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为了考察以牛粪为原料制备的生物炭对水溶液中Cd2+的吸附效果,进行了吸附影响因素、吸附等温线和动力学研究。结果表明,当热解温度为700℃、投加量为20 g/L、溶液初始pH为5、水溶液Cd2+初始浓度为10 mg/L、吸附平衡时间为60 min和溶液温度为25℃时,对Cd2+的吸附效果最佳,Cd2+去除率可达99%以上。提高溶液温度有利于吸附。降低生物炭热解温度和投加量对吸附效果影响不大。Langmuir方程能更好地拟合生物炭对Cd2+的吸附等温过程,吸附过程符合准二级动力学方程。牛粪生物炭是性能优良、价格经济的水溶液中Cd2+的吸附剂。
In order to investigate the adsorption effect of biochar prepared from cow dung on Cd2 + in aqueous solution, the adsorption factors, adsorption isotherms and kinetics were studied. The results showed that when the pyrolysis temperature was 700 ℃, the dosage was 20 g / L, the initial pH of the solution was 5, the initial concentration of Cd2 + in the aqueous solution was 10 mg / L, the adsorption equilibrium time was 60 min and the solution temperature was 25 ℃, The best adsorption of Cd2 +, Cd2 + removal rate of up to 99%. Increasing the temperature of the solution favors adsorption. Reducing the pyrolysis temperature and dosage of biochar had little effect on the adsorption effect. Langmuir equation can better fit the biosorption of Cd2 + adsorption isothermal process, the adsorption process in line with quasi-second-order kinetic equation. Cattle biochar is a good performance, affordable water solution Cd2 + adsorbent.