Effects of NaOH Activation on Adsorptive Removal of Herbicides by Biochars Prepared from Ground Coffee Residues

In this study, the adsorption of herbicides using ground coffee residue biochars without (GCRB) and with NaOH activation (GCRB-N) was compared to provide deeper insights into their behaviors mechanisms. The physicochemical characteristics GCRB GCRB-N were analyzed Brunauer–Emmett–Teller surface area, Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction effects pH, temperature, ionic strength, humic acids on identified. Moreover, kinetics isotherms studied. specific area total pore volume (405.33 m2/g 0.293 cm3/g) greater than those (3.83 0.014 cm3/g). GCBR-N could more effectively remove (Qe,exp Alachlor = 122.71 μmol/g, Qe,exp Diuron 166.42 Simazine 99.16 μmol/g) 11.74 9.95 6.53 μmol/g). These results suggested that chemical might be a promising option make practical effective for removing in aqueous solutions.