Adsorption of tetracycline in water by humic acid modified biochar derived from walnut green husk

YU Jie; ZHU Xiaoli; ZHANG Xing; ZHANG Ziye; KE Yuxin; ZHANG Chanjuan

doi:10.16152/j.cnki.xdxbzr.2026-01-004

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Adsorption of tetracycline in water by humic acid modified biochar derived from walnut green husk

更新时间：2026-02-24

- Adsorption of tetracycline in water by humic acid modified biochar derived from walnut green husk
- Journal of Northwest University (Natural Science Edition) Vol. 56, Issue 1, Pages: 35-46(2026)
- 作者机构：
  
  1.西北大学　城市与环境学院，陕西　西安　710127
  2.西安金博瑞生态科技有限公司，陕西　西安　710065
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2026-01-004
  CLC： X53
- Received：26 September 2025，
  
  Revised：2025-10-30，
  
  Published：25 February 2026
- 稿件说明：
移动端阅览
YU Jie, ZHU Xiaoli, ZHANG Xing, et al. Adsorption of tetracycline in water by humic acid modified biochar derived from walnut green husk[J]. Journal of Northwest University (Natural Science Edition), 2026, 56(1): 35-46.
DOI：

YU Jie, ZHU Xiaoli, ZHANG Xing, et al. Adsorption of tetracycline in water by humic acid modified biochar derived from walnut green husk[J]. Journal of Northwest University (Natural Science Edition), 2026, 56(1): 35-46. DOI： 10.16152/j.cnki.xdxbzr.2026-01-004.

摘要

针对废水中四环素类（tetracycline，TC）有机污染物，开发高性能吸附剂材料仍是环境研究的热点问题之一。核桃青皮作为一种农业废弃物，常被随意堆放在野外，既对周边生态环境产生影响，也忽视了其潜在的应用价值。基于此，以不同热解温度制备的核桃青皮生物炭（HF）为原料，通过负载腐植酸得到了3种生物炭-腐植酸复合材料HA-HF300、HA-HF500和HA-HF700，探究其对TC的吸附效应。试验结果显示，HA-HF700对TC表现出最佳的吸附性能，表征分析结果证实HA-HF700综合了2种材料的特性，具备更丰富的表面官能团和更强的芳香性，从而提高了复合材料的吸附性能。此外，HA-HF700在pH=3、材料投加量为1 g·L

-1

时，对TC表现出最强的吸附性能，实测吸附量达到76.20 mg·g

-1

。然而，当溶液中存在Mg

、Ca

、Na

和K

时，则会对HA-HF700吸附TC产生抑制作用。准二级动力学和Langmuir等温吸附模型更准确地描述了HA-HF700对TC的吸附过程。结合材料表征结果，认为HA-HF700对TC的吸附作用主要包括静电作用、氢键作用、π-π EDA相互作用和疏水作用。研究结论为废水中四环素类污染物的无害化处理提供了理论支撑。

Abstract

Developing adsorbent materials with higher performance for tetracycline (TC) organic pollutants in wastewater is still accounted for a hot topic i

n environmental remediation. As an agricultural waste

walnut green husk is often piled up in the field at will

which not only seriously affects the surrounding ecological environment

but also overlooks its potential value for practical application. Therefore

three types composite adsorbents of HA-HF300

HA-HF500 and HA-HF700 were fabricated by loading humic acid onto walnut green husk biochar (HF) prepared under different pyrolysis temperature

so as to investigate their performance for TC adsorption. The experiment results showed that HA-HF700 exhibited the highest adsorption performance for TC. The characterization results confirmed that HA-HF700 combined the advantages of both materials

and more surface functional groups and aromaticity were observed

which improved the adsorption performance of fabricated materials. In addition

HA-HF700 obtained the strongest performance for TC at solution pH of 3 with dosage of 1 g·L

-1

as the tested adsorption capacity reaching 76.20 mg·g

-1

. Nonetheless

the adsorption process of HA-HF700 for TC would be inhibited when co-existing with Mg

and K

. The Pseudo-second-kinetic and Langmuir isotherm model descripted the adsorption process of HA-HF700 for TC more accurately. By integrating the results of characterization

it is believed that the adsorption mechanisms of HA-HF700 for TC mainly include electrostatic interaction

hydrogen bonding

π-π EDA interaction

and hydrophobic interaction. To conclude

this study offered a new adsorbent for tetracycline contaminated wastewater treatment.

关键词

Keywords

references

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