摘要
利用超声波强化液相还原法制备活性炭颗粒(GAC)稳定化纳米级Pd/Fe复合颗粒,并对2-氯联苯(2-CB)进行催化还原脱氯研究。结果表明:40k Hz超声波辐照强化下制备的GAC稳定化纳米级Pd/Fe复合颗粒的比表面积、粒径和分散性均较普通液相还原法制备的复合颗粒有明显改善,粒径均在100nm以下,比表面积增大了21.73%。当复合颗粒钯化率为0.3%(质量分数)且GAC和Pd/Fe投加量分别为0.15g/L和5.0g/L时,在反应温度25℃、初始pH为3的条件下反应300min后,对初始质量浓度为10mg/L的2-CB降解率近95%,符合拟一级反应动力学,反应速率常数为3.88×10^(–2)min^(–1)。
Granular activated carbon（GAC） stabilized Pd/Fe nanoparticles were prepared by using ultrasound-assisted liquid phase reductive method.The influence factors and degradation kinetics of 2-chlorobiphenyl（2-CB） catalytic reductive dechlorination by GAC stabilized Pd/Fe nanoparticles were explored.The experimental results showed that the diameters and specific surface areas of most particles prepared under 40 kHz and 150 W ultrasound were obviously modified.The diameters of most particles were less than 100 nm and the specific surface areas were increased by 21.73%.Up to 95% of 2-CB was removed in 300 min with mass fraction of Pd in GAC stabilized Pd/Fe nanoparticles of 0.3%,initial 2-CB concentration of 5 mg/L,GAC dosage of 0.15 g/L,Pd/Fe nanoparticles of 5.0 g/L,initial pH=3.0,and reaction temperature of 25℃.The degradation of 2-CB followed pseudo-first-order kinetics reaction and the apparent pseudo-first-order kinetics constant was 3.88×10^–2 min^–1.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第12期4493-4500,共8页
Chemical Industry and Engineering Progress
基金
浙江省自然科学基金(LY15B070005)
浙江省科技厅公益技术研究社会发展项目(2015C33233)
