Article
Chemistry, Physical
Daisuke Kawamoto, Akane Miyazaki
Summary: This study investigated the adsorption behavior of [AuCl4-n(OH)(n)](-) on Al2O3 and delta-MnO2 through experiments, and found that there were differences in the adsorption behavior between the two solids. The Au(III) complex ions showed characteristics of inner sphere complexes on delta-MnO2 and achieved 100% adsorption within 30 minutes. Further analysis revealed that ligand exchange after adsorption was the key factor in inducing redox reactions.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Environmental
Guowen Dong, Ruiwen Han, Yajing Pan, Chengkai Zhang, Yu Liu, Honghui Wang, Xiaoliang Ji, Randy A. Dahlgren, Xu Shang, Zheng Chen, Minghua Zhang
Summary: This study found that adding MnO2 particles under intermittent illumination significantly promoted the mobility of Fe and As in arsenic-enriched soils, with higher dosage demonstrating greater effects. MnO2 amendments not only altered the soil microbial community structure, but also enhanced the reduction of Fe/As.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Shui-Wen Chang Chien, Chun-Ming Weng, Jen-Shen Chou, Cheng-Chung Liu
Summary: This study investigates the use of activated biochar materials for treating arsenic contaminated solution, revealing different oxidation and adsorption capacities between peanut char and corn char; corn char can adsorb more manganese; biochar coated with delta-MnO2 has larger mesopore surface area and volume.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Thermodynamics
Weifeng Zhang, Yuanlong Xu, Zhaoxiong Deng, Qiuhua Wang
Summary: The study demonstrates that the efficiency of chemical desorption can be significantly improved by using different desorption agents and operating under specific conditions. Under optimal conditions, the desorption rate can reach high levels, providing a promising alternative to traditional thermal desorption methods.
Article
Green & Sustainable Science & Technology
Tianyu Sun, Kai Fei, Longzhou Deng, Liping Zhang, Xiaojuan Fan, Yanhong Wu
Summary: This study evaluates the kinetics of phosphorus adsorption and desorption in different erodible soils. The results show that weathered granite soil has a higher adsorption capacity for phosphorus compared to laterite and sand soils. Adsorption mainly occurs in the early stage of the reaction, while desorption lasts for a longer period of time. By establishing a phosphorus loss standard curve, the maximum phosphorus loss in the entire region can be predicted and calculated.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Multidisciplinary
Nelson A. Rivera, Florence T. Ling, Zehao Jin, Ajith Pattammattel, Hanfei Yan, Yong S. Chu, Catherine A. Peters, Heileen Hsu-Kim
Summary: Coal combustion byproducts are enriched in arsenic (As) and selenium (Se), which are harmful to wildlife and humans if released into water and soils. This research aimed to determine the mineral associations and oxidation states of As and Se in fly ash at the nanoscale and microscale. The results showed that As and Se were associated with Ca- and Fe-rich particles and Se nanoparticles were attached to the surface of fly ash grains.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Environmental Sciences
S. L. Matzen, G. P. Lobo, S. C. Fakra, A. Kakouridis, P. S. Nico, C. E. Pallud
Summary: Plant-soil interactions play a crucial role in the availability of arsenic and nutrients in arsenic-contaminated soils, affecting the uptake, tolerance, and leaching of arsenic in plants. The availability of arsenic was higher and nutrient content was lower in coarse-textured soil, resulting in greater arsenic uptake, lower biomass, and higher leaching of arsenic from the soil. Pteris vittata hyperaccumulated arsenic from coarse-textured soil, but not from medium-textured soil. Arsenic uptake by the fern was always greater than the loss through leaching.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Boqian Yang, Xin Zhou, Yuyu Chen, Yuanyuan Fang, Hanjin Luo
Summary: The study developed a novel composite material with high adsorption efficiency for arsenic removal in water, using a simple in-situ synthesis method. Fe/Co-MOF-74 exhibited high adsorption rates for arsenic removal, fitting well with the Langmuir and pseudo-second-order models, with the main adsorption mechanisms being electrostatic adsorption and complexation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Environmental Sciences
