Pub Date : 2023-10-19DOI: 10.1007/s42860-023-00254-4
Jebril Hadi, Jean-Marc Greneche, Paul Wersin, Petri Koho, Barbara Pastina
Abstract Geologic repositories for spent nuclear fuel use bentonite as a buffer to protect the metallic containers confining the radioactive material. Sulfate-reducing bacteria, which may be present in groundwater, at the bentonite–host rock interface or eventually within the bentonite may produce sulfide, representing a potential threat for the metallic canisters, particularly copper. Bentonites can act as potential sulfide scavengers. Little is yet known, however, regarding the underlying mechanisms, the maximum extent of sulfide consumption, and the potential impacts on bentonite structure under repository conditions. In the current study, concentrated (4–150 mM) sulfide solutions were reacted in batch experiments with six natural Fe-bearing bentonites, with various purified Fe-bearing components of bentonite (a series of purified montmorillonites and three iron (oxyhydr)oxides), and with one synthetic mixture, for up to 1.5 months at pH values ranging from 7 to 13. The solutions were analyzed by colorimetry to determine sulfide and polysulfide concentrations and the solids were analyzed by 57 Fe Mössbauer spectrometry to determine iron speciation. Important sulfide consumption coupled with a reduction of structural Fe in the clay samples was observed. Not all clay structural Fe was reactive toward sulfide; the proportion of active structural Fe depended on the clay structure and pH. In the presence of excess sulfide in solution regarding Fe in the solid sample, the clay structural Fe was found to be the main reactant while the reaction with iron (oxyhydr)oxides was largely inhibited. Three bentonite groups were distinguished, based on the sulfide oxidation capacity of their main clayey component.
用过的核燃料的地质储存库使用膨润土作为缓冲，以保护限制放射性物质的金属容器。地下水中可能存在的硫酸盐还原细菌，在膨润土-寄主岩石界面或最终在膨润土内部可能产生硫化物，这对金属罐，特别是铜罐构成潜在威胁。膨润土可以作为潜在的硫化物清除剂。然而，对于潜在的机制、硫化物消耗的最大程度以及储存库条件下对膨润土结构的潜在影响，人们知之甚少。在目前的研究中，浓缩(4-150 mM)硫化物溶液与六种天然含铁膨润土、各种纯化的膨润土含铁成分(一系列纯化的蒙脱土和三种铁(氧)氧化物)以及一种合成混合物在pH值7至13范围内反应长达1.5个月。溶液采用比色法测定硫化物和多硫化物浓度，固体采用57 Fe Mössbauer光谱法测定铁形态。在粘土样品中观察到重要的硫化物消耗与结构铁的减少。并不是所有的粘土结构铁都与硫化物发生反应;活性结构铁的比例与粘土结构和ph值有关。固体样品中铁在溶液中存在过量硫化物时，粘土结构铁是主要的反应物，而与铁(氧)氧化物的反应在很大程度上被抑制。根据膨润土主要粘土组分的硫化物氧化能力，区分了3个膨润土基团。
{"title":"Determination of Sulfide Consumption by Fe-bearing Components of Bentonites","authors":"Jebril Hadi, Jean-Marc Greneche, Paul Wersin, Petri Koho, Barbara Pastina","doi":"10.1007/s42860-023-00254-4","DOIUrl":"https://doi.org/10.1007/s42860-023-00254-4","url":null,"abstract":"Abstract Geologic repositories for spent nuclear fuel use bentonite as a buffer to protect the metallic containers confining the radioactive material. Sulfate-reducing bacteria, which may be present in groundwater, at the bentonite–host rock interface or eventually within the bentonite may produce sulfide, representing a potential threat for the metallic canisters, particularly copper. Bentonites can act as potential sulfide scavengers. Little is yet known, however, regarding the underlying mechanisms, the maximum extent of sulfide consumption, and the potential impacts on bentonite structure under repository conditions. In the current study, concentrated (4–150 mM) sulfide solutions were reacted in batch experiments with six natural Fe-bearing bentonites, with various purified Fe-bearing components of bentonite (a series of purified montmorillonites and three iron (oxyhydr)oxides), and with one synthetic mixture, for up to 1.5 months at pH values ranging from 7 to 13. The solutions were analyzed by colorimetry to determine sulfide and polysulfide concentrations and the solids were analyzed by 57 Fe Mössbauer spectrometry to determine iron speciation. Important sulfide consumption coupled with a reduction of structural Fe in the clay samples was