改性活性炭对土壤镉的吸附性影响

目的研究3种改性活性炭对菜地、河流底泥、荷花底泥镉吸附性的影响。方法对活性炭进行酸改性、碱改性和氧化改性,采用双硫腙分光光度法测定镉含量。结果对实验土样,最佳活性炭添加量为0.025 g/g。随着初始镉含量的升高,土壤对镉的吸附量不断增大。结论 3种改性活性炭相比普通活性炭对湿地土壤的镉吸附量均有不同程度的提升,荷花底泥中,酸性、氧化改性活性炭相比普通活性炭,吸附效果提高7.7%,8.3%,吸附效果提升显著。

Study of Soil Cadmium Adsorption by Modified Activated Carbon

Objective Research the effect of three kinds of modified activated carbon for cadmium adsorption of vegetable field,river sediment and lotus sediment. Method This experiment was carried out on the activated carbon on acid modification,alkali modification and oxidation modification, and determination of cadmium content dithizone spectrophotometry. Results The best activated carbon content is 0. 025 g /g in the soil sample for experiment. With the increase of initial concentration of cadmium,soil of cadmium adsorption quantity is increasing. Conclusion Compared with common active carbon,three kinds of modified activated carbon cadmium adsorption quantity of the wetland soil all have different degrees of ascension. And compared to common activated carbon,the cadmium adsorption of the activated carbon with acid modified and oxidation modified increased by 7. 7%,8. 3%,the adsorption increases significantly.