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Hemp Biochar Removes Lead Fast Using KOH and Ultrasound

By June 3, 2025No Comments

PubMed is a free, comprehensive database of scientific and medical literature, primarily focusing on biomedical and life sciences research. It is maintained by the National Library of Medicine (NLM) at the National Institutes of Health (NIH). PubMed is one of the most widely used resources for healthcare professionals, researchers, and students to access peer-reviewed articles, clinical studies, and other scientific publications.

. 2025 May 18;18(10):2348.

doi: 10.3390/ma18102348.

Ultrasonic-Assisted K+ Modification of Industrial Hemp Stalk Hydrothermal Biochar for Highly Effective Adsorption of Pb2

Le Liu 1, Wanjin Yu 2, Zheren Zhang 3 4, Qiyao Li 4, Chun Peng 4, Kaisheng Wu 1, Duoduo Liu 1, Sufang He 3 4, Nengsheng Liu 1, Xiang Li 3
Affiliations 

Abstract

Biochar modification represents an effective approach for enhancing adsorption capacity. In the research, industrial hemp straw-derived biochar was synthesized through hydrothermal carbonization coupled with ultrasound-assisted KOH activation, demonstrating exceptional Pb2+ adsorption efficiency. The optimal HBS50-K0.5M exhibited excellent adsorption performance, achieving the maximum adsorption capacity of 345.8 mg/g within 2 h. The etching effect of KOH on the biochar surface increased the O-containing functional groups, which enhanced the adsorption of Pb2+. The adsorption kinetics revealed that the adsorption process of Pb2+ was aligned with the pseudo-second-order kinetics as well as the Langmuir model. The complexation, ion exchange, π-π interaction, as well as electrostatic interaction participated in the adsorption. This study demonstrates that ultrasound-assisted KOH-activated biochar has great potential for removing Pb2+ from wastewater.

Keywords: efficient adsorption, heavy metal, industrial hemp stalk hydrothermal biochar, ultrasonic-assisted KOH activation

Hemp biochar isn’t just black powder; it’s a green technology waiting to transform pollution into progress. This ultrasonic-KOH hack shows how even industrial leftovers can become tools of planetary healing. Lead doesn’t stand a chance.

Ultrasound and KOH-modified hemp biochar captures lead with high efficiency, offering a fast, green wastewater treatment option.Stay informed with the latest scientific insights, evidence-based independent research and discoveries on the ECS, cannabis medicine and more

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