Huifang Lei, Nora F. Y. Tam, Xinhua Geng, Meiling Zhong, Xiaolan Lao, Xiaotong Su, Xuexia Huang, Lezhang Wei, Yu Liu, Qihang Wu, Ying-heng Fei, Dinggui Luo, Tangfu Xiao
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引用次数: 0
Abstract
Acidic wastewater from mining activities contains a large amount of Sb(III). Biochar can provide with an economical and efficacious method for removing of Sb(III). However, highly efficient removal was still challenging under acidic environment. In this study, bamboo charcoal biochar and rice straw biochar were modified with glutaraldehyde and chitosan to examine their Sb(III) adsorption performances in terms of adsorption isotherms, adsorption kinetics and thermodynamics under different treatment conditions, i.e. biochar dosages, pH values, adsorption durations, coexisting substances and temperatures. Characterizations including Brunauer–Emmett–Teller surface area analysis, Fourier transform infrared spectrometry, scanning electron microscope coupled with energy dispersive X-ray spectrometry as well as X-ray photoelectron spectroscopy were employed to further reveal the mechanisms. Results showed that the modified bamboo biochar and modified rice straw biochar showed excellent Sb(III) adsorption efficiency of 94.29% and 93.36%, respectively, under strongly acidic environment. The maximum Sb(III) adsorption capacities of the modified bamboo biochar and modified rice straw biochar reached to 81.16 mg/g and 72.92 mg/g, respectively. Langmuir adsorption isotherm model and quasi-secondary kinetic model best described the adsorption processes. Thermodynamic studies showed that the adsorption of Sb(III) by modified biochar was a spontaneous, exothermic and irreversible process. It was proposed that electrostatic attraction, complexation with functional groups (e.g., C = O, -NH2, -OH), as well as oxidation of Sb(III) were involved in the adsorption processes. The modified biochar has greater removal capacity for Sb(III) than pristine one, suggesting its potential applications for the wastewater treatment.
期刊介绍:
Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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