Biochar from pyrolysis of rice husk biomass—characteristics, modification and environmental application

Cai

ACS Sustainable Chem. Eng.

et al. 2022

Harvesting Si-based anode materials from environmentally friendly and abundant Si-containing natural resources not only meets the needs of the constantly widening Li-ion battery (LIB) markets but also promotes the utilization of agricultural waste. Herein, we report the fabrication of an Si/C composite derived from rice husks (RHs) via a low-temperature AlCl 3 -assisted zincothermic reduction. Thermodynamically, the bio-SiO 2 blended with a carbon matrix is first transformed to SiCl 4 and then reduced by Zn powder to produce Si nanoparticles. Due to the internal contact of bio-Si and C derived from RHs, the prepared Si/C composite displays an outstanding electrochemical performance; a capacity of 1033 mAh g −1 can be achieved over 100 cycles under 1 A g −1 with 6.6% capacity loss. What is more, the capacity of the Si/C composite can be maintained at 745 mAh g −1 over 250 cycles under 2 A g −1 . In this work, a novel approach is developed to synthesize Si/C composites with the utilization of sustainable biomass resources for LIB anodes, enabling a high-value-added conversion for Si-based agricultural waste.

Section: ■ Results and Discussionmentioning

confidence: 91%

Zincothermic-Reduction-Enabled Harvesting of an Si/C Composite from Rice Husks for a Li-Ion Battery Anode

Cai

ACS Sustainable Chem. Eng.

et al. 2022

“…While steam/gas activation is simple, it consumes a lot of energy due to the high temperature required. As a result, microwave activation, ultrasonication, plasma treatment, and electrochemical modification strategies have recently grown in popularity as low-cost methods for increasing biochar adsorption capacity (Bushra and Remya 2020 ).…”

Section: Agronomymentioning

confidence: 99%

Biochar for agronomy, animal farming, anaerobic digestion, composting, water treatment, soil remediation, construction, energy storage, and carbon sequestration: a review

et al. 2022

In the context of climate change and the circular economy, biochar has recently found many applications in various sectors as a versatile and recycled material. Here, we review application of biochar-based for carbon sink, covering agronomy, animal farming, anaerobic digestion, composting, environmental remediation, construction, and energy storage. The ultimate storage reservoirs for biochar are soils, civil infrastructure, and landfills. Biochar-based fertilisers, which combine traditional fertilisers with biochar as a nutrient carrier, are promising in agronomy. The use of biochar as a feed additive for animals shows benefits in terms of animal growth, gut microbiota, reduced enteric methane production, egg yield, and endo-toxicant mitigation. Biochar enhances anaerobic digestion operations, primarily for biogas generation and upgrading, performance and sustainability, and the mitigation of inhibitory impurities. In composts, biochar controls the release of greenhouse gases and enhances microbial activity. Co-composted biochar improves soil properties and enhances crop productivity. Pristine and engineered biochar can also be employed for water and soil remediation to remove pollutants. In construction, biochar can be added to cement or asphalt, thus conferring structural and functional advantages. Incorporating biochar in biocomposites improves insulation, electromagnetic radiation protection and moisture control. Finally, synthesising biochar-based materials for energy storage applications requires additional functionalisation.

Section: Functional Modification Of Biocharmentioning

confidence: 99%

Section: Functional Modification Of Biocharmentioning

confidence: 99%

Functional Biochar Synergistic Solid/Liquid-Phase CO₂ Capture: A Review

et al. 2022

Nowadays, global warming is becoming more and more serious, while CO 2 capture technologies have emerged endlessly, with methods of solid-phase CO 2 capture for physical adsorption and liquidphase CO 2 capture for chemical absorption. Biochar has been widely used to achieve CO 2 sequestration and emission reduction as a result of its wide range of precursor sources, strong adsorption, and rich surface functional groups. It reviews the existing post-combustion CO 2 capture solutions, focusing on the analysis of CO 2 capture technologies based on liquid-phase ammonia/monoethanolamine and solid-phase carbonbased materials. The former (liquid phase) is with limitation of capture efficiency as a result of strong volatility and thermal degradation, while the latter (solid phase) is accompanied by limited CO 2 /N 2 selectivity. The realization of synergy between the two would "learn from each other's strengths" to improve the CO 2 adsorption ability. The review puts forward the concept of "biochar-functionalized crosslinking synergistic ammonia CO 2 capture technology", which not only broadens the idea of multi-level utilization of biochar, significantly improving the liquid-phase (ammonia) CO 2 capture efficiency, but also has practical significance for the utilization of biomass waste and reduction of CO 2 emissions.