Article
Chemistry, Multidisciplinary
Jianwei Yang, Xiangpeng Tan, Muhammad Shaaban, Yajun Cai, Buyun Wang, Qi'an Peng
Summary: BC-nZVI composites are effective in removing Cr(VI) from contaminated soil while increasing microbial diversity and abundance, with no significant adverse effects on soil quality or microorganisms.
Article
Environmental Sciences
Wenxian Chen, Xiangwei Xu, Jinping Cui, Zhenyang Zhou, Yuyuan Yao
Summary: This study developed a novel bifunctional material that can efficiently degrade organic pollutants and eliminate hexavalent chromium. The material exhibited high apparent first-order constant and storage stability, enabling efficient degradation and removal of harmful substances at low temperatures.
Article
Environmental Sciences
Jian Zhang, Xianni Yang, Jun Shi, Mingyue Zhao, Weiqin Yin, Xiaozhi Wang, Shengsen Wang, Changai Zhang
Summary: The study demonstrated that ZVI supported by biochar derived from cellulose, hemicellulose, and their binary mixture showed better Cr(VI) removal capacity. The higher ordered and graphitic carbon structure was responsible for this improved performance, facilitating electron transfer and reduction of Cr(VI).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Ge Gao, Lei Zhang, Yixin Shi, Shengjiong Yang, Gen Wang, Huining Xu, Dahu Ding, Rongzhi Chen, Pengkang Jin, Xiaochang C. Wang
Summary: The study found that the microscopic galvanic cell (mGC) exhibited higher Fe(II) release performance compared to ordinary nanoscale-ZVI (nZVI), resulting in improved Cr(VI) removal efficiency. Density functional theory (DFT) revealed that the close proximity of cathode and anode in mGC enhanced the galvanic corrosion of Fe(0). Additionally, hydroxyl radicals generated by a series of side-reactions slightly hindered the reduction of Cr(VI) in the system.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Environmental Sciences
Iziquiel Cecchin, Cleomar Reginatto, Wagner Siveris, Fernando Schnaid, Antonio Thome, Krishna R. Reddy
Summary: The study evaluated the efficiency of applying pressure-injected nanoscale zero-valent iron (nZVI) suspension to remediate Cr(VI)-contaminated clay soil. Results showed significant reduction of Cr(VI) with average reduction rate of 76.52% in 15 days, indicating nZVI as an effective alternative for remediation. Moisture content was identified as a key parameter for the effectiveness of the remediation.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Engineering, Environmental
Wenying Zhang, Linbo Qian, Lu Han, Lei Yang, Da Ouyang, Ying Long, Zifei Wei, Xinzhu Dong, Cong Liang, Jing Li, Mingyue Gu, Mengfang Chen
Summary: The study successfully demonstrated simultaneous removal of Cr(VI) and TCE from aqueous solutions using AT-nZVI/PS systems, with removal efficiencies reaching over 90% for both contaminants.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Alena Pavelkova, Vendula Cencerova, Josef Zeman, Vojtech Antos, Jaroslav Nosek
Summary: Electric field assisted remediation using nano iron has shown significant results and economic benefits during pilot applications. This method is based on donating electrons to zero-valent iron with strong reductive capacity. Experimental results demonstrated the generation of ethene and ethane near the anode due to the presence of dissolved Fe2+ ions.
Article
Environmental Sciences
Alessio Siciliano, Giulia Maria Curcio, Carlo Limonti
Summary: The study conducted experimental research on the removal of chromium using zero valent magnesium particles in a packed batch column, finding that the process performance was significantly influenced by pH values, and the temperature had a correlation with removal yields depending on pH values. The results provide insights into the potential applications of zero valent magnesium in water and wastewater purification.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Linbo Qian, Ying Long, Hangyu Li, Zifei Wei, Cong Liang, Renlan Liu, Mengfang Chen
Summary: In this study, the removal of hexavalent chromium (Cr(VI)) and Trichloroethylene (TCE) by rice straw pyrolysis biochar supported nanoscale zero-valent iron (nZVI) was investigated. The results showed that biochar supported nZVI effectively removed Cr(VI) and TCE in single pollutant system, but mutual inhibition occurred when both contaminants were present. Therefore, the mutual inhibition effect should be evaluated in the remediation of combined contaminated groundwater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Wenying Zhang, Linbo Qian, Yun Chen, Da Ouyang, Lu Han, Xiao Shang, Jing Li, Mingyue Gu, Mengfang Chen
Summary: The attapulgite treated by HCl and HF showed increased silicon content and active silicon sites, leading to higher removal efficiency for Cr(VI). Silicon played a significant role in the reductive precipitation of Cr(VI) through Si-O-Fe coupling.
Article
Engineering, Chemical
Minhui Hou, Yu Zhang, Xin Jiao, Ning Ding, Yongli Jiao, Yuwei Pan, Jinkai Xue, Ying Zhang
Summary: Polyphenols were used to modify zero-valent iron (ZVI) and new catalysts were successfully synthesized. The modified ZVI showed improved removal efficiency of Cr(VI) due to enhanced electron transfer rate.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Miroslav Brumovsky, Jana Oborna, Petr Lacina, Michal Hegedus, Ondra Sracek, Jan Kolarik, Martin Petr, Josef Kaslik, Thilo Hofmann, Jan Filip
Summary: Laboratory studies have shown that sulfidated nanoscale zero-valent iron (S-nZVI) particles exhibit enhanced reactivity, reducing capacity, and electron selectivity for removing Cr(VI) from contaminated waters. Field experiments confirmed the applicability of S-nZVI for remediating a Cr(VI)-contaminated aquifer, demonstrating long-term decreases in Cr(VI) concentrations and groundwater redox potential.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Miao Cai, Jian Zeng, Yaozong Chen, Peng He, Fang Chen, Xu Wang, Jinye Liang, Chunyao Gu, Dongli Huang, Ke Zhang, Min Gan, Jianyu Zhu
Summary: In this study, a novel biochar-supported zero-valent iron composite was synthesized and characterized for the removal of Cu(II) and Cr(VI). The composite showed better removal performance compared to single biochar and mineral, with a pH-dependent removal mechanism via heterogeneous multilayer chemisorption. Electrochemical analysis demonstrated higher electrical conductivity and electron transfer rate in the composite, indicating its potential for efficient heavy metal remediation.
Article
Chemistry, Multidisciplinary
Xiangpeng Tan, Muhammad Shaaban, Jianwei Yang, Yajun Cai, Buyun Wang, Qi-An Peng
Summary: This study used ramie biochar (RBC) to activate nano zero-valent iron (nZVI) for enhanced removal of hexavalent chromium (Cr(VI)). The RBC-nZVI composite showed significantly higher efficiency in Cr(VI) removal compared to RBC or nZVI alone, due to a synergistic effect between RBC600 and nZVI on the reduction reaction of Cr(VI) and increased adsorption sites. This research provides a new approach for utilizing ramie waste and effectively addresses the limitations of nZVI for efficient and rapid Cr(VI) remediation.
Article
Environmental Sciences
Ke Zhao, Lu Yang, Linbo Qian, Yun Zhang, Jinyu Hou, Peter Christie, Wuxing Liu, Peishi Qi
Summary: Amorphous nano zero-valent iron modified by carboxymethylcellulose (CMC-AnZVI) was synthesized and shown to have high efficiency and capacity for the removal of hexavalent chromium and pentavalent vanadium. The addition of CMC affected the reactivity of the material without changing its crystallinity.
WATER AIR AND SOIL POLLUTION
(2022)