Article
Chemistry, Multidisciplinary
Jien Ye, Yating Luo, Jiacong Sun, Jiyan Shi
Summary: The study found that bentonite-modified nZVI showed improved efficiency in removing Cr(VI) and enhanced transport performance compared to nZVI. The transport of both materials was negatively correlated with the clay composition in different soils. Besides, modification of nZVI by bentonite reduced toxicity to luminous bacteria and ryegrass, indicating potential for in situ environmental remediation.
Article
Engineering, Chemical
Sheng Cao, Shao-zhong Hu, Dan Luo, Ting Huang, Nan Zhang, Yan-zhou Lei, Yong Wang
Summary: The study successfully coated polydopamine (PDA) nanoparticles onto the smooth surface of a melamine foam (MF) skeleton through a bio-inspired functionalization method, resulting in changes in surface roughness and chemical features. The PDA-coated MF (MF-PDA) showed good removal ability, high adsorption selectivity, and high desorption ability towards highly toxic Cr(VI), making it a promising adsorbent for removing this toxic metal ion from wastewater. Additionally, the coated PDA had a strong reduction effect on Cr(VI), converting a significant portion of toxic Cr(VI) into lower-toxic Cr(III) during adsorption.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Wenwen Ji, Yuan Liang, Hui Ma, Shengyan Pu, Uttam Kumar Sahu
Summary: This study focused on the use of low-cost magnetic biochar adsorbent prepared from Litchi chinensis peel for the amelioration of Cr(VI) through reduction-adsorption process. The results showed that the magnetic biochar had good mesoporous nature and magnetic properties. Under the optimized conditions, the adsorbent achieved a removal efficiency of 95.38% for Cr(VI), and the adsorption mechanism was explained through XPS analysis.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Xiao Tan, Yinjie Zhang, Meng Liu, Jinman Cao, Guilan Duan, Jun Cui, Aijun Lin
Summary: In this study, a novel layered double hydroxide was prepared through ultrasonic-assisted co-precipitation method, which can efficiently remove Cr(VI) contamination in water and has good removal effects at different pH ranges. The results of the study indicate that U-Fe/Al-LDH is a promising remediation agent and a feasible method for Cr(VI) removal.
Article
Geochemistry & Geophysics
Jinhao Yu, Danqing Liu, Sen Yang, Yilian Li
Summary: This study selected the optimal sulfide-modified nanoscale zero-valent iron (S-nZVI) for the removal of Cr(VI) from groundwater and discussed its mechanism and influencing factors. CaSx-nZVI exhibited the highest removal efficiency and showed a higher removal rate in highly chromium-containing groundwater.
APPLIED GEOCHEMISTRY
(2022)
Article
Engineering, Environmental
Fenglei Liu, Yiting Lou, Fang Xia, Baowei Hu
Summary: A novel collaborative strategy was developed by loading nZVI into the inter-layer structure of MBenes, enhancing the removal of U(VI)/Cr(VI). The results showed that nZVI@MBenes exhibited higher removal rate and saturated capacity compared to nZVI or MBenes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Shakeel Ahmad, Feilong Gao, Honghong Lyu, Jingkang Ma, Beibei Zhao, Siyu Xu, Cholnam Ri, Jingchun Tang
Summary: This study investigates the removal of hexavalent chromium and nitrobenzene using iron and nitrogen doped biochar composites. The results show that the Fe1-N1-BC1 composite exhibits higher efficiency and stability in pollutant removal, and is capable of simultaneously removing different types of pollutants.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Ruixin Yan, Xiuping Feng, Long Kong, Qun Wan, Weilin Zheng, Takeshi Hagio, Ryoichi Ichino, Xinde Cao, Liang Li
Summary: A novel composite material FeS/HTs was synthesized and demonstrated high efficiency in removing hexavalent chromium from water. The superior adsorption capacity of FeS/HTs, attributed to the combination of abundant adsorption sites and powerful reduction properties, suggests potential applications in chromium removal.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Chun Yang, Chazhong Ge, Xiaoliang Li, Lu Li, Bin Wang, Aijun Lin, Wenjie Yang
Summary: The novel material nZVI/SS/BC synthesized for the removal of hexavalent chromium from simulated wastewater showed promising results with the use of biochar pyrolyzed at 600 degrees Celsius and soluble starch during synthesis. The material exhibited high adsorption capacity, increased surface area, and improved removal efficiency.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Multidisciplinary Sciences
Eslam Salama, Mahmoud Samy, Hassan Shokry, Gehan El-Subruiti, Asmaa El-Sharkawy, Hesham Hamad, Marwa Elkady
Summary: In this study, nano zero-valent iron (NZVI) was fabricated under optimum conditions and immobilized with silica and starch to form composite nanomaterials. The silica-modified NZVI showed the highest removal efficiency for hexavalent chromium (Cr(VI)). The presence of other ions and humic acid reduced the removal efficiency, but it could be improved by adding hydrogen peroxide. The reusability of silica-modified NZVI was investigated and the removal mechanism was suggested to be a physicochemical process. The study also demonstrated the potential of NZVI for long-term use in removing emerging water pollutants.
