介孔硅材料吸附剂的制备表征及其在水环境中的应用研究

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摘要：本篇文章是对自然界中的砷污染进行了研究，制备合成ZVI-SBA-15并且对它进行表征以及测试在水环境中处理砷的能力。研究内容为：介孔材料ZVI-SBA-15的表面改性以及对砷离子的吸附能力进行探讨。本次探讨选用了介孔材料ZVI-SBA-15作为探讨的对象，通过FT-IR、X射线衍射、N2吸附/脱附等温线、TEM等对其进行实验，表明FeOx是SBA-15中的铁盐煅烧后的主要存在形式，ZVI-SBA-15在经过煅烧和还原后仍保持了SBA-15的介孔有序结构。当吸附剂的使用量在100mg以下时，去除率随着吸附剂的增加而显著提高；当吸附剂使用量在100～200mg时，砷去除率变化相对稳定，说明此时对As(Ⅲ)的吸附已经趋于饱和。具有较好的吸附As(Ⅲ)的能力。在吸附剂是200mg，砷的初始浓度为5mg•L-1的溶液50ml，pH为6的条件下，吸附时间为18个小时，去除率能够提高到92.8%。57236

因此，ZVI-SBA-15具有较好的潜在应用价值。

毕业论文关键词：吸附，介孔材料，SBA-15，ZVI-SBA-15，吸附时间

Abstract：This paper, according to the theory of natural arsenic pollution are studied, the preparation of synthetic ZVI-SBA-15 and characterization, and test its performance of arsenic in water environment treatment. The research content as follows: the surface of the mesoporous materials ZVI-SBA-15 modification and adsorption of arsenic ion research. This study selects the mesoporous materials ZVI-SBA-15 as the research object, through the FT-IR, X-ray diffraction (XRD), N2 isothermal adsorption/stripping, TEM, etc on the characterization, shows that FeOx is iron salts of SBA - 15 after calcining the main existence form, ZVI-SBA-15 after calcination and reduction remains the SBA - 15 orderly mesoporous structure. When the adsorbent under 100 mg, considerably increase the removal rate increased with the increase of adsorbent; When the content of the adsorbent in 100 ~ 100 mg, arsenic removal rate changes tend to be stable, that at this time of the As (Ⅲ) adsorption into balance. Has good adsorption As (Ⅲ) ability. In adsorbent is 200 mg, initial concentration of arsenic is 5mg•L-1 of 50ml solution, pH of 6 conditions, adsorption time for 18 hours, removal rate can reach 92.8%.

Therefore, ZVI-SBA-15 has good potential application value.

Key words: adsorption,mesoporous materials,SBA-15,ZVI-SBA-15,adsorption time

1 绪论 5

2 实验部分 6

2.1 主要试剂和药品 6

2.2 试验仪器 7

2.3 表征手段 7

2.4 试验方法 8

2.4.1 材料的合成 8

2.4.2 材料的吸附性能研究 8

3 结果与讨论 9

3.1 FTIR分析 9

3.2 X射线衍射 9

3.3 N2吸附/脱附等温线 10

3.4 TEM 11

3.5 ZVI-SBA-15对砷吸附 11

3.5.1 附剂投入量对As(Ⅲ)去除率的影响 11

3.5.2吸附时间对去除率的影响的动力学研究 12

结论 14

参考文献 15

致谢 17

1 绪论

砷元素是一种在自然界中极其普遍的元素，因为它具有极高的毒性和致癌性，所以引起全世界的急切关注。长时间的引用暴露在外的水会使肝，肺，肾，膀胱，和皮肤致癌以及皮肤增厚（角化），神经系统疾病，肌肉无力，食欲不振和呕吐[1–3]。为了减少这些对身体健康的风险，世界卫生组织(WHO)严格规定了砷浓度不得超过10ppb(10μg/L) [4]，这已经被许多国家采用为饮用水的标准。