Performance and economy of antibiotic adsorption by the composite of plant decomposed liquid, chemical modifier, and clay

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2024-11-07 DOI:10.1016/j.psep.2024.11.025

Hongyan Deng , Yuting Song , Wenbin Li , Mah Noor Fatima , Hamida Bibi , Siyu Ye

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引用次数: 0

Abstract

Antibiotics is one of the four types of new pollutants which are widely concerned in the world. To investigate the performance and economy of antibiotic adsorption by a composite made of clay, plant decomposed liquid (DL), and chemical modifier, bentonite (B) and kaolin (K) were modified by the DL of Alternanthera philoxeroides to prepare biological clays. Then, dodecyl dimethyl betaine (BS), polyacrylamide (PAM), and ethylenediaminetetraacetic acid (EA) were compositely modified on the biological clay to prepare different chemical–biological clays. The thermodynamic and kinetic characteristics of oxytetracycline (OTC) and chlortetracycline (CTC) adsorption were investigated by batch treatment. The adsorption changes in antibiotics on the modified clays under various pH levels, ionic strengths, and temperatures were compared, and the economy of antibiotic adsorption by different modified clays was analyzed. The maximal adsorption capacity (q_m) values for OTC and CTC were 82.48–301.08 and 63.00–258.26 mmol/kg, respectively, ranking in the order of PAM- > BS- > EA-modified biological clays. The q_m values of antibiotics by different modified Bs were higher than those by different modified Ks. In the pH range of 3–7 and temperature range of 10 °C–30 °C, high temperature and pH were conducive to antibiotic adsorption, which was determined as a spontaneous, endothermic, and entropy-increasing process. The amount of antibiotic adsorption initially increased and then decreased with the increase in ionic strength, with the maximum adsorption observed at 0.1 mol/L ionic strength. The adsorption of antibiotics by different modified clays conformed to the pseudo-first-order kinetic equation. The economy (q_m/price) of different _modified clays for antibiotic adsorption ranged between 29.55 and 169.66 mg/¥, and the PAM-modified biological clays showed the highest economy. The modified Bs had higher economy in antibiotic adsorption than the modified Ks.

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植物分解液、化学改性剂和粘土复合材料吸附抗生素的性能和经济性

抗生素是全球广泛关注的四类新型污染物之一。为了研究由粘土、植物分解液（DL）和化学改性剂组成的复合材料对抗生素的吸附性能和经济性，研究人员用Alternanthera philoxeroides的DL对膨润土（B）和高岭土（K）进行改性，制备出生物粘土。然后在生物粘土上复合改性十二烷基二甲基甜菜碱（BS）、聚丙烯酰胺（PAM）和乙二胺四乙酸（EA），制备出不同的化学生物粘土。通过批处理研究了土霉素（OTC）和金霉素（CTC）吸附的热力学和动力学特征。比较了不同 pH 值、离子强度和温度下抗生素在改性粘土上的吸附变化，分析了不同改性粘土吸附抗生素的经济性。OTC和CTC的最大吸附容量（qm）值分别为82.48-301.08和63.00-258.26 mmol/kg，依次为PAM- >；BS- >；EA改性生物粘土。不同改性 Bs 的抗生素 qm 值均高于不同改性 Ks。在 pH 值为 3-7 和温度为 10 ℃-30 ℃的条件下，高温和 pH 值有利于抗生素的吸附，吸附过程为自发、内热和熵增过程。随着离子强度的增加，抗生素的吸附量先增加后减少，在离子强度为 0.1 mol/L 时吸附量最大。不同改性粘土对抗生素的吸附符合伪一阶动力学方程。不同改性粘土吸附抗生素的经济性（qm/价格）介于 29.55 至 169.66 mg/¥ 之间，其中 PAM 改性生物粘土的经济性最高。改性 Bs 的抗生素吸附经济性高于改性 Ks。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

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