粉末活性炭对水中甲霜灵的吸附效能研究

Adsorption performance of pesticide metalaxyl by powdered activated carbon

研究粉末活性炭(PAC)对水中甲霜灵的吸附效能,考察PAC种类、PAC投加量、反应温度、pH和不同本底对吸附反应的影响。研究结果表明,相比煤质炭和椰壳炭,竹质炭对水中甲霜灵的吸附效果最好,在10min内基本达到吸附饱和,对甲霜灵的去除率达96.4%。随着PAC投加量的增加,甲霜灵的去除率提高,但吸附容量下降。高温条件更有利于PAC对甲霜灵的吸附,但随着PAC投加量的增加,促进的幅度逐渐减缓。当pH=5时,甲霜灵的去除率达到最高,强酸或强碱性条件均不利于吸附反应的进行。由于天然有机物与目标污染物的吸附竞争作用,使得原水中甲霜灵的吸附容量相比纯水明显降低。

The adsorption performance of metalaxyl in water by powdered activated carbon （PAC） was evaluated. The effects of different PAC species, PAC dosages, reaction temperature, pH and rawwateron the adsorption of metalaxyl were investigated. The results showed that, com- pared to coal and coconut shell charcoal, bamboo charcoal had the best performance in metalaxyl adsorption, reaching adsorption equilibrium within 10 min with a removal efficiency of 96. 4G. With the increase of PAC dosage, the metalaxyl removal efficiency increased, but the adsorption capacity decreased. High temperature promoted the adsorption of metalaxyl on PAC, but with the increase of PAC dosage, the extent of enhancement was gradually slowed down. When the pH 5, the removal rate of metalaxyl reached the highest. Strong acidic or alkaline conditions were not conducive to the adsorption. Due to the competitive adsorption of natural organic matter, the adsorption capacity of metalaxyl in raw water was substantially lower than that in pure water.