Pub Date : 2021-08-08DOI: 10.1080/15422119.2021.1956539
Linisha Biswal, J. Goodwill, C. Janiak, Somak Chatterjee
ABSTRACT Fluoride and arsenic are hazardous inorganic contaminants due to associated health risks and relatively higher levels of occurrence in groundwater. Metal-organic frameworks, (MOFs) with their high surface area, versatile building blocks and numerous active sites, are a novel approach to fluoride and arsenic uptake. This review presents the different types of MOFs for fluoride and arsenic removal along with a study of dynamic breakthrough times and cost analysis. MOF performances are based on a variety of synthesis methods, notable among which solvothermal one is more described. However, all research works concluded that MOFs have poor yield compared to conventional adsorbents. But, their high adsorption capacity, tailored chemical structure and ionic uptake of fluoride and arsenic make them a more favorable option than many other adsorbents. The cost of different MOFs usually varies between 0.1 and 5 US$/g depending on the synthesis routes.
{"title":"Versatility, Cost Analysis, and Scale-up in Fluoride and Arsenic Removal Using Metal-organic Framework-based Adsorbents","authors":"Linisha Biswal, J. Goodwill, C. Janiak, Somak Chatterjee","doi":"10.1080/15422119.2021.1956539","DOIUrl":"https://doi.org/10.1080/15422119.2021.1956539","url":null,"abstract":"ABSTRACT Fluoride and arsenic are hazardous inorganic contaminants due to associated health risks and relatively higher levels of occurrence in groundwater. Metal-organic frameworks, (MOFs) with their high surface area, versatile building blocks and numerous active sites, are a novel approach to fluoride and arsenic uptake. This review presents the different types of MOFs for fluoride and arsenic removal along with a study of dynamic breakthrough times and cost analysis. MOF performances are based on a variety of synthesis methods, notable among which solvothermal one is more described. However, all research works concluded that MOFs have poor yield compared to conventional adsorbents. But, their high adsorption capacity, tailored chemical structure and ionic uptake of fluoride and arsenic make them a more favorable option than many other adsorbents. The cost of different MOFs usually varies between 0.1 and 5 US$/g depending on the synthesis routes.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86780128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-01DOI: 10.1080/15422119.2021.1951757
M. E. González‐López, C. M. Laureano-Anzaldo, A. A. Pérez-Fonseca, M. Arellano, J. R. Robledo‐Ortíz
ABSTRACT The linearization of adsorption equations is controversial. The estimation of fitting parameters strongly depends on the linearization method, magnitude of experimental error, and data range. Although many studies contrast linear versions of these equations with their non-linear counterparts, linearization is preferred due to its simplicity since a line could be represented with fewer experimental points than a curve. An in-depth analysis was carried out to compare the accuracy of linear and non-linear models. Although different transformations linearize Langmuir isotherms, only one form yields reliable fitting parameters. Linear transformations could also lead to a statistical bias, favoring a model that does not represent the experimental behavior. Similar observations are discussed regarding the pseudo-second-order kinetic model. Linearization of Freundlich isotherms, pseudo-first-order kinetic models, and fixed-bed adsorption models through logarithms implies that attention must be taken on the logarithm limits by properly selecting the data range. Linearization also promotes the incorrect interpretation of models due to oversimplification. The linearized van’t Hoff equation would yield a reasonable fit with fewer experimental points than the non-linear regression, which requires more data to assure convergence. In this sense, there is convincing evidence that non-linear regression is a more robust and reliable tool for adsorption modeling.
