Preparation of biochar from co-pyrolysis of Napier grass and food waste digestate for Pb<sup>2+</sup> removal from wastewater

YANG Gaixiu; MEI Wenjie; AI Hongdou; CHEN Jiamin; CHAI Jianfei; SONG Liang; WU Bin; ZHENG Zhiyong; LIU Runyu

doi:10.13205/j.hjgc.202607016

Volume 44 Issue 7

Jul. 2026

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2026 > 44(7): 156-166

YANG Gaixiu, MEI Wenjie, AI Hongdou, CHEN Jiamin, CHAI Jianfei, SONG Liang, WU Bin, ZHENG Zhiyong, LIU Runyu. Preparation of biochar from co-pyrolysis of Napier grass and food waste digestate for Pb2+ removal from wastewater[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(7): 156-166. doi: 10.13205/j.hjgc.202607016

Citation:

YANG Gaixiu, MEI Wenjie, AI Hongdou, CHEN Jiamin, CHAI Jianfei, SONG Liang, WU Bin, ZHENG Zhiyong, LIU Runyu. Preparation of biochar from co-pyrolysis of Napier grass and food waste digestate for Pb²⁺ removal from wastewater[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(7): 156-166. doi: 10.13205/j.hjgc.202607016

Citation:

YANG Gaixiu, MEI Wenjie, AI Hongdou, CHEN Jiamin, CHAI Jianfei, SONG Liang, WU Bin, ZHENG Zhiyong, LIU Runyu. Preparation of biochar from co-pyrolysis of Napier grass and food waste digestate for Pb²⁺ removal from wastewater[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(7): 156-166. doi: 10.13205/j.hjgc.202607016

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Preparation of biochar from co-pyrolysis of Napier grass and food waste digestate for Pb²⁺ removal from wastewater

doi: 10.13205/j.hjgc.202607016

1. College of Ecology and Environment, Xizang University, Lhasa 850000, China;
2. CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
3. Fujian University of Technology, Fuzhou 350118, China;
4. Fuzhou University, Fuzhou 350108, China;
5. China Nuclear Industry Huaxing Construction Co., Ltd., Zhangzhou 363500, China;
6. Fujian Longcheng Build Group Co., Ltd., Zhangzhou 363199, China

Received Date: 2026-03-30
Available Online: 2026-09-01

Abstract

Abstract

Lead （Pb） is a toxic heavy metal that poses a severe threat to the environment and human health， particularly to children. It can accumulate in the human body and cause damage to multiple organs and systems. Therefore， developing low-cost and highly efficient adsorbent materials for lead removal is of great significance. In this study， biochars were prepared by pyrolysis of Napier grass， food waste digestate， and their mixtures， and their adsorption performance and mechanisms for Pb²⁺ in water were investigated. Adsorption kinetics and isotherms were simulated and fitted， combined with characterization techniques such as FTIR and SEM-EDS for in-depth analysis. The results showed that the adsorption performance for Pb²⁺ varied significantly with different biochar mixing ratios， with the mass ratio of Napier grass and food waste digestate at 3∶1 exhibiting the optimal effect， followed by pure energy cane. Furthermore， at pH 6， the adsorption capacity increased rapidly within 0 to 180 min and reached equilibrium at 360 min. As the initial Pb²⁺ concentration increased， the adsorption capacity increased accordingly and leveled off when the initial concentration exceeded 400 mg/L. In conclusion， the mixed biochar is characterized by simple preparation， low cost， and high adsorption capacity， providing data support and a theoretical basis for heavy metal pollution remediation.
- Napier grass,
- food waste digestate,
- biochar,
- adsorption,
- heavy metal removal

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References(23)

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