改性SiO2气凝胶对废水中Fe3+的吸附性能

制备了改性SiO₂气凝胶，考察了经不同类型、不同配比的改性剂改性的SiO₂气凝胶对模拟含Fe³⁺废水的吸附处理效果。实验结果表明：改性SiO₂气凝胶的最佳制备条件为三甲基氯硅烷（TMCS）作改性剂，V（TMCS）#x02236;V（正己烷）=1#x02236;5；当改性SiO₂气凝胶加入量为75g/L、吸附时间为4h、Fe³⁺质量浓度为10mg/L时，模拟含Fe³⁺废水的Fe³⁺去除率为98.32%，剩余Fe³⁺质量浓度为0.168mg/L；采用改性SiO₂气凝胶动态吸附处理流量为420mL/h、Fe³⁺质量浓度为100mg/L的模拟含Fe³⁺废水，吸附后废水中剩余Fe³⁺质量浓度仅为0.196mg/L。

Adsorption Capability of Modified SiO2 Aerogel to Fe3+ in Wastewater

The modified SiO₂ aerogels were prepared and the effects of the SiO₂ aerogels modified by the modifiers with different type and proportion on the treatment of Fe³⁺-containing wastewater were studied. The optimum preparation conditions for the modified SiO₂ aerogel are as follows：using trimethylchlorosilane(TMCS) as modifier,V(TMCS)#x02236;V(n-hexane)=1#x02236;5. When the modified SiO₂ aerogel dosage is 75 g/L,the adsorption time is 4 h and the Fe³⁺ mass concentration is 10 mg/L,the highest Fe³⁺ removal rate from the simulated Fe³⁺-containing wastewater is 98.08%,the lowest residual Fe³⁺ mass concentration is 0.168 mg/L. When the modified SiO₂ aerogel is used in the dynamic adsorption of Fe³⁺ in the simulated wastewater with 420 mL/h of flow rate and 100 mg/L of Fe³⁺ mass concentration, the residual Fe³⁺ mass concentration of the treated wastewater is only 0.196 mg/L.