铁基磷酸化二氧化钛复合材料的合成与吸附重金属性能研究  

Synthesis of iron-based phosphorylated titanium dioxide composite and its adsorption capacity for heavy metals

作　　者：孟佩佩 蔡嘉哲 苏耀明 任静静 周倩雅 郑刘春[2,4,5] MENG Peipei;CAI Jiazhe;SU Yaoming;REN Jingjing;ZHOU Qianya;ZHENG Liuchun(College of Environment,Jinan University,Guangzhou 511442;School of Environment,South China Normal University,Guangzhou 510006;South China Institute of Environmental Sciences,Guangzhou 510655;Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety,South China Normal University,Guangzhou 510006;MOE Key Laboratory of Theoretical Chemistry of Environment,South China Normal University,Guangzhou 510006)

机构地区：[1]暨南大学环境学院,广州511442 [2]华南师范大学环境学院,广州510006 [3]生态环境部华南环境科学研究所,广州510655 [4]华南师范大学,广东省化学品污染与环境安全重点实验室,广州510006 [5]华南师范大学,教育部环境理论化学重点实验室,广州510006

出　　处：《环境科学学报》2023年第5期238-248,共11页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.52170035);广东省重点领域研发计划项目(No.2019B110207001);中央级公益性科研院所基本科研业务专项(No.PM-zx703-201803-069);广州市民生科技攻关计划项目(No.201803030001)。

摘　　要：在水解法合成二氧化钛(TiO_(2))过程中,同步利用共沉淀方法以不同的方式在TiO_(2)结构中赋予含P和含Fe基团,制备出铁基磷酸化复合材料P-FeN-TiO_(2)和FeP-TiO_(2),并借助SEM、EDS和FTIR等表征分析材料吸附前后的结构形貌、元素组成和基团构成等.然后,在不同的pH值、温度和溶液初始浓度等条件下开展材料吸附水体中Cd(Ⅱ)的性能测试.结果表明,在pH值为6时,P-FeN-TiO_(2)和FeP-TiO_(2)对Cd(Ⅱ)吸附性能最佳,其最大理论吸附量分别为62.50 mg·g^(-1)和4.37 mg·g^(-1).相比而言,P-FeN-TiO_(2)的吸附性能要优于FeP-TiO_(2).它们均属于以化学反应为主的单分子层吸附,且吸附容量随着温度升高而增加.由于重金属离子富集系数的差异性,在存在其他重金属离子的情况下,复合材料竞争吸附的顺序为Pb(Ⅱ)>Cu(Ⅱ)>Cd(Ⅱ).最后,通过XPS表征分析吸附行为,P-FeN-TiO_(2)和FeP-TiO_(2)主要通过Fe—OH、Fe—O、P—O等基团络合作用吸附Cd(Ⅱ).而且,含Fe和含P基团的先后赋予TiO_(2)结构要比磷酸铁盐赋予形式的效果更好.因此,P-FeN-TiO_(2)基团含量更多,吸附性能也更优.In the process of hydrolysis synthesis for titanium dioxide(TiO_(2)),the iron based phosphorylated composite P-FeN-TiO_(2) and FeP-TiO_(2) were prepared by simultaneously using coprecipitation method to endow groups containing P and Fe in TiO_(2) structure in different ways,and the structural morphology,element composition and group composition of the materials before and after adsorption were characterized and analyzed by SEM,EDS and FTIR.Besides,the performance tests of the materials adsorbing Cd(Ⅱ)in water were carried out under different pH,temperature and initial concentration of the solution.The results showed that P-FeN-TiO_(2) and FeP-TiO_(2) had the best adsorption capacity for Cd(Ⅱ)at pH 6,and their maximum theoretical adsorption capacities were 62.50 mg·g^(-1) and 4.37 mg·g^(-1),respectively.In comparison,P-FeN-TiO_(2) had a better adsorption performance than FeP-TiO_(2),but both of them were monolayer adsorption dominated by chemical reactions,and the adsorption capacity increased with the increase of temperature.Due to the difference of enrichment coefficients of heavy metal ions,the competitive adsorption order of composite was Pb(Ⅱ)>Cu(Ⅱ)>Cd(II)in the presence of other heavy metal ions.Finally,summarized by XPS characterization and analysis of adsorption behavior,it was concluded that P-FeN-TiO_(2) and FeP-TiO_(2) mainly adsorbed Cd(Ⅱ)through the coordination of Fe—OH,Fe—O,P—O and other groups.Moreover,the TiO_(2) structure endowed successively by Fe and P groups had a better effect than the form endowed with ferric phosphate.Therefore,the more group contents P-FeN-TiO_(2) had,the better adsorption performance it obtained.

关 键 词：二氧化钛(TiO2) 共沉淀 复合材料 吸附 重金属 机理 

分 类 号：X703[环境科学与工程—环境工程]