Article
Engineering, Chemical
Yiqun Liu, Liuke Cai, Xiaoyu Wang, Zhihao Chen, Wenzhong Yang
Summary: To address arsenic contamination in groundwater, hydrated iron oxide gel beads (CS-HFO) and iron manganese oxide gel beads (CS-FMO) adsorbents were prepared. CS-FMO adsorbent showed better adsorption performance due to rich adsorption sites and oxidation capacity. Langmuir model calculations revealed the saturation adsorption of As(V) and As(III) by CS-FMO as 26.65 mg/g and 35.96 mg/g respectively. After 10 cycles of regeneration, CS-HFO and CS-FMO demonstrated excellent sustainable arsenic removal ability. The high selectivity of CS-HFO and CS-FMO adsorbents was confirmed through competing pollutants and fixed-bed column experiments, making them promising for future application in arsenic contamination removal.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Qiyuan Lu, Weimin Zhang, Xia Xiong, Yadan Guo, Dandan Huang, Haiyan Liu
Summary: Hydroxyapatite-coated quartz sands were successfully synthesized and used as a permeable reactive barrier (PRB) medium for removing manganese from contaminated water. The study investigated the effects of particle size, initial concentration of manganese, and hydraulic load on manganese removal. The results showed that the initial concentration of manganese had the greatest impact on Mn(II) removal. The adsorption mechanisms were mainly ion exchange and dissolution-precipitation. The hydroxyapatite-coated quartz sands proved to be an effective medium for treating manganese-contaminated water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Nimisha Thakur, W. Armstrong
Summary: A green, low-cost adsorbent based on geopolymer microspheres was reported for arsenic adsorption for the first time. The iron oxide modified geopolymer microparticles showed excellent arsenic adsorption performance, especially with high removal rates for different arsenic species under specific conditions.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Chemical
Somayeh Asadi Haris, Shadab Dabagh, Hamidreza Mollasalehi, Yavuz Nuri Ertas
Summary: Superparamagnetic iron oxide nanoparticles (SPIONs) were synthesized and used for efficient removal of arsenite (As(III)). The optimum removal percentages for SPIONs and SPIONs-Alg were 99% and 90%, respectively, at pH 7, 30 degrees C, and 6.5 mg/L As (III) concentration. The Langmuir isotherm model fitted the equilibrium data better than Freundlich. The adsorption kinetic data showed a better fit to the pseudo-second-order kinetic model. SPIONs-Alg could be easily collected, recovered, and reused for multiple cycles with high sorption efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Huiping Zeng, Chengbo Liu, Fanshuo Wang, Jie Zhang, Dong Li
Summary: This paper summarizes the application of iron sludge generated in water plants using iron and manganese containing groundwater as a water source for arsenic removal. Different types of arsenic removal adsorbents are introduced and the problems and difficulties in engineering application are discussed.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
A. Mazeikiene, R. Vaiskunaite, J. Sarko
Summary: This study found that using OG filter media significantly enhances the removal efficiency of PO4-P from biologically treated wastewater, meeting the required evaluation parameters and producing stable filtrate.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Tao Luo, Rasesh Pokharel, Tao Chen, Jean-Francois Boily, Khalil Hanna
Summary: This study examined the reactivity of pipemidic acid with quartz particles coated with a mixture of manganese oxide and goethite under different conditions. The results showed that the mixture enhanced redox reactivity and has important implications in predicting the fate and transport of redox-active organic compounds and environmental remediation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Trung Huu Bui, Van Sy Pham, Nguyen Thanh-Nho, Quoc An Trieu
Summary: A low-cost and effective nano-composite of iron-manganese oxide incorporated active rice husk silica (FMRS) is reported for efficient removal of arsenic from water. The FMRS exhibits high selectivity towards arsenic and maintains good removal efficiency over multiple cycles, indicating its high potential for long-term field applications in arsenic removal.
CLEAN-SOIL AIR WATER
(2021)
Review
Soil Science
Chaolei Yuan, Qi LI, Zhaoyang Sun, Wenjun Zhang, Jiangrong Chen, Zheng Chen, Shuo Na, Hongwen Sun
Summary: Arsenic (As) contamination in soil and water is a serious concern due to its threat to the ecosystem and human health. Remediation strategies for As contamination aim to oxidize the toxic and mobile As(III) to As(V). This article reviews the chemical oxidation of As(III) in the environment, focusing on the roles of iron (Fe) and manganese (Mn) oxides, and summarizes the application of these oxides for As remediation. Understanding the mechanisms and factors influencing As(III) oxidation by Fe and Mn oxides, as well as developing innovative methods and materials based on these oxides, are necessary for effective regulation and remediation.
Article
Engineering, Environmental
Lihu Liu, Qi Qiao, Wenfeng Tan, Xuecheng Sun, Chengshuai Liu, Zhi Dang, Guohong Qiu
Summary: This study utilized electrochemical redox to enhance the As removal efficiency of iron-manganese nodules and explored their potential application in treating arsenic-contaminated wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Jiaolong Ying, Xiaopeng Qin, Dongguang Wen, Fuyang Huang, Fei Liu
Summary: This study investigated the reactivity changes of birnessite-coated sand with the fluctuations of ionic strength of infiltration water and found that the higher cation content and pH in groundwater led to lower reactivity compared to rainwater. The passivated birnessite-coated sand's reactivity was recovered instantaneously, restoring approximately one-third of the pristine reactivity. The desorption of Na+ and the removal of lincomycin exhibited a two-stage reaction pattern during recovery, and the LIN removal correlated with Na+ desorption.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Xianjun Xie, Chun Lu, Rui Xu, Xueqian Yang, Lu Yan, Chunli Su
Summary: Fe-Mn bimetallic oxides with mesoporous structure were synthesized and studied for arsenic removal, with Fe1Mn1-300 showing the largest specific surface area and maximum arsenic absorption capacity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Chemical
Thi Hai Nguyen, Paripurnanda Loganathan, Tien Vinh Nguyen, Saravanamuthu Vigneswaran, Thi Hoang Ha Nguyen, Hai Nguyen Tran, Quoc Bien Nguyen
Summary: In this study, pomelo peel biochar coated with iron (PPCI) was investigated as an adsorbent for the removal of arsenic from water. The PPCI showed high adsorption capacity for both arsenite and arsenate ions, and its performance was not affected by the solution pH. The characterization analysis revealed the adsorption mechanisms involved in the process.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Environmental
Guiyuan Cai, Lipin Li, Daikun Li, Qinyu Wang, Luyu Zhang, Jun Zhang, Wei Zuo, Yu Tian
Summary: A nonhomogeneous catalytic oxidation-adsorption system was constructed by coupling iron-manganese composite oxide with sulfite to enhance the recovery of oxidative capacity and accelerate the removal of arsenite. The FeMnOx/S(IV) system showed efficient and fast arsenite removal, with a high adsorption capacity. The system was also found to be superior to the FeMnOx alone system in terms of arsenite removal.
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)