observed. Not all clay structural Fe was reactive toward sulfide; the proportion of active structural Fe depended on the clay structure and pH. In the presence of excess sulfide in solution regarding Fe in the solid sample, the clay structural Fe was found to be the main reactant while the reaction with iron (oxyhydr)oxides was largely inhibited. Three bentonite groups were distinguished, based on the sulfide oxidation capacity of their main clayey component.","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135729039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-13DOI: 10.1007/s42860-023-00253-5
Chadha Mejri, Walid Oueslati, Abdesslem Ben Haj Amara
{"title":"From Coupling Second-Order Stresses to Understanding and Predicting the Structural Response of a Dioctahedral Smectite","authors":"Chadha Mejri, Walid Oueslati, Abdesslem Ben Haj Amara","doi":"10.1007/s42860-023-00253-5","DOIUrl":"https://doi.org/10.1007/s42860-023-00253-5","url":null,"abstract":"","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135918224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-11DOI: 10.1007/s42860-023-00255-3
I. Criouet, J. C. Viennet, F. Baron, E. Balan, A. Buch, L. Delbes, M. Guillaumet, L. Remusat, S. Bernard
{"title":"Influence of pH on the Hydrothermal Synthesis of Al-Substituted Smectites (Saponite, Beidellite, and Nontronite)","authors":"I. Criouet, J. C. Viennet, F. Baron, E. Balan, A. Buch, L. Delbes, M. Guillaumet, L. Remusat, S. Bernard","doi":"10.1007/s42860-023-00255-3","DOIUrl":"https://doi.org/10.1007/s42860-023-00255-3","url":null,"abstract":"","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136210742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-30DOI: 10.1007/s42860-023-00246-4
Alimpia Borah, A. Borah, Monti Gogoi, R. Goswami, S. Hazarika
{"title":"Organic Exfoliation of Hydrophilic Bentonite using Aliquat 336 and Isobutyl(Trimethoxy)Silane to Enhance its Activity Toward pH-Dependent Adsorption of Epigallocatechin Gallate","authors":"Alimpia Borah, A. Borah, Monti Gogoi, R. Goswami, S. Hazarika","doi":"10.1007/s42860-023-00246-4","DOIUrl":"https://doi.org/10.1007/s42860-023-00246-4","url":null,"abstract":"","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41867711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-11DOI: 10.1007/s42860-023-00248-2
Katharina R. Lenhardt, Mathias Stein, T. Rennert
{"title":"Silicon Incorporation Reduces the Reactivity of Short-range Ordered Aluminosilicates Toward Organic Acids","authors":"Katharina R. Lenhardt, Mathias Stein, T. Rennert","doi":"10.1007/s42860-023-00248-2","DOIUrl":"https://doi.org/10.1007/s42860-023-00248-2","url":null,"abstract":"","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44038438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-04DOI: 10.1007/s42860-023-00247-3
Elif Çam, Elif Uğurlu Sağın
{"title":"Characteristics and Production Technologies of Byzantine Building Bricks from the Anaia Church in Western Anatolia","authors":"Elif Çam, Elif Uğurlu Sağın","doi":"10.1007/s42860-023-00247-3","DOIUrl":"https://doi.org/10.1007/s42860-023-00247-3","url":null,"abstract":"","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43828779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.1007/s42860-023-00249-1
Hongxiao Qu, Tong Liu, Ruijue Hu, Hao Qu, Yichi Zhang, Hui Yang, Haiquan Su, Yue Su
{"title":"Delaminated and Pit-rich Nano-kaolinites obtained via an Intercalation-etching Method and their Application to Fischer–Tropsch Synthesis","authors":"Hongxiao Qu, Tong Liu, Ruijue Hu, Hao Qu, Yichi Zhang, Hui Yang, Haiquan Su, Yue Su","doi":"10.1007/s42860-023-00249-1","DOIUrl":"https://doi.org/10.1007/s42860-023-00249-1","url":null,"abstract":"","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48009169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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