Preparation of glucose biochar and sepiolite composites for Cr (VI) removal from water

Abstract

Abstract: The presence of heavy metals in water poses a significant threat to human health, and adsorption has great potential in metallic ions removal. Glucose hydrochar sheathed sepiolite composite (G9S1) was obtained by hydrothermal process at 200 ℃ after mixing a certain concentration of sepiolite and glucose. The adsorption performance and mechanism of G9S1 for hexavalent chromium Cr (VI) were systematically investigated. Scanning electron microscopy (SEM) results indicate that G9S1 has an elongated rod-like shape with a rough surface from sepiolite. At ambient temperature, the Cr(VI) adsorption process conformed to the pseudo-second-order kinetic model and the Langmuir model, with a maximum adsorption capacity of 31.22 mg/g. The combined results from XPS, FT-IR, adsorption kinetics, and isotherms indicate that the main removal mechanism is attributed to synergistic effects from pore adsorption, electrostatic attraction, reduction, and complexation. G9S1 exhibits good recycling performance, retaining 73.3% of its Cr(VI) adsorption capacity after five cycles. This work provides a theoretical basis for metallic ions removal by cost-effective adsorbents. Compared with individual glucose-derived biochar and sepiolite, the amount of G9S1 is highly enhanced.

Key words: glucose, sepiolite, biochar, adsorption, heavy metal ions

CLC Number:

TQ424

LUO Ling-ling, ZHOU Zhi-kang, ZHAO Yin-xu, ZHOU Jie, CAI Jin-jun. Preparation of glucose biochar and sepiolite composites for Cr (VI) removal from water[J]. Journal of Lanzhou University of Technology, 2026, 52(2): 63-69.

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URL: https://journal.lut.edu.cn/EN/

https://journal.lut.edu.cn/EN/Y2026/V52/I2/63

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