| 岳先名,李国莲,李振宇,谢发之.镁铝双氢氧化物改性D331 树脂对磷的吸附性能研究[J].安徽建筑大学学报,2019,27(1):50-56 |
| 镁铝双氢氧化物改性D331 树脂对磷的吸附性能研究 |
| Adsorption properties of Mg-Al-LDH modified D331 resin on phosphorus |
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| DOI： |
| 中文关键词: 层状双氢氧化物 树脂 磷 改性 吸附 |
| 英文关键词: Layered double hydroxides resin phosphorus modification adsorption |
| 基金项目:国家自然科学基金项目(21777001)，安徽省自然科学基金项目(1608085MB43)，安徽省教育厅自然科学研究重大项目
(KJ2018ZD049) |
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| 中文摘要: |
| 采用共沉淀法制备的镁铝双氢氧化物(Mg-Al-LDH)改性D331 树脂(大孔丙烯酸系弱碱阴离子交换树
脂)制备了一种磷吸附材料，考察了磷初始浓度、pH、共存离子、温度等因素对改性树脂吸附磷的影响。结果
表明溶液pH 值从2.56 升高到5.71 时，改性树脂对磷的吸附能力逐渐提升，最大吸附量为42.51 mg/g；随着
吸附剂投加量的增加，当吸附剂投加量由0.7 g/L 增加到2 g/L 时，改性树脂对水中磷的去除率，由62.46% 逐
渐增加到92.34%；温度的升高，有利于改性树脂对水中磷的吸附，ΔG<0，说明吸附过程自发进行，吸附等温
线符合Freundlich 模型；吸附时间在前9h 内，吸附量从8.38 mg/g 升高到36.63 mg/g，增加了337.1%，吸附
动力学可用准二级动力学方程来描述。溶液中的阴离子对改性树脂的吸附有一定的影响，其影响顺序为，
CO3
2－>SO4
2－>NO3
－；通过表征分析，改性树脂对磷酸盐的吸附机理，可能是树脂与磷酸根之间的化学吸附，
形成了内层络合物。 |
| 英文摘要: |
| Coprecipitated Mg-Al double hydroxide (Mg-Al-LDH) modified D331 resin (acrylic macroporous weak base anion
exchange resin) was developed for phosphorus adsorption from aqueous solutions. Effects of initial phosphorus concentration，
pH， coexisting ions， temperature and other factors on phosphorus adsorption were investigated. The results
showed that the phosphorus adsorption capacity of modified D331 resin was obviously increased with increasing pH
from2.56 to 5.71，and the maximum adsorption capacity was 42.51 mg/g. When the dosage of adsorbent increased from
0.7g/L to 2g/L，the removal efficiency of phosphate was increased from 62.46% to 92.34%. Increasing the temperature is
beneficial to phosphorus adsorption. ΔG<0 indicates that the adsorption process proceeds spontaneously and the adsorption
isotherm is well described by Freundlich model. The adsorption capacity increased from 8.38 mg/g to 36.63 mg/g within
the 9 hours. The adsorption kinetics is well fitted pseudo second-order model. The phosphorus adsorption was affected coexisting
anions in the order of CO3
2－>SO4
2－>NO3
－. Characterization of adsorbent by FTIR before and after adsorption revealed
that chemical adsorption and forming inner complex contributed to the adsorption process. |
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