铁/铝泥免烧陶粒对Tl(I)的吸附性能  

Characteristics of Thallium(I) adsorption by ferric/aluminum-based unburned ceramiste water treatment residuals

作　　者：卿英俊 张俊丰 付广义 赵媛媛 QING Yingjun;ZHANG Junfeng;FU Guangyi;ZHAO Yuanyuan(College of Environment and Resources,Xiangtan University,Xiangtan 411105,China;Key Laboratory of Water Pollution Control Technology,Hunan Research Academy of Environmental Sciences,Changsha 410014,China)

机构地区：[1]湘潭大学环境与资源学院,湖南湘潭411105 [2]湖南省环境科学保护研究院水污染控制技术重点实验室,湖南长沙410014

出　　处：《湘潭大学学报（自然科学版）》2024年第4期1-13,共13页Journal of Xiangtan University(Natural Science Edition)

基　　金：湖南省重点研发计划项目(2022NK2060,2019SK2291);湖南省环保科研课题项目(HBKT-2021023)。

摘　　要：为探究给水厂残泥免烧陶粒(UCWTR)作为吸附剂用于含铊(T1 (I))废水治理的可行性,采用免烧法制备出铝泥免烧陶粒(UCWTR-A1)和铁泥免烧陶粒(UCWTR-Fe)用于水中T1 (I)的吸附研究.通过批量吸附、改进三级连续提取法(BCR法)分级提取、傅里叶变换红外光谱(FT-IR)和X射线光电子能谱(XPS)等方法分析了两种陶粒对水中T1 (I)的吸附特性,并探究了两种陶粒对T1 (I)的吸附机理.结果表明,准二级动力学模型更适合描述两种陶粒对T1 (I)的吸附过程.Langmuir模型拟合UCWTR-A1和UCWTR-Fe最大吸附量分别为5.360mg·g^(-1)和5.421mg·g^(-1),且其吸附量与p H值呈正相关.共存离子实验表明K^(+)对T1 (I)吸附的抑制作用最为显著.吸附(T1 (I))后UCWTR-A1和UCWTR-Fe中T1的赋存形态主要以可还原态存在.FT-IR、XPS等表征分析显示,UC-WTR-A1和UCWTR-Fe所含的A1/Fe—O、Si—O—Si、O—Ca—O、—OH基团可与T1 (I)发生化学吸附,形成了Fe/A1—O—T1的络合物和C—S—H凝胶与T1结合的螯合产物.研究结果证实了UCWTR-A1和UCWTR-Fe是一种稳定去除T1 (I)的高效吸附剂,为其在含T1 (I)废水治理的实际应用提供了科学依据与技术支撑.In order to explore the feasibility of using unburned ceramsite water treatment residuals(UCWTR)as adsorbent to treat thallium-containing wastewater,aluminum-based unburned ceramiste water treatment residuals(UCWTR-Al)and ferric-based unburned ceramiste water treatment residuals(UCWTR-Fe)were prepared by the burning-free method for the study of Tl(I)adsorption in wastewater.The adsorption characteristics of the two ceramsites for Tl(I)in wastewater were analyzed by batch adsorption,improved BCR method for hierarchical extraction,FT-IR and XPS,and the adsorption mechanism of Tl(I)was explored.The results show that the quasi-second-order kinetic model is more suitable to describe the adsorption process of Tl(I)by two kinds of ceramsite.The maximum adsorption capacities of UCWTR-Al and UCWTR-Fe fitted by Langmuir model are 5.360 mg·g^(-1)and 5.421 mg·g^(-1),respectively,and the adsorption capacity is positively correlated with pH value.Coexisting ion experiment shows that K^(+)has the most significant inhibitory effect on Tl(I).After adsorption,the existing forms of Tl in UCWTR-Al and UCWTR-Fe are mainly reducible.FT-IR and,XPS characterization analysis show that Al/Fe—O,Si—O—Si,O—Ca—O and—OH groups contained in UCWTR-Al and UCWTR-Fe can chemically adsorb with Tl(I),forming Fe/Al—O—Tl complexes and chelated products of C—S—H gel combined with Tl.The research results confirmed that UCWTR-Al and UCWTR-Fe are efficient adsorbents for the stable removal of Tl(I),which provided scientific basis and technical support for their practical application in the treatment of thallium-containing wastewater.

关 键 词：T1(I) 铝泥免烧陶粒 铁泥免烧陶粒 吸附 

分 类 号：X52[环境科学与工程—环境工程]