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张莹雪,胥思勤,李佳霜.Sb(Ⅲ)和Sb(Ⅴ)在不同吸附剂上的吸附特征[J].土壤,2018,50(1):139-147. ZHANG Yingxue,XU Siqin,LI Jiashuang.Adsorption Characteristics of Trivalent and Pentavalent Antimony on Different Adsorbents[J].Soils,2018,50(1):139-147 本文二维码信息
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Sb(Ⅲ)和Sb(Ⅴ)在不同吸附剂上的吸附特征
Adsorption Characteristics of Trivalent and Pentavalent Antimony on Different Adsorbents
投稿时间:2016-12-27  修订日期:2017-03-03
DOI:10.13758/j.cnki.tr.2018.01.019
中文关键词:  Sb(Ⅲ)  Sb(Ⅴ)  吸附  土壤矿物  铁/铝氢氧化物
Key Words:Sb(III)  Sb(V)  Adsorption effect  Soil mineral  Iron/aluminum hydroxide
基金项目:国家自然科学基金项目(41062007)、贵州省重点学科建设项目(黔学位合字ZDXK[2016]11号)、贵州省高校喀斯特环境生态工程研究中心建设项目(黔教合KY字[2016]011)和贵州省水利科技经费项目(KT201403)资助。
作者单位E-mail
张莹雪 贵州大学喀斯特环境与地质灾害防治重点实验室 nazhangive@126.com 
胥思勤 贵州大学喀斯特环境与地质灾害防治重点实验室 sqxu1@gzu.edu.cn 
李佳霜 贵州大学喀斯特环境与地质灾害防治重点实验室  
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中文摘要:
      以氢氧化铁、氢氧化铝、高岭土和蛭石4种材料为吸附剂,探究Sb(Ⅲ)和Sb(Ⅴ) 的吸附效果,以类比土壤中主要矿物对Sb的吸附作用并进行对比。研究内容包括吸附动力学试验、等温吸附试验及不同背景溶液pH变化下的吸附解吸效应。结果表明:4种吸附剂对Sb(Ⅲ) 和Sb(Ⅴ) 的吸附在振荡24 h后逐渐趋于平稳,蛭石和氢氧化铁对Sb(Ⅲ)的吸附量在 6 h达到峰值后出现下降,如氢氧化铁在6 h时对Sb(Ⅲ) 的吸附量为23.19 μg/g,72 h后降为19.75 μg/g,并测定出该悬浮液中Sb(Ⅴ) 浓度上升。用Langmuir和Freundlich吸附模型对两种价态Sb的等温吸附曲线进行拟合,两种模型拟合优度均在0.7以上。蛭石和氢氧化铁对Sb(Ⅲ) 的吸附效果好于另两种吸附剂,而蛭石对Sb(Ⅴ) 的吸附能力较弱;氢氧化铁和氢氧化铝对Sb(Ⅴ) 的吸附效果较好,而氢氧化铝对Sb(Ⅲ) 吸附效果不理想。随着pH的增加,Sb(Ⅲ) 和Sb(Ⅴ) 的吸附出现明显下降,并且解吸率增加,表现出pH对吸附的显著影响,如高岭土对Sb(Ⅲ) 的吸附量由平衡液pH为4.82时的10.12 μg/g增加到pH为2.12时的37.89 μg/g。
Abstract:
      This study reports on the adsorption reactions of trivalent antimony (Sb(Ⅲ)) and pentavalent antimony (Sb(Ⅴ)) on four adsorbents: ferric hydroxide, aluminum hydroxide, kaolin and vermiculite, which were used to simulate the main minerals in the soil. The results showed that the adsorptions of both Sb(Ⅲ) and Sb(Ⅴ) on the four adsorbents gradually become stable after 24 h. In addition, the adsorption of Sb(III) on vermiculite and ferric hydroxide reached to peak value at 6 h and then decreased. For example, the adsorption of Sb(Ⅲ) on ferric hydroxide was 23.19 μg/g at 6 h, and decreased to 19.75 μg/g at 72 h. The decline of adsorption and the increase concentration of Sb(Ⅴ) determined in supernatant indicated the oxidation of Sb(Ⅲ) during the adsorption process. The isothermal adsorption curves of two valence antimony were fitted well by Langmuir and Freundlich adsorption models, and the goodness of fit (R2) of both models were above 0.7. Comparing the fitting curve and the parameters obtained, the best adsorption of Sb(III) were shown on vermiculite and ferric hydroxide, while the absorbability of vermiculite to Sb(Ⅴ) was weak. Sb(V) were adsorbed better by ferric hydroxide and aluminum hydroxide, but aluminum hydroxide showed poor adsorption effect of Sb(III). Both valence antimony had anion adsorption characteristics, for the adsorption decreased while the desorption increased with the increase of equilibrium solution pH. For instance, the adsorption of Sb(Ⅲ) on kaolin increased from 10.12 μg/g to 37.89 μg/g when the equilibrium solution pH decreased from 4.82 to 2.12.
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