SCIENTIFIC REPORTS
(2022)
Article
Green & Sustainable Science & Technology
Min Zhuang, Hui Wang, Lu Qi, Liqiang Cui, Guixiang Quan, Jinlong Yan
Summary: In this study, activated biochar was successfully prepared as a support for sulfidated nanoscale zero-valent iron (S-nZVI@ABC), significantly increasing the specific surface area and achieving even particle dispersion for improved removal efficiency of Cr(VI). Higher S/Fe ratio, dosage, lower pH, and Cr(VI) concentration all contributed to enhanced removal efficiency. The removal process was endothermic and involved multiple interaction mechanisms in the removal of Cr(VI) by S-nZVI@ABC.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Jiayao Li, Chen Tang, Min Zhang, Chun Fan, Dongbei Guo, Qiuying An, Guangshun Wang, Hao Xu, Yi Li, Wei Zhang, Xiaoxuan Chen, Ran Zhao
Summary: This study demonstrated that the bacterium strain M52 with strong Cr(VI) removal ability primarily removes Cr(VI) through bio-reduction, rather than bio-adsorption. Characterization analyses and genome analyses revealed the potential mechanisms of bio-reduction, providing a theoretical basis for Cr(VI) bioremediation.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Engineering, Environmental
Yiran Sun, Fei Yu, Liqing Li, Jie Ma
Summary: The study introduces a flexible one-pot approach to synthesize amino-functional graphene sponge adsorbents for eliminating Hexavalent Chromium in aqueous environment, which showed outstanding adsorption capacity and reduction efficiency. The novel adsorbents have great potential in treating chromium containing wastewater.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
J. J. Lian, M. Yang, H. L. Wang, Y. Zhong, B. Chen, W. L. Huang, P. A. Peng
Summary: This study investigates the removal of hexavalent molybdate by sulfidated nanoscale zerovalent iron (S-nZVI) and finds that S-nZVI shows high reactivity in removing Mo(VI) from contaminated water. The removal rate is influenced by solution pH, S/Fe ratio, and the presence of competing anions and divalent cations, indicating that S-nZVI can be a promising environmentally friendly material for effective Mo(VI) removal.
WATER SCIENCE AND TECHNOLOGY
(2021)
Editorial Material
Environmental Sciences
Hanui Yang, Namgyu Kim, Donghee Park
Summary: Review papers are important for researchers to align their research and for beginners to quickly gain relevant knowledge. This particular review paper by Othmani et al. (2022) focuses on the adsorptive removal of three harmful pollutants using agricultural waste materials. However, the section related to Cr(VI) removal lacks important information regarding the redox reaction mechanism involved. It is crucial to interpret the factors affecting Cr(VI) removal in terms of the redox reaction concept rather than simple anion adsorption.
ENVIRONMENTAL RESEARCH
(2023)