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, Physical
Zengqiang Ci, Yanxue Yue, Jingting Xiao, Xinshui Huang, Yubing Sun
Summary: This study demonstrated the removal mechanism of U(VI) on nZVI/clay composites through batch experiments, XPS analysis, and surface complexation modeling. The findings include the adsorption capacity, reduction process, and surface complexation reaction of U(VI) on nZVI/clay composites. These findings are crucial for the highly efficient removal of radionuclides in actual environmental remediation.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Hao Tang, Shu Zhang, Hongwei Pang, Jiaqi Wang, Xiangxue Wang, Gang Song, Shujun Yu
Summary: The novel MS@S-NZVI material designed in this study showed high dispersion and efficient adsorption capacity for U(VI) removal, with fast reaction equilibrium and high maximum adsorption capacity in water. Further research demonstrated its significant U(VI) removal rate in simulated wastewater systems, and XPS analysis identified adsorption and reduction as the main mechanisms of U(VI) removal.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Fenglei Liu, Miao Xiang, Anjie Wang, Chao Wang, Baowei Hu
Summary: In this study, a composite material (nZVI@SBA-15-PDA/PEI) loaded with nanoscale zero-valent iron (nZVI) was developed for the removal of Cr(VI) and U(VI). The maximum removal capacities were found to be 44.05 mg/g and 57.78 mg/g for Cr(VI) and U(VI) respectively. The elimination mechanism involved a two-step interaction process where the pollutants were first attached onto the composite materials and then reduced to U(IV) and Cr(III) by nZVI.
APPLIED SURFACE SCIENCE
(2021)
Review
Environmental Sciences
Qian Li, Zhongshan Chen, Huihui Wang, Hui Yang, Tao Wen, Shuqin Wang, Baowei Hu, Xiangke Wang
Summary: This article reviews the key advancements in different methods for the synthesis of NZVI and NZVI-based materials, and introduces different modification methods as well as the removal mechanisms of various organic pollutants. It discusses the interaction mechanisms between NZVI/NZVI-based composites and organic pollutants, providing a basis for future studies on developing more effective NZVI-based materials for wastewater treatment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
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, Environmental
Jituo Xie, Chao Lei, Wenqian Chen, Qianqian Xie, Qian Guo, Binbin Huang
Summary: The study found that transition-metal modified nanoscale zero-valent iron can effectively remove chlorophenols and Cr(VI) pollutants simultaneously, with the Pd/Fe bimetallic system performing the best. The enhanced catalytic activity of transition metal modified nZVI was attributed to the formation of nano-galvanic cells and atomic hydrogen species, which facilitated electron transfer and played a key role in triggering C-Cl bond cleavage.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Qiming Li, Meili Liu, Xuchun Qiu, Xiang Liu, Malcom Frimpong Dapaah, Qijian Niu, Liang Cheng
Summary: Carbonized melamine foam-supported nZVI composites were evaluated for efficient Cr(VI) removal. Fe@MF-12.5-800 exhibited the highest removal efficiency and remarkable stability at a neutral pH.
Article
Chemistry, Analytical
Ziyao Du, Bolin Li, Chao Jiang, Ruopei Sun, Suwen Chen
Summary: In this study, a metal-organic framework, UiO-66-NH2, was designed, synthesized and characterized. Functionalized materials UiO-66-Sal and UiO-66-MHBA were obtained by grafting Salicylaldehyde and 2,4-dihydroxybenzaldehyde onto UiO-66-NH2 via post-treatment. The effects of various factors on U(VI) adsorption were studied, with experimental results fitting well with pseudo-second-order kinetic equation and thermodynamic adsorption model.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(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, 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
Environmental Sciences
Yujie Mao, Yufang Tao, Xulin Zhang, Zhaopeng Chu, Xinyi Zhang, He Huang
Summary: Biochar-supported nanoscale zero-valent iron (800nZVI/BC) was used to efficiently remove Cr(VI) from wastewater. The material exhibited a high adsorption capacity and stability, with over 99% Cr(VI) removed within 30 minutes at pH 2. The removal process followed the pseud-second-order kinetics and Langmuir's adsorption model. The mechanism involved reduction reactions and complex formation on the surface.
WATER AIR AND SOIL POLLUTION
(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
Chemistry, Applied
Qianhong Gao, Minglei Wang, Jianchang Zhao, Mingxing Zhang, Dadong Shao, Jiangtao Hu, Guozhong Wu
Summary: An amidoxime-appended zirconium metal-organic framework was successfully fabricated for efficiently and rapidly removing uranium from aqueous solution. The adsorption process was found to be spontaneous and endothermic. The material showed high adsorption efficiency and selectivity towards uranium, making it a promising candidate for uranium removal in nuclear industry effluents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Environmental
Mohua Li, Yanbiao Liu, Fang Li, Chensi Shen, Yusuf Valentino Kaneti, Yusuke Yamauchi, Brian Yuliarto, Bo Chen, Chong-Chen Wang
Summary: The study introduced defects into hierarchical porous metal-organic frameworks (HP-MOFs) to improve their phosphate adsorption performance, using a template-assisted strategy to control the defects. Experimental results demonstrated the critical role of defect sites in enhancing phosphate uptake performance, providing a promising route for tailoring the adsorption performance of MOF-based adsorbents through defect engineering.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Editorial Material
Construction & Building Technology
Chunwen Xu, Xilian Luo, Chuck Yu, Shi-Jie Cao
INDOOR AND BUILT ENVIRONMENT
(2020)
Editorial Material
Construction & Building Technology
Junyan Yang, Yi Shi, Chuck Yu, Shi-Jie Cao
INDOOR AND BUILT ENVIRONMENT
(2020)
Article
Construction & Building Technology
Dong Xie, Chenhua Wang, Chuck W. Yu, Hanqing Wang
Summary: The study found that increasing the air supply speed of the purifier is an effective solution to reduce indoor radon pollution, especially when the purifier is placed in the middle of the room. Under mechanical ventilation conditions, the purification function is more effective when the air supply angle is 60 degrees.
