Effect of acid-assisted hydrothermal carbonization (HTC) process of tree branches using nitric acid on cadmium adsorptionReza Khoshbouy, Rico Lejiu, Fumitake Takahashi and Kunio YoshikawaE3S Web Conf., 67 (2018) 03033DOI: https://doi.org/10.1051/e3sconf/20186703033