Insight into the co-pyrolysis of different blended feedstocks to biochar for the adsorption of organic and inorganic pollutants: A review

Co-pyrolysis of blended feedstocks has received increasing attention due to its significant role in avoiding the weakness of products made from normal pyrolysis of individual feedstocks. Many studies have shown that co-pyrolysis can enhance the yield and properties of biochar, e.g. improve pore structure, reduce ash content, increase heating value, and also enhance adsorption performance toward a variety of pollutants. In addition, co-pyrolysis has the added benefits of decreasing the quantity of waste and avoiding pollution issues. In this article, the co-pyrolysis of different feedstock blends to biochar has been reviewed. The influence of co-pyrolysis variables on the yield and properties of biochar has been discussed. The application of co-pyrolysis derived biochars as adsorbents for organic and inorganic pollutants has also been included. Important suggestions are proposed for the future development of the co-pyrolysis into biochar and its application. This article includes an overview on the most adopted and efficient feedstocks, significant affecting variables, extensively tested pollutants, well utilized adsorption models, and synergetic behavior in co-pyrolysis to biochar adsorbent. (C) 2020 Elsevier Ltd. All rights reserved.