel substitute.

热解温度和铁添加量是两个被广泛用于改变生物炭特性的典型因素，但它们对茶叶废弃物生物炭的碳减排（提高碳稳定性）和燃料特性的共同影响仍不清楚。因此，本研究系统地研究了热解温度（300-900 °C）和纳米级零价铁（Fe）协同热解对茶叶废弃物生物炭的碳稳定性和燃料特性的影响。其中，H/C、（O + N）/C、傅立叶变换红外光谱、X 射线衍射光谱、Ig/（Id + Ig）和 DOC 释放量表明，热解温度的提高降低了 TBC 的脂肪族、极性和 DOC 含量，但提高了芳香族和石墨化程度。同时，在 800-900 °C 温度下，铁协同热解降低了 TBC 的极性，提高了其石墨化程度。热重分析表明，铁共热解降低了 C 的热稳定性。不同的是，H2O2 氧化法表明铁共热解显著提高了 C 的化学稳定性。铁协同热解增加了大分子腐殖质的释放，而不是小分子蛋白质类物质。所有这些结果表明，高热解温度和铁协同热解可以提高 TBC 的环境（物理化学）碳稳定性并减少碳排放。此外，TBC 的能量密度比（EDR）范围（1.355-1.450）与木材和秸秆衍生生物炭相当，这表明 TBC 有可能成为一种缓解能源危机的高性能生物燃料。这项研究为优化热解条件以重新利用茶叶废弃物实现碳减排和燃料替代提供了重要信息。

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引用次数: 0

Lignocellulosic biomass conversion into platform chemicals and biofuels using tetrahydrofuran-assisted pretreatment: A future for sustainable and bio-circular economy 利用四氢呋喃辅助预处理将木质纤维素生物质转化为平台化学品和生物燃料：可持续和生物循环经济的未来

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-29 DOI: 10.1016/j.biombioe.2024.107454

Lakshana G. Nair, Pradeep Verma

Organosolv pretreatment is an important strategy currently employed in biorefineries as an initial step for efficient lignocellulosic biomass (LCB) conversion into value-added products. The synthesis of different platform chemicals from LCB develops a bio-circular economy with reduced environmental hazards. Though various solvents have been employed in bioconversions, current research updates the application of Tetrahydrofuran (THF), a polar aprotic solvent. THF is an emerging solvent aiming at high-purity lignin retrieval with the successful separation of cellulose and hemicellulose fractions. The planar geometry of THF molecules provides a unique advantage for interactions with flat, nonpolar cellulose surfaces, thereby promoting LCB deconstruction and delignification. The CELF process, which leverages the use of THF and water co-solvent in the vicinity of a dilute acid environment, is a promising strategy for enhanced LCB fractionation that breaks down the lignin-carbohydrate matrix that enhances the yields of various fuel precursors directly from LCB, including furfural, HMF, LA, and glucose. Thus, the use of THF as an individual solvent or as a cosolvent in other pretreatment methods has been observed to significantly impact LCB breakdown and hence, is necessary to unlock the mystery behind the conversion efficiencies. The current review discusses the mechanism behind the properties of THF as a lignin-friendly solvent, as well as the strategies for using THF with other cosolvents. Further, the caveats during the use of the THF-assisted method are discussed, and insights into its sustainable management are considered an eco-friendly, effective solvent for the organosolv process in biorefineries to develop a bio-circular economy.

有机溶胶预处理是生物炼制厂目前采用的一项重要策略，是将木质纤维素生物质（LCB）高效转化为高附加值产品的第一步。从木质纤维素生物质中合成不同的平台化学品可以发展生物循环经济，减少对环境的危害。虽然生物转化过程中使用了各种溶剂，但目前的研究更新了极性钝溶剂四氢呋喃（THF）的应用。四氢呋喃是一种新兴的溶剂，旨在通过成功分离纤维素和半纤维素馏分来实现高纯度木质素回收。THF 分子的平面几何形状为与平整的非极性纤维素表面相互作用提供了独特的优势，从而促进了 LCB 的解构和脱木素。CELF 工艺利用稀酸环境中的四氢呋喃和水助溶剂，是一种很有前途的增强低浓纤维素酯分馏策略，它能分解木质素-碳水化合物基质，提高直接从低浓纤维素酯中提取各种燃料前体（包括糠醛、HMF、LA 和葡萄糖）的产量。因此，在其他预处理方法中使用四氢呋喃作为单独溶剂或助溶剂会对 LCB 分解产生显著影响，因此有必要揭开转化效率背后的奥秘。本综述讨论了 THF 作为木质素友好型溶剂的特性背后的机理，以及 THF 与其他助溶剂一起使用的策略。此外，还讨论了使用 THF 辅助方法过程中的注意事项，并深入探讨了其可持续管理问题，认为它是生物炼制厂中有机溶胶工艺的一种生态友好型有效溶剂，可促进生物循环经济的发展。

