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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 efficiency of powdered activated carbon (PAC) on metalaxyl in water was investigated. The effects of PAC species, PAC dosage, reaction temperature, pH and different background on the adsorption reaction were investigated. The results show that bamboo charcoal has the best adsorptive effect on metalaxyl in water compared with coal charcoal and coconut charcoal, and basically reaches the adsorption saturation within 10 min, and the removal rate of metalaxyl is 96.4%. With PAC dosage increased, the removal rate of metalaxyl increased, but the adsorption capacity decreased. The high temperature conditions are more conducive to PAC adsorption of metalaxyl, but with the increase of PAC dosage, the promotion rate gradually slow down. When pH = 5, the removal rate of metalaxyl reached the highest, strong acid or strong alkaline conditions are not conducive to the adsorption reaction. Due to the competitive adsorption of natural organic substances and target pollutants, the adsorption capacity of metalaxyl in raw water is obviously lower than that of pure water.