Photoelectrocatalysis Oxidation Of Arsenic（Iii） In Drinking Water By Cathodic Electrodeposition Synthesized TiO₂Oaded On Nickel Foam

In this paper, Through hot nitric acid and alkaline treatment on nickel foam, the good conductivity nickel foam was used as a carrier to load nano Zn/TiO2by cathodic electro deposition method, and nickel foam photocatalyst nano Zn/TiO2was formed to Photo catalytic oxidating As (Ⅲ).In the process, degreaser and nitric acid both approaches ware used in pre-treatment of nickel foam surface before loading Zn/TiO2through single factor experiment method to determine the factors affecting nickel foam Zn/TiO2cathodic electrodeposition, that the main concentration, surfactants, stabilizers and various process conditions such as stirring speed, pH, bath temperature, plating time, depending on the load capacity and catalytic properties to determine the optimum conditions:electrolyte composition of0.02mol/L sulfuric acid titanium oxide,0.1mmol/L zinc sulfate,0.2mol/L of sulfuric acid, O.lmol/L potassium nitrate,0.01mol/L30%hydrogen peroxide, with aqueous ammonia to adjust the pH of the electrolyte1.9. At room temperature under magnetic stirring speed of200r/min, the control operation voltage of2.5V deposition8-30min, a constant electric potential of the deposited cathode, the second electrode obtained by water washing after the muffle furnace and calcined at500℃1h, In this case of TiO2per gram of nickel foam quality is0.0725g.Obtained by the method Zn/TiO2film has strong absorption in the visible region, uniform coating, anatase type titanium oxide, a diameter of about16.3nm, high catalytic activity, TiO2nanoparticles with a solid surface with a foamed nickel, the film thickness of the load about16.3nm.By Zn/TiO2/Ni as adsorbent, adsorption of As (Ⅲ) and As (V), proposed a kinetic energy was found to better describe Zn/TiO2/Ni for As (Ⅲ) and As (V) in adsorption kinetics. Adsorption of As (Ⅲ) and As (Ⅴ) rate constants were1.268X10-2min-1and1.303X10-2min-1, pentavalent arsenic adsorption catalyst is stronger than the adsorption of trivalent arsenic.Use TiO2/Ni and Zn/TiO2/Ni be Photocatalyticoxidating As (Ⅲ) experimental results show that the description of the surface of TiO2particles loaded with nickel foam with a solid, long agitation are not falling. Photocatalyticoxidating As (Ⅲ), the oxidation of As (Ⅲ) is the main material for the superoxide radical, superoxide radical action in the light of further converted into hydroxyl radicals oxidizing As(Ⅲ). Significantly increase the photocatalytic efficiency. While negative bias from cathodic protection to avoid the dissolution of nickel substrate, the experiment optimum negative bias voltage of-0.4V, and found that the type of gas passed through the catalytic oxidation of the photoelectric As (III) conversion rate of almost no effect. Experiments As (Ⅲ) initial concentration of lmg/L, pH=7±0.05, photocatalyst dosage0.50g. Solid-liquid ratio of1.0g/L, light3h, applied-0.4V bias, As (Ⅲ) removal of up to92.6%.