Mabaso, T., Lo, SL. & Chiueh, PT. Effect of pyrolytic temperature on the adsorption of Pb(II) from synthetic wastewater onto bamboo chopstick biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More: a conventional vs. microwave-assisted pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More approach. Sustain Environ Res34, 31 (2024). https://doi.org/10.1186/s42834-024-00238-6

A recent study explored how bamboo chopstick waste can be transformed into biochar for removing lead (Pb(II)) from synthetic wastewater. Two pyrolysis methods were compared: Conventional Pyrolysis (CP) and Microwave-Assisted Pyrolysis (MAP). These methods produce biochar, a carbon-rich material known for its environmental applications.

The researchers tested biochar samples made at different temperatures and power levels to analyze their capacity to adsorb lead. MAP biochar showed higher surface area and porosityPorosity of biochar is a key factor in its effectiveness as a soil amendment and its ability to retain water and nutrients. Biochar’s porosity is influenced by feedstock type and pyrolysis temperature, and it plays a crucial role in microbial activity and overall soil health. Biochar More than CP biochar, making it more effective in adsorption. Specifically, biochar produced at 450 W using MAP achieved the highest lead removal efficiency (99.9%), outperforming biochar produced via CP.

Batch adsorption experiments revealed that low adsorbent doses (2 g/L) and initial lead concentrations of 50 mg/L yielded the best results. The Langmuir isotherm model showed that Pb(II) adsorption occurs on a monolayer of the biochar surface, while pseudo-second-order kinetics indicated chemisorption as the main mechanism.

This study highlights MAP as a more efficient and sustainable approach for producing biochar, especially in reducing production time and energy use. By repurposing disposable bamboo chopsticks, which contribute significantly to waste, this solution not only tackles water pollution but also supports waste management and circular economy goals.

Future research will focus on optimizing the process for other contaminants and scaling up production for broader environmental applications.