竹炭对水溶液中镍(Ⅱ)吸附规律研究

Adsorption Rule of Bamboo Charcoal for Nickel(Ⅱ) in Aqueous Solution

研究了竹炭对水溶液中Ni2+吸附规律,探讨了吸附时间、溶液的pH值、竹炭用量、Ni2+初始浓度等条件对Ni2+去除率的影响及吸附等温线。结果表明,竹炭对水溶液中Ni2+有较好的去除效果,pH值是影响Ni2+去除率的主要因素,溶液接近中性时吸附效果最好;竹炭投加量为30g/L时,即可达到最佳吸附效果;竹炭的动态吸附过程符合二级吸附动力学方程,吸附平衡时间为180min;随着吸附温度的升高,吸附量增大,表明吸附是吸热过程;竹炭对Ni2+的吸附符合Langmuir吸附等温线。

The adsorption rule of bamboo charcoal for Ni2+ was studied in aqueous solution.The adsorption isotherms of Ni2+ on activated carbon was studied by considering the effects of various parameters on the removal rate of Ni2+,such as adsorption time,pH value,adsorbent dosage,and initial concentration of Ni2+.The experimental result shows that the bamboo charcoal is an efficient adsorbent for removing Ni2+ from aqueous solution,and Ni2+ adsorption is found to be pH-dependent and the optimum initial pH is chosen to be 7.0.The optimal adsorbent dosage is 30g/L.The nickel(Ⅱ) uptake by bamboo charcoal is best described by pseudo second-order rate model.The adsorption reaches equilibrium in 180 minutes.Adsorption increased with increases in adsorption temperatures,it means that the sorption process is a endothermic process.The adsorption behavior of the bamboo charcoal for Ni2+ is in accordance with the Freundlich isotherm model.