Article
Environmental Sciences
Yong He, Guang Hu, Dong-yu Wu, Kao-fei Zhu, Ke-neng Zhang
Summary: Groundwater pollution, particularly from leachate leakage in landfills, has become more severe in recent years. A study analyzing the migration of Cu2} in landfills and the retention behavior of a compacted laterite-bentonite barrier system found that the hydraulic conductivity of the mixture decreased with an increase in bentonite ratio. Numerical simulations showed that the migration range of Cu2} was approximately 1500 m after 3650 days, with retention efficiency increasing with barrier thickness. These findings suggest that the engineered barrier system has a good retention effect on Cu2} and may provide effective concepts for preventing and controlling groundwater pollution in landfills.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Yongping Gao, Xiaojun Li
Summary: This study found that the addition of bentonite can significantly reduce the mobility of nickel and copper, thereby reducing the biological toxicity and mobility of heavy metals in polluted soil.
Article
Environmental Sciences
Qi He, Yong He, Hui-ping Hu, Wei Lou, Zhao Zhang, Ke-neng Zhang, Yong-gui Chen, Wei-min Ye, Jing Sun
Summary: This study investigated the retention performance of soil-bentonite (S-B) materials towards Cr(VI) and Zn(II) in heavy metal-contaminated sites. The results showed that the adsorption of Zn(II) onto the S-B mixture was larger than that of Cr(VI) in binary solutions. An increase in ionic strength enhanced the retention of Cr(VI), while it decreased the retention of Zn(II). In ternary solutions, the adsorption of Cr(VI) and Zn(II) was further enhanced compared to binary solutions. This research provides important insights for understanding the retention performance of S-B materials in complex chemical environments and selecting appropriate remediation strategies.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Weiqin Xing, Linchong Fang, James A. Ippolito, Fengying Cai, Yali Wang, Yale Wang, Yongqiang Yang, Liping Li
Summary: The effect of commonly used heavy metal immobilizing agents on risks of soil heavy metals has complex impacts on the availability and bioaccessibility of heavy metals, as well as on the organ, tissue, and overall health risks to animals and humans.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Jiefei Li, Zhaoping Zhong, Yuxuag Yang, Shan Zhang, Haoran Du, Pengkun Ren
Summary: The enrichment of Pb, Cd, Zn, As, and Cr by modified kaolin during MSW pyrolysis was investigated. Different modified kaolin showed selective adsorption for different heavy metals, and the thermal stability and active components of modified kaolin played important roles in the enrichment of heavy metals. The physical mixing of different modified kaolin achieved complementary advantages on the retention capacity of heavy metals.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Civil
Saswati Ray, Anil Kumar Mishra, Ajay S. Kalamdhad
Summary: The present study investigates the change in surface morphology, hydraulic behaviour, and sorption capability of two locally available Indian bentonites in the presence of different lead concentrations. The results reveal that the adsorption capability of the bentonites is influenced by their cation exchange capacity, swelling behaviour, and specific surface area.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Environmental Sciences
Fusheng Zha, Hao Qin, Long Xu, Yinbin Shen, Bo Kang, Yuzhao Wu
Summary: The soil-bentonite (SB) slurry-based barrier technology is effective in isolating heavy metal contaminants, but the deterioration effects caused by heavy metals need to be assessed. This study quantitatively analyzed the deterioration effects through experimental investigation and theoretical work, and proposed two deterioration parameters for quantitative analysis.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Engineering, Environmental
Anna Marszalek, Gabriela Kaminska, Noura Fathy Abdel Salam
Summary: This study evaluated the adsorption capabilities of thermally-treated bentonites and bentonite-carbon nanotubes composites for organic micropollutants and heavy metals in rainwater. The results showed that the composites had high removal percentages and fast adsorption rates for these pollutants.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Physical
Zhi-lei Zeng, Chuang Yu, Rao -ping Liao, Xiaoqing Cai, Zhi-hao Chen, Zhaokai Yu, Ze-xiang Wu
Summary: This study developed a carboxylate polymer grafted montmorillonite to improve the adsorption capacity of heavy metals. The structural changes of montmorillonite before and after modification were characterized. The results showed that the modified method significantly enhanced the adsorption performance of montmorillonite for cadmium ions.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Environmental Sciences
Dongdong Guo, Yong Wan, Jiangshan Li, Ruiqi Liu, Lei Liu, Qiang Xue
Summary: This study comparatively investigated the adsorption performances of nine commonly used modified bentonites on multiple contaminants, and analyzed the adsorption mechanisms using XRD and FTIR. The results showed that SB-16 modified bentonite had the highest adsorption capacities for phenol and Pb(II). The insertion of surfactant molecules in the interlayer space of montmorillonite increased the substrate spacing, changing the structural properties of bentonite and enhancing the adsorption of organic contaminants. The functional groups in the polymer formed a spatial three-dimensional cross-linking structure on the bentonite surface, providing more adsorption sites for heavy metal ions. These findings suggest the potential industrial applications of modified bentonite in a contaminant barrier system.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Environmental Sciences
Haoran Du, Zhaoping Zhong, Bo Zhang, Deqiang Zhao, Xudong Lai, Ningbo Wang, Jiefei Li
Summary: With the implementation of China's new municipal solid waste classification policy, attention has been focused on achieving waste-to-energy disposal of dry waste. Pyrolysis conversion of high-organic solid waste is a promising method for treating solid waste. The addition of kaolin as an additive during pyrolysis can effectively immobilize and stabilize heavy metals, with effective solid enrichment performance observed between 450-650 degrees Celsius.
