Removal of basic dyes from solution using coconut shell charcoal Siriwan Srisorrachatr, Pariwat Kri-arb, Sirawit Sukyang and Chutima Jumruen MATEC Web Conf., 119 (2017) 01019 Published online: 04 August 2017 DOI: 10.1051/matecconf/201711901019