Review on Rice Husk Biochar as an Adsorbent for Soil and Water Remediation

Rice husk biochar (RHB) is a low-cost and renewable resource that has been found to be highly effective for the remediation of water and soil environments. Its yield, structure, composition, and physicochemical properties can be modified by changing the parameters of the preparation process, such as the heating rate, pyrolysis temperature, and carrier gas flow rate. Additionally, its specific surface area and functional groups can be modified through physical, chemical, and biological means. Compared to biochar from other feedstocks, RHB performs poorly in solutions with coexisting metal, but can be modified for improved adsorption. In contaminated soils, RHB has been found to be effective in adsorbing heavy metals and organic matter, as well as reducing pollutant availability and enhancing crop growth by regulating soil properties and releasing beneficial elements. However, its effectiveness in complex environments remains uncertain, and further research is needed to fully understand its mechanisms and effectiveness in environmental remediation.

Automated summary

Rice husk biochar (RHB) is a low-cost and renewable resource that has shown high effectiveness in remediation of water and soil environments. Its properties can be modified through preparation process parameters and physical, chemical, and biological means. RHB performs poorly in solutions with coexisting metal, but can be modified for improved adsorption. It has been found effective in adsorbing heavy metals and organic matter, reducing pollutant availability, and enhancing crop growth in contaminated soils. However, further research is needed to understand its effectiveness in complex environments.