火山渣吸附低温水体中SO_4^(2-)的效果

Effect of Scoria on Adsorption of SO_4^(2-) in Low Temperature Water

以火山渣为吸附材料,研究其对低温水体中SO_4^(2-)的吸附效果及影响因素.实验结果表明:火山渣对SO_4^(2-)具有较好的吸附效果;当SO_4^(2-)初始质量浓度为100~1 000mg/L时,吸附量随初始质量浓度的增加而增大;当ρ(SO_4^(2-))=1 000mg/L时,火山渣最大吸附量为6.24mg/g,平衡时间最短,为4h;吸附过程的最佳pH=7;Ca^(2+),Mg^(2+)对火山渣吸附SO_4^(2-)有一定促进作用,而Cl^-与NO_3^-具有抑制作用.

Taking scoria as an adsorbent material,we studied its adsorption effect on SO_4^(2-) in low temperature water and its influence factors.The experimental results show that the scoria has a good adsorption effect on SO_4^(2-).When the initial mass concentration of SO_4^(2-) is 100—1 000 mg/L,the adsorption amount increases with the increase of the initial mass concentration.Whenρ(SO_4^(2-))=1 000 mg/L,the maximum adsorption amount is 6.42 mg/g,and the shortest equilibrium time is 4 h.The optimum pH for adsorption of SO_4^(2-) is 7.Ca^(2+)and Mg^(2+)have a slight promoting effect on SO_4^(2-) adsorption by scoria,while Cl-and NO_3^- have inhibitory effect.