利用长碳链季铵盐阳离子表面活性剂(十六烷基三甲基溴化铵,CTMAB)在微波辐射条件下对以广西宁明膨润土制得的钠基膨润土进行改性,得到有机膨润土.利用其对经生化处理后的中药废水尾水进行脱色处理,考察了不同的工艺条件如吸附时间、膨润土投加量、反应温度、pH值对中药废水脱色效果的影响.结果表明:pH对脱色效果有影响,体系以物理吸附为主.当吸附剂用量为3.5 g/L、吸附时间为25 m in、吸附温度为32℃,不调节pH值,经生化处理后的中药废水尾水脱色率可达97%,且其吸附脱色能力大于活性炭.
Bentonite combined with sawdust and other metallic compounds was used to remove phosphate from aqueous solutions in this study. The adsorption characteristics of phosphate on the modified bentonite were investigated, including the effects of temperature, adsorbent dosage, initial concentration of phosphate and pH on removal of phosphate by conducting a series of batch adsorption experiments. The results showed that 98% of phosphate removal rate was obtained since sawdust and bentonite used in this investigation were abundantly and locally available. It is concluded that modified bentonite is a relatively efficient, low cost and easily available adsorbent for the removal of phosphate from aqueous solutions.
