| 桉树遗态结构HAP/C复合材料对水中Cu (Ⅱ)的吸附特征 |
| 摘要点击 2639 全文点击 776 投稿时间：2016-08-14 修订日期：2016-10-18 |
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| 中文关键词 遗态结构 羟基磷灰石 Cu (Ⅱ) 动力学 热力学 吸附机制 |
| 英文关键词 relic structure hydroxyapatite Cu(Ⅱ) dynamics thermodynamics adsorption mechanism |
| 作者 | 单位 | E-mail | | 李超 | 桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心, 桂林 541004
桂林理工大学广西环境污染控制理论与技术重点实验室, 桂林 541004 | 1542598307@qq.com | | 朱宗强 | 桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心, 桂林 541004
桂林理工大学广西环境污染控制理论与技术重点实验室, 桂林 541004 | zhuzongqiang@glut.edu.cn | | 曹爽 | 河南电力勘测设计院, 郑州 450007 | | | 朱义年 | 桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心, 桂林 541004
桂林理工大学广西环境污染控制理论与技术重点实验室, 桂林 541004 | | | 谭笑 | 桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心, 桂林 541004
桂林理工大学广西环境污染控制理论与技术重点实验室, 桂林 541004 | | | 丁慧 | 桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心, 桂林 541004
桂林理工大学广西环境污染控制理论与技术重点实验室, 桂林 541004 | |
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| 中文摘要 |
| 采用自制桉树遗态羟基磷灰石/碳复合材料（PBGC-HAP/C）为吸附剂，溶液体系pH值、Cu（Ⅱ）初始浓度和材料粒径为影响因素，研究了PBGC-HAP/C吸附Cu（Ⅱ）的具体特征与机制.结果表明，当溶液为弱酸性时（pH=5），吸附效果最佳；增大反应体系初始浓度不利于吸附效果的提升；减小吸附剂粒径对吸附有促进作用.准二级动力学可准确描述该吸附过程，计算获取的吸附容量0.99、1.93和4.03 mg·g-1与实验值0.99、1.93和4.05 mg·g-1高度接近；Langmuir模型很好地拟合了吸附过程，表明吸附是单层吸附，温度升高有利于吸附进行；热力学实验结果ΔGθ<0、ΔSθ>0和ΔHθ>0，显示该吸附过程是自发、熵增的吸热过程.SEM、EDS、XRD和FTIR对吸附前后材料表征分析可知PBGC-HAP/C表面的含氧官能团与Cu（Ⅱ）发生的化学络合反应为主要净化机制，同时伴随着物理吸附、静电吸附和离子交换作用. |
| 英文摘要 |
| The specific characteristics and mechanism of adsorption of Cu(Ⅱ) were studied by using HAP/C composite (PBGC-HAP/C) as adsorbent, and using pH value of the solution system, initial concentration of Cu(Ⅱ) and particle size of the material as influential factors. The results showed that when the solution was weak acid (pH=5), the adsorption effect was the best; the increase of the initial concentration of the reaction system was not conducive to the enhancement of the adsorption effect; and the decrease of the particle size of the adsorbent facilitated the adsorption process. The pseudo-second-order kinetic model could accurately describe the adsorption process, and the calculated adsorption capacity(0.99, 1.93, 4.03 mg·g-1)was close to the experimental measured values(0.99, 1.93, 4.05mg·g-1); Langmuir model could fit the adsorption process very well, which indicated that adsorption was monolayer adsorption and the increase of temperature was conducive to adsorption. The thermodynamics test results of ΔGθ<0, ΔSθ>0 and ΔHθ>0 showed that the adsorption process was endothermic and spontaneous. Through comparative analysis of the SEM, EDS, XRD and FTIR of materials before and after adsorption, the results indicated that the chemical complexation reaction of Cu(Ⅱ) with the oxygen functional groups on the surface of PBGC-HAP/C was the main purification mechanism, which was accompanied with physical adsorption, electrostatic adsorption and ion exchange. |
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