Article
Engineering, Chemical
Leqi Shi, Qi Deng, Li Guo, Yaguang Du, Dongyun Du, Tian C. Zhang
Summary: In this study, a novel synthetic composite (S-nZVI@ECS) was prepared by loading sulfidized nanoscale zerovalent iron (S-nZVI) onto exhausted copper slag (ECS) for the removal of Cd(II), Cu(II), and Pb(II) from aqueous solutions. The composite provides a new idea for utilizing ECS and prevents S-nZVI particles from agglomerating. The optimized S-nZVI@ECS can efficiently remove the three heavy metals over a wide pH range without being affected by coexisting ions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Jingjing Ren, Liuchun Zheng, Yaoming Su, Peipei Meng, Qianya Zhou, Hao Zeng, Tao Zhang, Huajian Yu
Summary: Zero-valent iron/phosphoric titanium dioxide (PTO-3nZVI and PTO-nZVI) developed through phosphoric acid treatment and loading of zero valent iron showed excellent adsorption of heavy metals, especially Cd(II). Competitive adsorption occurred between Cd(II) and coexisting heavy metal ions, resulting in different adsorption effects for PTO-3nZVI and PTO-nZVI.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Ting-Ting Li, Zhike Wang, Hai-Tao Ren, Hao-Kai Peng, Xiao Zhang, Qian Jiang, Ching-Wen Lou, Jia-Horng Lin
Summary: This study introduces a novel adsorbent structure that enhances the strength of hydrogel for effective removal of Pb(II) and Ni(II). The composite hydrogel shows promising results in heavy metal ion removal, with excellent adsorption capacity and high removal rates even at low concentrations. The cost-effective and durable adsorbent opens up new possibilities for industrial applications of hydrogels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Weiyu Liang, Yihao Shen, Chen Xu, Dongqing Cai, Dongfang Wang, Kailun Luo, Xuechun Shao, Zhihua Qiao, Wei Zhang, Cheng Peng
Summary: A novel composite material was prepared for the removal of Cr and Cd from water and soil. The results showed that the composite material had high adsorption capacity and stability, and could simultaneously remove Cr and Cd. Cations promoted the adsorption, while anions and humic acid inhibited the adsorption.
ENVIRONMENTAL SCIENCE-NANO
(2022)
Article
Polymer Science
Francisco de Borja Ojembarrena, Sergio Garcia, Noemi Merayo, Angeles Blanco, Carlos Negro
Summary: This study focuses on the synthesis and characterization of BC membranes, and their application to remove Ni(II) and Pb(II) from wastewater. It was found that BC membranes have excellent adsorption properties for both metals, with Ni(II) removal mechanism involving crystallization and Pb(II) removal being driven by the adsorption process.
Article
Biotechnology & Applied Microbiology
Shengqiong Fang, Xiaoyi Huang, Shuangling Xie, Jiale Du, Jianlong Zhu, Kai Wang, Qinglin Zhuang, Xuan Huang
Summary: A novel biochar-loaded nano-zerovalent iron composite (nZVI@CMBC) was developed and applied for the removal of hexavalent chromium in wastewater. The results showed that the nZVI@CMBC composite had a high removal efficiency of Cr(VI) under acidic conditions, with a value of 124.12 mg g(-1).
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Review
Environmental Sciences
Xiao Wang, Yue Zhang, Zhiwei Wang, Chunhua Xu, Paul G. Tratnyek
Summary: Metal(loid) oxyanions in groundwater, surface water, and wastewater can have harmful effects due to their high toxicity and lack of degradation. Zerovalent iron (ZVI) has been widely studied for the removal of these contaminants, with mechanisms including redox reactions, adsorption, precipitation, and coprecipitation. The corrosion of ZVI leads to the formation of iron oxyhydrides that sequester metal(loid) oxyanions, contributing to their removal from different types of water sources.
Article
Polymer Science
Oanamari Daniela Orbulet, Annette Madelene Dancila, Simona Caprarescu, Cristina Modrogan, Violeta Purcar
Summary: The main objectives of this study were to immobilize nano zerovalent iron (nZVI) onto a polymeric material (Purolite A400) and synthesize the polymeric material (A400-nZVI) using sodium borohydride (NaBH4) reduction. The obtained A400-nZVI was used to remove nitrate ions from simulated groundwater. The polymeric materials, with and without nZVI (A400 and A400-nZVI), were characterized using FTIR, SEM-EDAX, XRD, and TGA analysis. The results confirmed the presence of nZVI on the polymeric material (A400). The adsorption capacity of A400-nZVI as a polymeric adsorbent was evaluated through kinetic and thermodynamic studies. The experimental results showed that nitrate ions reduction followed the pseudo-second-order kinetic model and Freundlich isotherm. A potential reaction mechanism was suggested based on the kinetic model results. A higher nitrate removal (>80%) was achieved under acidic conditions. The results indicate that the obtained A400-nZVI can be considered as a potential polymeric adsorbent for various pollutants in groundwater and wastewater.