INDOOR AND BUILT ENVIRONMENT
(2021)
Editorial Material
Construction & Building Technology
Joost van Hoof, Chuck Wah Yu
INDOOR AND BUILT ENVIRONMENT
(2020)
Article
Construction & Building Technology
Dong Xie, Chenhua Wang, Chuck Wah Yu, Yun Wang, Hanqing Wang
INDOOR AND BUILT ENVIRONMENT
(2020)
Article
Multidisciplinary Sciences
Liyuan Zhang, Junwei Su, Yu Huang, Qiyuan Wang, Renjian Zhang, Yunfei Wu, Yue Zhang, Yan Cheng, Yuanping He, Shuncheng Lee, Chuck Yu, Zhaolin Gu
SCIENTIFIC REPORTS
(2020)
Article
Construction & Building Technology
Wang Li, Hanqing Wang, Chengjun Li, Chuck Wah Yu
Summary: The heat radiation in a residential kitchen was simulated using CFD to evaluate the cooling effect of a radiant cooling ceiling panel and the pollution dispersion by the range hood and the air extraction system. The simulation results showed that the pollutant concentration in the kitchen during cooking was much lower than the Chinese standard criteria, and the radiant cooling in the ceiling played a significant role in maintaining a comfortable and healthy environment.
INDOOR AND BUILT ENVIRONMENT
(2021)
Article
Construction & Building Technology
Li Bai, Chunhui Li, Chuck Wah Yu, Zijian He
Summary: In recent years, air pollution in Northeastern China, specifically in Jilin Province, has been increasing due to coal burning and automobile emissions. By analyzing the data using ArcGIS, PCA, and non-carcinogenic risk models, it was found that pollutants have a temporal distribution trend of winter > spring > autumn > summer, with a spatial distribution decreasing from northwest to southeast. The main sources of air pollution were identified as coal-fired and automobile emissions.
INDOOR AND BUILT ENVIRONMENT
(2021)
Editorial Material
Construction & Building Technology
Xilian Luo, Yuexi Dang, Chuck Wah Yu, Zhaolin Gu
INDOOR AND BUILT ENVIRONMENT
(2021)
Editorial Material
Construction & Building Technology
Jianguo Wang, Shi-Jie Cao, Chuck Wah Yu
INDOOR AND BUILT ENVIRONMENT
(2021)
Editorial Material
Construction & Building Technology
Qiang Ye, Shunyi Wang, Chuck Wah Yu
INDOOR AND BUILT ENVIRONMENT
(2021)
Review
Construction & Building Technology
Chengjun Li, Hanqing Wang, Chuck Wah Yu, Dong Xie
Summary: The study found that the main acting forces for submicron aerosol particles include drag force, Brownian force, Saffman lift force, and thermophoresis force. Brownian force cannot be ignored when the particle diameter is below 0.3 µm, promoting irregular particle movement and enhancing diffusion ability. Smaller particle sizes, higher heat source temperatures, and lower initial particle velocities all lead to increased horizontal dispersity (D-H).
INDOOR AND BUILT ENVIRONMENT
(2022)
Article
Chemistry, Analytical
Chenhua Wang, Dong Xie, Xiaomin Yang, Hanqing Wang, Chuck Wah Yu
Summary: The study found that temperature difference and water content in concrete have significant effects on Rn-222 exhalation rate, with varying rates observed under different conditions.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Construction & Building Technology
Dong Xie, Yangxi Wu, Chenhua Wang, Chuck Wah Yu, Ling Tian, Hanqing Wang
Summary: This study investigated the indoor radon diffusion from building materials and found that ventilation strategies can effectively reduce indoor radon concentration and stabilize radon distribution, consequently minimizing occupants' exposure to high radioactive levels of radon in urban environments.
SUSTAINABLE CITIES AND SOCIETY
(2021)
Article
Construction & Building Technology
Chenhua Wang, Dong Xie, Chuck Wah Yu, Hanqing Wang
Summary: The study conducted an experimental evaluation on radon exhalation from concrete blocks, finding that an increase in sand content led to higher radon exhalation rate, while an increase in thickness and water content reduced the rate. Additionally, indoor radon concentration and effective dose were evaluated for concrete blocks with cover layers, showing that adding a cover layer could reduce both indoor radon concentration and the radon dose on exposure to occupants.
INDOOR AND BUILT ENVIRONMENT
(2021)