Zeng Guilu, Yang Rumin, Zhou Zhengyuan, Huang Jingyao, Danish Muhammad, Lyu Shuguang
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
Chemical Engineering Department University of Engineering and Technology (UET), Lahore (Faisalabad Campus), G.T. Road Lahore, Pakistan.
Chemosphere. 2022 Mar;291(Pt 2):132761. doi: 10.1016/j.chemosphere.2021.132761. Epub 2021 Nov 1.
The performance of naphthalene (NAP) degradation in peroxodisulfate (PDS) and peroxymonosulfate (PMS) oxidation systems by nano zero valent iron (nZVI) combined with citric acid (CA) activation was reported in aqueous solution and soil slurry medium. The results in aqueous solution tests indicated that 98.1% and 98.9% of NAP were individually degraded in PDS/nZVI/CA and PMS/nZVI/CA systems within 2 h when the dosages of PDS, PMS, nZVI and CA were 1.0 mM, 0.1 mM, 0.2 mM and 0.1 mM, respectively. The consequences of scavenging tests and electron paramagnetic resonance detection demonstrated that HO• and SO• were the key factors on NAP removal. The presence of surfactants could consume ROSs and inhibit NAP removal. In addition, GC-MS was applied for the determination of NAP degradation intermediates, and three possible NAP degradation pathways were proposed in PDS oxidation process and two pathways in PMS oxidation process, respectively. The results in soil slurry medium showed that the presence of CA could promote the dissolution of soil minerals and the desorption of NAP from soil medium. 93.5% and 96.8% degradation of NAP were obtained in PDS/nZVI/CA and PMS/nZVI/CA systems within 24 h. Besides, the existence of DOM in soil could promote Fe(II)/Fe(III) cycle and NAP degradation through electron transfer. Based on the NAP degradation performance in the actual groundwater and soil medium, the above findings could provide basis and strong support for the potential application of PDS/nZVI/CA and PMS/nZVI/CA systems in the remediation of NAP contaminated sites.
报道了在水溶液和土壤泥浆介质中，纳米零价铁（nZVI）与柠檬酸（CA）活化相结合，在过二硫酸盐（PDS）和过一硫酸盐（PMS）氧化体系中对萘（NAP）的降解性能。水溶液试验结果表明，当PDS、PMS、nZVI和CA的用量分别为1.0 mM、0.1 mM、0.2 mM和0.1 mM时，在PDS/nZVI/CA和PMS/nZVI/CA体系中，2小时内分别有98.1%和98.9%的NAP被降解。清除试验和电子顺磁共振检测结果表明，HO•和SO•是去除NAP的关键因素。表面活性剂的存在会消耗活性氧并抑制NAP的去除。此外，采用气相色谱-质谱联用（GC-MS）测定NAP降解中间体，分别提出了PDS氧化过程中三种可能的NAP降解途径和PMS氧化过程中两种途径。土壤泥浆介质中的结果表明，CA的存在可促进土壤矿物的溶解和NAP从土壤介质中的解吸。在PDS/nZVI/CA和PMS/nZVI/CA体系中，24小时内NAP的降解率分别达到93.5%和96.8%。此外，土壤中溶解性有机物（DOM）的存在可通过电子转移促进Fe（II）/Fe（III）循环和NAP降解。基于NAP在实际地下水和土壤介质中的降解性能，上述研究结果可为PDS/nZVI/CA和PMS/nZVI/CA体系在NAP污染场地修复中的潜在应用提供依据和有力支持。
