Fig. 3From: Enhanced phosphate adsorption and desorption characteristics of MgO-modified biochars prepared via direct co-pyrolysis of MgO and raw materialsSEM images of unmodified biochars (RS, CS, OT, and GW), modified biochars (MRS, MCS, MOT, and MGW), and PO-loaded biochars (MRS–PO, MCS–PO, MOT–PO, and MGW–PO) and EDX mapping of MRS–POBack to article page