Adsorptive characteristics and mechanisms of cadmium in water onto magnesium- and ultrasound-modified rice straw biochars

IF 3.4 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of the Indian Chemical Society Pub Date : 2025-09-13 DOI:10.1016/j.jics.2025.102114

Jun Li , Dexin Shan , Zongyu Gao , Xinyue Zhang , Yufu Xie , Meiying Huang , Taiping Xie

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Abstract

Immediate resolution of Cd²⁺ pollution presents a pressing necessity. In this study, physical (ultrasonic) and chemical (magnesium loading) modification techniques were used to prepare modified rice straw biochar for effective adsorption of Cd²⁺ from wastewater. XRD, FTIR, XPS, SEM, and N₂ adsorption were used to analyze the modified biochar and assess its adsorption capacity. The results showed that the adsorption capacity of ultrasonic magnesium-modified biochar (UMBC) reached 180.49 mg/g according to Langmuir isothermal modeling, which was 3.8 times higher than the adsorption capacity of the original biochar (BC) of 47.64 mg/g, 3 times higher than that of the ultrasonic-modified biochar (UBC) of 61.14 mg/g, and 1.3 times higher than that of the magnesium-modified biochar (MBC) of 138.51 mg/g. Ion exchange and precipitation were the primary adsorption mechanisms of UMBC. The results of the suggested secondary adsorption kinetics demonstrate that chemisorption may be the predominant mechanism for Cd²⁺ adsorption by UMBC. This study opens new avenues for utilizing this biochar in practical applications.

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镁改性和超声改性稻秆生物炭对水中镉的吸附特性及机理

立即解决Cd2+污染是迫切需要的。本研究采用物理（超声波）和化学（镁负载）改性技术制备改性稻秆生物炭，以有效吸附废水中的Cd2+。采用XRD、FTIR、XPS、SEM和N2吸附等方法对改性后的生物炭进行了分析，并对其吸附性能进行了评价。结果表明，超声镁改性生物炭（UMBC）吸附量达到180.49 mg/g，是原生物炭（BC）吸附量47.64 mg/g的3.8倍，是超声改性生物炭（UBC）吸附量61.14 mg/g的3倍，是镁改性生物炭（MBC）吸附量138.51 mg/g的1.3倍。离子交换和沉淀是UMBC的主要吸附机制。二级吸附动力学结果表明，化学吸附可能是UMBC吸附Cd2+的主要机制。本研究为生物炭的实际应用开辟了新的途径。

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来源期刊

Journal of the Indian Chemical Society 化学-化学综合

CiteScore

3.50

自引率

7.70%

发文量

492

审稿时长

3-8 weeks

期刊介绍： The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.