Effect of chelating agents on Reactive Green 19 decolorization through Fe0-activated persulfate oxidation process.
Effect of chelating agents on Reactive Green 19 decolorization through Fe0-activated persulfate oxidation process.
复制标题
DOI：
10.1016/j.jenvman.2017.05.089
复制
发表时间：
2017-09
影响因子：
8.7
通讯作者：
Feng Ding;H. Chen;Sida Zhang;Tongjun Zhao;Na Liu
中科院分区：
文献类型：
--
作者：
Feng Ding;H. Chen;Sida Zhang;Tongjun Zhao;Na Liu
研究了螯合剂对Fe 0活化过硫酸盐（PS/Fe 0）对活性绿色19（RG 19）脱色的影响。虽然已有研究表明螯合剂可以促进类Fenton体系中有机污染物的降解，但我们的研究结果表明，螯合剂的存在会螯合游离Fe 2+，使游离Fe 2+浓度最小化，从而导致RG 19脱色的延迟。在柠檬酸钠、EDTA钠和草酸钠的存在下，与对照试验（无螯合剂，99%）相比，RG 19脱色在10分钟内降低至7%、21%和15%。随着螯合剂浓度的增加，降解效率降低，因为与Fe 2+形成络合物。较高的PS浓度、Fe 0投加量和温度对RG 19的脱色率有明显的提高作用。对含EDTA钠的RG 19降解途径的解析表明，PS/Fe 0工艺能有效地将RG 19降解为羧酸和无机盐。EDTA钠的存在对副产物没有影响，EDTA只是起到螯合剂的作用，螯合铁离子。
The effect of chelating agents on the decolorization of Reactive Green 19 (RG19) through Fe0activated persulfate (PS/Fe0) process was investigated. Though other previous studies reported that chelating agent can enhance the degradation of organic contaminant in Fenton-like system, our finding showed that the presence of chelating agents would chelate free Fe2+and minimize free Fe2+concentration, which resulted in the retardation of RG19 decolorization. RG19 decolorization decreased to 7%, 21%, and 15% in the presence of sodium citrate, sodium EDTA, and sodium oxalate, compared with control test (without chelating agent, 99%) within 10 min. The degradation efficiencies decreased with increasing chelating agent concentrations because of complex formation with Fe2+. Higher PS concentration, Fe0dosage, and temperature had an obvious enhancement for RG19 decolorization efficiency. Elucidation of RG19 containing sodium EDTA degradation pathways indicated that PS/Fe0process could degrade RG19 to carboxylic acids and inorganic salts efficiently. The presence of sodium EDTA had no influence on by-products, and EDTA just played a chelating agent function for chelating Fe ions.