| 不同金属改性的蒙脱土对普萘洛尔的吸附 |
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| 引用本文： | 荆秀艳,王文姬,董强飞,乔乐乐,邓月华.不同金属改性的蒙脱土对普萘洛尔的吸附[J].环境工程,2022,40(5):67-74. |
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| 作者姓名： | 荆秀艳 王文姬 董强飞 乔乐乐 邓月华 |
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| 作者单位： | 西安科技大学 地质与环境学院, 西安 710054 |
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| 基金项目： | 陕西省自然科学基金(2020JQ-740)； |
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| 摘 要： | 采用浸渍法将蒙脱土用5种金属阳离子饱和,分别得到铁基蒙脱土、铜基蒙脱土、钾基蒙脱土、钠基蒙脱土和钙基蒙脱土,研究普萘洛尔在这5种金属阳离子饱和的蒙脱土上的吸附行为,探明主要影响因素,并推测可能的吸附机制。结果表明:5种金属阳离子饱和的蒙脱土对普萘洛尔均具有较高的吸附能力,且吸附能力顺序为铁基蒙脱土>铜基蒙脱土>钾基蒙脱土>钠基蒙脱土>钙基蒙脱土。pH为3~9时吸附量增加,是由于溶液中H+与普萘洛尔在金属阳离子饱和蒙脱土上吸附位点竞争力减弱;pH为9~11时吸附量减少,是由于普萘洛尔主要以分子状态存在,静电引力下降。K+、Na+和Ca2+的存在会抑制普萘洛尔的吸附。腐植酸加入会促进普萘洛尔的吸附,但促进作用随腐植酸浓度升高而减弱,甚至出现抑制作用。Langmuir等温吸附模型和准二级动力学方程能较好地描述普萘洛尔的吸附过程。研究结果有望为全面掌握普萘洛尔在土壤环境中的迁移转化规律提供的理论依据。
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| 关 键 词： | 普萘洛尔 金属阳离子饱和 蒙脱土 吸附 |
| 收稿时间： | 2021-09-02 |
ADSORPTION OF PROPRANOLOL ON MONTMORILLONITE SATURATED WITH DIFFERENT METAL CATIONS |
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| Affiliation: | College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China |
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| Abstract: | In this paper, the montmorillonite was saturated with five metal cations by the impregnation method to obtain iron-based montmorillonite(Fe-MT), copper-based montmorillonite(Cu-MT), potassium-based montmorillonite(K-MT), sodium-based montmorillonite(Na-MT), and calcium-based montmorillonite(Ca-MT). The adsorption behavior, main influencing factors, and adsorption mechanism of propranolol on these montmorillonites saturated with five interlayer metal cations were studied. The results showed that the five metal cations saturated montmorillonite had high adsorption capacity for propranolol, in the sequence of Fe-MT>Cu-MT>K-MT>Na-MT>Ca-MT. The increase of adsorption capacity at pH of 3~9 was due to the weakening of the competitiveness of adsorption sites of H+ and propranolol on montmorillonite saturated with metal cations. The decrease of adsorption capacity at pH of 9~11 resulted from propranolol mainly existed in molecular state and the decrease of electrostatic attraction. The presence of K+, Na+, and Ca2+ could inhibit the absorption of propranolol. The addition of humic acid could promote the adsorption of propranolol, but its effect decreased with the increase of humic acid concentration, and even adsorption inhibition occured. Langmuir isothermal adsorption model and the pseudo-second-order kinetic equation could better describe the adsorption process of propranolol. This study was expected to provide a theoretical basis for a comprehensive understanding of the migration and transformation of propranolol in soil environment. |
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