纳米复合材料
傅里叶变换红外光谱
扫描电子显微镜
材料科学
核化学
化学工程
催化作用
降水
解吸
纳米颗粒
光谱学
化学
纳米技术
吸附
复合材料
物理化学
有机化学
物理
工程类
气象学
量子力学
作者
Kobra Ayagh,Mehrdad Farrokhi,Jae‐Kyu Yang,Mehdi Shirzad‐Siboni
标识
DOI:10.1080/09593330.2021.1970822
摘要
Nowadays, nanoscale materials have been widely applied in the removal of contaminants from the water system. Reduction of Cr(VI) (as a poisonous species) to Cr(III) (as a slight toxic species) was performed using CuO-Kaolin with ultrasound (US) irradiation. The CuO-Kaolin nanocomposite was synthesized via a facile co-precipitation method. Then X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscope and Energy dispersive X-ray spectroscopy analyses were performed to identify the structural features of CuO-Kaolin. The role of influential parameters for the reduction of Cr(VI) was investigated in sonocatalytic advanced oxidation system. About 89.35% of Cr(VI) was removed via US/CuO-Kaolin process after 90 min at optimum conditions (pH = 3, sonocatalyst dosage = 1 g L-1 and [Cr (VI)]0 = 20 mg L-1). This outstanding result was due to the synergistic effect of the increased electron delivery to conduction band on CuO-Kaolin nanocomposite and the increased reactive surface region of nanoparticles by sonication. The presence of H2O2 as an amplifier improved the removal efficiency of Cr(VI) from 89.35% to 100% after 20 min. Kinetic experimental results were well described by a pseudo-first-order kinetic model. Desorption experiments showed excellent stability of sonocatalyst during the reaction and maintenance of the catalytic activity up to 10 sequential cycles.
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