Clay Minerals最新文献_第10页

Enhanced thermal stability and adsorption performance of MIL-53(Fe)@montmorillonite 增强了MIL-53(Fe)@蒙脱土的热稳定性和吸附性能

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-06-01 DOI: 10.1180/clm.2021.23

Fenglin Dai, Junhui Guo, Yufeng He, Pengfei Song, Rongmin Wang

{"title":"Enhanced thermal stability and adsorption performance of MIL-53(Fe)@montmorillonite","authors":"Fenglin Dai, Junhui Guo, Yufeng He, Pengfei Song, Rongmin Wang","doi":"10.1180/clm.2021.23","DOIUrl":"https://doi.org/10.1180/clm.2021.23","url":null,"abstract":"Abstract Montmorillonite (Mnt), a clay mineral with a nanolayered structure, was combined with an Fe-based metal–organic framework (MOF; MIL-53(Fe)) using an in situ growth technique that yielded a novel eco-friendly clay-based adsorbent (MIL-53(Fe)@Mnt). The adsorbent was characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis and N2 gas adsorption. The MIL-53(Fe) particles grew on the surface of the nanolayered Mnt and the MIL-53(Fe) particle size became smaller. The adsorption performance of MIL-53(Fe)@Mnt was investigated by removing methylene blue (MB), and optimization experiments were carried out to study the effects of contact time, pH, initial dye concentration and adsorbent mass on the adsorption processes. The MIL-53(Fe)@Mnt exhibited excellent adsorption capacity for MB, namely 313.7 mg g−1, which was 3.02 times and 3.54 times greater than that of pure Mnt and MIL-53(Fe), respectively. Adsorption was fitted with the Langmuir isotherm model and followed a pseudo-second order kinetic model. The MIL-53(Fe)@Mnt obtained is a low-cost and eco-friendly adsorbing material and might be a candidate for removing dyes during water treatment.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"56 1","pages":"99 - 107"},"PeriodicalIF":1.5,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45195876","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}

引用次数: 4

CLM volume 56 issue 2 Cover and Back matter CLM第56卷第2期封面和封底

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-06-01 DOI: 10.1180/clm.2021.34

引用次数: 0

Kaolinite-armoured polyurea microcapsules fabricated on Pickering emulsion: controllable encapsulation and release performance of a lipophilic compound — ERRATUM 皮克林乳液制备的高岭石包覆聚脲微胶囊:一种亲脂化合物的可控包封和释放性能

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-06-01 DOI: 10.1180/clm.2021.21

Cunjun Li, Minghao Wang, Zhaoliang Liu, Yanqi Xu, Chunhui Zhou, Linjiang Wang

引用次数: 0

Investigation of unexplored kaolin occurrences in southern Mauritania and preliminary assessment of possible applications 毛里塔尼亚南部未勘探高岭土矿点的调查和可能应用的初步评估

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-06-01 DOI: 10.1180/clm.2021.26

D. Küster, S. Kaufhold, Emanetoullah Limam, Omar Jatlaoui, Oumar Ba, Abdellahi Maham Zein Mohamed, M. Pohlmann-Lortz, M. Ranneberg, K. Ufer

{"title":"Investigation of unexplored kaolin occurrences in southern Mauritania and preliminary assessment of possible applications","authors":"D. Küster, S. Kaufhold, Emanetoullah Limam, Omar Jatlaoui, Oumar Ba, Abdellahi Maham Zein Mohamed, M. Pohlmann-Lortz, M. Ranneberg, K. Ufer","doi":"10.1180/clm.2021.26","DOIUrl":"https://doi.org/10.1180/clm.2021.26","url":null,"abstract":"Abstract Non-metallic raw materials are largely unexplored in many African countries. In an attempt to reduce this knowledge gap, kaolin occurrences in three promising regions of southern Mauritania were examined. The aim of the paper is to describe the occurrences and characterize the material in terms of mineralogy and potential technical use in the ceramics industry. The kaolins are geologically associated with various sedimentary rock units in either the Coastal Basin (Kaédi), the Mauritanide Belt (Hassi Abyad) or the Taoudeni Basin (Néma). Geochemical data show Al2O3 contents of between 9% and 38% (corresponding to 23–96% kaolinite). Samples from the Hassi Abyad and Kaédi regions have greater kaolinite contents on average and were further investigated mineralogically. The kaolin from the Néma region contained less kaolinite (<50 mass%). The region is also less accessible and hence is not considered further in this study. X-ray diffraction, X-ray fluorescence and infrared spectroscopy confirmed the geochemically calculated kaolinite contents of the kaolins and identified quartz, anatase and goethite as the remaining major mineral constituents. The degree of structural disorder of the kaolinites (determined by infrared spectroscopy) is generally greater in the Kaédi occurrences than at Hassi Abyad. Ceramic tests proved that all of these kaolin raw materials might be used for the production of ceramics, and some may even be used for fine ceramics. From an economic point of view, the Hassi Abyad deposit is interesting in terms of its quality and reserves, aspects that will be addressed in detail in a follow-up study.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"56 1","pages":"126 - 139"},"PeriodicalIF":1.5,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45647277","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}

