Process Parameters Optimization, Characterization, and Application of KOH-Activated Norway Spruce Bark Graphitic Biochars for Efficient Azo Dye Adsorption oleh Marine Guy, Manon Mathieu, Ioannis P. Anastopoulos, María G. Martínez, Frédéric Rousseau, Guilherme L. Dotto, Helinando P. de Oliveira, Eder C. Lima, Mikael Thyrel, Sylvia H. Larsson, Glaydson S. dos Reis