State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Tianhe District, Guangzhou, 510640, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Tianhe District, Guangzhou, 510640, China; School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China.
Carbohydr Polym. 2019 Jul 15;216:119-128. doi: 10.1016/j.carbpol.2019.04.020. Epub 2019 Apr 5.
As a kind of potential absorbent, polysaccharide materials are limited due to weak stability, low absorption and recovery rate. Herein, a novel composite adsorbent - the magnetic composite gel beads (CMC/SA/graphene oxide@FeO) were prepared by combining carboxymethyl chitosan (CMC), sodium alginate (SA) with graphene oxide@FeO, and then utilized for the adsorption of Cu, Cd and Pb from the wastewater. The physicochemical property of CMC/SA/graphene oxide@FeO beads were characterized in detail. The CMC/SA/graphene oxide@FeO magnetic gel beads could separate easily from the wastewater and showed a higher stability due to the addition of graphene oxide@FeO. The adsorption experiments show that the adsorption of Cu, Cd and Pb on the magnetic gel bead was well fitted with pseudo-second-order model and Langmuir isotherm model, and the maximum adsorption capacity of Cu, Cd and Pb reached 55.96, 86.28 and 189.04 mg/g, respectively. Moreover, the magnetic gel beads had selective adsorption toward Pb. In addition, the magnetic gel beads still obtained 90% of the adsorption rates after five cycles, and showed good adsorption efficiency in the simulated real environment. This work proves that the CMC/SA/graphene oxide@FeO magnetic gel beads as the adsorbents have promising potential in wastewater treatment.
作为一种潜在的吸附剂，多糖材料由于稳定性弱、吸收和回收率低而受到限制。在此，通过将羧甲基壳聚糖（CMC）、海藻酸钠（SA）与氧化石墨烯@FeO 结合，制备了一种新型复合吸附剂-磁性复合凝胶珠（CMC/SA/graphene oxide@FeO），并将其用于从废水中吸附 Cu、Cd 和 Pb。详细表征了 CMC/SA/graphene oxide@FeO 珠的物理化学性质。由于添加了氧化石墨烯@FeO，CMC/SA/graphene oxide@FeO 磁性凝胶珠可以很容易地从废水中分离出来，并具有更高的稳定性。吸附实验表明，磁性凝胶珠对 Cu、Cd 和 Pb 的吸附很好地符合准二级模型和 Langmuir 等温线模型，Cu、Cd 和 Pb 的最大吸附容量分别达到 55.96、86.28 和 189.04mg/g。此外，磁性凝胶珠对 Pb 具有选择性吸附。此外，磁性凝胶珠在五次循环后仍保持 90%的吸附率，在模拟实际环境中表现出良好的吸附效率。这项工作证明，CMC/SA/graphene oxide@FeO 磁性凝胶珠作为吸附剂在废水处理中具有广阔的应用前景。
