| 人工合成水铁矿对含磷废水的吸附性能 |
| 摘要点击 2752 全文点击 1616 投稿时间：2016-01-14 修订日期：2016-04-19 |
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| 中文关键词 水铁矿 形态表征 等温吸附 热力学 动力学 解吸 |
| 英文关键词 ferrihydrite characterization of morphology isothermal adsorption thermodynamics dynamics desorption |
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| 中文摘要 |
| 采用人工合成水铁矿FerrorMox（FM）作为处理含磷废水的吸附剂.利用SEM、EDS、XRD、FTIR和Raman等分析手段确定FM为无定形状态的2 L水铁矿，主要由Fe、O、Ca、Si等元素组成.通过实验考察该材料作为除磷吸附剂的效果，研究了不同因素对FM除磷效率的影响，并对其吸附除磷的机制进行了分析.结果表明，在吸附时间60 min、磷酸盐溶液初始pH为2、相对投加量为7 g·L-1、反应温度为25℃、初始含磷浓度为10 mg·L-1、溶液体积为50 mL的条件下，磷酸盐的去除率达到99.14%；在不同温度下的吸附等温式均满足Langmuir等温吸附模型，相关系数达到0.95以上；由热力学参数可知，FM吸附磷酸盐的反应属于自发（式）的吸热反应；FM去除磷酸盐的反应用准一级动力学模型和准二级动力学模型均可以描述；通过再生实验可知，用0.1 mol·L-1的氢氧化钠溶液可以使99%左右吸附在FM上的磷酸盐解吸下来.因此，FM适合作为处理含磷废水的吸附材料. |
| 英文摘要 |
| The synthetic ferrihydrite, FerrorMox (FM), was used as adsorbent for removing phosphorus from wastewater. SEM, EDS, XRD, FTIR and Raman were used to characterize FM, and the results indicated that FM was amorphous 2 L ferrihydrite and was composed of Fe, O, Ca and Si, etc. Afterwards, FM was applied to adsorb phosphorus from wastewater, and the adsorption performance, influence factors and adsorption mechanism were investigated. The phosphorus removal rate reached 99.14% under the condition of adsorption time of 60 min, initial pH phosphate solution of 2, relative dosing quantity of 7 g·L-1, reaction temperature of 25℃, initial concentration of 10 mg·L-1, and solution volume of 50 mL. Adsorption isotherms were well fitted with the Langmuir isothermal adsorption model at different temperature with the correlation coefficient reaching above 0.95. The thermodynamic parameters showed that the phosphorus adsorption by FM was a spontaneous endothermic reaction. The phosphate removal kinetics well followed both pseudo-first-order model and pseudo-second-order model. About 99% of phosphate adsorbed on FM could be desorbed in 0.1 mol·L-1 NaOH solution. Therefore, FM was a promising absorbent material for the removal of phosphate from waste water. |
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