Article
Environmental Sciences
Weichun Yang, Qi Li, Yuhong He, Dongdong Xi, Chukwuma Arinzechi, Xiaoming Zhang, Qi Liao, Zhihui Yang, Mengying Si
Summary: In this study, zerovalent iron-loaded hydroxyapatite (ZVI/HAP) was used to simultaneously adsorb Cr(VI), Cu(II), and Co(II) in multi-metal contaminated soil. The co-existing Cu(II), Ni(II), and Co(II) were adsorbed and precipitated onto ZVI/HAP, significantly improving the capture and reduction efficiency of Cr(VI). The application of ZVI/HAP resulted in the reduction of more than 99% of total Cr(VI) and the almost complete adsorption of Cu, Ni, and Co within 20 d.
Article
Environmental Sciences
Yijing Xu, Hongmei Tang, Pingxiao Wu, Meiqing Chen, Zhongbo Shang, Jiayan Wu, Nengwu Zhu
Summary: The serious pollution of water by lead (Pb(II)) and cadmium (Cd(II)) poses a significant threat to ecological safety and requires urgent solutions. In order to improve the adsorption performance of pure hydroxyapatite, which has a relatively low adsorption rate for heavy metals, a series of manganese-doped hydroxyapatites (MnHAPs) were prepared. The presence of manganese influenced the formation and growth of hydroxyapatite crystals, resulting in lattice distortion and a large number of lattice defects. MnHAP-10, with a Mn/(Ca +Mn) molar ratio of 10%, exhibited the most effective removal of Pb(II) and Cd(II), with adsorption capacities of 1806.09 mg g-1 for Pb(II) at pH = 5 and 176.88 mg g-1 for Cd(II) at pH = 5.5. The adsorption behavior and mechanism were further investigated, indicating that Pb(II) was immobilized mainly through dissolution precipitation and ion exchange, while Cd(II) was adsorbed by ion exchange and electrostatic interaction. In conclusion, MnHAP-10 has great potential as an effective adsorbent for the removal of Pb(II) and Cd(II) pollution.
Article
Environmental Sciences
Yanrong Lu, Hai Lin, Ye Zhang, Yingbo Dong
Summary: In this study, an environmentally friendly adsorbent, sodium lignosulfonate modified illite (LS-ILT), was prepared by hydrothermal modification. The adsorption behavior of Pb(II) and Cd(II) by LS-ILT and the effects of pH, sorbent dosage, and initial concentration were extensively investigated. The results showed that the adsorption of Pb(II) and Cd(II) followed quasi-second-order kinetics and the Freundlich model, with maximum adsorption capacities of 42.3 mg/g and 17.0 mg/g, respectively. The optimal conditions for adsorption equilibrium were a dosage of 4 g/L and a reaction pH of 5.5-5.8. LS-ILT exhibited better stability in Pb(II) adsorption compared to Cd(II), and the presence of coexisting cations did not significantly inhibit the removal of Pb(II) and Cd(II). Furthermore, LS-ILT met the ultra-low emission standard, maintaining over 50% adsorption capacity after four cycles, which has important implications for the treatment of wastewater with ultra-low concentrations of Pb(II) and Cd(II).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Xiaoqing Cai, Yinxia Wu, Yu Chuang, Chan He, Tiantian Shi
Summary: This study describes the use of bentonite-supported nanoscale zero-valent iron (B-nZVI) for simultaneous adsorption of Pb (II) and Ni (II) and compares it to single adsorbate situation. The effect of reaction conditions on adsorption efficiency and stability of B-nZVI after adsorbing heavy metals is investigated. In binary mixtures, competition for binding sites and interactions between B-nZVI and metal ions are identified. The adsorption efficiencies of Pb (II) and Ni (II) on B-nZVI are determined and the adsorption mechanisms are studied through various models.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Chemistry, Multidisciplinary
Israa Othman, Fawzi Banat, Shadi W. Hasan, Cyril Aubry, Sundaramurthy Suresh, Mika Sillanpaa, Mohammad Abu Haija
Summary: CuFe2O4 nanoparticles were synthesized and immobilized on sepiolite fibers and graphene oxide sheets to produce a CuFe2O4/sepiolite/GO (CFSG) nanocomposite. The synthesized CFSG nanocomposite showed good adsorptive removal of Pb-(II) and Cd-(II) heavy metal ions from aqueous solutions. The CuFe2O4 nanoparticles on the CFSG surface facilitated the adsorption process through electrostatic interaction and complexation processes.
Article
Engineering, Chemical
Jiankun Zhang, Xueyang Zhang, Jiaqiang Liu, Linjun Zhang, Hong Zheng
Summary: In this study, bentonite-supported nano zerovalent iron (B-nZVI) was prepared using natural bentonite as a carrier. The composite showed the structural characteristics of two materials and effectively removed Cr(VI) from water. The removal rate of Cr(VI) increased with decreasing pH and initial concentration, and increased with increasing B-nZVI dosage and reaction time. The removal of Cr(VI) by B-nZVI followed a pseudo-second-order reaction kinetic model.
DESALINATION AND WATER TREATMENT
(2022)
Article
Biochemistry & Molecular Biology
Zhiying Shao, Jilai Lu, Jian Ding, Fengjiao Fan, Xinyang Sun, Peng Li, Yong Fang, Qiuhui Hu
Summary: The synthesized chitosan-pectin gel beads showed excellent adsorption performance for removing heavy metals from water. With good structural characteristics, mechanical strength, and stability, CPBs were found to have great reusability and potential for environmental protection and reuse.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
