多孔海藻酸钙/氧化石墨烯复合气凝胶高效去除水中的铅、铜和镉离子

Efficient Removal of Lead, Copper and Cadmium Ions from Water by a Porous Calcium Alginate/Graphene Oxide Composite Aerogel.

作者信息

Pan Linhai, Wang Zhuqing, Yang Qi, Huang Rongyi

机构信息

AnHui Provice Key Laboratory of Optoelectronic and Magnetism Functional Materials, Anqing Normal University, Anqing 246011, China.

Faculty of Production Engineering, University of Bremen, Am Fallturm 1, D-28359 Bremen, Germany.

出版信息

Nanomaterials (Basel). 2018 Nov 20;8(11):957. doi: 10.3390/nano8110957.

In this study, we fabricated a porous calcium alginate/graphene oxide composite aerogel by using polystyrene colloidal particles as sacrificial template and graphene oxide as a reinforcing filler. Owing to the excellent metal chelation ability of calcium alginate and controlled nanosized pore structure, the as-prepared calcium alginate/graphene oxide composite aerogel (mp-CA/GO) can reach the adsorption equilibrium in 40 min, and the maximum adsorption capacity for Pb, Cu and Cd is 368.2, 98.1 and 183.6 mg/g, respectively. This is higher than most of the reported heavy metal ion sorbents. Moreover, the mp-CA/GO can be regenerated through simple acid-washing and be used repeatedly with little loss in performance. The adsorption mechanism analysis indicates that the mp-CA/GO adsorb the heavy metal ions mainly through the ion exchange and chemical coordination effects.

在本研究中，我们以聚苯乙烯胶体颗粒为牺牲模板、氧化石墨烯为增强填料，制备了一种多孔海藻酸钙/氧化石墨烯复合气凝胶。由于海藻酸钙具有优异的金属螯合能力以及可控的纳米级孔隙结构，所制备的海藻酸钙/氧化石墨烯复合气凝胶（mp-CA/GO）在40分钟内即可达到吸附平衡，对铅、铜和镉的最大吸附容量分别为368.2、98.1和183.6 mg/g。这高于大多数已报道的重金属离子吸附剂。此外，mp-CA/GO可通过简单的酸洗进行再生，并能反复使用，性能几乎无损失。吸附机理分析表明，mp-CA/GO主要通过离子交换和化学配位作用吸附重金属离子。