利用固体类Fenton试剂降解五氯酚的探讨.pdf

2015,34(10):1914-1920
农业环境科学学报
2015年10月
Journal of Agro-ienvironment Science
利用固体类 Fenton试剂降解五氯酚的探讨
杨冰2, Pignatello Joseph J2,曲东
(1.西北农林科技大学资源环境学院,陕西杨凌712100;:2. Deparlnenl of Environmental Sciences, The Conneelicul Agricullural Fx
eriment Station, 123 Huntington Street. 1. O. Box 1106. New Haven, Connecticut 06504-1106, United States)
摘要:采用四种固体过氧化物(过氧化钙,CP;过硼酸钠,SPB;过碳酸钠,SPC;过氧化尿素,UIP以及I1O2和两种铁源
I(Fex(PO4)2利和 Fcso4l,通过室内模拟试验,研究不同过氧化物和Fc()源组合构成的(类 Fenlon反应对石英砂中五氯酚(IPC:P)的
降解能力,探讨了影响类 Fenton试剂活性成分有效性和持纮性的主要因素。结果表明,使用FeSO4为铁源,添加 GP SPB或SP℃使
体系pH快速升高至10~12,极大抑制了铁源有效性,仅在反应初期对PCP有快速降解,24h降解率分別为220%、14.6%和17.3%;
添加202或UHP对体系的pH无明显影响,24h降解率为86.5%和83.8%;但在24~48h,PCP降解均无明昴增加,表明活性成分
已殆尽。使用人工合成的纳米级Fe3(PO)4)2为铁源,能够持续稳定地提供Fe(I),在0~20d实验期间P(P均有持续降解,在20d时
CP、SPB、SPC:和UHP对PCP的降解率分别为30.1%、13.6%、8.6%、37.0%,H2O)2对PCP在16d时的降解率为56%、因此,使用致
碱性过氧化物作为类 Fenton试剂时,需要添加pH缓冲剂以提高对有机物的降解率;UHP在一定程度上可以替代HAO2。尽管固体
类 Fenton试剂对石英砂中PCP的去除率低于传统 Fenton试剂,但活性成分持续时间能由不到24h增加至20d以上,故在土壤污
染修复中具有更大潜力。
关键词:五氯酚;化学降解;固体过氧化物;铁矿物;顿反应
中图分类号:X703.1文献标志码:A文章编号:1672-2043(2015)10-1914-07doi:10.11654/jae.,2015.10.011
Decontamination of Pentachlorophenol Using Solid Ienton--like Reagents
YANG Bing", Iignatello Joseph J2, QU Dong
(1. College of Natural Resources and Environment, Northwest A&Funiversity, Yan ling 712100, China; 2. Department of Environmental Sci-
ences. The Connecticut Agricultural Experiment Station, 123 Iluntington Street, New Haven, Connecticut 06504-110, United States)
Abstract: In Ihis sludy, our Iypes of solid peroxides( calcium peroxide, C P; sodium pe. SPR:; sodium perearonale, SPC urea hydro-
gen peroxide UHP), H), and Iwo iron sourees Fe(Poa) and Fes.l were used lo investigale pentachlorophenol(PCP)degradation in sil-
ica sand slurries by Fenton-like reactions in incubation experiment. The main factors influencing the effectiveness and sustainability of ac
tive componcnts of Fenton-like reagents were explored. Adding CP, SPB or SPC quickly increased solution PH to 10-12 and significant.
inhibited Fe(I )effectiveness. However, 120 or UIIP showed little effect on solution pll. The rate of PCP degradation was 22.0%0, 14.6%
17. 39.86.5% and 83.8%. respe lively, for P, P, PC UHP and H with Fe$, as Fe(I )souree in 24 hours and no obvious rher
PCP degradation was observed rom 24 Io 48 hours. For Ireamenls with Fe (PO)2 as a sleady Fe(I) souree. however, PC P showed conlin
uous e radation uring 20 d experimen al period. Te CP e aaon ale ou the 20day was 30.1, 13.6%, 8.%ad 37.0%, for C
SPB, SPC and UIP, respectively. Applying I 02 resulted in 55.6% degradation of PCP in 16 days in Fe (PO4)2 Fenton reaction. The pre
sent results show that pll buffer is required for a better decontamination performance when using alkaline -inducing solid peroxides(CP,
SPI and SPC )as Fenton-like reagents. UIP might be an altemative for 112() .Solid Fenton-like reagents significantly extend active compo-
neuls"life time from less than 24 hours lo more Lhan 20 days, Lhus possessing greater potential for soil contamination remediation
Keywords: pentachlorophenol: chemical degradation; solid peroxide; iron mineral: Fenton reaction
收稿日期:2015-07-10
基金项目:国家自然科学基金面上项H(41171204); Nalional Institute of Food aund Auricullure,U.S. Department of Agricullure( Hutch program
作者简介:杨冰(1985一),男,四川南充市人,博上研究生,主要从事环境化学研究。F-m