• 关键词：壳聚糖  Y₂(OH)₅NO₃  壳聚糖-钇(Ch—Y)复合微球  吸附  Cr(Ⅵ)

• 基金项目：高等学校博士学科点专项科研基金(No.20090093110006)

• 王芳芳
• 江南大学 生态纺织科学与技术教育部重点实验室,无锡 214122

• 葛明桥
• 江南大学 生态纺织科学与技术教育部重点实验室,无锡 214122

• 吴敏
• 江南大学 生态纺织科学与技术教育部重点实验室,无锡 214122

• 卢丽萍
• 江南大学 生态纺织科学与技术教育部重点实验室,无锡 214122

• 摘要：以壳聚糖和Y₂(OH)₅NO₃为原料通过乳液交联法制备了壳聚糖-钇(Ch—Y)复合微球,通过扫描电镜、透射电镜、X射线衍射、红外光谱等方法对其表面形貌、结构进行了表征.探讨了溶液的pH值、反应时间、投加量、离子初始浓度对其吸附性能的影响.研究结果表明,壳聚糖-钇(Ch—Y)复合微球在pH值为3的酸性环境中对Cr(Ⅵ)保持了较高的吸附能力,吸附容量为52.39 mg·g^-1,其吸附行为符合Langmuir吸附等温模型;通过吸附机理的研究,发现壳聚糖-钇(Ch—Y)对Cr(Ⅵ)吸附是化学吸附静电吸附协同氧化Cr(Ⅵ)离子作用来实现的.

• Abstract：Chitosan/yttrium microsphere (Ch—Y) was prepared by coating chitosan on the surface of Y₂(OH)₅NO₃ powders through w/o suspension cross-lingking method. The presence of functional groups and surface morphology of the adsorbent were characterized by SEM, XRD, IR and TEM. The Chitosan/yttrium microsphere (Ch—Y) kept a high adsorption ability at pH value of 3, and the capacity of adsorption was 52.39 mg·g^-1. The adsorption data were fitted with Langmuir adsorption isotherm model. It was found that the removal of Cr (Ⅵ) by chitosan /yttrium microsphere was governed by electrostatic adsorption coupled reduction and complexation.

• Key words：chitosan  Y₂(OH)₅NO₃  chitosan/yttrium composite microsphere  adsorption  Cr(Ⅵ)

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