Efficient adsorption of highly-concentrated Cr(VI) from aqueous solutions using tea residue-derived humic acid
The efficient capture and removal of toxic metals, for instance, Chromium (Cr(VI)) from aqueous environments is a critical issue, in environmental science and engineering. Developing cost-effective, eco-friendly and pH-adaptive adsorbent is essential for addressing this challenge. In this study, tea...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | Desalination and Water Treatment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398625002437 |
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| Summary: | The efficient capture and removal of toxic metals, for instance, Chromium (Cr(VI)) from aqueous environments is a critical issue, in environmental science and engineering. Developing cost-effective, eco-friendly and pH-adaptive adsorbent is essential for addressing this challenge. In this study, tea residue-based humic acid (T-HA) adsorbent was feasibly prepared via an alkali-soluble acid precipitation method for the optimal elimination of Cr(VI) from aqueous solutions. Results indicate that T-HA can be extracted from tea residues while the study of tea residue as an emerging biomass feedstock remains in the exploratory stage, yielding 1.47 % through the proposed method. The highest adsorption capacity of T-HA for Cr(VI) was recorded as 27.32 mg/g, significantly 53.92 % higher than that of untreated tea residue. The adsorption behavior adhered to pseudo-second-order kinetics (R2=0.999) and was consistent with the Freundlich isotherm model (R2=0.987), suggesting that chemical adsorption was the dominant mechanism. This study highlights the potential of T-HA for the valorization of tea residues and the purification of heavy metal-contaminated wastewater, contributing to sustainable resource utilization and environmental remediation. |
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| ISSN: | 1944-3986 |