Article
Engineering, Environmental
Chao Gao, Jixue Sui, Kang Chen, Zongyuan Chen, Wangsuo Wu, Zhijun Guo
Summary: The study demonstrates that nZVI can effectively remove U(VI) from strongly alkaline solutions in anaerobic conditions, with a reduction efficiency of up to 95.5%, but the efficiency drops significantly in aerobic conditions due to oxidation and desorption processes. This offers new insights into the mechanisms of U(VI) interactions with nZVI in alkaline media and provides a potential approach for uranium recovery from spent nZVI.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Yilong Hua, Wei Wang, Nan Hu, Tianhang Gu, Lan Ling, Wei-xian Zhang
Summary: The core-shell structure of nanoscale zero-valent iron (nZVI) has been shown to provide multiplex solution and surface chemistry for reliable and high-efficiency enrichment and separation of uranium from low-level sources. Treatment of uranium-tailings wastewater in continuous-flow reactors resulted in reacted nZVI with high uranium content and treated wastewater with significantly reduced uranium concentration. This research further supports the cost-effective use of nanotechnology for pollution control and resource recovery.
ENVIRONMENTAL SCIENCE-NANO
(2021)
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
Engineering, Environmental
Yilong Hua, Donghan Li, Jinglan Zou, Wei Wang, Xiaoyan Wu, Xiaowen Zhang, Qing Liu, Guodong Zhao, Mi Li, Wei-xian Zhang, Jianping Yang
Summary: Uranium is a carbon dioxide free nuclear energy, but uranium-contained wastewater has negative health effects on humans. Nanoscale zero-valent iron (nZVI) has the ability to separate uranium from wastewater with high efficiency. The study investigates the transformation mechanisms of nZVI and its effect on uranium binding. The findings can help improve the remediation of uranium-contained wastewater using nZVI technology.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Xiaowen Zhang, Xudong Liu, Ying Peng, Xiaoyan Wu, Yujiao Tan, Qin Zeng, Zhijun Song, Mi Li
Summary: Coating a soluble Mg(OH)2 shell on nanoscale zero-valent iron (nZVI) particles can enhance their long-term reactivity and durability in groundwater, leading to more efficient uranium removal. The passivation shell erosion plays a crucial role in promoting synergistic adsorptive and reductive processes for U(VI) elimination by exposed Fe(0) core.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Edward Opong Acheampong, Ke Wang, Rui Lv, Sen Lin, Shiyong Sun, Yevgeny Aleksandrovich Golubev, Elena Leonidovna Kotova, Olga Borisovna Kotova
Summary: A nanoscale zero-valent iron composite functionalized by thiols (nZVI/Mt-SH) supported on montmorillonite was synthesized for uranium (IV) removal from water using a two-step co-precipitation method. SEM investigation confirmed the successful modification of nZVI/Mt morphology by (3-Mercaptopropyl) trimethoxysilane. The synergistic behavior between the SH-functionalized clay and iron nanoparticles contributed to the optimal adsorption efficiencies. Kinetic analysis indicated monolayer chemisorption, while the Weber-Morris model revealed a multi-phase removal process through intraparticle diffusion. The synthesized particles show promise as efficient adsorbents for removing U(VI) from contaminated water sources.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Environmental Sciences
Huiping Tang, Wencai Cheng, Yunpeng Yi, Congcong Ding, Xiaoqin Nie
Summary: Fe-0/APTES-GO composites show promising results in removing U(VI) due to the reducing activity of Fe-0 and abundant functional groups on the composites. Batch experiments demonstrate the effective removal of uranium by Fe-0/APTES-GO composites.
Article
Engineering, Environmental
Yang Ruan, Huimin Zhang, Zijing Yu, Zenghui Diao, Gang Song, Minhua Su, Li'an Hou, Diyun Chen, Shuao Wang, Lingjun Kong
Summary: The immobilization of uranium from wastewater by zero valent iron was studied in this work. A biochar supported nano zero valent iron was obtained and the uranium immobilization efficiency was enhanced to 99.9% in the presence of phosphate. The sequence of uranium, Fe/BC(900) and phosphate influenced the uranium immobilization efficiency.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Chen Chen, Xiaowen Zhang, Tianjiao Jiang, Mi Li, Ying Peng, Xudong Liu, Jian Ye, Yilong Hua
Summary: By successfully coating Mg(OH)(2) onto the surface of nZVI, the removal efficiency and stability of nZVI have been improved, enhancing the removal performance of U(VI). nZVI@Mg(OH)(2) is expected to play an important role in the in-situ remediation of U(VI).
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Jing Liu, Airong Liu, Jie Guo, Tao Zhou, Wei-xian Zhang
Summary: Modifications using different types of polyacrylamide (PAM) enhanced the sedimentation efficiency of nano zero-valent iron (nZVI) in a nano-iron reactor, improving processing capacity and maintaining reactivity for a longer period in wastewater treatment.
Article
Chemistry, Physical
Jian Zhang, Xiqiang Zhao, Wenlong Wang, Yanpeng Mao, Jing Sun, Zhanlong Song, Ping Zhou
Summary: This study systematically investigated the characteristics and mechanism of activated biochar and sulfide dual-modified nanoscale zero-valent iron electrocoagulation anode for efficient removal of the toxic chemical p-nitrophenol. The results showed that the modified nanoscale zero-valent iron anode exhibited higher electrocoagulation activity, with the sulfide-modified nanoscale zero-valent iron anode having the highest removal efficiency.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
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
Engineering, Environmental
Jian Wang, Congcong Liu, Hongwei Sun, Shaohui Wang, Xiaomei Liao, Lizhi Zhang
Summary: The study reveals that nanoscale zero-valent iron (nZVI) causes an increase in intracellular iron concentrations, leading to the production of high levels of endogenous reactive oxygen species (ROSs) and the oxidative damage of DNA, resulting in the inactivation of E. coli cells. The close contact between nZVI and E. coli leads to increased permeabilization of the cytomembrane and iron overload, which enhances the efficiency of E. coli inactivation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Tingyi Liu, Peng Wang, Zhong-Liang Wang
Summary: An effective complex of nanoscale zero-valent iron (NZVI) supported on zirconium 1,4-dicarboxybenzene metals-organic frameworks (UIO-66) was synthesized for efficient removal of V5+ from wastewater. The composite demonstrated strong oxidation resistance and a uniform dispersion of NZVI on UIO-66. V5+ could be quickly and completely removed in a wider pH range by the composite, except at pH = 1. The adsorption of V5+ on the composite followed a multi-layer heterogeneous adsorption mechanism, with an adsorbed amount of 397.23 mg V/g NZVI. The presence of nitrate inhibited the removal of V5+ by the composite. The mechanisms of vanadium elimination included physical adsorption, reduction, and co-precipitation, with reduction being the dominant mechanism. The composite showed good reusability after acid leaching.
Article
Environmental Sciences
Thunyalux Ratpukdi, Katika Intarasuwan, Panitan Jutaporn, Eakalak Khan
Summary: This study investigated the interactions between different NOM fractions and NZVI, finding that HPOA of GWNOM and HPIA of SRNOM exhibited the highest adsorption capacities. Bulk NOM fractionation after reaction with NZVI indicated that NOM not only adsorbed on NZVI, but also reacted and transformed into more hydrophilic and neutral compounds. This work sheds light on the reactivity between NOM and NZVI.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
