Abstract：Iron modified bentonite (FBT) was synthesized impregnation method and FBT activated urea peroxide (UHP) to degrade trichloroethylene (TCE). The optimal application method and mass ratio of FBT and UHP were optimized, and the effect of temperature on the degradation effect was analyzed. The FBT was characterized by XPS, FTIR, SEM and TEM. The main active substances were identified using electron paramagnetic resonance. Combined with the identification of intermediates by GC-MS, the possible reaction path was speculated. According to the results, TCE degradation was best when dried FBT particles were mixed with saturated urea peroxide solution. The optimal mass ratio for FBT and UHP is 1:1. After 24 hours, the residual percentage of TCE in the FBT/UHP system was about 7.4%, which was nearly 40% lower than in the BT/UHP system. As the main active substance, hydroxyl radical (·OH) contributed 88.6% to TCE degradation. Three intermediate products were identified:CH2Cl2, NH2CHO, (NH2)2CO, and one final product of oxidation, CO2.
张焱鑫,孙佳薇,席劲瑛,等.农药行业污染场地挥发性有机物释放能力及其评价方法研究[J].环境科学学报, 2022,42(3):450-456. Zhang Y X, Sun J W, XI J Y, et al. Study on the release ability of volatile organic compounds from contaminated sites of pesticide industry and its evaluation method[J]. Journal of Environmental Science, 2022,42(3):450-456.
[2]
李佳音,李伟芳,宁晓宇,等.某有机磷农药场地异味VOCs污染特征与关键致臭物质识别[J].环境化学, 2022,41(9):3075-3082. Li J Y, Li W F, Nin X Y, et al. Characteristics of odor and VOCs pollution in an organophosphorus pesticide site and identification of key odor causing substances[J]. Environmental Chemistry, 2022,41(9):3075-3082.
[3]
Donley N. The USA lags behind other agricultural nations in banning harmful pesticides[J]. Environmental Health, 2019,18(1):44.
[4]
孙宁,刘锋平,丁贞玉,等.我国污染地块安全开发利用模式与安全性评价方法[J].环境工程学报, 2022,16(6):1757-1763. Sun N, Liu F P, Din Z Y, et al. Safety development and utilization model and safety evaluation method of polluted land parcel in China[J]. Chinese Journal of Environmental Engineering, 2022,16(6):1757-1763.
[5]
Kan H, Wang T, Yu J, et al. Remediation of organophosphorus pesticide polluted soil using persulfate oxidation activated by microwave[J]. Journal of Hazardous Materials, 2021,401:123361.
[6]
Leonardos G, Kendall D, Barnard N. Odor threshold determinations of 53 odorant chemicals[J]. Journal of the Air Pollution Control Association, 1969,19(2):91-95.
[7]
权跃,吴昊,尹振浩,等.静态磁场对生物滴滤池强化的研究——以三氯乙烯废气的去除及细菌群落结构研究为例[J].中国环境科学, 2018,38(3):1099-1108. Quan H, Wu H, Yin Z H, et al. Study on the enhancement of biological drip filter by static magnetic field:Taking trichloroethylene waste gas removal and bacterial community structure as an example[J]. China Environmental Science, 2018,38(3):1099-1108.
[8]
Alharbi O M L, Basheer A A, Khattab R A, et al. Health and environmental effects of persistent organic pollutants[J]. Journal of Molecular Liquids, 2018,263:442-453.
[9]
谭竹.新余某化工厂污染场地土壤修复工程案例[J].广东化工, 2022,49(12):157-159. Tan Z. A case study of soil remediation engineering for contaminated site of a chemical plant in Xinyu[J]. Guangdong Chemical Industry, 2022,49(12):157-159.
[10]
Chen G, Hoag G E, Chedda P, et al. The mechanism and applicability of in situ oxidation of trichloroethylene with Fenton's reagent[J]. Journal of Hazardous Materials, 2001,87(1-3):171-186.
[11]
华洁,王敏,林舒婷,等. Fe3O4/FeS2活化H2O2降解典型苯胂酸类污染物[J].中国环境科学, 2021,41(6):2646-2656. Hua J, Wang J, Ling S T, et al. Fe3O4/FeS2 activates H2O2 to degrade typical benzene arsonic acid pollutants. China Environmental Science[J]. 2020,40(12):5280-5289.
[12]
Zhang Y, Han C, Zhang G, et al. PEG-assisted synthesis of crystal TiO2 nanowires with high specific surface area for enhanced photocatalytic degradation of atrazine[J]. Chemical Engineering Journal, 2015,268:170-179.
[13]
Yang T, Yu D, Wang D, et al. Accelerating Fe (Ⅲ)/Fe (Ⅱ) cycle via Fe (Ⅱ) substitution for enhancing Fenton-like performance of Fe-MOFs[J]. Applied Catalysis B:Environmental, 2021,286:119859.