Article
Agronomy
Liping Li, Kai Mao, James A. Ippolito, Weiqin Xing, Yali Wang, Tiantian Li
Summary: This study examined the impact of soil amendments on the movement of heavy metals and phosphorus in acidic and calcareous heavy metal-contaminated soils after one year of incubation. The addition of phosphate+bentonite amendment resulted in lower available phosphorus concentrations and similar heavy metal immobilization capacity compared to phosphate alone. Lime amendment increased soil phosphorus availability by increasing the negative charges of soil particles in both types of soils. Additionally, lime amendment significantly reduced the extractable concentrations of various heavy metals in the soils, especially in the acidic soil.
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
(2023)
Article
Engineering, Geological
Jiuzhou Zheng, Zhihong Zhang, Gailei Tian
Summary: The semipermeable membrane behavior of clay effectively reduces solute flux and can be beneficial in chemical containment applications. The membrane efficiency coefficient is influenced by the bentonite content, and there is a threshold content above which additional bentonite has limited effect on the membrane behavior.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2022)
Article
Engineering, Environmental
V. R. Ouhadi, R. N. Yong, T. Zareie, E. Arefikhah
Summary: Soil contamination with heavy metals is a common issue in the geo-environment worldwide. Research has shown that using polymers to modify clay soils is an effective method to improve the soil's geo-environmental properties. However, there is limited research on the interactions between polymers and contaminated soils.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Polymer Science
Zongkun Lin, Yuru Yang, Zizhan Liang, Lei Zeng, Aiping Zhang
Summary: In this study, a CTS/CA/BT composite physical hydrogel was constructed to prevent secondary pollution and enhance adsorption performance. Various analyses were used to determine the formation mechanism and structure of the hydrogel, which showed promising application prospects for heavy metal ion removal from water.
Article
Engineering, Geological
S. Y. Yuan, X. F. Liu, O. Buzzi
Article
Engineering, Geological
S. Yuan, O. Buzzi, X. Liu, J. Vaunat
Article
Engineering, Geological
Guanlu Jiang, Weizhi Chen, Xianfeng Liu, Shengyang Yuan, Lijun Wu, Chonglei Zhang
SOILS AND FOUNDATIONS
(2018)
Article
Engineering, Geological
Shengyang Yuan, Xianfeng Liu, Olivier Buzzi
Summary: Soil collapse is a phenomenon triggered by wetting a loaded soil with large pores, studied since the 1970s. Models predicting its occurrence have been proposed since the 1990s. Microstructural characteristics play a significant role in predicting the collapse of reactive soils.
Article
Engineering, Geological
Yin-Fu Jin, Zhen-Yu Yin, Wan-Huan Zhou, Xianfeng Liu
Article
Engineering, Geological
Weizhi Chen, Shengjie Min, Ayele Tesema Chala, Yanfei Zhang, Xianfeng Liu
Summary: Dynamic cone penetration testing has been extensively used in road construction, but not commonly employed in high-speed railways. This study proposes a simple method for assessing subgrade compaction quality through field tests and the establishment of correlation models.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING
(2022)
Article
Engineering, Geological
Shengyang Yuan, Xianfeng Liu, Olivier Buzzi
Summary: This study comprehensively investigated the effects of intrusion rate, freeze-drying method, and sample size on mercury intrusion porosimetry (MIP) applied to clayey soils. It found that the intrusion rate should be minimized for a quasi-static condition, freezing technique can modify pore size distribution, and sample size also affects the results. The study provides a technical basis for utilizing MIP on clayey soils.