引用次数: 1

Synthesis and optimization of a montmorillonite-tolerant zwitterionic polycarboxylate superplasticizer via Box-Behnken design Box-Behnken设计合成耐蒙脱石两性离子聚羧酸酯高效减水剂及优化研究

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-06-01 DOI: 10.1180/clm.2021.25

Jun Ren, Shuqiong Luo, S. Shi, H. Tan, Xianfeng Wang, Min Liu, Xiang-guo Li

引用次数: 4

Characterization of Brazilian palygorskite (Guadalupe region) and adsorptive behaviour for solvatochromic dyes 巴西斜长石(瓜达卢佩地区)的表征及其对溶剂变色染料的吸附行为

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-04-28 DOI: 10.1180/CLM.2021.16

C. D. de Souza, Tammy Caroline Lima de Jesus, Rafael C. dos Santos, Lívia Melo Bomfim, L. Bertolino, Débora F. de Andrade, L. A. d´Avila, L. Spinelli

{"title":"Characterization of Brazilian palygorskite (Guadalupe region) and adsorptive behaviour for solvatochromic dyes","authors":"C. D. de Souza, Tammy Caroline Lima de Jesus, Rafael C. dos Santos, Lívia Melo Bomfim, L. Bertolino, Débora F. de Andrade, L. A. d´Avila, L. Spinelli","doi":"10.1180/CLM.2021.16","DOIUrl":"https://doi.org/10.1180/CLM.2021.16","url":null,"abstract":"This work presents the results of the physical characterization of palygorskite and its adsorptive behaviour for three solvatochromic dyes (Nile blue chloride (NBC), methylene blue (MTB) and dithizone (DTZ)). Adsorption isotherms were used to determine the maximum adsorption of the solvatochromic dyes on the palygorskite. The characterization of palygorskite was carried out via mineralogical and chemical analysis with X-ray diffraction, X-ray fluorescence, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy, surface-charge measurement (ζ-potential), thermogravimetric analysis, textural analysis and cation-exchange capacity analysis. The material consists of palygorskite and quartz and its chemistry is dominated by SiO2, MgO and Fe2O3. The specific surface area and cation-exchange capacity of the palygorskite are 142 m2 g–1 and 41 cmol(+) kg–1, respectively. The SEM and TEM analyses showed a fibrous structure with fibres 20–100 nm long. The thermogravimetric analysis showed three endothermic events at 57.3°C, 171.8°C and 439.6°C. The adsorption capacities of the palygorskite for NBC (basic pH), MTB (basic pH) and DTZ (neutral pH) were 0.082, 0.013 and 0.102 g g–1, respectively. The adsorptions of NBC and MTB were fitted with the Langmuir isotherm model and the adsorption of DTZ was fitted with the Sips model.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"1 1","pages":"1-33"},"PeriodicalIF":1.5,"publicationDate":"2021-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47480274","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}

引用次数: 3

Peter Komadel, 1955–2021 彼得·科马德尔，1955–2021

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-04-20 DOI: 10.1180/CLM.2021.11

J. Stucki, J. Madejová

引用次数: 0

Kaolinite-armoured polyurea microcapsules fabricated on Pickering emulsion: controllable encapsulation and release performance of a lipophilic compound 皮克林乳液制备高岭石包覆聚脲微胶囊:一种亲脂化合物的可控包封和释放性能

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-04-16 DOI: 10.1180/CLM.2021.15

