Ce-Zr负载污泥基生物炭吸附水中PO_(4)^(3−)的性能与机制  

Performance and mechanism of PO_(4)^(3−)-P adsorption in water on Ce-Zr loaded sludge-based biochar

作　　者：郭志月 王毅力[1] 刘晨阳 李小林 陶雪 GUO Zhiyue;WANG Yili;LIU Chenyang;LI Xiaolin;TAO Xue(College of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China;The Institute of Seawater Desalination and Multipurpose Utilization,Tianjin 300192,China;Department of Resources and Environmental Engineering,Shanxi University of Energy,Shanxi 030606,China;Department of Resources and Environment,Moutai Institute 564507,China)

机构地区：[1]北京林业大学环境科学与工程学院,北京100083 [2]自然资源部天津海水淡化与综合利用研究所,天津300192 [3]山西能源学院资源与环境工程系,山西030606 [4]茅台学院资源环境系,仁怀564507

出　　处：《环境工程学报》2024年第12期3517-3527,共11页Chinese Journal of Environmental Engineering

基　　金：北京市科技计划课题项目(Z181100005518007);国家重点研发计划项目(2017YFC0505303);贵州省科技计划资助项目(黔科合基础-ZK[2021]一般282)。

摘　　要：磷资源的短缺和含磷废水排放造成的水体富营养化是目前关注的热点问题。本研究采用溶剂热法制备出了以污泥基生物炭为载体、负载Ce-Zr双金属的吸附剂SZCCO(Zr-Ce CO_(3)^(2−)sludge-based biochar)。通过XRD、SEM、FTIR、XPS等对SZCCO进行了表征,探讨了SZCCO吸附PO_(4)^(3−)-P的等温线、动力学、影响因素,解析了相应的吸附机制。结果表明,SZCCO吸附PO_(4)^(3−)-P的等温线符合Langmuir的吸附等温线模型,拟合的饱和吸附量可达93.78 mg·g^(−1)。吸附动力学曲线符合准二级动力学模型,表明该吸附过程主要为化学吸附。在pH为2.0~10.0时,SZCCO对PO_(4)^(3−)-P的吸附量均保持在70 mg·g^(−1)以上。Cl^(–)、NO_(3)^(–)、SO_(4)^(2−)、HCO_(3)^(−)、溶解性有机物腐殖酸(HA)等的共存对PO_(4)^(3−)-P的吸附影响较小,表明SZCCO对PO_(4)^(3−)-P具有良好的吸附选择性。经过5次吸附再生后,对PO_(4)^(3—)P的吸附量仍保持在初始吸附量的95%左右,具有较强的重复利用性,利用XRD对再生后的SZCCO进行表征,结果表明再生产物为Ce(CO_(3))_(2)和ZrO_(2)。采用SZCCO为填料的吸附柱处理初始PO_(4)^(3−)-P质量浓度为5 mg·L^(−1)的二沉池出水的配水,穿透体积可达1849 BV,动态吸附量为44.99 mg·g^(−1)。吸附前后SZCCO的Zeta电位、FTIR和XPS图谱的变化分析结果表明SZCCO吸附PO_(4)^(3−)-P的主要机制为静电作用、表面—OH和CO_(3)^(2−)与PO_(4)^(3−)-P之间的配体交换,配体交换产物为CePO4和Zr(PO3)4。The shortage of phosphorus resources and the eutrophication caused by the discharge of wastewater containing phosphorus are the hot issues at present.In this study,a type of SZCCO adsorbent(Zr-Ce CO_(3)^(2−)sludge-based biochar)was synthesized with sludge-based biochar as the carrier and Ce-Zr bimetallic loading by a solvothermal method.XRD(X-ray diffraction),SEM(Scanning Electron Microscope),FTIR(Fourier Transform Infrared Spectroscopy),XPS(X-ray Photoelectron Spectroscopy)and other advanced instruments were used to characterize the SZCCO.The isotherm,kinetics and influencing factors of PO_(4)^(3−)-P adsorption on the SZCCO were studied,and the corresponding adsorption mechanism was analyzed.The results indicate that the isotherm models of SZCCO adsorption to PO_(4)^(3−)-P conforms to Langmuir model,and the fitted maximum adsorption capacity can reach 93.78 mg·g^(−1).The adsorption kinetics curve conforms to the pseudo-second-order models,suggesting that PO_(4)^(3−)-P adsorption on the SZCCO could be controlled by the chemical adsorption.Within the pH range of 2.0~10.0,the adsorption capacity remained above 70 mg·g^(−1).The coexistence of Cl−、NO_(3)^(–)、SO_(4)^(2−)、HCO_(3)^(−)and humic acid(HA)has slight effect on the adsorption of PO_(4)^(3−)-P,indicating that SZCCO has a good adsorption selectivity towards PO_(4)^(3−)-P.After 5 cycles of adsorption regeneration,its adsorption capacity still remained around 95%of the initial adsorption capacity,indicating the strong reusability of SZCCO;the regenerated SZCCO was characterized by XRD,Ce(CO_(3))_(2)and ZrO_(2)occurred on it.The adsorption column with SZCCO as the packing material was used to treat the effluent of the secondary settling tank with the initial PO_(4)^(3−)-P mass concentration of 5 mg·L^(−1),the penetration volume could reach~1849 BV,and the dynamic adsorption capacity was~44.99 mg·g^(−1).Compared with the Zeta potential,FTIR,and XPS spectra of SZCCO before and after adsorption,the main adsorption mechanism to

关 键 词：污泥基生物炭 Ce-Zr双金属负载 PO_(4)^(3−)-P 静电作用 配体交换 

分 类 号：X703[环境科学与工程—环境工程]