Zheyong Li, Yajun Yuan, Lin Ma, Yihui Zhang, Hongwei Jiang, Jiqiang He, Yifan Hu, Shoushu Yuan, Matthew Ginder-Vogel, Shuxin Tu
Summary: The study found that selenium (IV) undergoes adsorption, oxidation, and desorption reactions on the surface of δ-MnO2 mineral, with oxidation reaction being influenced by proton concentration, Se (IV) influent concentration, flow rate, and δ-MnO2 dosage, producing Mn (II) and Mn (III) products.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2021)
Article
Engineering, Environmental
Yushan Ni, Jie Zhang, Zhaoxia Yang, Litao Kang, Dongjiang You
Summary: In this study, recyclable CDI electrodes composed of sea urchin-like iron-manganese composites were used to address the adsorption of arsenic ions in wastewater. The results showed that the composite electrode exhibited high adsorption capacity and removal rate for arsenic ions under specific operating conditions, and also demonstrated excellent selective adsorption capacity in the presence of lead and cadmium ions. The recyclable composite electrode was capable of rapid desorption and maintained a high initial capacity after multiple cycles of adsorption/desorption.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Shahnoor Alam Khan, Monzur Alam Imteaz
Summary: Based on previous experiments, Skye sand is an effective adsorbent for removing arsenic from water. This paper presents experimental results on arsenic and iron removal using a prototype filter made of Skye sand. The results show that the current filter consistently removes arsenic to a level below the detection limit and also removes iron below the acceptable limit. The prototype filter is capable of producing arsenic-free water continuously for a long period of time.
Article
Geochemistry & Geophysics
Xuan Pan, Li-Zhu Liu, Zhen-Yuan Nie, Jin-Lan Xia
Summary: Arsenopyrite is a gold-bearing sulfide mineral that hinders gold leaching. Oxidation pretreatment is required for effective gold leaching, but it can lead to arsenic mobility and environmental issues. This study used eco-friendly d-MnO2 to oxidize arsenopyrite and control arsenic fate. The addition of d-MnO2 significantly promoted the oxidation of Fe(II) and As(-I) and mediated Fe/As speciation transformation. The dosage of d-MnO2 controlled the oxidation efficiency and regulated arsenic fate.
Article
Environmental Sciences
Abdul Qayoom Memon, Shoaib Ahmed, Zulfiqar Ali Bhatti, Ghulamullah Maitlo, Abdul Karim Shah, Shaukat Ali Mazari, Atta Muhammad, Abdul Sattar Jatoi, Ghulam Abbas Kandhro
Summary: The indigenous hematite iron ore was chemically activated to remove arsenic efficiently under specific conditions. Langmuir and Freundlich isotherms were used to evaluate adsorption potential, with a maximum adsorption capacity observed through Langmuir isotherm. Kinetics of arsenic adsorption showed the best fit with pseudo-first-order kinetics. Characterization of the hematite iron ore before and after arsenic adsorption was conducted using XRD, SEM, and EDX.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Geochemistry & Geophysics
Sifat Azad Papry, Tarek L. Rashwan, Pulin K. Mondal, Mehran Behazin, Peter G. Keech, Magdalena M. Krol
Summary: This study investigates the sorption behavior of bisulfide (HS-) onto bentonite, and finds that HS- sorption occurs faster and has a higher equilibrium sorption capacity at higher temperatures. The study also suggests that the irreversible sorption of HS- onto bentonite may be due to the chemical reactions between HS- and the iron present in bentonite, forming iron monosulfide (FeS). These findings provide critical information to better understand the sorption mechanism of HS- on bentonite and reduce HS- transport in deep geological repositories.
APPLIED GEOCHEMISTRY
(2023)
Article
Chemistry, Physical
Pawel Peczkowski, Piotr Zachariasz, Cezariusz Jastrzebski, Jaroslaw Pietosa, Elzbieta Drzymala, Lukasz Gondek
Summary: This article reports on the significant suppression of superconductivity in the Eu1-xPrxBCO cuprates, which is caused by the replacement of non-magnetic Eu3+ ions with Pr3+ carrying a magnetic moment, resulting in depletion and localization of carriers. An inverse phenomenon was observed with increasing Pr content, where the optical phonons responsible for Cu-O bond vibrations deteriorated. The research also proposed a schematic diagram for Eu1-xPrxBCO to consolidate the presented findings.
