Preparation Of Nano-PAA-CuCl₂ Composite Film And Its Catalytic Activity For Degradation Of Organic Dye Contaminants

Recent years,an increasing number of organic pollutants have been discharged into natural environment along with the rapid development of industrialization process and improvement of human living standards,in which water pollution is closely related to human life.As the discharge of wastewater has gradually increased,the frequency of water pollution incidents has been increasing in various places,which means the situation of water pollution control has become increasingly serious.Nowadays,the wastewater is complex,concentrated,highly toxic,and poorly degradable.It can be said that it will seriously threaten people's life and health if the wastewater directly discharged into nature without appropriate treatment.Organic dye wastewater is one of the main water pollutants,and the conventional wastewater treating process exhibits poorly ability on the treatment of organic dye wastewater.Therefore,exploring new methods and technologies to deal with organic dye wastewater is still a hot issue for relevant practitioners.At present,main methods for treating organic dye wastewater include oxidation,adsorption,flocculation,electrochemistry,and biological methods.Advanced oxidation treatment technology is widely used in the treatment of organic dye wastewater due to its wide application range,high processing efficiency and low energy consumption.In the advanced oxidation treatment technology,the Fenton-like reaction not only has good degradation effect on the treatment of refractory organic dye contaminants,but also has unique advantages.Nevertheless,the Fenton-like reaction catalyst generally has the disadvantages of low catalyst stability and complicated preparation procedure.Therefore,it is highly demanded to develop a technology to prepare Fenton-like catalysts with high catalytic performance,wide pH range,good stability and reusability,and it is also a key technology to further improve the treatment efficiency of organic dye wastewater.In this paper,one kind of porous CuCl₂ film?Nano-PAA-CuCl₂?with controllable three-dimensional structure was synthesized on the top surface of nano-porous anodic alumina?Nano-PAA?by self-assembled method.The morphology and composition of nano-PAA-CuCl₂ film were systematically studied using FE-SEM,EDS,XPS,XRD and TEM.Then,the nano-PAA-CuCl₂ film was used as a Fenton-like reaction catalyst,which was mixed with H₂O₂ solution to form a heterogeneous Fenton catalytic system.The nano-PAA-CuCl₂/H₂O₂ catalytic degradation system was used to drive the heterogeneous Fenton reaction.Then,the main parameters affecting the degradation of Rhodamine B?RhB?were investigated in detail.Under the optimum experimental conditions,i.e.initial pH3.3,initial H₂O₂ concentration 1.4×10^-22 mol/L,nano-PAA-CuCl₂ generated with 5×10^-4mol/L precursor CuCl₂ solution,the nano-PAA-CuCl₂/H₂O₂ catalytic degradation system has excellent efficiency,and RhB was completely degraded 4 times continuously.In addition.the nano-PAA-CuCl₂/H₂O₂ catalytic degradation system has a wide pH range?2-8?when the Fenton-like reaction degrades the RhB solution,and the optimum value is5.8.Finally,the degradation mechanism was expounded,after the analysis of experimental data,the catalytic degradation process was verified that accorded with the pseudo first-order kinetic equation.In this paper,the research on the application of nano-PAA-CuCl₂ as catalyst to drive H₂O₂for Fenton reaction treatment of organic dye wastewater has practical application value:simple preparation method,economical,cost effective,stability,wide pH range and re-usability.