污泥陶粒对镍离子的吸附规律研究

摘要

Using dewatered sludge from sewage treatment plant and fly ash,clay as raw materials,sludge ceramsite was prepared through mixing in an appropriate ratio and high-temperature sintering.The adsorption law of Ni2+ on sludge ceramsite was studied.The results show that,with increasing of adsorption time,adsorption capacity of sludge ceramsite to metal ions increases,Ni2 + adsorption time to reach the equilibrium is 140 min,the corresponding maximum adsorption is 0.001 64 mg/g.Thermodynamic study results show that:△Gθ＞ 0,the reaction is non-spontaneous process;△Hθ ＜0,the reaction is exothermic;△Sθ ＜0,the entropy of Ni2 + adsorption process on the sludge ceramic reduces,it is in line with adsorption exchange theory.%以污水处理厂产生的脱水污泥和粉煤灰、粘土为原料,研究以适宜的配比混合高温烧结制备陶粒以及其对Ni2+的吸附规律.结果表明:陶粒对金属离子的吸附量随着时间增加而增加,Ni2+达到吸附平衡的时间为140 min,相应的最大吸附量为0.001 64 mg/g;热力学研究结果表明:△G θ＞0,反应是非自发的过程;△Hθ＜0,反应是放热反应;△Sθ＜0,Ni2+在陶粒上的吸附是熵减小过程,符合吸附交换理论.