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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。
The graphene oxide prepared by the Hummer method was loaded into the titania / chitosan-based composite particles by chemical mixing method and used for the removal of As (III) in water. The particles were characterized by scanning electron microscopy, Zeta potentiometer and BET specific surface area analyzer. The results showed that the maximum adsorption capacity of modified TiO2 / chitosan / graphene oxide particles was 12.43 mg · g-1 in UV light, while the maximum adsorption capacity of titania / chitosan particles was only 4.97 mg · G-1. The adsorption kinetics fit the pseudo-second-order kinetic model, and the adsorption isotherm can be described by Langmuir model. With the increase of p H value, the adsorption capacity of As (Ⅲ) on the adsorbent decreases gradually. The preparation method of the new composite particle adsorbent has the advantages of simple synthesis conditions, high adsorption capacity and easy regeneration by solid-liquid separation. Therefore, the new composite particle adsorbent has better application prospect than As (Ⅲ) in water.