Liu Jie, Qi Zhifu, Li Xiaodong, Chen Tong, Buekens Alfons, Yan Jianhua, Ni Mingjiang
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China.
Environ Sci Pollut Res Int. 2015 Dec;22(23):19093-100. doi: 10.1007/s11356-015-5113-3. Epub 2015 Aug 2.
Copper dichloride is an important catalyst both in the dechlorination of chlorinated aromatic compounds and the formation of PCDD/Fs. The effect of copper dichloride on polychlorinated biphenyls (PCBs), polychlorinated dibenzo-p-dioxins (PCDDs), and polychlorinated dibenzofurans (PCDFs) was studied in treated soil and off gas after thermal desorption of PCB-contaminated soil at 300, 400, 500, 600 °C. The presence of copper dichloride clearly enhances thermal desorption by promoting PCBs removal, destruction, and dechlorination. After thermal treatment at 600 °C for 1 h, the removal efficiency and destruction efficiency for PCBs reached 98.1 and 93.9%, respectively. Compared with the positive influence on PCBs, copper dichloride catalyzed large amount of PCDFs formation at 300 °C, with the concentration ratio of 2.35. The effect of CuCl2 on PCDFs formation weakened with the rising temperature since PCDFs destruction became dominant under higher temperature. Different from PCDFs, PCDDs concentration in treated soil and off gas decreased continuously with the increasing temperature.
二氯化铜在氯化芳香化合物的脱氯以及多氯二苯并对二噁英/多氯二苯并呋喃（PCDD/Fs）的形成过程中都是一种重要的催化剂。在300、400、500、600℃对受多氯联苯（PCBs）污染的土壤进行热脱附后，研究了二氯化铜对处理后的土壤和废气中多氯联苯、多氯二苯并对二噁英（PCDDs）和多氯二苯并呋喃（PCDFs）的影响。二氯化铜的存在通过促进多氯联苯的去除、破坏和脱氯，明显提高了热脱附效果。在600℃热处理1小时后，多氯联苯的去除效率和破坏效率分别达到98.1%和93.9%。与对多氯联苯的积极影响相比，二氯化铜在300℃催化生成了大量的多氯二苯并呋喃，浓度比为2.35。随着温度升高，由于在较高温度下多氯二苯并呋喃的破坏占主导，二氯化铜对多氯二苯并呋喃形成的影响减弱。与多氯二苯并呋喃不同，处理后的土壤和废气中多氯二苯并对二噁英的浓度随温度升高而持续下降。
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