Volume 48, Issue 7 e70075
Research Article

Adsorption and Enrichment of Ag(I) from Wastewater Using Wheat Bran-Derived Biosorbent

Wanjia Feng

Wanjia Feng

School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, Shaanxi, 710055 China

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Yunfan Bai

Yunfan Bai

School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, Shaanxi, 710055 China

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Chuhua Qi

Chuhua Qi

School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, Shaanxi, 710055 China

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Pingping Wu

Pingping Wu

School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, Shaanxi, 710055 China

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Zhixian He

Zhixian He

Instrumental Analysis Center, Xi'an University of Architecture and Technology, Zigeshuyuan, Caosi East Road, Caotang Temple Scenic Area, Xi'an, Shaanxi, 710311 China

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Shuangli Chen

Shuangli Chen

School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, Shaanxi, 710055 China

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Sijing Zhang

Corresponding Author

Sijing Zhang

School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, No. 13, Yanta Road, Xi'an, Shaanxi, 710055 China

E-mail: [email protected]

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First published: 08 July 2025

Abstract

2,5-Dimercapto-1,3,4-thiadiazole modified wheat bran (DMTD-WB), a bio-sorbent synthesized by immobilizing DMTD onto WB, demonstrated outstanding selectivity for Ag(I) recovery from multi-metal wastewater. Under optimized conditions (30 °C, pH 3.0, dosage of 6.00 g L−1), an Ag(I) adsorption efficiency of 98.15 % was achieved. Fixed-bed adsorption experiments further confirmed its selectivity, whereas regeneration tests indicated a recovery efficiency of 81.43 % for Ag(I) after five cycles. Thermodynamic analysis revealed a maximum adsorption capacity of 60.39 mg g−1 at 40 °C. Kinetic and mass transfer studies identified chemisorption via coordination as the dominant adsorption mechanism, with the homogeneous solid diffusion (HSD) model providing a satisfactory fit for the adsorption kinetics. Overall, this study highlights DMTD-WB as a sustainable and efficient adsorbent for Ag(I) recovery, offering a value-added approach to agricultural waste utilization in wastewater treatment.

The authors have declared no conflict of interest.

Data Availability Statement

The author confirms that data supporting the result of this study are available in the article.

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