聚乙烯吡咯烷酮
光催化
扫描电子显微镜
材料科学
纳米颗粒
光降解
尖晶石
拉曼光谱
傅里叶变换红外光谱
试剂
核化学
煅烧
分析化学(期刊)
化学工程
化学
色谱法
纳米技术
催化作用
有机化学
光学
复合材料
高分子化学
冶金
工程类
物理
作者
Oussama Baaloudj,Noureddine Nasrallah,Mohammed Kebir,B. Guedioura,Abdeltif Amrane,Phuong Nguyen-Tri,Sonil Nanda,Aymen Amine Assadi
标识
DOI:10.1007/s11356-020-11716-w
摘要
CoBi2O4 (CBO) nanoparticles were synthesized by sol-gel method using polyvinylpyrrolidone (PVP) as a complexing reagent. For a single phase with the spinel structure, the formed gel was dried and calcined at four temperatures stages. Various methods were used to identify and characterize the obtained spinel, such as X-ray diffraction (XRD), scanning electron micrograph (SEM-EDX), transmission electron microscope (TEM), Fourier transform infrared (FT-IR), X-ray fluorescence (XRF), Raman, and UV-Vis spectroscopies. The photocatalytic activity of CBO was examined for the degradation of a pharmaceutical product cefixime (CFX). Furthermore, for the prediction of the CFX degradation rate, an artificial neural network model was used. The network was trained using the experimental data obtained at different pH with different CBO doses and initial CFX concentrations. To optimize the network, various algorithms and transfer functions for the hidden layer were tested. By calculating the mean square error (MSE), 13 neurons were found to be the optimal number of neurons and produced the highest coefficient of correlation R2 of 99.6%. The relative significance of the input variables was calculated, and the most impacting input was proved to be the initial CFX concentration. The effects of some scavenging agents were also studied. The results confirmed the dominant role of hydroxyl radical OH• in the degradation process. With the novel CoBi2O4/ZnO hetero-system, the photocatalytic performance has been enhanced, giving an 80% degradation yield of CFX (10 mg/L) at neutral pH in only 3 h.
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