Article
Environmental Sciences
Jingzhao Wang, Chao Ren, Hongtao Wang, Wei Li
Summary: The study demonstrates that phosphate modification can enhance the fluoride adsorption performance of calcite, especially at low concentrations; however, at high concentrations, the predominant defluoridation mechanism is the formation of CaF2 precipitates, with the contribution of newly formed HAP being insignificant.
Article
Environmental Sciences
Ling Li, Lu Liao, Bing Wang, Wei Li, Taoze Liu, Pan Wu, Qingya Xu, Shirong Liu
Summary: This study investigated the mechanism of Sb(V) adsorption by phosphogypsum-modified anaerobic digested distillers' grain (PADC) biochar through experimental and modeling approaches. The results showed that PADC biochar had abundant lamellar and vesicular structures with significant calcium ion loading on the surface. The adsorption process followed the Elovich equation and the Redlich-Peterson model, and intraparticle diffusion played an important role. The maximum adsorption capacity of PADC biochar for Sb(V) exceeded that of pristine biochar, making it suitable for the treatment of Sb-contaminated mine water. Fourier transform infrared spectra, X-ray photoelectron spectroscopy, X-ray diffractometry, and Transmission electron microscopy with energy dispersive X-ray spectroscopy analyses revealed that the dominant mechanism of Sb(V) removal was the formation of complexes or surface precipitation as well as electrostatic adsorption.
ENVIRONMENTAL POLLUTION
(2022)
Article
Geochemistry & Geophysics
Zhao Wang, Kideok D. Kwon, Caroline Peacock, Xinxin Mo, Wenxian Gou, Xionghan Feng, Wei Li
Summary: Mineral-solution interface reactions play a crucial role in the mobility, fate, and isotopic fractionation of trace metals such as zinc in the natural environment. This study investigates the stable isotope fractionation of zinc during adsorption to todorokite, and reveals the molecular-level processes and structural changes that control the isotopic behavior. The results provide valuable insights into zinc isotope signatures in Mn-rich sediments and contribute to a better understanding of zinc isotopes in the ocean.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Wenxian Gou, Xiaoming Wang, Mengqiang Zhu, Dong-Xing Guan, Xinxin Mo, Hongtao Wang, Wei Li
Summary: Layered double hydroxides (LDHs), a type of anionic clays, have wide applications in environmental remediation, catalysis, and nanocomposite materials. This study characterized the cation arrangement of multiple multimetallic LDHs using advanced techniques and found that Co, Ni, and/or Zn are randomly distributed with Al in the LDHs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Environmental Sciences
Wenxian Gou, Xinxin Mo, Chao Ren, Hongtao Wang, Wei Li
Summary: This research investigated the uptake mechanisms of Co, Ni, and Zn on gamma-Al2O3 at pH 7.5 using various analytical techniques. The study found that the formation of multimetallic layered double hydroxides (LDHs) was observed, and the shape and crystallinity of LDHs were correlated with the sorbed metal type and molar ratio. These findings have significant implications in heavy metal remediation and environmental risk assessment.
Article
Geochemistry & Geophysics
Xinxin Mo, Ziyi Zhuang, Chao Ren, Wei Li
Summary: This research examined the potential of calcined palygorskite for defluoridation of groundwater contaminated with fluoride, showing higher adsorption performance compared to activated alumina under alkaline conditions. The study found that changes in the crystal structure and exposed > MgOH2 groups in the calcined samples may play a crucial role in fluoride removal.