{"title":"A Critical Overview of Adsorption Models Linearization: Methodological and Statistical Inconsistencies","authors":"M. E. González‐López, C. M. Laureano-Anzaldo, A. A. Pérez-Fonseca, M. Arellano, J. R. Robledo‐Ortíz","doi":"10.1080/15422119.2021.1951757","DOIUrl":"https://doi.org/10.1080/15422119.2021.1951757","url":null,"abstract":"ABSTRACT The linearization of adsorption equations is controversial. The estimation of fitting parameters strongly depends on the linearization method, magnitude of experimental error, and data range. Although many studies contrast linear versions of these equations with their non-linear counterparts, linearization is preferred due to its simplicity since a line could be represented with fewer experimental points than a curve. An in-depth analysis was carried out to compare the accuracy of linear and non-linear models. Although different transformations linearize Langmuir isotherms, only one form yields reliable fitting parameters. Linear transformations could also lead to a statistical bias, favoring a model that does not represent the experimental behavior. Similar observations are discussed regarding the pseudo-second-order kinetic model. Linearization of Freundlich isotherms, pseudo-first-order kinetic models, and fixed-bed adsorption models through logarithms implies that attention must be taken on the logarithm limits by properly selecting the data range. Linearization also promotes the incorrect interpretation of models due to oversimplification. The linearized van’t Hoff equation would yield a reasonable fit with fewer experimental points than the non-linear regression, which requires more data to assure convergence. In this sense, there is convincing evidence that non-linear regression is a more robust and reliable tool for adsorption modeling.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89101480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-01DOI: 10.1080/15422119.2021.1920428
M. Zunita, R. Hastuti, A. Alamsyah, K. Khoiruddin, I. Wenten
ABSTRACT Carbon dioxide capture from industrial gases (i.e., flue gases and natural gas) is a crucial process for reducing the environmental impacts of acid gas emissions. However, carbon dioxide capture that is generally performed by amine-based solvent faces operational problems due to the properties of the solvent. Recently, ionic liquids (ILs) have emerged as promising candidates for replacing the amine-based solvent due to their low vapor pressure (near-zero), high stability, as well as tunable structure and properties. The functionalized ILs are considered superior in terms of their ease of regeneration as well as high absorption capacity and selectivity toward CO2. Combining the functionalized ILs with membrane processes has opened up a new horizon in CO2 capture technology. This review comprehensively summarizes the latest developments in the application of ionic liquid membranes (ILMs) for CO2 capture, including supported ILMs (SILMs), poly-ILMs (PILMs), polymer-IL composite membranes, mixed-matrix-membranes, with special attention to ILM contactors. The absorption mechanisms of CO2 in the ILs are pictured and discussed.
{"title":"Ionic Liquid Membrane for Carbon Capture and Separation","authors":"M. Zunita, R. Hastuti, A. Alamsyah, K. Khoiruddin, I. Wenten","doi":"10.1080/15422119.2021.1920428","DOIUrl":"https://doi.org/10.1080/15422119.2021.1920428","url":null,"abstract":"ABSTRACT Carbon dioxide capture from industrial gases (i.e., flue gases and natural gas) is a crucial process for reducing the environmental impacts of acid gas emissions. However, carbon dioxide capture that is generally performed by amine-based solvent faces operational problems due to the properties of the solvent. Recently, ionic liquids (ILs) have emerged as promising candidates for replacing the amine-based solvent due to their low vapor pressure (near-zero), high stability, as well as tunable structure and properties. The functionalized ILs are considered superior in terms of their ease of regeneration as well as high absorption capacity and selectivity toward CO2. Combining the functionalized ILs with membrane processes has opened up a new horizon in CO2 capture technology. This review comprehensively summarizes the latest developments in the application of ionic liquid membranes (ILMs) for CO2 capture, including supported ILMs (SILMs), poly-ILMs (PILMs), polymer-IL composite membranes, mixed-matrix-membranes, with special attention to ILM contactors. The absorption mechanisms of CO2 in the ILs are pictured and discussed.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85709911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-01DOI: 10.1080/15422119.2021.1954950
D. Sanyal, Purvi Mathur
ABSTRACT Estimation of antibiotic residues in environmental matrices; veterinary products; food and biological samples has become very important in order to protect the human health and limit the spread of antimicrobial resistance. To achieve this, sensitive and efficient sample preparation procedures for the extraction of antibiotics from complex matrices are essential. Reproducible and effective sample preparation processes together with sensitive analytical techniques directly impact the final accuracy of the data and further interpretation. Exhaustive solvent-based extraction techniques such as liquid–liquid extraction have several limitations and suffer from a negative impact on environment. Past two decades have witnessed paradigm shift from solvent based to sorbent-based techniques in the extraction of contaminants. Innovative non-exhaustive techniques such as solid-phase microextraction and magnetic solid-phase extraction using advanced (nano)materials (e.g. molecularly imprinted polymer) have brought radical changes to the way traditional sample extraction was carried out. As the advanced techniques are specific to a target antibiotic or to its class, design consideration for the in-house synthesis of novel (nano)materials and optimization of the extraction technique is a crucial step in the quantification of antibiotic contaminants. The aim of this review is to assess the critical design parameters to be considered to synthesize novel sorbent materials for the extraction of antibiotics and to improve their extraction techniques.