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引用次数: 0

Biohydrogen synthesis from food waste hydrolysate: Optimization using statistical design of experiments (DoE) and artificial neural network (ANN) 利用食物垃圾水解物合成生物氢：利用统计实验设计（DoE）和人工神经网络（ANN）进行优化

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-28 DOI: 10.1016/j.biombioe.2024.107452

Avinash Anand , Chandan Mahata , Vijayanand Suryakant Moholkar

Dark fermentation is an eco-friendly route for producing hydrogen, a clean next-generation fuel. The present study reports valorization of food waste to biohydrogen (bioH₂) through dark fermentation using Clostridium pasteurianum. The optimization of fermentation parameters using response surface methodology (RSM) with central composite design (CCD) resulted in bioH₂ yield = 1039 mL/L (1.58 mol/mol hexose sugars) for the conditions: pH = 6.5, temperature = 36 °C, TRS concentration = 10 g/L. An artificial neural network coupled with a genetic algorithm (ANN-GA) predicted the optimum parameter set as pH = 6.7, temperature = 36.8 °C, TRS concentration = 10.85 g/L. A bioH₂ yield of 1108 mL/L (1.73 mol/mol hexose sugar) was obtained for these conditions. The modified Gompertz model revealed a maximum bioH₂ production rate of 185.34 mL/L·h for ANN-GA conditions as compared to 153.74 mL/L·h for RSM-CCD predicted conditions. Fermentation at ANN-GA-predicted conditions revealed greater shift of metabolic intermediates towards acetic acid/butyric acid pathway, resulting in higher bioH₂ production. The ratio of acetic to butyric acid increased from 0.9 to 0.94, indicating metabolic shift favoring bioH₂ production. These results demonstrate superiority of ANN-GA technique for simulating behavior of a non-linear system like the metabolic pathway of C. pasteurianum.

暗发酵是生产氢这种清洁的下一代燃料的一种生态友好型途径。本研究报告利用巴氏梭菌通过暗发酵将食物垃圾转化为生物氢（bioH2）。在 pH = 6.5、温度 = 36 °C、TRS 浓度 = 10 g/L 的条件下，利用响应面方法学（RSM）和中央复合设计（CCD）对发酵参数进行了优化，得出生物氢产量 = 1039 mL/L（1.58 摩尔/摩尔己糖糖）。人工神经网络结合遗传算法（ANN-GA）预测的最佳参数设置为 pH = 6.7，温度 = 36.8 °C，TRS 浓度 = 10.85 克/升。在这些条件下，生物 H2 产量为 1108 mL/L（1.73 摩尔/摩尔己糖糖）。修改后的 Gompertz 模型显示，ANN-GA 条件下生物 H2 的最大生产率为 185.34 mL/L-h，而 RSM-CCD 预测条件下为 153.74 mL/L-h。在 ANN-GA 预测条件下发酵，代谢中间产物更多地转向乙酸/丁酸途径，从而产生更高的生物二氧化氢。乙酸与丁酸的比率从 0.9 增加到 0.94，表明代谢转变有利于生物 H2 的产生。这些结果表明，ANN-GA 技术在模拟巴氏菌代谢途径等非线性系统行为方面具有优越性。

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引用次数: 0

Research on the mechanism of hydrogen production by catalytic fast co-pyrolysis of cotton stalks and polypropylene: An experimental and theoretical study 棉秆和聚丙烯催化快速共热解制氢机理研究：实验和理论研究

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-28 DOI: 10.1016/j.biombioe.2024.107459

Lin Li , Langqi Shi , Zijun Zhang , Guang Sun , Zhaoying Li

The utilization of solid wastes such as biomass and plastics for energy production holds significant practical importance. This study conducts experimental research on microwave-assisted catalytic fast co-pyrolysis (co-CFP) of cotton stalks (CS) and polypropylene (PP) over alkali-modified HZSM-5 and Ni @ alkali-modified HZSM-5 for hydrogen production. The hydrogen production mechanism is carried out through experiments, reaction kinetics, and response surface method (RSM). The experimental results indicate that the optimal temperature for the co-CFP of CS and PP over 5%Ni-HT1.0 is 550 °C, and the hydrogen concentration is 37.9 vol%. The synergistic effect between CS and PP is explored by calculating comprehensive pyrolysis index. The activation energy is analyzed using the reaction kinetics Model-free integration methods (FWO and KAS), as well as model-fitting methods (CR). When the ratio of CS to PP is high (CS:PP = 1.0:0.5), the activation energy for the co-pyrolysis decreased. The addition of catalysts also has an important impact on the reduction of activation energy. By utilizing RSM to analyze the interactive effects on the generation of H₂. This study provides a new approach for the co-pyrolysis of biomass such and plastics for hydrogen production.

