改性生物炭对高浓度锑废水中Sb(Ⅴ)的去除效果
Removal of Sb(Ⅴ) from antimony-rich wastewater by modified biochar
查看参考文献44篇
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文摘
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锑(Sb)污染是我国的典型环境问题之一,高浓度的Sb废水是Sb矿区一个重要的Sb污染来源,治理 Sb矿废水的重点是高效去除水中的Sb(Ⅴ)。因此本研究采用经典吸附实验方法,用改性生物炭去除水溶液中的 Sb(Ⅴ),旨在评价该改性生物炭在含Sb废水中的应用效果和潜力;结果显示,生物炭经过改性处理后吸附 Sb(Ⅴ)能力显著增大,热解温度为600 ℃得到的改性生物炭(MC600),在投加比为2.5 g·L~(-1)、pH=7.5条件下,对 Sb(Ⅴ)的吸附能力最强,Langmuir模型拟合的最大饱和吸附量为8 089 mg·kg~(-1)。吸附动力学实验发现Elovich方程对MC600吸附Sb(Ⅴ)的拟合效果最好(R~2=0.993),吸附过程主要为非均匀表面吸附;吸附等温实验中 MC600对Sb(Ⅴ)的吸附行为适用于Langmuir和Langmuir-Freundlich模型拟合(R~2=0.981、0.980),表明MC600对 Sb(Ⅴ)的吸附主要以单分子层吸附为主,并伴有部分多分子层吸附。通过对MC600吸附高浓度Sb(Ⅴ)后的样品进行解吸,2种样品3次总解吸率均低于30%,表明MC600吸附Sb(Ⅴ)的效果稳定。以上结果表明,改性的 MC600对高浓度Sb废水中Sb(Ⅴ)的去除具有潜在的应用前景。 |
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其他语种文摘
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Antimony (Sb) pollution is one of the typical environmental issues in China.High concentration of Sb in wastewater is an important source of Sb pollution in Sb mining area.The key point of treating Sb mine wastewater lies in high efficient removal of Sb(Ⅴ) in wastewater.To evaluate the removal efficiency and capacity of Sb(Ⅴ) from Sb-containing wastewater by modified biochar,batch experiments were conducted in this study.The results showed that Sb(Ⅴ) adsorption performance increased for the biochar after modification.The adsorption kinetics experiment indicated that the Sb(Ⅴ) adsorption by MC600 conforms to the Elovich model (R~2=0.993),and the adsorption process was mainly non-uniform surface adsorption.In the adsorption isotherm experiment,the Sb(Ⅴ) adsorption behavior of MC600 was suitable for Langmuir and Langmuir-Freundlich models with respective R2 value of 0.981 and 0.980,which showed that the Sb(Ⅴ) adsorption on MC600 was mainly single molecular layer adsorption with partial multi-molecular layer one.The modified biochar (MC600) pyrolyzed at 600 ℃ presented the maximum adsorption amount for Sb(Ⅴ) at the dosage of 2.5 g·L~(-1) and pH=7.5.The maximum adsorption capacity determined by the Langmuir model was 8 089 mg·kg~(-1).According to the desorption experiment,the total desorption ratios of Sb(Ⅴ) from two MC600 samples were less than 30%,which showed that Sb(Ⅴ) adsorption on MC600 was stable.This study provided an alternative way for Sb(Ⅴ) removal from Sb-rich wastewater. |
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来源
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环境工程学报
,2021,15(2):435-445 【核心库】
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DOI
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10.12030/j.cjee.202005006
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关键词
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锑污染
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含锑废水
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改性生物炭
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吸附
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解吸
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地址
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1.
贵州大学资源与环境工程学院, 贵阳, 550025
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贵州大学, 喀斯特地质资源与环境教育部重点实验室, 贵阳, 550025
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1673-9108 |
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学科
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行业污染、废物处理与综合利用 |
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基金
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贵州省项目
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国家自然科学基金委员会-贵州省人民政府喀斯特科学中心项目
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贵州省项目
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国家重点研发计划项目
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文献收藏号
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CSCD:6913060
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