Study On Degradation Effect And Influencing Factors Of Naphthalene In Water By Trivalent Copper System

With the rapid development of society,antibiotics,drugs,endocrine disruptors and other emerging organic pollutants have been detected in the natural water environment.Naproxen（NPX）,as one of the non-steroidal anti-inflammatory drugs,has been detected in drinking water.However,it is difficult to remove it by conventional treatment methods.Therefore,the research on safer and more efficient wastewater treatment technology is the focus of current research.In this study,we will use the synthetic trivalent copper as the basis to investigate the treatment effect of NPX under different conditions and the acute toxicity of the degradation products under the condition of Cu（III）for the first time,so as to provide a new idea for the study of degradation of organic pollutants.The main achievements are as follows:（1）Degradation of NPX by Cu（III）system.Cu（Ⅲ）was synthesized by copper sulfate（CuSO4·H₂O₂）,potassium tellurite（K₂TeO₃）,potassium persulfate（K₂S₂O₈）and sodium hydroxide（Na OH）.The results show that there are two characteristic peaks at 270 nm and 405 nm,which indicates that the main substance in the red solution is Cu（Ⅲ）.Then,taking NPX as the target pollutant,Cu（Ⅲ）was used to degrade NPX,and the degradation efficiency of Cu（Ⅲ）was studied.The results show that the degradation efficiency of NPX can reach 80%at room temperature when the concentration of Cu（Ⅲ）is 0.01 mmol/L,NPX is 0.01 mmol/L and initial pH is 7.0.Me OH,TBA and FFA were used to scavenge free radicals.The results showed that Cu（Ⅲ）was the main oxidation active species in the system,and the degradation effect of NPX increased with the increase of Cu（Ⅲ）concentration;in addition,UV scanning results showed that Cu（Ⅲ）was difficult to exist in acidic condition,and the higher the pH was,the better the degradation effect of NPX was;however,the coexisting inorganic anions and natural organic matter had no significant effect on the degradation of NPX by Cu（Ⅲ）.In addition,in Cu（Ⅲ）system,the mineralization rate of NPX reaches 36.2%,and the acute toxicity of the intermediate indicates that its toxicity is less than that of the parent.Then Cu（Ⅲ）was used to degrade various pollutants.The results show that Cu（Ⅲ）has a good degradation effect on pollutants rich in electronic structure.It is speculated that Cu（Ⅲ）may be a single electron oxidant with high oxidation selectivity.（2）Degradation of NPX by Cu（III）/UV system.On the basis of Cu（III）alone,the degradation of NPX was further studied by the combination of Cu（III）and UV.The results show that when the UV power is 8W,the concentration of Cu（Ⅲ）is 0.01mmol/l,the concentration of NPX is 0.01 mmol/l,and the initial pH is 7.0,the degradation efficiency of NPX by Cu（Ⅲ）/UV system is about 92%.In addition,the free radical scavenging experiments show that Cu（Ⅲ）and ¹O₂ are the main oxidation substances in Cu（Ⅲ）/UV system.The results show that the more oxygen content in the solution,the better the degradation effect of NPX,and the degradation effect of NPX increases with the increase of UV power;inorganic anions still have no obvious effect on the degradation of NPX in Cu（Ⅲ）/UV system,but HA has inhibitory effect on the degradation of NPX,and the inhibitory effect is stronger with the increase of concentration;in the actual water samples,the degradation of NPX was slightly inhibited;the TOC removal rate of Cu（Ⅲ）/UV system was 58%,and the acute toxicity of NPX intermediate was similar to that of NPX parent.This study provides a new solution and theoretical support for refractory organic pollutants.