TiO2/壳聚糖/氧化石墨烯复合微粒的制备及吸附As(Ⅲ)  

Synthesis of TiO_2/chitosan/graphene oxide adsorbent beads for adsorption of As(Ⅲ)

作　　者：罗肃霜 杨春平[1,2,3] 何慧军[1,2] 龙智勇[1,2] 程燕[1,2] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]环境生物与控制教育部重点实验室(湖南大学),长沙410082 [3]浙江工商大学环境科学与工程学院,浙江省固体废物处理与资源化重点实验室,杭州310018

出　　处：《环境工程学报》2016年第9期4873-4878,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51278464,51478172);国家国际科技合作专项项目(2015DFG92750)

摘　　要：用化学混合法将采用Hummer方法制备的氧化石墨烯加载到了二氧化钛/壳聚糖基复合微粒中,并用于水中As(Ⅲ)的去除。通过扫描电镜、Zeta电位仪和BET比表面积分析仪对微粒进行了表征。结果表明,经改性后的二氧化钛/壳聚糖/氧化石墨烯复合微粒在紫外光照下最大吸附容量可达12.43 mg·g-1,而二氧化钛/壳聚糖微粒的最大吸附量仅为4.97 mg·g-1。吸附动力学符合拟二级动力学模型,吸附等温线可用Langmuir模型描述。随p H值的增加,吸附剂对As(Ⅲ)的吸附量逐渐减小。该新型复合微粒吸附剂制备方式、合成条件简单,具有吸附容量较高和易于固液分离再生的优点,因此对水中除As(Ⅲ)有较好的应用前景。Graphene oxide was synthesized using the Hummers method, then loaded onto TiO2/chitosan beads by a chemical mixed. TiO2/chitosan/graphene oxide beads （GO/TICB） were used as an adsorbent for re- moving As（ Ⅲ ） from an aqueous solution, and was characterized by a scanning electron microscope （SEM） , Ze- ta SIZER, and a BET surface analyzer. Results indicated a maximum adsorption capacity of 12.43 mg · g-1 after modification of titanium dioxide/chitosan/graphene oxide composite particles under ultraviolet light. However, the maximum adsorption capacity approached 4.97 mg · g-1 without GO. The sorption processes coincided with a pseudo-second-order kinetic model, and the adsorption isotherm was described well by the Langmuir model. With the increase of pH, adsorbent adsorption of As（Ⅲ） decreased. Moreover, GO/TICB was synthesized easi- ly, separated from water, and regenerated by alkali liquor. We can rationally expect that this novel composite bead will be an effective and prospect adsorbent for the removal of As（ Ⅲ ） from water.

关 键 词：氧化石墨烯 壳聚糖 纳米二氧化钛 三价砷 

分 类 号：X703[环境科学与工程—环境工程]