Nickle and Cobalt Spinel Catalyzing Wet Air Oxidation of Refractory Pollutants under Mild Condition

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Jing, Qi^1 ; Li, Huan^1

Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Graduate School at Shenzhen, Tsinghua University, Shenzhen

518055, China^1

关键词: Atmosphere pressure;    Catalytic performance;    Catalytic wet air oxidation;    Hierarchical architectures;    Reaction conditions;    Surface oxidations;    Total Organic Carbon;    X ray photoelectron spectra;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/2/012057/pdf
DOI  :  10.1088/1755-1315/295/2/012057

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Refractory organic pollutants are critical issues in water or wastewater treatemnt, and catalytic wet air oxidation (CWAO) is a common method. To improve the efficiency and decrease the reaction conditions, a type of NiCo2O4 (NCO) spinel with urchin-like hollow strucutres was synthesized and used in CWAO of organics at low temperature and atmosphere pressure. Both scanning electron microscopy and X-ray photoelectron spectra were used to characterize NCO. The 3-D hierarchical architectures, solid state redox couple M2+/M3+ (M represents Ni or Co), and plenty of surface oxygen species were proved. Furthermore, the reaction path of CWAO with NCO as the catalyst was concluded, i.e. consecutive adsorption, surface oxidation, and re-oxidation of reduced NCO by O2. NCO showed excellent catalytic performance in CWAO of refractory organics, such as alkaline lignin and bisphenol A. The removal rates of total organic carbon exceeded 80% within 3 h. These findings promise a convenient and economical way for the treatment of refractory organics in water or wastewater.