Enoki mushroom residue-derived porous carbon as a high-quality adsorbent toward methylene blue

Enoki mushroom residue-derived porous carbon (EMRPC) was prepared using a simple ZnCl2 activation method. Scanning electron microscopy, Thermogravimetric analysis, N2 adsorption–desorption tests, X-ray diffraction, Raman spectroscopy, and Fourier-transform infrared spectroscopy were used to analyse the morphology, structure, and chemical composition of EMRPC. The effects of solution pH, initial dye concentration, adsorption time, and temperature on the adsorption of methylene blue (MB) dye by EMRPC and the recycling performance of EMRPC were investigated. The results demonstrated that EMRPC presented remarkable porosity and abundant surface groups. Moreover, the adsorption capacity of EMRPC for MB reached 437.5 mg g− 1. The solution pH, initial MB concentration, adsorption time, and temperature affected the adsorption performance of EMRPC. The MB adsorption data fitted the pseudo-second-order kinetics and Freundlich isotherm models. The removal rate of MB exceeded 99.86