柚子皮对铬的吸收状况的研究
关键词： 柚子皮；椰壳粉；Cr(VI)；吸附
Adsorption of Pomelo Peel to Cr(Ⅵ)
Abstract: Grind the dry pomelo peel to produce adsorbent of pomelo peel by mortar. Firstly, make out the standard curve and the preliminary experiment were carried out. The results showed that the optimum dosage of adsorbent is 0.5 g for the removal of 5 mg/L Cr(VI). At the same time, we discussed the adsorption effect of pomelo peel from different aspects, such as the adsorbent dosage, the initial concentration of Cr (VI) and the adsorption time. Finally, we discussed the adsorption effect of coconut shell under the same condition of the research compared with the adsorption effect of pomelo peel, which makes better to discuss the condition of adsorption. The removal of 5 mg/L Cr (VI) can reach more than 83% with the adsorbent of 0.5 g for 50 min. By comparison, the removal rate of Cr (VI) by adsorbent of coconut shell is 70% in the same condition. It shows that the adsorption effect of pomelo peel for Cr (VI) has a good capacity of adsorption.
Key Words： Pomelo peel; Coconut shell powder; Cr(VI); adsorption.
目 录
第一章 绪论 1
1.1 含重金属饮用水来源及其危害 1
1.2 生物材料吸附剂 2
1.3 生物吸附剂的吸附机理 2
1.4 影响生物吸附的因素 2
1.4.1 PH值 2
1.4.2 吸附时间 3
1.4.3 温度 3
1.4.4 吸附剂粒径 3
1.5 农林废弃物直接用作金属离子吸附剂 3
1.6 柚子皮作为金属离子吸附剂 4
2.1 本研究背景、意义及主要内容 4
2.1.1 选题背景和意义 4
2.1.2 需要解决的关键问题及主要研究内容 5
第二章 实验材料与方法 5
3.1 试剂和仪器 5
3.1.1 主要材料 5
3.1.2 主要试剂 6
3.1.3 主要仪器 6
3.1.4 主要工具 6
3.2 样品制备 7
3.2.1 吸附剂的制备 7
3.2.2 配制实验所需溶液 7
3.3 制标准曲线 7
3.4 预实验 8
3.5 吸附实验 8
3.5.1 研究吸附剂添加量对吸附效果的影响 8
3.5.2 研究吸附时间对吸附效果的影响 9
3.5.3 研究不同浓度对吸附效果的影响 9
3.6 数据处理 9
第三章 讨论与结论 9
4.1标准曲线 9
4.2 吸附剂投加量对吸附效果的影响 10
4.3 吸附时间对吸附效果的影响 13
4.4 不同Cr(VI)浓度对吸附效果的影响 16
4.5结论 19
致谢 20