{"title":"Advanced Adsorbent Mediated Extraction Techniques for the Separation of Antibiotics from Food, Biological, and Environmental Matrices","authors":"D. Sanyal, Purvi Mathur","doi":"10.1080/15422119.2021.1954950","DOIUrl":"https://doi.org/10.1080/15422119.2021.1954950","url":null,"abstract":"ABSTRACT Estimation of antibiotic residues in environmental matrices; veterinary products; food and biological samples has become very important in order to protect the human health and limit the spread of antimicrobial resistance. To achieve this, sensitive and efficient sample preparation procedures for the extraction of antibiotics from complex matrices are essential. Reproducible and effective sample preparation processes together with sensitive analytical techniques directly impact the final accuracy of the data and further interpretation. Exhaustive solvent-based extraction techniques such as liquid–liquid extraction have several limitations and suffer from a negative impact on environment. Past two decades have witnessed paradigm shift from solvent based to sorbent-based techniques in the extraction of contaminants. Innovative non-exhaustive techniques such as solid-phase microextraction and magnetic solid-phase extraction using advanced (nano)materials (e.g. molecularly imprinted polymer) have brought radical changes to the way traditional sample extraction was carried out. As the advanced techniques are specific to a target antibiotic or to its class, design consideration for the in-house synthesis of novel (nano)materials and optimization of the extraction technique is a crucial step in the quantification of antibiotic contaminants. The aim of this review is to assess the critical design parameters to be considered to synthesize novel sorbent materials for the extraction of antibiotics and to improve their extraction techniques.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86428357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-15DOI: 10.1080/15422119.2021.1948865
Angelo Beratto-Ramos, Jorge Dagnino-Leone, J. Martínez-Oyanedel, Mario Aranda, R. Bórquez
ABSTRACT Desalination is considered one of the strongest alternatives to face global water scarcity. Since conventional reverse osmosis is an energy-intensive process, Aquaporin biomimetic membranes (ABM) emerge as an effective alternative to increase productivity and reduce energy consumption. Despite the highly theoretical water permeability and selectivity of aquaporins (Aqps), in practice, ABM did not achieve the expected performance. This review is focused on each step of the ABM fabrication process in order to find critical points where efforts should be made for future studies. Fabrication procedures include Aqp production, reconstitution into vesicles, immobilization in porous substrates and filtration performance. The principal identified challenge is the need for implementing monitoring and optimization techniques. Also, new strategies for protein production, stabilization, reconstitution, and support affinity could offer significant breakthroughs for developing ABMs as a viable emerging technology.
