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采用人工合成水铁矿Ferror Mox(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p H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 m L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.
Ferroferric oxide (FM) was used as adsorbent for the treatment of phosphorus-bearing waste water.The 2 L hydrothermal iron with amorphous FM was determined by SEM, EDS, XRD, FTIR and Raman analysis, and was mainly composed of Fe, O, Ca, Si, etc. The effect of different materials on the phosphorus removal efficiency of FM was studied through the experimental study of the effect of the material as a phosphorus removal adsorbent, and the mechanism of phosphorus removal was analyzed.The results showed that in the The initial pH of phosphate solution was 2, the relative dosage was 7 g · L -1, the reaction temperature was 25 ℃, the initial phosphorus concentration was 10 mg · L -1, The removal rate of phosphate reached 99.14% under the condition of the volume of 50 m L. The adsorption isotherms at different temperatures all satisfied the Langmuir isotherm model with a correlation coefficient above 0.95. From the thermodynamic parameters, the phosphate adsorption The reaction belongs to the spontaneous (endothermic) endothermic reaction. The reaction of FM to remove phosphate can be described by quasi-first-order kinetic model and quasi-second-order kinetic model. It can be seen from regeneration experiments that 0.1 mol·L -1 Of the sodium hydroxide solution can make about 99% of phosphate adsorbed on FM desorption down. , FM is suitable as an adsorbent for treating phosphorus-containing wastewater.