Article
Environmental Sciences
Pamphile Ndagijimana, Xuejiao Liu, Qingxin Xu, Zhiwei Li, Beibei Pan, Xu Liao, Yin Wang
Summary: In this study, a composite (nZVI/Ag@AC-RGO) consisting of AC, reduced graphene oxide (RGO), nanoscale zero-valent iron (nZVI), and silver (Ag) was successfully synthesized and characterized. The composite showed improved adsorption and degradation capability for trihalomethanes (THMs)-contaminated water remediation. The results indicated that the composite had good removal efficiency and adsorption capacity for THMs, and could effectively remove THMs through multilayer reaction processes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Feiyang Sun, Yuhuan Zhu, Xinyang Liu, Zifang Chi
Summary: In this study, nanoscale zero-valent iron supported by reduced graphene oxide (nZVI/rGO) was synthesized for the removal of Se(IV) from wastewater. The effects of different environmental conditions on the removal efficiency were investigated, and the reaction mechanism was further analyzed through characterization techniques.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Liang Dai, Kai Meng, Weifan Zhao, Tao Han, Zhenle Lei, Gui Ma, Xia Tian, Jun Ren
Summary: In this study, attapulgite-supported nano zero-valent iron (nZVI@ATP) was synthesized and used for Pb2+ remediation in aqueous solution. The adsorption performance of nZVI@ATP for Pb2+ was improved, and the mechanism included reduction, precipitation, and complex formation.
Article
Environmental Sciences
Liming Ren, Baoning Zong, Rui Zhao, Yulin Sun, Fanbin Meng, Ruoyu Wang
Summary: In this study, the mechanism of Cr(VI) contaminated aquifer remediation using nZVI@rGO was explored through experiments and characterization analysis. The results showed that the large reactive conjugated structure of rGO enhanced the electron transfer efficiency between Cr(VI) and nZVI@rGO, while the uniform accommodation of Cr(III) precipitates on rGO effectively retarded the surface passivation of nZVI.
ENVIRONMENTAL RESEARCH
(2022)
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
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, Environmental
Jun Ren, Gui Ma, Weifan Zhao, Ling Tao, Yue Zhou, Caiyun Liao, Xia Tian, Huan Wang, Kai Meng, Yongjie He, Liang Dai
Summary: In this study, a sulfide-modified attapulgite-supported nanoscale zerovalent iron (S-nZVI@ATP) composite was synthesized and found to have reduced oxidation and improved adsorption performance for Cd2+.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
He Gu, Yuquan Gao, Mengmeng Xiong, Daofang Zhang, Weifang Chen, Zhihua Xu
Summary: This study investigated the removal efficiency of nitrobenzene by nano zero-valent iron/graphene/biochar composite modified with graphene. The results showed that graphene modification enhanced the reduction capacity of the composite, increasing the removal efficiency by releasing electrons to attack nitrobenzene molecules.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Environmental Sciences
Zhibo Lyu, Wanting Liu, Zifang Chi
Summary: The reduced graphene oxide supported nanoscale zero-valent iron (nZVI/rGO) composite prepared in this study can effectively remove nitrate in groundwater, which is becoming a serious pollution issue. The in situ remediation of nitrate-contaminated aquifer was also investigated, showing promising results. The findings suggest that rGO/nZVI can remove nitrate mainly through physical adsorption and reduction processes, with a maximum adsorbing ability of 37.44 mg NO3--N/g. Moreover, the injected rGO/nZVI can create a stable reaction zone in the aquifer and continuously remove nitrate within 96 hours.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Emmanuella Anang, Hong Liu, Xianyuan Fan, Dongye Zhao, Xuan Gong
Summary: The study found that nFe(0) undergoes transformation during the reaction with chloro-organics, resulting in the formation of different iron oxides, and 2,4-DCP is rapidly dechlorinated to 2-CP, 4-CP, and phenol. Without the support of Ni and attapulgite, the transformation of nFe(0) and dechlorination of 2,4-DCP were not significantly achieved.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xiaosan Song, Xichen Song, Liang Dai
Summary: The performance and mechanism of sulfurized nano-zero-valent iron (S-nZVI) loaded onto acid-modified ATP with attapulgite (ATP) as the carrier (S-nZVI@ATP) for Pb2+ removal in water were studied. The results showed that S-nZVI@ATP has high reducibility, high surface activity, and good adsorption properties for Pb2+ removal.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Chemistry, Physical
Hongyang Ren, Daihuimei Xue, Dan Zhao, Wenhui Jin, Xingming Gong, Baoliang Peng, Bing Wang
Summary: In this study, cobalt-doped graphene-supported nanoscale zero-valent iron (GO/nZVI-Co) was successfully synthesized and applied for the degradation of difficult-to-degrade organics. Cobalt doping enhanced the adsorption properties of the material on H2O2, facilitating the contact reaction of zero-valent iron with H2O2.
Article
Engineering, Environmental
Mingyang Song, Xiaolei Hu, Tianhang Gu, Wei-xian Zhang, Zilong Deng
Summary: In this study, a nanocellulose-based composite, NC-nZVI, was developed for efficient removal of nickel. The nZVI was anchored to nanocellulose through a liquid-phase reduction method, resulting in varied morphology and dispersion status. Among the developed composites, CNC-nZVI showed the most evenly distributed nZVI particles. The binding between NC and nZVI was achieved through hydrogen bonds, electrostatic attractions, coordination-covalent bonds, and steric hindrance. The CNC-nZVI composite exhibited significantly higher removal efficiency of Ni2+ compared to bare nZVI, and remained effective under a wide pH range and in the presence of interference ions like NO3-, Cl-, and Ca2+. The observed hollow-out structure and Tafel extrapolation curves indicated that CNC activated diffusion path and accelerated electronic transfer from nZVI. The superior removal performance of NC-nZVI and the abundance of raw materials make it a promising material for environmental remediation and wastewater treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Analytical
Qian-Xin Bao, Yao Liu, Yue-Qing Liang, Rohan Weerasooriya, Heng Li, Yu-Cheng Wu, Xing Chen
Summary: In this study, a chemically modified glassy carbon electrode using tea polyphenols mediated zero-valent iron/reduced graphene oxide nanocomposites was developed for rapid determination of Hg2+ in water. The electrode showed optimal performance for Hg2+ determination and had no interference from other ions or chemical species commonly found in river water samples.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Chemical
Li Liang, Weiying Li, Yue Li, Wei Zhou, Jiping Chen
Summary: The study investigated the removal mechanisms of sulfidated nanoscale zero-valent iron (S-nZVI) towards EDTA-chelated CdII (CdII-EDTA) and the effects of critical factors on CdII-EDTA removal by S-nZVI. Results showed that S-nZVI had a high removal capacity for CdII-EDTA and the mechanism involved two-step replacement reactions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)