Study On The Degradation Of 2-chlorophenol In Water By Ferrite-Containing Heterogeneous Light-Fenton Catalyst

Xinjiang have extremely rich coal resources.It is estimated that the total amount of resources is the first in China.Therefore,the development of coal chemical industry focusing on raw material-intensive is of great practical and strategic significance to people's livelihood construction,economic development of Xinjiang and even the maintenance of northwest national security.After the Central Xinjiang Working Symposium,relying on the advantages of policies and resources,some large-scale coal-related projects have developed rapidly in the short term.However,the impact on the fragile ecological environment and depleted water resources is accompanying.Wastewater from coal chemical industry contains many harmful substances such as phenol,sulfide,cyanide and ammonia nitrogen,among which chlorophenol?2-CPs?is the highest.Chlorophenol wastewater is difficult to degrade,highly polluting and toxic.How to treat chlorophenol wastewater efficiently is an urgent problem to be solved in the field of environmental pollution prevention and control.In this article,BiFeO₃,ZnFe₂O₄ and FeTiO₃ were prepared by sol-gel method,and their structures and morphologies were characterized by SEM,FT-IR,XRD and UV-vis.Through the catalytic degradation of 2-CP solution under light conditions,it is concluded that the prepared three substances have certain photocatalytic properties and even their properties are compared.The catalytic performance of the catalysts was studied,and the influence of different catalyst dosage,pH value and hydrogen peroxide dosage on Fenton-like effect of three iron-containing salts under high-pressure mercury lamp irradiation was investigated.The optimal conditions for BiFeO₃ were obtained as follows:100 mL 40 mg/L 2-CP solution,0.5 g/L catalyst,pH=7,and 0.05 mol/L H₂O₂.The degradation rate of 2-CP is reached 100%after 80min of illumination,which is the highest catalytic efficiency.The optimum conditions for ZnFe₂O₄ are:100 mL 40 mg/L 2-CP solution,0.5 g/L catalyst,pH=7,and 0.05 mol/L H₂O₂.The degradation rate of 2-CP is reached 48.48%after 120 min of illumination,which is the lowest catalytic efficiency.The optimal conditions for FeTiO₃ were as follows:100 mL 40mg/L 2-CP solution,0.4 g/L catalyst,pH=7,and 0.07 mol/L H₂O₂.The degradation rate of2-CP is reached 67.84%after 120 min of illumination,which showed a high catalytic efficiency.This article studied the apparent kinetics of the degradation of 2-chlorophenol by three heterogeneous iron salts under different pH conditions,and established the kinetic models of the degradation of 2-chlorophenol by three substances under different initial concentrations,and the corresponding parameters were obtained by curve fitting.The results show that the degradation of BiFeO₃ 2-CP conforms to the pseudo-first-order kinetic model under acidic and neutral conditions.At the lower the pH value,the larger the kinetic constant k_obs,the faster the reaction rate and the higher the coincidence degree of the model curve.However,the degradation of ZnFe₂O₄ and FeTiO₃ 2-CP basically conforms to the pseudo-first-order kinetic model.The lower the pH value,the larger the kinetic constant k_obs,the faster the reaction rate and the lower the coincidence degree of the model curves.