Article
Environmental Sciences
Yan Xu, Zheming Liu, Kexin Ma, Qingdong Qin
Summary: Nanoscale zero-valent iron (nZVI) based materials are considered as promising materials for groundwater remediation. An improved synthesis method was developed, which increased the iron content and utilization of reactants, leading to improved performance of the material.
Article
Engineering, Environmental
Yingying Xie, Guining Lu, Xueqin Tao, Zhen Wen, Zhi Dang
Summary: A novel collaborative strategy using nano zero valent iron (nZVI) assisted by schwertmannite (Sch) was designed for enhanced removal of Cr(VI). Batch experiments showed that nZVI/Sch-AP had better removal performance for Cr (VI) than nZVI/Sch-CO. The study provides new insights into the elimination of Cr(VI) from wastewater by nZVI/Sch, especially in acid mine drainage.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Chemical
Liying Ma, Yaguang Du, Shaohua Chen, Fen Zhang, Wei Zhan, Dongyun Du, Tian C. Zhang
Summary: The study explores the efficient reduction/removal of high concentration of hexavalent chromium [Cr(VI)] by coupling nZVI with MR-1, with optimal experimental conditions identified for maximum removal efficiency. The addition of MR-1 is shown to promote dissolution of the passivation layer on the nZVI surface, significantly improving Cr(VI) reduction/removal efficiency. This method may have great potential for reduction and detoxification of Cr(VI) in aqueous environments.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Yujun Cheng, Haoran Dong, Tianwei Hao
Summary: In this study, calcium carbonate coated nanoscale zero-valent iron (C-nZVI) was synthesized for Cr(VI) removal. The water chemistry had an influence on C-nZVI reactivity, with NO3 showing a positive effect on C-nZVI contrary to its influence on nZVI.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Xiaowei Xing, Xuemei Ren, Njud S. Alharbi, Changlun Chen
Summary: In this study, biochar (BC) -supported Fe/Ni bimetal nanoparticles (BC@Fe/Ni) were developed to increase the reactivity of Fe0 and promptly remove Cr(VI) from water. The results showed that the mesoporous structure of BC reduced the aggregation of Fe0, and the removal efficiency of BC@Fe/Ni was better than BC and Fe/Ni. The presence of Ni promoted the formation of Fe(II) and H atoms.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Environmental Sciences
Ruiming Zhang, Rossana Napolano, Beidou Xi, Anne Millicent Salazar, Qiantao Shi, Ying Zhao, Xiaoguang Meng
Summary: Recent studies have found that the combination of zero-valent iron (ZVI) and pyrite (FeS2) can effectively remove Cr(VI) from water. This study discovered that dissolved oxygen (DO) plays a crucial role in enhancing the removal efficiency. The presence of DO led to the oxidation of pyrite, producing protons that promote ZVI corrosion and creating dissolved sulfide, which improves the removal of Cr(VI) by forming ferrous sulfide precipitates on the ZVI surface.
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
Chemistry, Physical
Qi Zhang, Yangyang Wang, Zheng Wang, Zhijie Zhang, Xiaodong Wang, Zhenglong Yang
Summary: The study successfully synthesized the A-BC-NZVI composite and achieved certain results in removing heavy metal uranium from sewage water. The experimental results showed that A-BC-NZVI has significant adsorption and reduction effects on U(VI).
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
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
Liying Ma, Yaguang Du, Shaohua Chen, Dongyun Du, Hengpeng Ye, Tian C. Zhang
Summary: The study successfully synthesized a novel composite, nZVI supported by pinecone biochar (nZVI-PBC), which showed enhanced removal performance for high concentration Cr(VI) in the presence of Shewanella oneidensis MR-1.
Article
Engineering, Environmental
Chuanyu Qin, Jingyi Zhang, Chengwu Zhang, Yu He, Paul G. Tratnyek
Summary: The study found that zero valent iron can degrade nitrobenzene through both reduction and advanced oxidation under oxygen-limited conditions. The contribution of center dot OH to the degradation of nitrobenzene increases with time, with reduction remaining the main pathway of transformation. The balance between ZVI, dissolved oxygen, and iron-complexing ligands is crucial for the optimal removal of organic contaminants.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Zhuang Tong, Qin Deng, Shengxu Luo, Jinying Li, Yong Liu
Summary: A water treatment system for the removal of heavy metal ions such as Cr(VI) has been developed, based on the immobilization of nano zero-valent iron (nZVI) on seashell powder. Under optimal conditions, the nZVI-loaded seashell powder showed a 79% increase in the removal efficiency of Cr(VI) compared to free nZVI. This study is expected to contribute to the development of environmental remediation materials using bioresource waste.
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
Ozlem Oral, Aynur Yigit, Cetin Kantar
Summary: This study investigates the application sequence of pyrite and zero-valent iron (Fe0) on chromium (VI) removal. The results show that batch reactors achieve higher Cr(VI) removal efficiency compared to sequential batch reactors due to the differences in Fe redox cycling activities. Pyrite serves as a support material for Fe0, stimulating Fe redox cycling and enhancing Cr(VI) removal. In sequential batch reactors, Fe redox cycling activity is limited but can be increased with higher pyrite doses.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Jiaxin Wen, Wenyang Fu, Shihu Ding, Ying Zhang, Wei Wang
Summary: In this study, pyrogallic acid was introduced into the synthesis process of nanoscale zero-valent iron, leading to the creation of a new catalyst called pyrogallic acid-nanoscale zero-valent iron (pyGA-nZVI). The material successfully removed Cr(VI) with high efficiency, especially in a wide pH range. The modification of pyrogallic acid improved the electron transfer of nZVI and reduced the charge transfer resistance. This research provides a new strategy for utilizing polyphenols to synthesize highly reactive nZVI for Cr(VI) removal.
CHEMICAL ENGINEERING JOURNAL
(2022)