膨润土负载纳米铁钯去除水中酸性大红3R的研究

Study on Removal of Azo Dye Acid Red 3R by Using Bentonite Supported Bimetallic Fe-Pd Nanoparticles

采用液相还原法制备天然膨润土负载纳米铁钯双金属颗粒,考察了不同材料及影响因素,如溶液温度、pH值等对水中酸性大红去除的影响.实验结果表明:负载型纳米铁钯表现出更高的活性,对高浓度的酸性大红具有良好的去除效果.在投加量为0.5 g.L-1、250 r.min-1、30℃、pH=5.81、ρ0=200mg.L-1条件下,天然膨润土负载纳米铁钯在10 min内对酸性大红的去除率达到98.48%.其降解过程较好地符合伪一级反应动力学(r≥0.983),反应活化能为75.42 kJ.mol-1.

Bentonite supported nanoscale zero-valent iron particles （B-Fe-Pd） was prepared by liquid phase reduction method. Varied conditions of experimental variables such as initial dye concentration, temperature and pH value on the removal of acid red were compared. The results indicate that B-Fe-Pd had advantage to remove high concentration of acid red, in the dosage of 0. 5 g · L-1, 250 r · min-1, 30 ℃, pH = 5.81 and p0 = 200 mg · L-1. The removal of acid red reached 98.48% within 10 minutes by using B-Fe - Pd. The removal reaction of acid red using B- Fe - Pd was perfectly observed to be a pseudo-first-order reaction （ r ≥ 0. 983 ） , and the apparent activation energy was 75.42 kJ · mol-1.