ENVIRONMENTAL GEOTECHNICS
(2021)
Article
Engineering, Civil
Gaofeng Pan, Xianfeng Liu, Shengyang Yuan, Yibo Wang, Danxi Sun, Yan Feng, Guanlu Jiang
Summary: This paper presents a field filling test of Geogrid-reinforced floating pile-supported (GRFPS) embankments to study their performance in areas with moderately compressed soil. The evolution of soil arching, deformation of soil, piles, and geogrids during the construction and equilibrium stages were monitored. Results show the three stages of soil arching evolution, the critical filling heights, and the strain characteristics of geogrids.
TRANSPORTATION GEOTECHNICS
(2022)
Article
Chemistry, Physical
Shengyang Yuan, Xianfeng Liu, Yongxin Wang, Pierre Delage, Patrick Aimedieu, Olivier Buzzi
Summary: Soil properties are closely related to the soil microstructure. Two different techniques, MIP and X-mu CT, were used to characterize the microstructure of the soil in this study. The results showed that macropores were evenly distributed within the specimens, with most of them having a non-spherical shape and an aspect ratio smaller than three.
APPLIED CLAY SCIENCE
(2022)
Article
Engineering, Geological
Kang Chen, Xian-Feng Liu, Sheng-Yang Yuan, Sheng-Xin Pan, Jie Ma, Guan-Lu Jiang
Summary: The shakedown behavior of saturated red mudstone fill material was studied through a series of drained cyclic triaxial tests. The deformation response was found to be strongly correlated with the stress state, and the axial strain, axial strain rate, and dissipated energy were used to determine the shakedown limit and creep limit.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Yanfei Zhang, Xianfeng Liu, Shengyang Yuan, Tingting Zhang, Jinyang Song, Weizhi Chen
Summary: This study examines the stability of qanat tunnels in the context of railway construction in Iran, using random adaptive finite element limit analysis. The results suggest that considering the spatial variability of soil strength parameters has a negative impact on the stability of qanat tunnels. Detailed evaluation charts are provided to assess the probability of failure under different conditions.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Geological
Sun Danxi, Liu Xian-feng, Yuan Sheng-yang, Pan Gaofeng, Jiang Guanlu, Wang Hailong, Komine Hideo, Olivier Buzzi
Summary: The distribution of cracks in undisturbed expansive soil from Mile City, China was studied using X-ray computed tomography (X-ray CT) tests. The characteristics of the cracks were quantitatively studied and a conceptual model of crack development was proposed.
SOILS AND FOUNDATIONS
(2023)
Article
Engineering, Geological
Yanfei Zhang, Xianfeng Liu, Shengyang Yuan, Weizhi Chen, Daniel Dias
Summary: This paper developed a two-dimensional laboratory system to investigate the influence of progressive failure on the stability of deeply buried qanat tunnels. Experimental results clearly show the progressive evolution of soil arching effect in the dry sand associated with the progressive failure of the tunnels. The collapse of the deep buried qanat tunnel results in ground earth pressure redistribution.
SOILS AND FOUNDATIONS
(2023)
Article
Engineering, Geological
Chen Kang, Liu Xian-feng, Yuan Sheng-yang, Pan Shen-xin, Ma Jie, Jiang Guan-lu
Summary: This study investigated the accumulative deformation behavior of saturated red mudstone fill through cyclic triaxial tests and identified different deformation modes and stress state limits. The stability of the fill material can be improved by increasing confining pressure and reducing cyclic stress ratio. Recommendations for enhancing stability include the use of drainage facilities and improved fill material in the design of the subgrade's surface layer.
ROCK AND SOIL MECHANICS
(2022)
Article
Engineering, Geological
Shengyang Yuan, Xianfeng Liu, Enrique Romero, Pierre Delage, Olivier Buzzi
GEOTECHNIQUE LETTERS
(2020)
Article
Chemistry, Physical
Nadine J. Kanik, Artur Kuligiewicz, Jeffrey T. Cullen
Summary: This study examined the effects of different pre-treatments on the structural H-isotope composition of clay minerals. The results showed that different pre-treatments had varied impacts on different clay minerals, and the choice of pre-treatment should be based on the specific properties and mineralogy of the samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Lorenzo Lisuzzo, Giuseppe Cavallaro, Stefana Milioto, Giuseppe Lazzara
Summary: This study proposes Pickering emulsions based on wax and halloysite clay nanotubes for coating silk sutures to increase their loading capacity towards eosin. The presence of halloysite/wax microspheres on the surface of silk sutures has also been explored for controlled release of hydrophobic drugs. The influence of the coating on the thermal and mechanical properties of the sutures has been studied using various techniques. In conclusion, the wax/halloysite Pickering emulsions can successfully generate hydrophobic microdomains on the surface of silk sutures, leading to enhanced flexibility and improved loading capacity towards eosin.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Bruna F. Alves, Rita C. P. Nunes, Luiz C. Bertolino, Elizabete F. Lucas
