农药污染对人体健康和环境造成极大的危害,因此,对其吸附现象的研究十分必要.采用间歇平衡法考察了硫丹杀虫剂在10种不同土壤中的吸附性能.吸附系数(Kd)范围为1.4～18μg/mL.白沙瓦土壤由于有机质含量最高(1.4％),其Kd值最高.吉布斯自由能为负值表明土壤与农药的相互作用较低,说明该反应本质上是物理吸附和放热反应.经统计学分析,土壤pH与Kd呈负相关(R2=–0.77,P=0.03),与有机质呈正相关(R2=0.96).从甘蔗渣中提取的活性炭,可去除大量农药.在5×10–6和7.5×10–6浓度的最大去除率分别为93％和97％.以生物质为原料制备的活性炭具有高效、经济的特点.%Pesticide contamination causes precarious implications on human health and environment. Thus the investigation of its sorption phenomenon is highly imperative. Endosulfan insecticide was examined for its adsorption behavior on ten assorted soils through batch equilibrium method. Adsorption coefficient values (Kd) ranged from 1.4 μg/mL to 18 μg/mL. The highest Kd value was obtained for Peshawar soil owing to the presence of highest amount of organic matter (1.4％). Negative values of Gibbs free energy displayed a low interaction between soil and pesticide, exhibiting that the reaction was physiosorption and exothermic in nature. Statistical analysis showed a negative correlation of soil pH and Kd (R2=–0.77 and p=0.03) and a positive correlation with organic matter (R2=0.96). Activated carbon prepared from Saccharum officinarum bagasse removed significant amount pesticide. The maximum removal observed was 93％ and 97％ in 5×10–6 and 7.5×10–6, respectively. Activated carbon prepared from biomass for removal purposes was proved to be highly efficient and cost effective.
展开▼
