纳米钯?铝双金属对水中3-氯酚的脱氯降解研究

Dechlorination degradation of 3-chlorophenol in aqueous solution by Pd/Al bimetallic nanoparticles

采用置换沉积法制备了纳米钯/铝双金属催化剂,氢解还原去除水相中难降解有毒有机物3-氯酚(3-CP),考察了溶液pH、钯负载量、纳米钯/铝双金属投加量、反应温度对脱氯效果的影响并解析相关反应机制。结果表明:(1)初始pH 3.0时,沉积液中93.25%(质量分数,下同)～96.67%的钯可有效负载于铝材上。(2)在pH为3.0、纳米钯/铝双金属投加量为2g/L、钯负载量为1.16%(质量分数)、反应温度为25℃下降解初始摩尔浓度为0.389mmol/L的3-CP,反应终了时脱氯率在99%以上。利用纳米钯/铝双金属降解氯代有机污染物具有高效低耗的优势,在实际应用上具有较好的前景。

Pd/A1 bimetallic nanoparticles were prepared by replacement deposition method. The obtained Pd/A1 nanoparticles were applied as catalyst to dechlorinate refractory 3-chlorophenol （3-CP） in aqueous solution. The effect of pH, Pd loading quantity, catalyst dosage and temperature on dechlorination efficiency was investigated and the mechanism of catalytic dechlorination of 3-CP was analyzed. Results showed that 93. 25% （mass fraction, similarly hereafter） -96.67% of Pd in initial solution achieved the replacement deposition onto the A1 substrates when the initial pH was 3.0. Under the following conditions： initial pH was 3.0,Pd/A1 nanoparticles was 2 g/L,Pd loading quantity was 1.16% and reacted at 25 ℃,more than 99% of 3-CP with the initial concentration of 0. 389 mmol/L could be ef-fectively removed. Degradation of chlorinated organic pollutant by Pd/A1 bimetallic nanoparticles had some advantages of high efficiency and low energy consumption,so it had the good prospect in future optical application.