摘要
为探索一种改良的磷酸盐吸附材料,以优化其在去除富营养化水体中无机磷的应用效果,提出了一种纳米羟基铁(FeOOH)与阴离子交换树脂D-201复合的方法。首先将FeOOH分散于阴离子交换树脂D-201中,得到FeOOH@D-201复合树脂。然后进行批量吸附实验,通过比较FeOOH@D-201与纯D-201对磷酸盐的吸附量来评估其改善程度。并采用准二级动力学模型和Langmuir吸附等温线模型进行拟合,从而分析复合树脂的吸附过程及其机理。结果表明,FeOOH@D-201复合树脂的最大磷酸盐吸附量达到了132.1 mg/g,比纯D-201的吸附量提高了46%,突破了常规阴离子交换树脂在去除无机磷应用中的局限性。模型拟合结果表明,其吸附过程与准二级动力学模型和Langmuir模型较吻合,推断吸附机理主要是静电吸引和配位络合的共同作用。FeOOH@D-201经过5次醋酸脱附-吸附再生循环后,吸附剂去除磷酸盐的能力仍然保持在70.4%以上,证实了复合树脂的良好再生性能。
The purpose of this study was to explore an improved phosphate adsorption material to optimize its application in the removal of inorganic phosphorus from eutrophic water.In this paper,a composite method of nano-hydroxyl iron(FeOOH) and anion exchange resin D-201 was proposed.FeOOH@D-201 composite resin was initially obtained by dispersing nano-hydroxyl iron in anion exchange resin D-201.Then,batch adsorption experiments were carried out to evaluate the improvement by comparing the phosphate adsorption capacity of FeOOH@D-201 and pure D-201.The quasisecond-order kinetic model and Langmuir adsorption isotherm model were fitted to analyze the adsorption process and mechanism of the composite resin.The results showed that the maximum phosphate adsorption capacity of FeOOH@D-201 composite resin was 132.1 mg/g,which was 46% higher than that of pure D-201,and broken through the limitations of conventional anion exchange resin in the removal of inorganic phosphorus.The model fitting results showed that the adsorption process was in good agreement with the quasi-second-order kinetic model and Langmuir model,and it was inferred that the adsorption mechanism was mainly electrostatic attraction and coordination.After five acetic acid desorption and adsorption regeneration cycles of FeOOH@D-201,the phosphate removal ability of the adsorbent remained above 70.4%,which confirmed the good regeneration performance of the composite resin.
作者
李曼
祁丽
彭静波
LI Man;QI Li;PENG Jingbo(Department of Environmental Engineering,Henan Vocational College of Water Conservancy and Environment,Zhengzhou 450008,China;School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;CHN Energy Xingyang Thermal Power Co.,Ltd.,Zhengzhou 450100,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2024年第5期88-94,共7页
Industrial Water Treatment
基金
国家自然基金青年基金项目(2018Z14_0418)
天津市教委科研项目(2019KJ110)。
关键词
纳米羟基铁
阴离子交换树脂
吸附除磷
nano-hydroxyl iron
anion exchange resin
phosphorus removal by adsorption
