铈改性净水污泥除磷效能与机理分析  

Performance and mechanism analysis of phosphorus removal by ceriummodified drinking water treatment residual

作　　者：程文雨 马潇莹 陈浩宇 陈荣升 王东田[1,2] CHENG Wenyu;MA Xiaoying;CHEN Haoyu;CHEN Rongsheng;WANG Dongtian(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215000,China;School of Chemistry and Life Sciences,Suzhou University of Science and Technology,Suzhou 215000,China)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215000 [2]苏州科技大学化学与生命科学学院,苏州215000

出　　处：《环境工程学报》2024年第1期51-62,共12页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金面上资助项目(51778392)。

摘　　要：磷酸盐含量是控制水环境质量的重要标准之一,吸附是一种高效、清洁和经济的除磷技术。采用铈改性净水污泥吸附去除磷酸盐,考察了铈负载量、投加量、pH、共存离子等因素对吸附磷酸盐的影响,探讨了可能的吸附机理及吸附材料循环再生能力。结果表明,铈改性净水污泥吸附磷酸盐过程符合拟二级动力学和Freundlich吸附等温线,最大吸附量为69.43 mg·g^(-1),吸附速率受内扩散、边界层效应等多重因素的限制。在Cl^(-)、NO_(3)^(-)、CO_(3)^(2-)、SO_(4)^(2-)等共存离子干扰下,铈改性净水污泥具备选择性吸附磷酸盐的能力。在进行5次吸附-解吸循环后,吸附材料对磷酸盐的去除率下降了25.4%。吸附机制主要为磷酸盐与羟基以及含铈基团的静电吸引和配体交换。Phosphate content is one of the important criteria for controlling the quality of the water environment,and adsorption is an efficient,clean,and economical technique for phosphate removal.In this study,cerium-modified drinking water treatment residual was used to remove phosphate by adsorption,and the effects of cerium loading,dosage,pH,and coexisting ions on phosphate adsorption were investigated to explore the adsorption mechanism and the cyclic regeneration capacity of adsorbent materials.The results showed that the phosphate adsorption process of cerium-modified drinking water treatment residual was consistent with the proposed secondary kinetics and Freundlich adsorption isotherm,and the maximum adsorption capacity was69.43 mg·g^(-1).The adsorption rate was controlled by multiple factors,such as internal diffusion and the boundary layer effect.The cerium-modified drinking water treatment residual had the ability to selectively adsorb phosphate at the interference of co-existing ions such as Cl_(-),NO_(3)^(-),CO_(3)^(2-),SO_(4)^(2-),etc.After five adsorptiondesorption cycles,the removal rate of phosphate by the adsorbent material decreased by 25.4%.The adsorption mechanism is mainly electrostatic attraction and ligand exchange between phosphates and hydroxyl groups as well as cerium-containing groups.

关 键 词：除磷 净水污泥 铈基吸附剂 配体交换 

分 类 号：X703[环境科学与工程—环境工程]