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铁/铝泥免烧陶粒对Tl(Ⅰ)的吸附性能

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为探究给水厂残泥免烧陶粒(UCWTR)作为吸附剂用于含铊(Tl(Ⅰ))废水治理的可行性,采用免烧法制备出铝泥免烧陶粒(UCWTR-Al)和铁泥免烧陶粒(UCWTR-Fe)用于水中Tl(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Tl(Ⅰ)的吸附特性,并探究了两种陶粒对Tl(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Tl(Ⅰ)的吸附过程.Langmuir模型拟合UCWTR-Al和UCWTR-Fe最大吸附量分别为5.360 mg·g-1和5.421 mg·g-1,且其吸附量与pH值呈正相关.共存离子实验表明K+对Tl(Ⅰ)吸附的抑制作用最为显著.吸附(Tl(Ⅰ))后UCWTR-Al和UCWTR-Fe中Tl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-Al 和 UCWTR-Fe 所含的 Al/Fe—O、Si—O—Si、O—Ca—O、—OH 基团可与 Tl(Ⅰ)发生化学吸附,形成了 Fe/Al—O—Tl的络合物和C—S—H凝胶与Tl结合的螯合产物.研究结果证实了UCWTR-Al和UCWTR-Fe是一种稳定去除Tl(Ⅰ)的高效吸附剂,为其在含Tl(Ⅰ)废水治理的实际应用提供了科学依据与技术支撑.
Characteristics of Thallium(Ⅰ)adsorption by ferric/aluminum-based unburned ceramiste water treatment residuals
Inorder to explore the feasibility of using unburned ceramsite water treatment residuals(UC-WTR)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 suit-able to describe the adsorption process of Tl(Ⅰ)by two kinds of ceramsite.The maximum adsorption ca-pacities 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—Oand—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 ap-plication in the treatment of thallium-containing wastewater.

Tl(Ⅰ)aluminum-based unburned ceramiste water treatment residualsferric-based unburned ceramiste water treatment residualsadsorption

卿英俊、张俊丰、付广义、赵媛媛

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湘潭大学环境与资源学院,湖南湘潭 411105

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

Tl(Ⅰ) 铝泥免烧陶粒 铁泥免烧陶粒 吸附

湖南省重点研发计划湖南省重点研发计划湖南省环保科研课题

2022NK20602019SK2291HBKT-2021023

2024

湘潭大学学报(自然科学版)
湘潭大学

湘潭大学学报(自然科学版)

CSTPCD
影响因子:0.403
ISSN:2096-644X
年,卷(期):2024.46(4)