Enhanced adsorption of Methylene blue with walnut shell carbon chemically activated by K2CO3

In this study, walnut shell-based activated carbon (WSAC2-900) was prepared by pyrolysis-carbonization coupled with chemical activation of K2CO3 for the first time. The samples were characterized by XRD, nitrogen adsorption/desorption, SEM and FTIR. In addition, the zero-point potential pHpzc was determined. The specific surface area of WSAC2-900 reached 1690 m2/g, and the total pore volume was 0.73 cm3/g, of which 87.7