中文摘要：

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。

英文摘要：

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.