Summary: Operational problems in the oil industry caused by the precipitation of paraffins can be prevented by using polymeric additives. This article evaluates the use of polymeric nanocomposites as pour point reducers in different types of crude oil and finds that they are more efficient than pure poly(ethylene-covinyl acetate) (EVA) in reducing the pour point. The nanocomposites also modify the wax crystals and reduce the viscosity of the oil samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
K. A. Daniels, C. C. Graham, A. C. Wiseall, J. F. Harrington, P. Sellin
Summary: Geological storage with clay buffer is widely preferred for removing hazardous radioactive waste. The impact of fluid salinity and void space on the swelling behavior of barrier bentonites was examined through experiments. The findings suggest that clay swelling is suppressed at higher salinities, which affects the void-filling process.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
N. Werling, A. Kuligiewicz, A. Steudel, R. Schuhmann, F. Dehn, K. Emmerich
Summary: Thermal treatment of clay minerals can be used to produce building materials and environmentally friendly binders. This process involves dehydration, dehydroxylation, breakdown of structure, and recrystallization of high temperature phases. Rehydration and rehydroxylation are important factors to consider for geopolymers and SCM.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Xuan Wang, Hao Ding, Zhuoqun Xu, Jianmeng Zhang, Yanbin Yao
Summary: Rutile nano-TiO2 was loaded onto the surface of sericite to prepare sericite-rutile composite particles, which were then modified with HDTMS and sprayed onto the substrates to form sericite-rutile/HDTMS composite coatings with UV shielding and superhydrophobic self-cleaning properties. The coating exhibited good UV shielding rate and remained superhydrophobic after UV irradiation. The hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS contributed to the superhydrophobicity and UV shielding effect of the coating.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Kailang Sun, Taojun Zhang, Jie Zhou, Yonghong Liu, Minfeng Zeng, Zhen Yang, Ruokun Feng, Xiaorong Ren, Peng Zhang, Baoyi Wang, Xingzhong Cao
Summary: Chitosan-Pd0 nano particles encapsulated in Al, Co-pillared montmorillonite nanocomposites were successfully synthesized using a facile one-pot heat treatment method. The Al, Co pillaring effectively expanded the surface area and generated numerous mesopores in the interlayer space of the MMt. The resultant nanocomposite exhibited similar high comprehensive catalytic performances as the one prepared by the regular divided-multistep method. The encapsulation of CS chains and doping of Co in the Al pillaring also contributed to the improved catalytic performance.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Nathalie Fagel, Isabel Israde-Alcantara, Reza Safaierad, Marttiina Rantala, Sabine Schmidt, Gilles Lepoint, Pierre Pellenard, Nadine Mattielli, Sarah Metcalfe
Summary: Environmental conditions significantly influence clay minerals, and studying clay sediments in tropical lakes can provide valuable insights into past environmental conditions. In this study, multiproxy records from sediment cores of three crater lakes in central Mexico were analyzed. The results showed that disordered kaolinite, formed through hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments. The abundance of kaolinite varied in relation to organic carbon and organic matter-related elements, and showed opposite trends with lithogenic elements. Geochemical data suggested that the increase in kaolinite abundance is linked to the formation of organo-mineral aggregates and lake level changes in closed basins.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
M. J. Martin-Alfonso, A. Mejia, F. J. Martinez-Boza, P. Partal
Summary: The drilling industry is facing new challenges to develop eco-friendlier drilling fluids. Organic modified sepiolite dispersed in oil can be an excellent additive with suitable rheological properties. This study investigated the effect of alkyl ammonium modifiers on the microstructure and rheological properties of sepiolite-vegetable oil dispersions under high-temperature and high-pressure conditions.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Weiquan Zhan, Siyuan Yang, Shenxu Bao, Liuyi Ren, Cheng Liu
Summary: The interaction between talc and the depressor CMC was investigated through molecular dynamics simulation and density functional theory calculation. It was found that CMC showed stronger adsorption on the edge plane of talc due to enhanced interactions with polar groups and water molecules. The study also revealed specific interactions between H atoms in CMC and O atoms in the edge plane, as well as between O atoms in CMC and Si, Mg atoms in the edge plane. Hydration shells on the basal and edge planes of talc were examined to explain the phenomenon.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Pierre Dramou, Yiyang Sun, Xu Ni, Fangqi Wang, Hua He
Summary: In this study, a magnetic nanocomposite was prepared and used for the separation of rutin from real samples through magnetic solid phase extraction (MSPE). The nanocomposite exhibited high specific surface area, chemical and thermal stability, water solubility, and easy separation in aqueous solution. Characterization and experiments confirmed the successful synthesis and efficient enrichment ability of the nanocomposite.
APPLIED CLAY SCIENCE
(2024)