{"title":"Fabrication and Filtration Performance of Aquaporin Biomimetic Membranes for Water Treatment","authors":"Angelo Beratto-Ramos, Jorge Dagnino-Leone, J. Martínez-Oyanedel, Mario Aranda, R. Bórquez","doi":"10.1080/15422119.2021.1948865","DOIUrl":"https://doi.org/10.1080/15422119.2021.1948865","url":null,"abstract":"ABSTRACT Desalination is considered one of the strongest alternatives to face global water scarcity. Since conventional reverse osmosis is an energy-intensive process, Aquaporin biomimetic membranes (ABM) emerge as an effective alternative to increase productivity and reduce energy consumption. Despite the highly theoretical water permeability and selectivity of aquaporins (Aqps), in practice, ABM did not achieve the expected performance. This review is focused on each step of the ABM fabrication process in order to find critical points where efforts should be made for future studies. Fabrication procedures include Aqp production, reconstitution into vesicles, immobilization in porous substrates and filtration performance. The principal identified challenge is the need for implementing monitoring and optimization techniques. Also, new strategies for protein production, stabilization, reconstitution, and support affinity could offer significant breakthroughs for developing ABMs as a viable emerging technology.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73626532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-03DOI: 10.1080/15422119.2020.1725048
S. Remanan, N. Padmavathy, Sabyasachi Ghosh, Subhadip Mondal, S. Bose, N. Das
ABSTRACT Fabrication of nanoporous membranes from two-dimensional nanomaterial has recently gained increased research interest because of their flexibility, freestanding film formability, selectivity, and ability to withstand the applied transmembrane pressure. Among various 2D materials, graphene and its derivatives are widely employed for the preparation of next-generation membranes due to their excellent separation properties with inherent qualities like atomic thickness, good tensile strength, and frictionless surface for real-time applications. This review discusses the recent progress in three types of porous graphene-based materials, which are holey graphene, graphene nanomesh and graphene oxide laminates, and their applicability for membrane separations. This review aims to summarize the preparation and properties of these membranes for water purification application. The various factors which influence the separation efficiency of the graphene-derived membranes such as mechanical stability, effect of surface architecture, effect of interlayer spacing, and various crosslinking strategies are also discussed.
{"title":"Porous Graphene-based Membranes: Preparation and Properties of a Unique Two-dimensional Nanomaterial Membrane for Water Purification","authors":"S. Remanan, N. Padmavathy, Sabyasachi Ghosh, Subhadip Mondal, S. Bose, N. Das","doi":"10.1080/15422119.2020.1725048","DOIUrl":"https://doi.org/10.1080/15422119.2020.1725048","url":null,"abstract":"ABSTRACT Fabrication of nanoporous membranes from two-dimensional nanomaterial has recently gained increased research interest because of their flexibility, freestanding film formability, selectivity, and ability to withstand the applied transmembrane pressure. Among various 2D materials, graphene and its derivatives are widely employed for the preparation of next-generation membranes due to their excellent separation properties with inherent qualities like atomic thickness, good tensile strength, and frictionless surface for real-time applications. This review discusses the recent progress in three types of porous graphene-based materials, which are holey graphene, graphene nanomesh and graphene oxide laminates, and their applicability for membrane separations. This review aims to summarize the preparation and properties of these membranes for water purification application. The various factors which influence the separation efficiency of the graphene-derived membranes such as mechanical stability, effect of surface architecture, effect of interlayer spacing, and various crosslinking strategies are also discussed.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85746668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-01DOI: 10.1080/15422119.2021.1922444
Qili Hu, Shuyue Pang, Dan Wang
ABSTRACT The kinetic models were widely used to analyze the dynamic adsorption behaviors in a batch system and reveal the mass-transfer mechanisms. The previous review papers were mainly confined to the description of the kinetic models, assessment of the fitting quality, determination of the model parameters and practical application in the field of water and wastewater treatment. However, the curve characteristics of the kinetic models and their mathematical relations were rarely mentioned in the literature. How to select and determine the optimum model remained to be further discussed. Thus, in addition to improving previous work, the main objectives of this review were: (i) to identify the curve characteristics of the kinetic models by control variates; (ii) to reveal their mathematical relations by variable substitution; (iii) to determine the optimum model by error functions and residual plot; and (iv) to correct some common mistakes in the literature. The pseudo-first-order (PFO) and pseudo-second-order (PSO) equations were two special cases of mixed 1,2-order equation (MOE). The PFO and Furusawa–Smith equations were mathematically equivalent. This review is expected to help readers better understand and use the adsorption kinetic models and provide potential ideas for the development of new kinetic models.
