土壤中TNT的TiO2光催化降解动力学研究
TiO2 photocatalytic degradation kinetics of TNT in soil
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摘要: 为了高效修复受TNT污染的军事训练场地土壤,利用纳米TiO2光催化降解土壤中的TNT污染物,并采用高效液相色谱法测定降解后剩余的TNT含量.研究了光催化降解TNT的影响因素(如初始TNT浓度、pH、TiO2用量、土层厚度等)及其动力学规律.研究结果表明,加入TiO2催化剂后能将土壤中浓度为500 mg·kg-1 的TNT的去除率从36%显著提高到95%以上;另外,在土层厚度2用量为0.5wt%—3wt%的条件下,TNT的光催化降解符合拟一级动力学规律,且可用L-H模型描述;当催化剂用量为0.1wt%时,此时为零级反应.通过正交实验可知土层厚度大小对TNT的光催化降解影响最大.Abstract: In order to repair military training ground soil polluted by TNT efficiently, nanometer TiO2 was used in the photocatalytic degradation of TNT in the soil. High-performance liquid chromatography (HPLC) was used to analyze the content of TNT after the degradation. TNT degradation factors (such as initial concentration of TNT, initial pH, dosage of TiO2, soil thickness and so on) and degradation kinetics were investigated. The results show that, addition of TiO2 catalyst to the soil increased the degradation rate of TNT from 36% to more than 95% when the initial concentration was 500 mg·kg-1.Moreover, when the depth of soil was less than 8 mm and the amount of TiO2 was 0.5wt%—3wt%, the photocatalytic degradation of TNT is in accord with the pseudo-first order kinetics law, and can also be described by the L-H dynamic model.When the usage of the catalyst is 0.1 wt%, it's a zero order reaction. After the orthogonal experiments, it was found that soil thickness influenced the degradation of TNT most significantly.
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Key words:
- TNT /
- soil /
- TiO2 /
- photocatalysis /
- dynamics
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[1] RODGERS J D, BUNCE N J. Treatment methods for the remediation of nitroaromatic explosives[J]. Water Research, 2001, 35(9): 2101-2111. [2] 刘绮. 环境化学[M]. 北京: 化学工业出版社, 2004:7-8. LIU Q. Environmental chemistry [M]. Beijing: Chemical Industry Press,2004:7 -8 (in Chinese).
[3] 任毅.RDX和TNT及其同系物的电子结构和性能研究[D].武汉:武汉理工大学,2009 REN Y. RDX and TNT and its homologue of electronic structure and performance study[D].Wuhan: Wuhan University of Technology,2009(in Chinese). [4] 陈志铮,刘勇弟,化艳娇,等. 光催化氧化(UV + TiO2)法处理印染废水生化出水及其各类有机物去除[J].环境化学,2013,32(9):1792-1794. CHEN Z Z,LIU Y D,HUA Y J, et al. Photocatalytic oxidation degradation of bio-treated effluents of textile and dyeing wastewater and its removal efficiency of organic substances[J].Environmental Chemistry, 2013,32(9):1792-1794(in Chinese).
[5] 李明玉,赵倩,曾小龙,等. TiO2光电催化中光生电子降解对苯醌的行为研究[J].中国环境科学,2015,35(5):1397-1402. LI M Y,ZHAO Q,ZENG X L, et al. The behaviors of photoinduced electrons on the degradation of the p-benzoquinone in TiO2 based photoelectrocatalytic process.[J].China Environmental Science, 2015,35(5):1397-1402(in Chinese).
[6] 张文通,陈勇,陈超,等.纳米TiO2光催化材料在环境土壤修复中的应用研究进展[J].材料导报,2015,29(6):49-50. ZHANG W T,CHEN Y,CHEN C,et al. Utilizing nano-TiO2 as photocatalytic materials for environmental soil remediation[J].Materials Review, 2015,29(6):49-50(in Chinese).
[7] 韩世同,习海玲,史瑞雪,等.半导体光催化研究进展与展望[J].化学物理学报,2003,16(5):340-341. HAN S T,XI H L,SHI R X, et al. Prospect and progress in the semiconductor photocatalysis[J].Chinese Journal of Chemical Physics, 2003,16(5):340(in Chinese).
[8] LEWIS T A, NEWCOMBE D A, CRAWFORD R L. Bioremediation of soils contaminated with explosives [J]. Journal of Environmental Management, 2004, 70(4);291-307. [9] U.S.EPA.Nitroaromatics and nitramines by high performance liquid chromatography(HPLC) [S]. Method 8330A, 2007:1-28. [10] 谯华.TNT污染土壤的生物泥浆反应器修复机理研究[D].杭州:浙江大学,2013. QIAO H. Mechanistic investigation on bioremediation of TNT-contaminated soil by bioslurry reactor[D].Hangzhou:Zhejiang University,2013(in Chinese). [11] CLARK B, BOOPATHY R. Evaluation of bioremediation methods for the treatment of soil contaminated with explosives in Louisiana Army Ammunition Plant,Minden, Louisiana [J]. Journal of Hazardous Materials, 2007, 143(3), 643-648. [12] 刘忠珍,何艳,吴愉萍,等.土壤中丁草胺的吸附动力学[J].中国环境科学,2007,27(4): 493-497. LIU Z Z,HE Y,WU Y P, et al. The kinetics of butachlor sorption in soils[J]. China Environmental Science, 2007,27(4): 493-497(in Chinese).
[13] 郑红,汤鸿霄.有机污染物半导体多相光催化氧化机理及其动力学研究进展[J].环境科学进展,1996,4 (3): 15-18. ZENG H,YANG H X. Progress in mechanism and kinetics of the heterogeneous photocatalytic oxidationof organic contaminants on semiconductors[J]. Advances in Environmental Science, 1996,4 (3): 15-18(in Chinese).
[14] 程刚,王超,王晓娟.光催化反应器数学模型研究进展[J].化工进展,2009,28(2):183-185. CHENG G,WANG C,WANG X J. Recent progress of mathematical model of photocatalytic reactor[J]. Chemical Industry and Engineering Progress,2009,28(2):183-185(in Chinese).
[15] SON H S, LEE S J, CHO H, et al. Kinetics and mechanismof TNT degradation in TiO2 phomcatalysis[J].Chanosphere,2004, 57(4): 309-317. [16] 魏复盛.土壤元素的近代分析方法[M].北京:中国环境科学出版社,1992.:122-123. WEI F S. The modern analysis method of soil elements[M].Beijing: China Environmental Science Progress, 1992:122 -123(in Chinese).
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