Cunjun Li, Minghao Wang, Zhaoliang Liu, Yanqi Xu, C. Zhou, Linjiang Wang

{"title":"Kaolinite-armoured polyurea microcapsules fabricated on Pickering emulsion: controllable encapsulation and release performance of a lipophilic compound","authors":"Cunjun Li, Minghao Wang, Zhaoliang Liu, Yanqi Xu, C. Zhou, Linjiang Wang","doi":"10.1180/CLM.2021.15","DOIUrl":"https://doi.org/10.1180/CLM.2021.15","url":null,"abstract":"Microcapsules are successfully used in various applications such as self-healing, drug delivery and military camouflage. The shells of the microcapsules based on the traditional surfactant-stabilized emulsion template method are often single organic materials. The surfactants generally have insufficient stability against demulsification during preparation of the microcapsules. In the present study, kaolinite was used as an emulsifier for stabilizing Pickering emulsions and subsequently as an enhancer for forming microcapsules. Kaolinite-armoured polyurea microcapsules were fabricated based on the interfacial polymerization of isophorone diisocyanate at the oil–water interfaces of kaolinite-stabilized Pickering emulsions. The prepared microcapsules with core–shell structure were spherical and exhibited good dispersibility in anhydrous ethanol. The shell thickness (~0.5–1.0 μm) and diameter (~20.0–160.0 μm) of kaolinite-armoured polyurea microcapsules may be tailored by varying the dosages of isophorone diisocyanate and kaolinite and the emulsifying speed of the high-shear homogenizer. Hence, the encapsulation and release performance of microcapsules may be controlled. The kaolinite particles were embedded and armoured in a polyurea matrix. The formed kaolinite-embedded and -armoured polyurea structures might prolong the release of the encapsulated lipophilic Sudan Red (III) from 20 to 45 h. The microcapsules have controllable encapsulation and release characteristics for lipophilic compounds and are cost effective, making them suitable pesticides.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"1 1","pages":"1-30"},"PeriodicalIF":1.5,"publicationDate":"2021-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42665772","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}

引用次数: 2

Mineralogy and chemistry of a new halloysite deposit from the Rio de Janeiro pegmatite province, south-eastern Brazil 巴西东南部里约热内卢de Janeiro伟晶岩省新高岭土矿床的矿物学和化学

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-03-08 DOI: 10.1180/CLM.2021.8

V. M. J. Salgado-Campos, L. Bertolino, Francisco J. da Silva, J. Mendes, R. Neumann

{"title":"Mineralogy and chemistry of a new halloysite deposit from the Rio de Janeiro pegmatite province, south-eastern Brazil","authors":"V. M. J. Salgado-Campos, L. Bertolino, Francisco J. da Silva, J. Mendes, R. Neumann","doi":"10.1180/CLM.2021.8","DOIUrl":"https://doi.org/10.1180/CLM.2021.8","url":null,"abstract":"Halloysite is a 1:1 dioctahedral clay mineral that has been studied widely for applications in nanotechnology and as a mineral exploration guide for recognizing regolith-hosted heavy rare earth element (HREE) deposits. In Brazil, pegmatites from the state of Rio de Janeiro have been catalogued, but their potential to host halloysite deposits has never been studied. After a mineral exploration programme, one pegmatite with considerable halloysite contents and economic potential was discovered. This study reports the mineralogical and chemical characterization of the halloysite of this pegmatite and evaluates the possibility of clay-adsorbed HREE deposits, like that in the Zudong (China) regolith-hosted HREE deposit. Seven samples were collected in horizontal channels. Bulk samples and clay fractions (<2 μm) were analysed by quantitative mineral analysis (X-ray diffraction/Rietveld method), chemical analysis (major elements by X-ray fluorescence and Y, U, Th and rare earth elements by inductively coupled plasma mass spectrometry), scanning electron microscopy, Fourier-transform infrared spectroscopy, particle-size analysis, nitrogen physisorption and cation-exchange capacity. Mixed polygonal/cylindrical halloysite-7Å in concentrations between 6.3 and 35.4 wt.% in bulk samples and between 58.0 and 89.8 wt.% in the clay fractions were identified in the pegmatite. The clay fractions presented an average chemical composition of 45.46 wt.% SiO2, 36.10 wt.% Al2O3, 14.62 wt.% loss on ignition and 1.04 wt.% Fe2O3, as well as technological properties close to those observed in world-class halloysite deposits such as Dragon Mine (USA) and Matauri Bay (New Zealand). The clay minerals did not present significant HREE contents.","PeriodicalId":10311,"journal":{"name":"Clay Minerals","volume":"1 1","pages":"1-15"},"PeriodicalIF":1.5,"publicationDate":"2021-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"65514668","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}

引用次数: 0

Effects of grinding and dehydration on kaolin in a steam jet mill 蒸汽射流磨粉脱水对高岭土的影响

IF 1.5 4区地球科学

Clay Minerals Pub Date : 2021-03-01 DOI: 10.1180/CLM.2021.18

Zhe Wang, Hong Li, Haiyan Chen, Juan Lv, Hao Leng, Junhui Xiao, Shuai Wang

引用次数: 2