{"title":"In-depth Insights into Mathematical Characteristics, Selection Criteria and Common Mistakes of Adsorption Kinetic Models: A Critical Review","authors":"Qili Hu, Shuyue Pang, Dan Wang","doi":"10.1080/15422119.2021.1922444","DOIUrl":"https://doi.org/10.1080/15422119.2021.1922444","url":null,"abstract":"ABSTRACT The kinetic models were widely used to analyze the dynamic adsorption behaviors in a batch system and reveal the mass-transfer mechanisms. The previous review papers were mainly confined to the description of the kinetic models, assessment of the fitting quality, determination of the model parameters and practical application in the field of water and wastewater treatment. However, the curve characteristics of the kinetic models and their mathematical relations were rarely mentioned in the literature. How to select and determine the optimum model remained to be further discussed. Thus, in addition to improving previous work, the main objectives of this review were: (i) to identify the curve characteristics of the kinetic models by control variates; (ii) to reveal their mathematical relations by variable substitution; (iii) to determine the optimum model by error functions and residual plot; and (iv) to correct some common mistakes in the literature. The pseudo-first-order (PFO) and pseudo-second-order (PSO) equations were two special cases of mixed 1,2-order equation (MOE). The PFO and Furusawa–Smith equations were mathematically equivalent. This review is expected to help readers better understand and use the adsorption kinetic models and provide potential ideas for the development of new kinetic models.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79596353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-27DOI: 10.1080/15422119.2021.1944209
Jie Zhang, Xiaoqing Li, Pu Ge, Bo Zhang, L. Wen, Changhong Gu, Xing-yu Zhou
ABSTRACT Sulforaphene (SRP) is the main isothiocyanate produced by myrosinase hydrolysis of glucoraphanin from Cruciferae plants. This review discusses the latest results on the formation, content, and stability of SRP. SRP is unstable when the solution system contains amino-acids or solvents with hydroxyl groups. Different strategies to inhibit the SRP degradation and increase the hydrolysis yield have been discussed in detail. The separation, purification and SRP determination methods are described in the review. SRP has herbicidal, antimicrobial, antimutagenic, and metabolic activities, and especially an anticancer activity. These findings indicate that SRP can be considered as a prospective therapeutic agent for major human diseases. However, for possible medicinal SRP applications, there is an urgent demand for development of new strategies for purification methods and chemical synthesis maintaining SRP stability. In addition the precise mechanism of action of SRP should be thoroughly clarified.
{"title":"Sulforaphene: Formation, Stability, Separation, Purification, Determination and Biological Activities","authors":"Jie Zhang, Xiaoqing Li, Pu Ge, Bo Zhang, L. Wen, Changhong Gu, Xing-yu Zhou","doi":"10.1080/15422119.2021.1944209","DOIUrl":"https://doi.org/10.1080/15422119.2021.1944209","url":null,"abstract":"ABSTRACT Sulforaphene (SRP) is the main isothiocyanate produced by myrosinase hydrolysis of glucoraphanin from Cruciferae plants. This review discusses the latest results on the formation, content, and stability of SRP. SRP is unstable when the solution system contains amino-acids or solvents with hydroxyl groups. Different strategies to inhibit the SRP degradation and increase the hydrolysis yield have been discussed in detail. The separation, purification and SRP determination methods are described in the review. SRP has herbicidal, antimicrobial, antimutagenic, and metabolic activities, and especially an anticancer activity. These findings indicate that SRP can be considered as a prospective therapeutic agent for major human diseases. However, for possible medicinal SRP applications, there is an urgent demand for development of new strategies for purification methods and chemical synthesis maintaining SRP stability. In addition the precise mechanism of action of SRP should be thoroughly clarified.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81618201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-18DOI: 10.1080/15422119.2021.1934699
Yimin Deng, J. Seville, S. D. Bell, A. Ingram, Huili Zhang, Nick Sweygers, R. Dewil, J. Baeyens, L. Appels
ABSTRACT Gas adsorption is widely used in air pollution control, with mainly activated carbon and zeolites used as adsorbents. Although physical and chemisorption can be used, most air pollution applications involve physical adsorption, now also increasingly investigated for CO2 abatement from combustion gas. Empirical adsorption treatments have been presented since many decades, but solely rely on the comparison of adsorbate feed and exhaust concentrations of the adsorption bed. In-situ measurements, to study the absorbate/adsorbent interactions in real time, are compared in the present review when performed by a three-dimensional (3D) Positron Emission Tomography of an adsorbing 11CO2 radioactive tracer on activated carbon versus a zeolite adsorbent. The overall results are validated by conventional exit gas analysis. Results are defining both the time-dependent adsorption parameters, such as the progressing adsorption front and Mass Transfer Zone along the adsorbent bed length, and enable to assess previous semi-empirical adsorption correlations toward their optimum validity in predicting adsorption isotherms, kinetics and mechanisms.