[14]
侯琳萌,清华,吉庆华.类芬顿反应的催化剂、原理与机制研究进展[J].环境化学, 2022,41(6):1843-1855. Hou L M, Qing H, Ji Q H. Progress in research on catalyst, principle and mechanism of Fenton-like reaction[J]. Environmental Chemistry, 2022,41(6):1843-1855.
[15]
Luo H, Zeng Y, He D, et al. Application of iron-based materials in heterogeneous advanced oxidation processes for wastewater treatment:A review[J]. Chemical Engineering Journal, 2021,407:127191.
[16]
Bao T, Damtie M M, Hosseinzadeh A, et al. Bentonite-supported nano zero-valent iron composite as a green catalyst for bisphenol A degradation:Preparation, performance, and mechanism of action[J]. Journal of Environmental Management, 2020,260:110105.
[17]
Pluangklang C, Rangsriwatananon K. Facile method by bentonite treated with heat and acid to enhance pesticide adsorption[J]. Applied Sciences, 2021,11(11):5147.
[18]
Qin J, Ashworth D J, Yates S R, et al. Coupled use of Fe-impregnated biochar and urea-hydrogen peroxide to simultaneously reduce soil-air emissions of fumigant and improve crop growth[J]. Journal of Hazardous Materials, 2020,396:122762.
[19]
Varma R S, Naicker K P. The urea-hydrogen peroxide complex:Solid-state oxidative protocols for hydroxylated aldehydes and ketones (dakin reaction), nitriles, sulfides, and nitrogen heterocycles[J]. Organic Letters, 1999,1(2):189-192.
[20]
Tarla D N, Erickson L E, Hettiarachchi G M, et al. Phytoremediation and bioremediation of pesticide-contaminated soil[J]. Applied Sciences, 2020,10(4):1217.
[21]
Chen Q, Rao P, Cheng Z, et al. Novel soil remediation technology for simultaneous organic pollutant catalytic degradation and nitrogen supplementation[J]. Chemical Engineering Journal, 2019,370:27-36.
[22]
Wang C, Cao Y, Wang H. Copper-based catalyst from waste printed circuit boards for effective Fenton-like discoloration of Rhodamine B at neutral pH[J]. Chemosphere, 2019,230:278-285.
[23]
闫云涛,张柯,毛岩鹏,等.Fe2O3@SCe多相芬顿催化剂的制备及其降解放热性能[J].中国环境科学, 2020,40(8):3375-3384. Yan Y T, Zhang K, Mao Y P, et al. Preparation of Fe2O3@SCe heterogeneous fenton catalyst and its degradation exothermic performance[J]. China environmental science, 2020,40(8):3375-3384.
[24]
董家麟,付双,周昊,等.纳米过氧化钙对地下水中硝基苯的类-Fenton降解效果[J].中国环境科学, 2019,39(11):4730-4736. Dong J L, Fu S, Zhou H, et al. Effects of nano-sized calcium peroxide on degradation of nitrobenzene in groundwater by Fenton process[J]. China Environmental Science, 2019,39(11):4730-4736.
[25]
王柯晴,徐劼,陈家斌,等.氧基氯化铁非均相活化过-硫酸盐降解金橙Ⅱ[J].中国环境科学, 2020,40(8):3385-3393. Wang K Q, Xu J, Chen J B, et al. Heterogeneous activation of oxyferric chloride by persulfate for degradation of gold orange Ⅱ[J]. China environmental science, 2020,40(8):3385-3393.
[26]
Li C, Wu J, Peng W, et al. Peroxymonosulfate activation for efficient sulfamethoxazole degradation by Fe3O4/β-FeOOH nanocomposites:Coexistence of radical and non-radical reactions[J]. Chemical Engineering Journal, 356:904-914.
[27]
史鸿乐,汪诗翔,刘义青,等.亚铁改性沸石活化过氧乙酸降解水中双氯芬酸的研究[J].中国环境科学, 2020,40(5):2116-2123. Shi H L, Wang S X, Liu Y Q, et al. Enhanced degradation of diclofenac by catalytic peracetic acid using Fe2+ modified zeolite[J]. China environmental science, 2020,40(5):2116-2123.
[28]
桑林凤,苏珊珊,高紫崴,等.光助MIL-101(Fe)活化过氧化氢氧化洛克沙胂及同步吸附生成的砷酸根[J].中国环境科学, 2022,42(1):203-212. Sang L F, Su S S, Gao Z W, et al. Photoassisted MIL-101(Fe) activated hydrogen peroxide system for oxidative degradation of roxarsone and adsorption of in-situ formed arsenate[J]. China environmental science, 2022,42(1):203-212.