利用生物质和塑料等固体废物生产能源具有重要的现实意义。本研究对微波辅助催化棉秆（CS）和聚丙烯（PP）在碱改性 HZSM-5 和 Ni @ 碱改性 HZSM-5 上快速共热解（co-CFP）制氢进行了实验研究。通过实验、反应动力学和响应面法（RSM）研究了制氢机理。实验结果表明，5%Ni-HT1.0 上 CS 和 PP 的共 CFP 最佳温度为 550 ℃，氢气浓度为 37.9 vol%。通过计算综合热解指数，探讨了 CS 和 PP 之间的协同效应。使用反应动力学无模型积分法（FWO 和 KAS）以及模型拟合法（CR）分析了活化能。当 CS 与 PP 的比例较高时（CS:PP = 1.0:0.5），共热解的活化能降低。催化剂的添加对活化能的降低也有重要影响。通过利用 RSM 分析 H2 生成过程中的交互影响，该研究提供了一种新的方法来研究 H2 的生成过程。这项研究为生物质和塑料共热解制氢提供了一种新方法。

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引用次数: 0

Design and synthesis of novel ionic liquids for the dissolution and separation of waste poly-cotton fabrics 设计和合成用于溶解和分离废弃聚棉织物的新型离子液体

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy

Pub Date : 2024-10-28 DOI: 10.1016/j.biombioe.2024.107444

Huizheng Wu , Yan Long , Binqi Wang , Ruimei Cao , Rongtao Yang , Hongshuai Gao , Yi Nie

Ionic liquid (IL) serves as an eco-friendly solvent with significant potential to substitute toxic and environmentally harmful solvents used in the dissolution and separation of waste poly-cotton fabrics (WPCFs). Nonetheless, the inherent viscosity of ILs presents a challenge to the separation efficiency of WPCFs. To tackle this challenge, novel ILs with low viscosity were designed and synthesized in this study. Initially, the process of cellulose dissolution in five ILs was investigated by Molecular Dynamics (MD) simulations and in-situ polarized light microscope (PLM). The results demonstrated that the smaller the size of the anions and cations in ILs, the easier it is for them to penetrate the cellulose chain, interact with the hydroxyl groups on the cellulose chain, and form hydrogen bonds. Subsequently, the interaction mechanism between the five ILs and cellulose was further explored using the ¹H NMR and ¹³C NMR spectra analysis. Furthermore, rheological analysis was used to evaluate the viscosity of each ILs. The results revealed that [Mmim]MP exhibited the lowest viscosity at 25 °C, which was only 154.7 mPa s, and the wood pulp cellulose (WPC)/[Mmim]MP solution had the lowest viscosity than others. The degradation rate of [Mmim]MP-RCF was only 12 %, which was lower than some previously reported values. Ultimately, [Mmim]MP was employed for the dissolution and separation of WPCFs and the cotton dissolution rate reached 99 %, and the characterization results of the regenerated cellulose and polyester showed a superior separation of WPCFs. This research offered a potential novel solvent for WPCF recycling.

离子液体（IL）是一种生态友好型溶剂，具有替代用于溶解和分离废弃聚棉织物（WPCF）的有毒和有害环境溶剂的巨大潜力。然而，IL 固有的粘度对 WPCFs 的分离效率提出了挑战。为了应对这一挑战，本研究设计并合成了低粘度的新型 IL。首先，通过分子动力学（MD）模拟和原位偏光显微镜（PLM）研究了纤维素在五种 IL 中的溶解过程。结果表明，ILs 中阴阳离子的尺寸越小，它们就越容易穿透纤维素链，与纤维素链上的羟基相互作用并形成氢键。随后，利用 1H NMR 和 13C NMR 光谱分析进一步探讨了五种 IL 与纤维素之间的相互作用机理。此外，还利用流变分析评估了每种 IL 的粘度。结果显示，[Mmim]MP 在 25 °C 时的粘度最低，仅为 154.7 mPa s，木浆纤维素（WPC）/[Mmim]MP 溶液的粘度也比其他溶液最低。Mmim]MP-RCF 的降解率仅为 12%，低于之前报道的一些数值。最终，[Mmim]MP 被用于溶解和分离 WPCF，棉花溶解率达到 99%，再生纤维素和聚酯的表征结果表明 WPCF 的分离效果更佳。这项研究为 WPCF 的回收利用提供了一种潜在的新型溶剂。

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