锑在二氧化钛高能晶面上的吸附去除机理
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- 英文论文题名：Antimony adsorption on TiO_2(001) surface:Behavior and mechanism
- 论文作者：宋佳颖 ; 景传勇
- 英文论文作者：Jia-ying Song ; Chuan-yong Jing ; Research Center for Eco-Environmental Sciences ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中国科学院生态环境研究中心;
- 论文关键词：锑 ; 二氧化钛 ; 高能晶面 ; 砷锑共存 ; 吸附
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十六分会：环境化学
- 语种：中文
- 分类号：X52;O647.3
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十六分会 ; 环境化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：141k
- 原文格式：D
- 会议级别：全国
摘要
近年来,由工业发展及人类活动引起的水体锑(Sb)污染已受到全球广泛关注。吸附法作为一种安全、经济、易于操作的水处理技术已被普遍应用于锑的去除中[1]。本研究采用高活性{001}晶面二氧化钛(TiO_2)材料对锑(Sb)进行吸附去除。吸附等温线结果表明TiO_2对Sb(III)及Sb(V)的最大吸附容量分别为200 mg/g及156 mg/g。吸附动力学表明Sb的吸附符合拟二级动力学方程,平衡时间为60 min。Zeta电位结果表明TiO_2表面吸附Sb后其等电点(PZC)左移,说明形成了带负电的内层吸附结构。基于密度泛函数理论(DFT)的计算结果显示,Sb(III)在TiO_2表面可以形成单齿和双齿两种吸附构型,其吸附能分别为-2.06和-4.09 e V;而Sb(V)只能以双齿构型吸附在TiO_2{001}表面,其吸附能为-8.28 e V。基于同步辐射的EXAFS分析表明Sb主要以双齿吸附构型存在于TiO_2表面。该研究表明具有高能晶面的TiO_2材料可用于锑的高效吸附去除。
Developing novel adsorbents with high adsorption capacity for antimony(Sb) remains a global challenge for decades.In this study,high-energy {001} facet TiO_2 was used to remove Sb.Adsorption experiments demonstrated that the maximum adsorption capacity for Sb(III) and Sb(V) on TiO_2 was 200 mg/g and 156 mg/g,respectively.The PZC of TiO_2 shifted to lower pH values upon Sb adsorption,indicating the formation of negatively charged inner-sphere surface complexes.DFT calculations show that Sb(III) forms both monodentate(-2.06 e V) and bidentate(-4.09 e V) surface configurations;whereas Sb(V) only forms bidentate complex with an adsorption energy of-8.28 e V.EXAFS analysis indicates that Sb formed bidentate structures on TiO_2.This study demonstrates that TiO_2 with high energy {001} facet is a promising adsorbent for Sb removal.
Developing novel adsorbents with high adsorption capacity for antimony(Sb) remains a global challenge for decades.In this study,high-energy {001} facet TiO_2 was used to remove Sb.Adsorption experiments demonstrated that the maximum adsorption capacity for Sb(III) and Sb(V) on TiO_2 was 200 mg/g and 156 mg/g,respectively.The PZC of TiO_2 shifted to lower pH values upon Sb adsorption,indicating the formation of negatively charged inner-sphere surface complexes.DFT calculations show that Sb(III) forms both monodentate(-2.06 e V) and bidentate(-4.09 e V) surface configurations;whereas Sb(V) only forms bidentate complex with an adsorption energy of-8.28 e V.EXAFS analysis indicates that Sb formed bidentate structures on TiO_2.This study demonstrates that TiO_2 with high energy {001} facet is a promising adsorbent for Sb removal.
引文
[1]Luo,J.M.;Luo,X.B.;Crittenden,J.;Qu,J.H.;Bai,Y.H.;Peng,Y.;Li,J.H.Environ.Sci.Technol.2015,49(18),11115.