Preparation of quaternary ammonium-modified tea stem-based hydrothermally activated carbon and study on its Cr(VI) adsorption mechanism

XU Xiaoxiao; CHEN Jiayao; ZHU Linyu; QIU Xueqing; HUANG Jinhao; ZHENG Dafeng

doi:10.11949/0438-1157.20260307

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Preparation of quaternary ammonium-modified tea stem-based hydrothermally activated carbon and study on its Cr(VI) adsorption mechanism

更新时间：2026-08-12

- Preparation of quaternary ammonium-modified tea stem-based hydrothermally activated carbon and study on its Cr(VI) adsorption mechanism
- CIESC Journal (2026)
- 作者机构：
  
  1.华南理工大学化学与化工学院，广东广州 510006
  2.广东工业大学轻工化工学院，广东广州 510006
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260307
  CLC： X 703.5;TQ 424.1
- Received：11 March 2026，
  
  Revised：2026-08-10，
  
  Accepted：12 August 2026，
- 稿件说明：
移动端阅览
XU Xiaoxiao, CHEN Jiayao, ZHU Linyu, et al. Preparation of quaternary ammonium-modified tea stem-based hydrothermally activated carbon and study on its Cr(VI) adsorption mechanism[J/OL]. CIESC Journal, 2026.
DOI：

XU Xiaoxiao, CHEN Jiayao, ZHU Linyu, et al. Preparation of quaternary ammonium-modified tea stem-based hydrothermally activated carbon and study on its Cr(VI) adsorption mechanism[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260307.

摘要

水体中的Cr(VI)污染对环境和人类健康构成了日益严重的威胁。本文以茶梗废弃物为原料，通过一步水热炭化法合成了一种新型季铵化水热

炭。成功引入的季铵基团（N⁺(CH₃)₃）显著增强了材料表面的正电荷，从而提高了其对Cr(VI)阴离子的亲和力。通过吸附实验和一系列表征，系统研究了其吸附性能及潜在机理。优化后的材料TSH4N15-220在酸性条件下表现出优异的吸附容量，最高可达464.96 mg·g

-1

。吸附过程遵循准二级动力学模型，并与Freundlich等温模型拟合最佳，表明多层化学吸附是其主要作用机制。Cr(VI)的去除涉及静电吸引、还原、络合和孔隙填充效应。此外，经过五次吸附-解吸循环后，TSH4N15-220对Cr(VI)的去除率仍保持在46.36%以上。总体而言，本研究为废水中Cr(VI)的去除提供了一种绿色、简便且高效的策略，并展示了农业生物质在环境修复应用中的潜力。

Abstract

Hexavalent chromium (Cr(VI)) contamination in water bodies poses a growing threat to environmental and human health. In this study

a novel quaternized hydrothermal carbon was synthesized from tea stem waste via a one-step hydrothermal carbonization method. Quaternary ammonium groups (N⁺(CH₃)₃) were successfully introduced

significantly enhancing the surface positive charge and thus improving the material’s affinity for Cr(VI) anions. The adsorption performance and underlying mechanism were systematically investigated through batch experiments and comprehensive characterization. The optimized material

TSH4N15-220

exhibited excellent adsorption capacity

reaching a maximum of 464.96 mg·g⁻¹ under acidic conditions. The adsorption process followed a pseudo-second-order kinetic model and was best described by the Freundlich isotherm

indicating multilayer chemisorption as the dominant mechanism. The Cr(VI) removal involved electrostatic attraction

reduction

complexation

and pore-filling effects. Moreover

TSH4N15-220 retained a Cr(VI) removal efficiency above 46.36% after five adsorption–desorption cycles. Overall

this work presents a green

simple

and efficient strategy for Cr(VI) removal from wastewater and demonstrates the potential of agricultural biomass for environmental remediation applications.

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references

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