{"title":"Reviewing Fundamental CO2 Adsorption Characteristics of Zeolite and Activated Carbon by In-situ Measurements With Radioactively Labelled CO2","authors":"Yimin Deng, J. Seville, S. D. Bell, A. Ingram, Huili Zhang, Nick Sweygers, R. Dewil, J. Baeyens, L. Appels","doi":"10.1080/15422119.2021.1934699","DOIUrl":"https://doi.org/10.1080/15422119.2021.1934699","url":null,"abstract":"ABSTRACT Gas adsorption is widely used in air pollution control, with mainly activated carbon and zeolites used as adsorbents. Although physical and chemisorption can be used, most air pollution applications involve physical adsorption, now also increasingly investigated for CO2 abatement from combustion gas. Empirical adsorption treatments have been presented since many decades, but solely rely on the comparison of adsorbate feed and exhaust concentrations of the adsorption bed. In-situ measurements, to study the absorbate/adsorbent interactions in real time, are compared in the present review when performed by a three-dimensional (3D) Positron Emission Tomography of an adsorbing 11CO2 radioactive tracer on activated carbon versus a zeolite adsorbent. The overall results are validated by conventional exit gas analysis. Results are defining both the time-dependent adsorption parameters, such as the progressing adsorption front and Mass Transfer Zone along the adsorbent bed length, and enable to assess previous semi-empirical adsorption correlations toward their optimum validity in predicting adsorption isotherms, kinetics and mechanisms.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81308049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-13DOI: 10.1080/15422119.2021.1924205
Engy A. Mahrous, M. Farag
ABSTRACT Introduction Molecular distillation (MD) is a physical separation method that was developed for several applications in petrochemical, food, cosmetics and pharmaceutical industries. Early industrial applications were most prominent in the petrochemical industry and in the food industry for vegetable oil refinement. During the past two decades, MD has gained a renewed attention and its applications have expanded to include purification and enrichment of bioactive compounds from natural product extracts and in nutraceuticals production. Objectives This review highlights, from a chemical perispective, applications and potential future MD development in the fields of pharmaceutics and natural product chemistry. Literature review A brief summary to outline the MD concept and the factors to be considered in designing efficient MD experiments is provided. Recent MD applications in the production and refinement of raw materials to be used in the pharmaceutical, cosmetics and nutraceutical industries are analyzed. This review further discusses future development in MD to expand its appliaction for refinement and purification of fixed oils, essential oils and plant extracts.
{"title":"Trends and Applications of Molecular Distillation in Pharmaceutical and Food Industries","authors":"Engy A. Mahrous, M. Farag","doi":"10.1080/15422119.2021.1924205","DOIUrl":"https://doi.org/10.1080/15422119.2021.1924205","url":null,"abstract":"ABSTRACT Introduction Molecular distillation (MD) is a physical separation method that was developed for several applications in petrochemical, food, cosmetics and pharmaceutical industries. Early industrial applications were most prominent in the petrochemical industry and in the food industry for vegetable oil refinement. During the past two decades, MD has gained a renewed attention and its applications have expanded to include purification and enrichment of bioactive compounds from natural product extracts and in nutraceuticals production. Objectives This review highlights, from a chemical perispective, applications and potential future MD development in the fields of pharmaceutics and natural product chemistry. Literature review A brief summary to outline the MD concept and the factors to be considered in designing efficient MD experiments is provided. Recent MD applications in the production and refinement of raw materials to be used in the pharmaceutical, cosmetics and nutraceutical industries are analyzed. This review further discusses future development in MD to expand its appliaction for refinement and purification of fixed oils, essential oils and plant extracts.","PeriodicalId":21744,"journal":{"name":"Separation & Purification Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85823901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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