Article
Environmental Sciences
D. Prabu, P. Senthil Kumar, B. Senthil Rathi, S. Sathish, K. Vijai Anand, J. Aravind Kumar, Osama B. Mohammed, P. Silambarasan
Summary: This study established the potential of Fe3O4-BAC adsorbent by coating activated carbon with a nano adsorbent. The adsorbent exhibited superior magnetic behavior, high adsorption capacity, and removal efficiency under certain conditions.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Candelaria Tejada-Tovar, Angel Villabona-Ortiz, Rodrigo Ortega-Toro
Summary: This study demonstrated that bio adsorbents prepared from yam starch and plantain waste can effectively remove Cr (VI) and Ni (II) from aqueous solutions, with removal efficiencies above 80%. Temperature was found to have the most significant influence on Cr (VI) removal, while adsorbent dose and temperature were relevant factors for Ni (II) removal.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Environmental
Jennifer Jimenez-Paz, Juan Jose Lozada-Castro, Edward Lester, Orla Williams, Lee Stevens, Juan Barraza-Burgos
Summary: This study focuses on using activated carbons produced from Leather industry waste (LIW) to adsorb Cr(III) and Cr(VI) in leather wastewater. The results show that all activated carbons had a Cr(III) adsorption rate of over 95%. This research provides potential for reducing treatment costs and implementing a circular economy.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Jiahong Wu, Hamza Annath, Haili Chen, Chirangano Mangwandi
Summary: This study developed cost-effective bio-sorbent materials for heavy metal removal from wastewater using locally available tea wastes as precursors. The preparation methods of magnetic/non-magnetic tea waste-based adsorbents were discussed, and their properties were correlated with Cr(VI) adsorption capacity. The bio-sorbents were characterized by various techniques, and the Cr adsorption performance was investigated under different conditions. The tea waste-based bio-sorbents showed high efficiency in removing Cr.
Article
Chemistry, Analytical
Rupa Chakraborty, Renu Verma, Anupama Asthana, S. Sree Vidya, Ajaya Kumar Singh
Summary: The study showed that formaldehyde-modified sawdust has a good adsorption effect on Cr(VI) in wastewater, achieving a removal rate of up to 100%. The experimental data best fits the Freundlich adsorption isotherm model and pseudo-second-order kinetic model.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Feng Gao, Lei Zhang, Libin Yang, Xuefei Zhou, Yalei Zhang
Summary: Three types of graphene oxides (GOs) were prepared and used for the removal of Cr(VI). The adsorption performance of GOs was affected by initial concentration, pH, adsorbent dosage, contact time, and temperature. The adsorption mechanisms involved redox reaction, electrostatic attraction, pore filling, ion exchange, and complexation. The adsorption processes were mainly monolayer chemisorption and equilibrium could be reached in 30 min. The saturation adsorption capacities of GO-M1, GO-M2, and GO-M3 for Cr(VI) were estimated to be 3.5412 mg.g(-1), 2.3631 mg.g(-1), and 7.0358 mg.g(-1), respectively. The adsorption processes of Cr(VI) by GOs were endothermic, entropy-driven, and thermodynamically spontaneous and feasible. These findings provide important insights into the mechanism and application of Cr(VI) removal by GOs.
Article
Multidisciplinary Sciences
Maryam Bagherzadeh, Bagher Aslibeiki, Nasser Arsalani
Summary: In this study, Fe3O4/activated carbon nanocomposite was synthesized to remove Chromium from aqueous solutions. The Fe3O4 nanoparticles were decorated on vine shoots-derived activated carbon using the co-precipitation method. Atomic absorption spectrometer was used to evaluate Chromium ions removal. Various parameters were examined to find the optimum conditions. The synthesized nanocomposite showed a high ability to remove Chromium with a removal efficiency of 90% and an adsorption capacity of 305.30 mg/g at pH 3. Adsorption isotherms and kinetics were also studied, showing good fitting to Freundlich isotherm and pseudo-second-order model.
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Lingling Wang, Dionysios D. Dionysiou, Jianming Lin, Yuxian Huang, Xiaolan Xie
Summary: The research found that humic acid and Cr(VI) displayed synergy in their removal process by ZnO-30N-zeolite, accelerating the removal of humic acid significantly while not affecting the removal capacity of Cr(VI). This study proposed a kinetic mechanism for the synergistic removal of humic acid and Cr(VI) by ZnO-30N-zeolite in a binary pollutant system.
Article
Engineering, Environmental
Nur Shafiqah Jamaluddin, Nur Hashimah Alias, Sadaki Samitsu, Nur Hidayati Othman, Juhana Jaafar, Fauziah Marpani, Woei Jye Lau, Yong Zen Tan
Summary: Hexavalent chromium is a hazardous heavy metal that can cause severe effects on human health and the environment. In this study, delaminated MXene was successfully synthesized and used to efficiently remove hexavalent chromium from water through adsorption-assisted photocatalysis.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
James Friday Amaku, Segun A. Ogundare, Kovo G. Akpomie, Jeanet Conradie
Summary: ALU and KECA were used as adsorbents for the removal of toxic hexavalent chromium (Cr(VI)) from the aqueous phase. KECA showed a higher adsorption capacity and better reusability compared to ALU.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Vijayan Ramya, Devaraj Murugan, Chokkalingam Lajapathirai, Sivarajan Meenatchisundaram, Sivasamy Arumugam
Summary: Superparamagnetic nanoparticles/sludge biomass derived activated carbon composite was prepared and used for the removal of Cr (VI) from aqueous solution. The composite adsorbent had a large specific surface area and saturation magnetization, and showed high adsorption capacity for Cr (VI). The prepared composite adsorbent exhibited good stability and recyclability.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Sasireka Velusamy, Anurag Roy, Senthilarasu Sundaram, Tapas K. Mallick
Summary: In this study, the removal of Chromium (VI) from aqueous solution using CdS was investigated on an industrial scale, considering various factors and the best-fitting model. The results showed that CdS can effectively convert Chromium (VI) to non-toxic Chromium (III).
Article
Engineering, Chemical
Dongmei Jia, Zhaojing Jing, Yongzheng Duan, Jing Li
Summary: Polyamine modified carbon nanotubes (PA-CNTs) were synthesized for the removal of hexavalent chromium (Cr(VI)) from aqueous solution. The PA-CNTs exhibited rapid adsorption rate and high adsorption capacity for Cr(VI), and maintained good adsorption performance in the presence of other substances (e.g., Rhodamine B).
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Environmental Sciences
Sina Saeidi Varnamkhasti, Majid Riahi Samani, Davood Toghraie
Summary: Composites of PANI-leaves were synthesized and used to remove Chromium (VI) from aqueous environments. The highest percentage of Cr (VI) removal (40.3%) was achieved with the composite of cherry leaves and PANI. The synthesis conditions were further studied to enhance the removal efficiency.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Ruohan Zhao, Bing Wang, Xueyang Zhang, Xinqing Lee, Miao Chen, Qianwei Feng, Shiwan Chen
Summary: This study demonstrates the effective removal of Cr(VI) using the coal gangue-rape straw biochar (CG-RS) composite, providing a new approach for the resource utilization of solid waste.
