作者：车凯¹, 曾四鸣¹, 杨鹏², 范辉², 罗蓬¹, 郁金星¹, 陈二松¹

作者单位：1. 国网河北省电力有限公司电力科学研究院，河北 石家庄 050021;
2. 国网河北省电力有限公司，河北 石家庄 050021

关键词：绝缘油;土壤;光催化;石墨相氮化碳;二氧化钛

摘要：

利用尿素与TiO₂制备g-C₃N₄/TiO₂光催化复合材料，并进行表征分析。然后针对绝缘油污染土壤进行光催化降解实验，考察不同光源、降解时间、催化剂用量、绝缘油初始浓度以及含水量对土壤中绝缘油降解效果的影响。结果表明：g-C₃N₄/TiO₂催化剂复合效果较好，光催化降解对土壤中绝缘油污染有良好的去除效果，在汞灯照射下，使用TiO₂催化剂效果略好，40 h降解率达到41.77%，氙灯照射下整体催化效果要优于汞灯照射，尤其是使用g-C₃N₄/TiO₂催化剂，土壤中绝缘油去除率明显提高，40 h时降解率达到77.67%。光催化效果随着绝缘油初始浓度的提高而下降，绝缘油浓度由0.5%提升至2%时，去除率由85.27%降至59.09%；随着催化剂用量的增加，绝缘油的整体降解率均有不同程度提高，在实验初期表现尤为明显；土壤中初始含水率在光催化反应初期对土壤中绝缘油去除率具有负面影响，含水量越高去除率越低，而随着水分不断挥发，24 h后初始含水量对降解速率已无影响。

Photocatalytic degradation of insulating oil in soil by g-C₃N₄ /TiO₂ composite catalyst
CHE Kai¹, ZENG Siming¹, YANG Peng², FAN Hui², LUO Peng¹, YU Jinxing¹, CHEN Ersong¹
1. State Grid Hebei Electric Power Company Electric Power Research Institute, Shijiazhuang 050021, China;
2. State Grid Hebei Electric Power Company, Shijiazhuang 050021, China
Abstract: The g-C₃N₄/TiO₂ photocatalytic composite was prepared by urea and TiO₂, and the characterization analysis was carried out. Then, photocatalytic degradation experiments were carried out for insulating oil contaminated soil, and the effects of different light sources, degradation time, catalyst dosage, initial concentration of insulating oil and water content on the degradation effect of insulating oil in soil were investigated. The results show that: The combined effect of g-C₃N₄/TiO₂ catalyst is better, and the photocatalytic degradation has a good removal effect on the pollution of insulation oil in the soil. Under the irradiation of mercury lamp, the effect of TiO₂ catalyst is slightly better, and the degradation rate reaches 41.77% at 40 h. The overall catalytic effect of xenon lamp irradiation is better than that of mercury lamp irradiation, especially the use of g-C₃N₄/TiO₂ catalyst. The removal rate of insulating oil in soil increased obviously, and the degradation rate reached 77.67% at 40 h. The photocatalytic effect decreased with the increase of the initial concentration of insulating oil. When the concentration of insulating oil increased from 0.5% to 2%, the removal rate decreased from 85.27% to 59.09%. With the increase of catalyst dosage, the overall degradation rate of insulating oil increased, especially in the initial stage of the experiment. The initial water content in the soil has a negative effect on the removal rate of insulating oil in the soil at the initial stage of photocatalytic reaction, and the higher the water content is, the lower the removal rate is. However, with the continuous evaporation of water, the initial water content has no effect on the degradation rate after 24 h.
Keywords: insulating oil;soil;photocatalytic;g-C₃N₄;TiO₂
2022, 48(10):25-31  收稿日期: 2022-02-08;收到修改稿日期: 2022-03-28
基金项目: 国家电网公司科技项目(5204DY19000A)
作者简介: 车凯（1985-），男，河北石家庄市人，高级工程师，硕士，主要从事电力环保工作的相关研究
参考文献
[1] 刘佳. 废变压器油中污染物及环境风险评价研究[D]. 保定: 华北电力大学, 2015.
[2] 廖瑞金, 郝建, 杨丽君, 等. 变压器油纸绝缘热老化过程中铜类产物生成规律及其危害[J]. 电工技术学报, 2012, 27(10): 52-59
[3] 李佳, 曹兴涛, 隋红, 等. 石油污染土壤修复技术研究现状与展望[J]. 石油学报(石油加工), 2017, 33(5): 811-833
[4] 车凯, 郁金星, 刘松涛, 等. 河北南部变电站场地土壤中PAHs含量、来源及健康风险[J]. 中国环境科学, 2020, 40(11): 4865-4874
[5] 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(11): 49-54
[6] 朱派金, 张艺莹, 许淑霞. 基于石墨相碳化氮的光催化降解有机污染物研究进展[J]. 中国测试, 2018, 44(11): 135-141
[7] 林浩忠. 十溴联苯醚在土壤中的迁移分布及在土壤悬液中的光降解研究[D]. 广州: 华南理工大学, 2018.
[8] 张洁. g-C₃N₄模拟太阳光催化降解苯甲酰脲类农药的研究[D]. 太原: 山西大学, 2019.
[9] 蒋燕, 柴超, 陈清华. TiO₂光催化降解去除土壤中荧蒽研究[J]. 环境科学与技术, 2019, 42(7): 131-135
[10] 肖俊霞, 彭惠玲, 王淑静, 等. TiO₂光催化氧化技术在土壤修复中的研究与发展[J]. 环境与发展, 2017, 29(4): 150-152
[11] 冯胜雷, 刘方华, 付翔, 等. TiO₂/g-C₃N₄光催化材料的制备及其可见光降解性能研究[J]. 化工新型材料, 2020, 48(11): 99-102, 107
[12] 张苏敏, 张毅, 刘仁红, 等. 红外测油仪用标准物质的研制[J]. 中国测试, 2011, 37(6): 24-26
[13] 郄佳. C₃N₄光催化剂的第一性原理研究[D].唐山: 华北理工大学,2018.
[14] WANG X N, JIA J P, WANG Y L, et al. Combination of photocatalysis with hydrodynamic cavitation for degradation of tetracycline[J]. Chemical Engineering Journal, 2017, 315: 274-282
[15] WU R J, CHEN C C, CHEN M H, et al. Titanium dioxide-mediated heterogeneous photocatalytic degradation of terbufos: parameter study and reaction pathways[J]. Journal of Hazardous Materials, 2009, 162(2): 945-953
[16] 陈婷, 赵琪, 陈泉源, 等. 不同光源照射下天然含铁矿物催化H₂O₂深度处理印染废水效果对比[J]. 环境工程学报, 2021, 15(5): 1558-1566