A complete review on biochar: Production, property, multifaceted applications, interaction mechanism and computational approach

Abstract Burning crop residues release large amounts of greenhouse gases, particulate matter, carbon monoxide, etc. which influence a lot of environmental issues that are hazardous to all living beings including humans. One of the useful methods of using crop residues is in the form of biochar obtained after employing thermo-chemical routes. Apart from the crop residues, the carbon rich contents obtained from forest, animal compost, waste plastics, etc., can be heated in oxygen starved atmosphere, that left char having enriched carbon and trace amount of minerals finds extensive applications in agriculture, especially to make soil more fertile, as a carbon sequestration agent, increases crops yields, etc. This review focuses on the synthetic strategies adopted to obtain biochar, and the numerous applications in various fields. Further, the interactions involved in between the host–guest molecules are explained using computational studies like Density Functional Theory, Artificial Neural Network analysis, Machine Learning methods, and Visual MINTEQ program.