火山渣对地下水中Cd2+的吸附效果

针对水体中Cd²⁺污染问题, 采用生态安全型火山渣进行吸附低温水体中Cd²⁺的实验研究, 分析火山渣吸附Cd²⁺的效果及影响因素. 结果表明： 火山渣是一种具有潜在应用价值的Cd²⁺吸附剂, 1.00 g火山渣对10 ℃,0.5 mg/L水体中Cd²⁺的去除率达97.10%； 接近中性环境有利于吸附Cd²⁺; Ca²⁺,Mg²⁺,NO^-₃对火山渣吸附Cd²⁺有抑制作用, Fe²⁺和 Mn²⁺的抑制作用较小； 当NH⁺₄和NO^-₂的质量浓度低于50 mg/L时, 对吸附无影响, 当其质量浓度大于50 mg/L时, 对吸附有抑制作用； SO^2-₄对吸附作用无影响; 质量浓度较大的HCO^-₃对吸附Cd^2+有促进作用.

Adsorption Effect on Cd2+ by Scoria in Groundwater

Aiming at the problem of Cd²⁺ pollution in water, the experiment of Cd^2+ adsorption by ecologically safe scoria in low temperature water was carried out, and we analyzed the effect and influence factors ofCd²⁺ adsorption by scoria. The results show that scoria is a kind of Cd²⁺ adsorbent with potential value. The removal rate reaches 97.10% in0.5 mg/L Cd²⁺ solution using 1.00 g scoria at 10 ℃. The neutral environment is conducive to adsorbing Cd²⁺. Ca²⁺,Mg²⁺ and NO^-₃ in groundwater can inhibit the adsorption of Cd²⁺by scoria, while Fe²⁺ and Mn²⁺ have little inhibitory effect.When the mass concentrations of NH⁺₄ and NO^-₂ are less than 50 mg/L, they have no effects on the adsorption of Cd²⁺ by scoria.When the mass concentrations are more than 50 mg/L, they have inhibitory effects on the absorption. SO^2-₄ has no effect on the adsorption. HCO^-₃ with highermass concentration has promotion effect on the adsorption of Cd²⁺ by scoria.