海藻酸钠包埋凹凸棒土颗粒吸附剂的制备及其对单宁酸的吸附

利用海藻酸钠和氯化钙成球原理,包埋制备有机凹凸棒土颗粒(GOAT)吸附剂,通过SEM图和红外谱图进行表征,通过批量实验考察了凹凸棒土颗粒吸附剂对水体天然有机质单宁酸的吸附行为,结果表明,凹凸棒土颗粒吸附剂内部形貌和粉体吸附剂(POAT)相比无明显变化;平衡吸附量(142 mg/g)稍低于粉体吸附剂(148 mg/g);吸附速率较快,100 min时吸附趋于平衡,吸附行为符合准二级动力学方程;吸附等温线符合Freundlich等温方程,吸附为放热反应;pH为6时吸附性能最佳。

Preparation of alginate entrapped attapulgite adsorbent particles and its adsorption to tannic acid

The granular organo-attapulgite adsorbent (GOAT) was prepared by sodium alginate and calcium chloride embedding method.The embedded GOAT adsorbent was characterized by SEM and FTIR.The adsorption of tannic acid from aqueous solution onto GOAT was investigated using batch experiment.The results showed that the embedded preparation of powder organo-attapulgite adsorbent (POAT) didn't change the internal morphology.The adsorption capacity of GOAT was a litter lower (142 mg/g) than POAT(148 mg/g).The adsorption equilibrium was achieved within 100 min.The adsorption fitted well with the pseudo-second-order kinetic model.The fitted isotherm equation of the adsorption accorded with Freundlich adsorption model,and it is better for adsorption under pH=6.