1. Enhanced adsorption/photocatalytic removal of Cu(Ⅱ) from wastewater by a novel magnetic chitosan@ bismuth tungstate coated by silver (MCTS-Ag/Bi2WO6) composite
- Author
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YaQi Peng, Zhao Chuanliang, Guohua Xing, Jiaojie He, ChengFeng Qian, Liwei Yang, and Bo Lai
- Subjects
Environmental Engineering ,Materials science ,Scanning electron microscope ,Health, Toxicology and Mutagenesis ,0208 environmental biotechnology ,Composite number ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,chemistry.chemical_compound ,Adsorption ,Tungstate ,Environmental Chemistry ,Fourier transform infrared spectroscopy ,0105 earth and related environmental sciences ,Aqueous solution ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,Pollution ,Copper ,020801 environmental engineering ,chemistry ,Photocatalysis ,Nuclear chemistry - Abstract
An easily separation composite, magnetic chitosan@bismuth tungstate coated by silver (MCTS-Ag/Bi2WO6), was successfully synthesized by the simple hydrothermal method. Moreover, the MCTS-Ag/Bi2WO6 demonstrated excellent adsorption/photocatalytic removal of Cu(II) in aqueous solution. Adsorption played a leading role in the synergistic reaction. The catalysts were characterized by fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscope (SEM). The effects on adsorption of Cu(II) were investigated, which included illumination, pH, and initial concentration. The experimental results showed that the theoretical maximum adsorption capacity of Cu(II) (181.8 mg/g) was achieved under simulated solar light irradiation with the optimal pH value of 6.0, indicating that illumination could enhance the adsorption of Cu(II) by MCTS-Ag/Bi2WO6. Meanwhile, the composite exhibited desirable adsorption ability of Cu(II) after 5 cycles. The copper ion adsorption fitted well with pseudo-second-order kinetic model and its isotherm followed Freundlich model.
- Published
- 2021