紫外/过硫酸盐降解水中对氨基苯甲酸的研究
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摘要
采用紫外/过硫酸盐催化氧化工艺去除水中污染物对氨基苯甲酸(PABA),分析了过硫酸盐(PDS)投加量、溶液中不同阴离子、腐植酸(HA)投加量、不同pH以及不同真实水样等多种因素对该工艺的影响。结果表明,紫外/过硫酸盐工艺能有效去除PABA,去除率可达到99%。实验条件下,PABA去除率随着PDS投加量的增加而增大;反应过程中SO_4~-·对目标污染物的去除起主要作用,溶液pH和不同离子对PABA去除效果影响不大,而HA对PABA降解具有抑制作用。并且,紫外/过硫酸盐工艺对于真实PABA水样的处理也有很好的去除效果。
The UV/persulfate process was used to remove para-aminobenzoic acid(PABA).The effects of several factors such as dosage of persulfate(PDS),different anions in the solution,dosage of humic acid,different pH and different real water samples on PABA removal were investigated.The results show that the PABA removal efficiency could be significantly improved through the combination of the UV process and the PDS process.Under the experimental conditions,the removal rate of PABA increased with the increase of PDS dosage;pH and different ions had little effect on the final removal rate of PABA,while HA had inhibitory effect on PABA removal.Free radical quenching experiments shows that SO_4~-·plays a major role in the removal of the target contaminants during the reaction.Moreover,the UV/persulfate process is also very practical for the treatment of real PABA water samples.
The UV/persulfate process was used to remove para-aminobenzoic acid(PABA).The effects of several factors such as dosage of persulfate(PDS),different anions in the solution,dosage of humic acid,different pH and different real water samples on PABA removal were investigated.The results show that the PABA removal efficiency could be significantly improved through the combination of the UV process and the PDS process.Under the experimental conditions,the removal rate of PABA increased with the increase of PDS dosage;pH and different ions had little effect on the final removal rate of PABA,while HA had inhibitory effect on PABA removal.Free radical quenching experiments shows that SO_4~-·plays a major role in the removal of the target contaminants during the reaction.Moreover,the UV/persulfate process is also very practical for the treatment of real PABA water samples.
引文
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[7]Zhang Z,Feng Y,Liu Y,et al.Kinetic degradation model and estrogenicity changes of EE2(17a-ethinylestradiol)in aqueous solution by UV and UV/H2O2 technology[J].Journal of Hazardous Materia ls,2010,181(1-3):1127-1133.
[2]Allen J M,Gossett C J,Allen S F.Photochemical Formation of Singlet Molecular Oxygen(1O2)in Illuminated Aqueous Solutions of p-Aminobenzoic Acid(PABA)[J].Journal of Physical Chemistry B1996,32(1-2):33-37.
[3]Xue Y C,Dong,W B,Wang X N,et al.Degradation of Sunscreen Agent p-Aminobenzoic Acid Using a Combination System of UV Irradiation,Persulphate and Iron(Ⅱ)[J].Environmental Science and Pollution Research,2015,23(5):4561-4568.
[4]Soto-Vazquez L,Cotto M,DucongéJ,et al.Synthesis and Photocatalytic Activity of TiO2 Nanowires in the Degradation of p-Aminobenzoic Acid:A Comparative Study with a Commercial Catalyst[J].Journal of Environmental Management,2016,167(1):23-28.
[5]郭佑罗,关小红,高乃云,等.紫外-过硫酸盐工艺降解水中氯贝酸的研究[J].中国环境科学,2016,36(7):2014-2019.
[6]郭佑罗,高乃云,关小红,等.紫外激活过硫酸盐降解水中双氯芬酸钠[J].哈尔滨工业大学学报,2017,49(8):282-289.
[7]Zhang Z,Feng Y,Liu Y,et al.Kinetic degradation model and estrogenicity changes of EE2(17a-ethinylestradiol)in aqueous solution by UV and UV/H2O2 technology[J].Journal of Hazardous Materia ls,2010,181(1-3):1127-1133.