摘要
采用Na OH浸泡的方法制备荔枝壳吸附剂,考察了初始Cu(Ⅱ)质量浓度、荔枝壳用量、p H值和吸附温度对Cu(Ⅱ)的吸附量及去除率的影响.动力学和热力学研究结果发现,该吸附过程符合准二级吸附动力学模型和Langmuir吸附等温线.从电镜图片可以看到,荔枝壳吸附后表面开裂变得更加粗糙,说明荔枝壳在吸附铜离子后,其化学结构受到破坏.红外光谱分析表明荔枝壳吸附铜离子的主要基团可能为羟基和酰胺基,XRD分析发现吸附后的衍射峰比吸附前的峰要尖锐,说明荔枝壳吸附铜离子后结晶性增强.
The lychee exocarp modified by NaOH was used to adsorb Cu （Ⅱ） from aqueous solution .The factors affecting the amount of copper adsorbed and the percent copper removal including the initial Cu （Ⅱ） concentration , dosage ,pH value and temperature were investigated in this study .The analysis of dynamics and thermodynamics found that the adsorption process was consistent with the pseudo -second-order model and Langmuir equation .The SEM images showed the surface of lychee exocarp cracked and became rougher after adsorption ,which indicated that the chemical structure of adsorbent was damaged after adsorption .It was also revealed that the main chemical functional groups affecting Cu （Ⅱ） adsorption were hydroxyl and amide by FT-IR analysis and the diffraction peaks became sharper after adsorption meaning enhanced crystallinity by XRD analysis .
出处
《吉林师范大学学报（自然科学版）》
2015年第3期115-119,共5页
Journal of Jilin Normal University:Natural Science Edition
基金
国家水体污染控制与治理重大科技项目(2014ZX07215-001)
福建省自然科学基金项目(2015J01356)
漳州职业技术学院科研项目(ZZY1412)
