Preparation of lignin-based biochar from poplar and straw and its adsorption properties on Pb<sup>2+</sup>

NI Bingying; PEI Xiaoyu; XIE Jun; FAN Meishan

doi:10.13205/j.hjgc.202511014

Volume 43 Issue 11

Nov. 2025

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NI Bingying, PEI Xiaoyu, XIE Jun, FAN Meishan. Preparation of lignin-based biochar from poplar and straw and its adsorption properties on Pb2+[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 123-132. doi: 10.13205/j.hjgc.202511014

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NI Bingying, PEI Xiaoyu, XIE Jun, FAN Meishan. Preparation of lignin-based biochar from poplar and straw and its adsorption properties on Pb²⁺[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 123-132. doi: 10.13205/j.hjgc.202511014

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Preparation of lignin-based biochar from poplar and straw and its adsorption properties on Pb²⁺

doi: 10.13205/j.hjgc.202511014

1. Institute of Biomass Engineering, South China Agricultural University, Guangzhou 510642, China;
2. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China

Received Date: 2025-03-24
Accepted Date: 2025-05-15
Rev Recd Date: 2025-04-29

Available Online: 2026-01-09

Abstract

Abstract

Lignin-based biochar is renowned for its multifunctionality and environmental benefits. However， there is limited information on the intricate relationship between structural characteristics and the adsorption capacities of lignin-based biochar derived from different biomass sources. This study comparatively analyzed the Pb²⁺ adsorption performance of lignin-based biochar prepared from NaOH/ethanol-pretreated hardwoods （poplar woodchips） and herbaceous plants （wheat straw） at varying pyrolysis temperatures （350， 550， 750 ℃） and chemical modifications （KOH and chitosan）. Notably， chitosan-modified wheat straw lignin-based biochar demonstrated superior Pb²⁺ adsorption performance， achieving an adsorption capacity of 37.78 mg/g. Its unique structural properties， including active functional groups ［—OH， —C（O）NH—， etc.］ on the surface， contributed to this excellent adsorption capacity. The adsorption mechanism conformed to the quasi-second-order kinetics， indicating chemisorption was the dominant mechanism， while intraparticle diffusion occurred in two stages. Additionally， isothermal adsorption data were best described by the Freundlich model， suggesting that both chemical complexation and surface heterogeneity govern the adsorption process. These findings offer valuable insights into how the origin of lignin impacts the adsorption efficacy of its derived biochar.
- pretreatment waste liquid,
- biochar,
- modification,
- chitosan,
- KOH,
- Pb²⁺

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References(36)

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