APPLIED GEOCHEMISTRY
(2022)
Article
Engineering, Environmental
Wenxian Gou, Wei Li, Matthew G. Siebecker, Mengqiang Zhu, Ling Li, Donald L. Sparks
Summary: Silicates affect zinc sorption on aluminum oxide surfaces, inhibiting the formation of Zn-Al LDH at high silicate concentrations. Significant zinc isotope fractionation was observed, indicating the presence of a zinc-silicon bonding environment. STEM analysis showed spatial coupling between sorbed silicates and gamma-Al2O3, suggesting the formation of Al-Si-Zn ternary inner-sphere complexes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
Hui Yin, Bruno Lanson, Shuang Zhang, Lu Liu, Caroline L. Peacock, Jeffrey E. Post, Mengqiang Zhu, Wei Li, Qian Wang, Jing Zhang, Yong Yang, Guohong Qiu, Xionghan Feng, Wenfeng Tan, Fan Liu
Summary: This study reveals the transformation of phyllomanganates under dry conditions and the fate of associated transition metal elements. The results show that the crystallinity, morphology, Mn oxidation state, and Ni binding mechanisms of hexagonal birnessite are essentially unaffected in the dry state. However, heating aged Ni-doped birnessite results in changes in the sample's structure and increased thermal stability.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Engineering, Environmental
Xinran Yan, Wei Li, Chuanwei Zhu, Caroline L. Peacock, Yizhang Liu, Hui Li, Jing Zhang, Mei Hong, Fan Liu, Hui Yin
Summary: This study investigates the mechanisms of Zn isotope fractionation during adsorption and substitution in FeOOH polymorphs. The results show that heavy Zn isotopes preferentially enrich onto solids, while the incorporation of Zn into goethite and lepidocrocite by substituting for lattice Fe preferentially sequesters light Zn isotopes. These findings provide direct experimental evidence of the Zn isotope fractionation mechanisms.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Xinxin Mo, Yoshio Takahashi, Matthew G. Siebecker, Wenxian Gou, Zhao Wang, Xiancai Lu, Wei Li
Summary: The fate and transport of Zn in aqueous geological environments are controlled by geochemical reactions at the mineral/water interface. However, the Zn fixation mechanisms and the relationship between Zn isotope fractionation and sorption mechanisms are still unclear. This study employed various spectroscopic techniques to elucidate the sorption/precipitation mechanisms of Zn at palygorskite/solution interfaces and demonstrated that Zn sorption mechanisms vary with pH, ionic strength, initial concentration, and reaction time.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Zhao Wang, Caroline Peacock, Kideok D. Kwon, Xueyuan Gu, Xionghan Feng, Wei Li
Summary: This study investigates the Zn isotope fractionation on birnessite caused by adsorption reactions under different reaction times, pH values, and Zn concentrations. The results show that at pH 3-5 and Zn concentrations of 0.05-0.3 mM, the isotopic fractionation (D66Znadsorbed-aqueous) is around -0.46 +/- 0.04%, and gradually increases to -0.09 +/- 0.05% at pH 6-8 and Zn concentrations of 0.2 mM. The distinct isotopic fractionation of Zn is related to the differences in Zn local structure at different reactive sites of birnessite, including external edge sites and interlayer vacancies.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Editorial Material
Engineering, Environmental
Hang Deng, Daniel Giammar, Wei Li, Avner Vengosh
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Song Yan, Tao Sun, Yuanfeng Cai, Wei Li, Yuguan Pan, Jinhai Yu
Summary: Due to high demand, Li-bearing montmorillonite (Li-Mt) deposits have become a focus for exploration, but the mechanisms of Li enrichment in these deposits remain unclear. This study investigated the water-rock reactions in F- and Cl-rich systems at different Li concentrations, temperatures, durations, and pH conditions. The results suggest that the reactions differ between the two halogen systems, with deprotonation occurring in the LiCl-Mt system and dehydroxylation occurring in the LiF-Mt system. Lithium is adsorbed or exchanges with cations in the interlayer of Mt, and the adsorption capacity is greater in the LiF-Mt system. The pH has a stronger effect in the LiF-Mt system, and the residual Li in the inner-sphere is crucial for the metallogenesis of Li-Mt deposits.
Article
Chemistry, Analytical
Cheng Cao, Tao Li, Tianyu Chen, Gaojun Li, Wei Li, Jun Chen
Summary: There has been a growing interest in using lithium isotopes in marine carbonates to trace chemical weathering and clay formation. However, it is technically challenging to determine the Li isotope composition in carbonate samples due to the imperfect Li separation and low Li concentration in carbonates. A dual-column chromatography system for Li purification is presented, which has a large loading capacity, complete Li recovery, and efficient elution time. The procedure is validated with certified reference materials and the precision of Li isotope measurement is high.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Environmental Sciences
Chao Ren, Hongtao Wang, Junfeng Ji, Wei Li
Summary: This study investigated the mechanisms of F- adsorption by calcined LDHs (CLDH) using various analytical techniques. The results showed that calcination greatly enhanced the F- affinity of LDH, especially at high pH. The study also revealed the irreversible changes in LDH structure caused by calcination and the decrease in crystallinity with increasing calcination temperature.