煤矸石复合吸附剂对含铅废水处理性能研究

Adsorption capability of coal gangue composite adsorbent to lead ion in wastewater

以煤矸石、石灰石和氯化铝为原料,制备呈碱性的复合吸附剂和呈中性的复合吸附剂,处理含铅(Ⅱ)废水,结果表明,碱性吸附剂的最佳吸附条件为投加量0.5 g,吸附时间60 min,p H为1,反应温度为25℃时,此时吸附量为7.62 mg/g,去除率为96.68%;中性吸附剂的最佳吸附条件为投加量0.5 g,吸附时间80 min,p H为1,反应温度25℃,此时吸附量达到7.19 mg/g,去除率为85.40%。碱性复合吸附剂吸附含铅(Ⅱ)废水能较好的与准二级动力学拟合,中性复合吸附剂吸附含铅(Ⅱ)废水能较好的与准一级动力学拟合。采用Freundlich方程描述碱性复合吸附剂吸附低浓度和高浓度含铅(Ⅱ)废水,用Langmuir方程描述中性吸附剂吸附低浓度含铅(Ⅱ)废水,用Temkin方程描述中性吸附剂吸附高浓度含铅(Ⅱ)废水。

Using coal gangue,limestone and aluminium chloride as raw materials to prepared alkaline compound adsorbent and neutral compound adsorbent containing to treating wastewater with Pb（ Ⅱ）.When adsorbent dosage is 0. 5 g,adsorption time is 60 min,initial p H is 1,temperature is 25 ℃,the experimental results shows alkaline compound adsorbent can reach the best adsorption conditions,at this time,the adsorption capacity is 7. 62 mg/g and the removal rate is 96. 68%; when adsorbent dosage is0. 5 g,adsorption time is 80 min,initial p H is 1,temperature is 25 ℃,the experimental results shows neutral compound adsorbent can reach the best adsorption conditions,at this time the adsorption capacity is7. 19 mg/g and the removal rate is 85. 40%. The pseudo-second-order kinetic model could provide a better correlation to the alkaline compound adsorbent; and neutral compound adsorbent match with the pseudo-first-order kinetic model. Adopting the Freundlich equation describing the adsorption process of both high concentration and low concentration wastewater by using alkaline compound adsorbent; and the Langmuir equation describing the adsorption process of low concentration wastewater by using neutral compound adsorbent; and use the Temkin equation describing the adsorption process of high concentration wastewater by using neutral compound adsorbent.