Karla Y. Mora-Bonilla, Iván F. Macías-Quiroga, Nancy R. Sanabria-González, María T. Dávila-Arias
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引用次数: 1
摘要
本研究以钴离子(Co2+)为催化剂,用碳酸氢盐活化过氧化氢,研究了水溶液中紫外光AC (AR-AC)的降解。在复合中心设计(CCD)中分析了四个自变量(H2O2, NaHCO3, Co2+和染料浓度)。采用响应面法(RSM)对AR-AC降解进行了优化。在最佳降解条件(41.86 mg/L AR-AC, 5.58 mM H2O2, 2.00 mM NaHCO3, 9.00µM Co2+)下,脱色>矿化率(CO2转化率)为12.99%,总氮去除率为51.97%。3个响应变量的预测值与实验值一致,决定系数(R2)均大于0.9053。由于钴离子(Co2+)是水体的污染源,经氧化后吸附在钠基膨润土(Na-Bent)上,最终浓度为0.01 mg/L。碳酸氢盐活化过氧化氢是一种有潜力的染料废水处理技术,在碱性pH值和环境温度下运行。
Bicarbonate-Activated Hydrogen Peroxide for an Azo Dye Degradation: Experimental Design
The present study investigated the degradation of an aqueous Allura Red AC (AR–AC) solution by activating hydrogen peroxide with bicarbonate using cobalt ion (Co2+) as the catalyst. Four independent variables (H2O2, NaHCO3, Co2+, and dye concentrations) were analyzed in the composite central design (CCD). AR–AC degradation was optimized using the response surface methodology (RSM). Under optimal degradation conditions (41.86 mg/L AR–AC, 5.58 mM H2O2, 2.00 mM NaHCO3, and 9.00 µM Co2+), decolorization > 99.86%, mineralization (CO2 to conversion) of 12.99%, and total nitrogen removal of 51.97% were achieved. The predicted values for the three response variables were consistent with the experimental values, with determination coefficients (R2) greater than 0.9053. Because cobalt ions (Co2+) are a source of water pollution, after oxidation, these were adsorbed on sodium bentonite (Na–Bent), obtaining a final concentration of <0.01 mg/L. Bicarbonate-activated hydrogen peroxide is a potential technology for dye wastewater treatment that operates at an alkaline pH and at ambient temperature.