过氧化钙/海泡石海藻酸钠缓释凝胶复合材料的制备及其对内源磷的控制性能  

Preparation of Lanthanum Crosslinked Calcium Peroxide/Sepiolite/Sodium Alginate Composite Hydrogels and Their Elimination Performance for Endogenous Phosphorus

作　　者：曲思彤 单苏洁 王崇铭 吴玲予 李大鹏[1,2] 黄勇[1,2] QU Si-tong;SHAN Su-jie;WANG Chong-ming;WU Ling-yu;LI Da-peng;HUANG Yong(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Environment Biotechnology Research Institute,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009 [2]苏州科技大学环境生物技术研究所,苏州215009

出　　处：《环境科学》2024年第4期2160-2170,共11页Environmental Science

基　　金：国家自然科学基金项目(51778393)。

摘　　要：以载纳米过氧化钙海泡石为基本骨架,采用海藻酸钠包覆和镧离子交联研制了CPS60@SA/La复合材料,通过批量吸附实验和表征分析考察了其对富营养化水体中磷的去除效果及机制.结果表明,所制材料具有良好的释氧性和除磷能力,纳米过氧化钙和镧位点是其主要的活性组分.随着缓释凝胶用量增加,磷的去除率也相应增加;CPS60@SA/La对高浓度磷的去除过程符合准二级动力学模型和Langmuir吸附等温模型的描述,最大吸附容量为198.25 mg·g^(-1) (20℃);CPS60@SA/La在p H 3~9范围内均对磷酸盐有良好的去除能力,F^(-)、HCO_(3)^(-)、CO_(3)^(2-)和HA的共存对CPS60@SA/La的除磷效果有轻微抑制作用;在实际河道水体中,该复合材料可缓慢释氧,保持水体溶解氧浓度大约为8.51 mg·L^(-1),为泥水界面处的好氧微生物提供良好条件,对上覆水和间隙水中的磷酸盐均有良好的去除和固定能力,去除效果稳定,其使用有望提升水体自净能力.CPS60@SA/La composites were developed through sodium alginate coating and lanthanum ion crosslinking using nano-calcium peroxide-loaded sepiolite as the basic skeleton.Then,their phosphorus removal performance and mechanisms in eutrophic water bodies were investigated through batch adsorption experiments and characterization analyses.The results showed that as-prepared composites had good oxygen release and phosphorus removal ability,and nano-calcium peroxide and lanthanum sites were recognized as the main active components.With the increase in the CPS60@SA/La hydrogel dosage,the phosphorus removal efficiencies increased accordingly.The removal process of CPS60@SA/La for high-concentration phosphorus followed the description of the pseudo-second-order kinetic model and Langmuir isotherm model,with a maximum adsorption capacity of 198.25 mg·g^(−1)(20℃).The as-prepared CPS60@SA/La exhibited good phosphate removal performance in the pH range of 3-9,and the coexistence of F^(−),HCO_(3)^(−),CO_(3)^(2−),and HA had a slight inhibition effect on the phosphorus removal by CPS60@SA/La.In the actual river water,CPS60@SA/La composites could slowly release oxygen and maintain the concentration of dissolved oxygen of approximately 8.51 mg·L^(−1),which could provide good conditions for the aerobic microorganisms at the sediment-water interface,with good removal and inactivation ability for phosphate in both overlying and pore water,and their removal performance was stable.Thus,its use is expected to enhance the self-purification ability of surface water bodies.

关 键 词：富营养化控制 过氧化钙 镧(La) 缓释凝胶 磷(P) 海藻酸钠(SA) 

分 类 号：X524[环境科学与工程—环境工程]