生物炭基La(III)-Ce(III)交联海藻酸钠杂化水凝胶对弱酸性艳蓝RAW的高效吸附

Efficient Adsorption of Weak Acid Blue RAW on Biochar-Based La(III)-Ce(III) Crosslinked Sodium Alginate Hybrid Hydrogel

摘要: 采用液滴聚合法成功合成了生物炭(BC)基La(III)-Ce(III)交联海藻酸钠(SA)杂化水凝胶(BC/Ce-SA-La)，用于对水体中弱酸性艳蓝RAW染料的吸附。并对其进行了SEM表征，同时探究了接触时间及温度对染料吸附剂性能的影响。结果表明，在pH值为8.0，接触时间为180分钟，温度为298 K的条件下，BC/Ce-SA-La对染料的吸附量达到1803 mg/g。吸附过程符合拟二级速率模型，吸附行为完全符合Langmuir模型。BC/Ce-SA-La能有效去除废水中的弱酸性艳蓝RAW染料，且极易从水体中分离回收，是一种成本效益高且前景广阔的颗粒型生物吸附剂。

Abstract: Biochar (BC)-based La(III)-Ce(III) crosslinked sodium alginate (SA) hybrid hydrogel (BC/Ce-SA-La) were successfully synthesized by droplet polymerization for the adsorption of weak acid blue RAW dye in water. It was also characterized by SEM and the effects of contact time and temperature on dye adsorption properties were investigated. The adsorption amount of dye by BC/Ce-SA-La reached 1803 mg/g at pH 8.0, contact time 180 min, and temperature 298 K. The adsorption process followed Pseudo-second-order rate model; the adsorption behavior was perfectly explained by Langmuir model. BC/Ce-SA-La could remove the weak acid blue RAW dye in wastewater effectively, and it was easily separated and recovered from the water, which was a cost-effective and promising granular biosorbent.