Performance and mechanism of UV/H2O2 synergistic system on oxidation and degradation of amino trimethylene phosphonic acid
In this study,an ultraviolet(UV)activated hydrogen peroxide(H2O2)system(UV/H2O2)with UV 185 nm as the light source was constructed to oxidize and degrade the scale inhibitor of amino trimethyl phosphonic acid(ATMP)in industrial wastewater.The oxidation and degradation of ATMP by UV,H2O2,and UV/H2O2 synergistic system were compared.The results showed that the UV/H2O2 system had a good performance on ATMP treatment and could effectively oxidize it to PO43-.The effects of UV wavelength,initial solution pH value,H2O2 concentration,reaction temperature,and coexisting substrates(SO42-,Cl-,NO3-,CH3COO-,and humic acid(HA))on the oxidation efficiency of ATMP to PO43-were investigated.The results indicated that when the initial concentration of ATMP was 0.1 mmol·L-1,the dosage of H2O2 was 5.0 mmol·L-1,and the initial solution pH was 7.0,UV/H2O2 synergistic system could lead to the production of 0.24 mmol·L-1 PO43-,as well as 80％ATMP removal at ambient temperature and 90 min reaction.Coexisting substrates of SO42-and Cl-had a promoting effect on the oxidation of AMTP at high concentrations(＞10.0 mmol·L-1).Coexisting substrates of NO3-,CH3COO-,and HA had inhibitory effects on the oxidation of ATMP,and this inhibitory effect gradually increased with increasing concentration.Furthermore,the reaction mechanism of UV/H2O2 oxidation of ATMP was studied.The radical quenching experiments proved that hydroxyl radicals(·OH)were the main active species for the oxidation of ATMP in the UV/H2O2 system,which was further confirmed by the analysis results of electron spin resonance(ESR)spectroscopy.The above research results can provide a reference for the treatment of wastewater containing ATMP.
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