期刊论文

Thermal activation of mesoporous calcareous tufa for the removal of Cd(Ⅱ) from an aqueous solution

中文

环境污染与防治

1001-3865

2020

42

6

723-728

10.15985/j.cnki.1001-3865.2020.06.013

No.41977129:国家自然科学基金 No.21607176:国家自然科学基金 No.2020JJ4136:湖南省自然科学基金 No.2017JJ3516:湖南省自然科学基金 No.16B274:湖南省教育厅优秀青年项目 :国家自然科学基金

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采用热活化技术改性上水石,探讨热活化前后上水石的特征变化和吸附能力,同时考察了热活化后上水石对Cd(Ⅱ)的吸附动力学、吸附热力学及吸附机理。结果表明:(1)热活化后上水石表面形成塌陷和界面缺陷,能提供更多的吸附活性位点来有效提高其吸附能力。(2)上水石经750 ℃热活化后,吸附量显著提高。其中,750 ℃热活化后的山东省、山西省上水石的最大吸附量分别为37.20、24.65 mg/g。上水石对Cd(Ⅱ)的吸附更符合准二级动力学模型,表明吸附速率由化学吸附控制。Langmuir模型能更好拟合上水石对Cd(Ⅱ)的吸附,反映了该吸附过程是单层吸附。(3)热活化后上水石对Cd(Ⅱ)的吸附机理可归因于形成了CdCO_3、Cd...

The thermal activation technology was used to modify the calcareous tufa (CT),and the adsorption capacity of the CT was discussed,and also the adsorption kinetics,adsorption thermodynamics and adsorption mechanism of the CT after thermal activation were investigated. The result showed that: (1) the surface of the CT after thermal activation formed interface collapse and rugged surface,which could provide more adsorption active sites to effectively improve its adsorption capacity. (2) The adsorption capacity of CT after 750 ℃ thermal activation...