title: [Influences of pH and complexing agents on degradation of reactive brilliant blue KN-R by ferrous activated persulfate].
abstract: The influences of pH and complexing agents on degradation of reactive brilliant blue KN-R by ferrous activated persulfate were investigated, and finally the complexed and the uncomplexed system were compared. Because the lower the pH the more quickly will be the dissociation of S2O8(2-) to the SO4(-*) and the ORP of the dominant radical SO4(-*) in the acidic condition is higher than the dominant radical *OH in the alkaline condition, KN-R degradation rates in acidic condition are far outweigh in the neutral and alkaline conditions. When pH value was 3, the residual rate of KN-R was 17.0% within 3 hours by EDTA system with the lowest PS consumption rate 32.3%, so EDTA was the best complexing agent choice in acidic condition. When pH value was 7, the residual rates of KN-R were 11.3%, 12.4% within 3 days by EDTA, citric acid system with the PS residual rates 28.9%, 28.0% respectively, so EDTA, citric acid were the better choices in the neutral condition. When pH value was 10, glucose acid, citric acid, EDTA and tartaric acid systems all had the similar KN-R degradation rates and PS residual rates, so all could acted as the complexing agents, when the system contained trace amounts of ferrous, the addition of complexing agent would greatly improve the degradation rate of pollutant, from original 52.5% to 79.3% of 3 d, so PS is suitable for in situ chemical oxidation (ISCO).
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China. 1010439791@qq.com
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhang
authors.forename: Jin-Quan
authors.initials: JQ
authors.lastname: Wan
authors.forename: Yong-Wen
authors.initials: YW
authors.lastname: Ma
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Ming-Zhi
authors.initials: MZ
authors.lastname: Huang
authors.forename: Ming
authors.initials: M
authors.lastname: Lan
mesh_terms: D001557:Benzenesulfonates / Q000737:chemistry / Q000302:isolation & purification*; D002614:Chelating Agents / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D013431:Sulfates / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D001557:Benzenesulfonates; D002614:Chelating Agents; D005296:Ferrous Compounds; D013431:Sulfates; D062065:Wastewater; C012036:sodium sulfate; C006796:brilliant blue