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Plasmonic Ag-pillared rectorite as catalyst for degradation of 2,4-DCP in the H2O2-containing system under visible light irradiation

Chen, Yunfang, Fang, Jianzhang, Lu, Shaoyou, Wu, Yan, Chen, Dazhi, Huang, Liyan, Cheng, Cong, Ren, Lu, Zhu, Ximiao, Fang, Zhanqiang
Journal of hazardous materials 2015 v.297 pp. 278-285
X-ray diffraction, X-ray photoelectron spectroscopy, absorption, aqueous solutions, carbon, catalysts, cation exchange, hydrogen peroxide, irradiation, mineralization, nanomaterials, pH, photocatalysis, scanning electron microscopes, thermal degradation, transmission electron microscopes, transmission electron microscopy, wastewater
This study aims at photocatalytic degradation of 2,4-DCP with the assistance of H2O2 in aqueous solution by a composite catalyst of Ag-rectorite. The catalysts were prepared via a novel thermal decomposition method followed after the cation-exchange process. The synthesized nano-materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) surface analyzer, Ultraviolet–visible light (UV–vis) absorption spectra, field-emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM). The different mechanisms of degradation process with or without visible light irradiation were discussed, respectively. Moreover, the degradation efficiency of 2,4-DCP wastewater under Ag-rectorite/H2O2/visible light system was investigated by series of experiments, concerning on effects of major operation factors, such as H2O2 dosage and the initial pH value. The highest degradation rate was observed when adding 0.18mL H2O2 into 50mL 2,4-DCP solution, and the optimal pH value was 4 for the reaction. Afterwards, total organic carbon (TOC) experiments were carried out to evaluate the mineralization ratio of 2,4-DCP.