文章摘要
张思月,张永德,罗学刚,宗有莉,乔丹.果胶/AMP-Zn微球的制备及对Cs 的吸附性能[J].精细化工,2018,35(5):
果胶/AMP-Zn微球的制备及对Cs 的吸附性能
Preparation of Pectin/AMP-Zn Microsphere and Its Adsorption Properties for Cesium
投稿时间:2017-07-10  修订日期:2017-10-29
DOI:
中文关键词: 磷钼酸铵  果胶  Cs  吸附  选择性
英文关键词: ammonium molybdophosphate  pectin  cesium ion  adsorption  selectivity
基金项目:国家核设施退役及放射性废物治理科研重点项目(14ZG6101);西南科技大学平台基金项目(14tdsc01)
作者单位E-mail
张思月 西南科技大学材料科学与工程学院 1298085191@qq.com 
张永德 西南科技大学生物质材料教育部工程研究中心 zhangyongde1969@126.com 
罗学刚 西南科技大学生物质材料教育部工程研究中心  
宗有莉 西南科技大学材料科学与工程学院  
乔丹 西南科技大学材料科学与工程学院  
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中文摘要:
      采用凝胶-溶胶法,以Zn2+为交联剂,将磷钼酸铵(AMP)通过静电注射装置包埋于果胶中,制备出果胶/AMP-Zn微球吸附剂,用于放射性废水中Cs+的去除。系统探讨了不同pH、投料量、接触时间、Cs+初始质量浓度、温度及共存离子对果胶/AMP-Zn微球去除Cs+的影响,并利用SEM、FTIR和XPS等表征方法分析其吸附机理。结果表明:果胶/AMP-Zn微球能在pH=3~11范围内使用,耐酸碱性能良好,且在pH=5,初始质量浓度为120 mg/L,吸附剂量为0.05 g的条件下,吸附剂的吸附量为41.837 mg/g; 共存离子K+、Na+、Li+、Ca2+和Mg2+对Cs+的吸附影响不大,说明该吸附剂具有较好的吸附选择性;热力学和动力学研究结果表明,此吸附过程符合Freundlich等温吸附模型和准二级动力学模型,且是一个自发放热的过程;上述表征方法证实果胶/AMP-Zn微球吸附Cs+的吸附机理为Cs+与AMP上的NH4+发生离子交换作用。
英文摘要:
      The pectin/AMP-Zn microsphere was prepared by embedding ammonium phosphomolybdate (AMP) in pectin by electrostatic-injecting device using gel-sol method and Zn2+ as crosslinking agent, which was used in the removal of Cs+ in radioactive waste water. The effects on adsorption cesium were systematically investigated, including pH, dosage, contact time, initial concentration of Cs+, temperature and coexisting ions. The adsorption mechanism was analyzed by means of SEM, FTIR and XPS. Furthermore, the results showed that the pectin/AMP-Zn microspheres could be applied in a range of pH=3~11. Therefore, the adsorbent had good acid and alkali resistance. The adsorption capacity of adsorbent was 41.837 mg/g under the condition of pH=5, initial mass concentration of 120 mg/L and adsorption dose of 0.05 g. The presence of competing ions (K+, Na+, Li+, Ca2+ and Mg2+) had no effect on the cesium adsorption, which indicated pectin/AMP-Zn microspheres had high selectivity. Thermodynamic and kinetic studies exhibited that it was fitted well with Freundlich model and pseudo-second-order kinetic model, respectively. Besides, the process that the adsorption of cesium onto pectin/AMP-Zn microspheres was a spontaneous exothermic process. In addition, above-mentioned characterization methods confirmed that the adsorption mechanism was ion exchange reaction between NH4+ and Cs+.
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