LAUSR

Biochar has been recognized as a promising tool for carbon sequestration and heavy metal removal from contaminated water. To promote the application of biochar in environment improvement, the effects of exogenous minerals on carbon sequestration and Pb removal capacity of biochars were investigated. In this study, the original biochar and the co-pyrolysis biochars were prepared by co-pyrolyzing rape straw (RS) with phosphate rock (PR) in proportions of 1:0, 5:1, 2:1, and 1:1 (w:w) at 500 °C and maintaining them for 2 h, and the effects of co-pyrolysis of RS with PR on the carbon retention, aromaticity, graphitization, and Pb removal capacity of biochars were analyzed. Thermogravimetric analysis showed that PR might prevent the degradation of RS during pyrolysis. Compared with original biochar, the carbon retention of co-pyrolysis biochars increased by up to 27.5%, but the aromaticity and graphitization of co-pyrolysis biochars were reduced because the ratios of H/C and ID/IG (disordered peak/graphite peak...