| Summary: | Cassava stem biochar (CSB) was produced by pyrolyzing CS at 500 degrees C for 2 hours at nitrogen environment. Proximate and ultimate analyses were conducted on CS and CSB. Batch sorption experiment on synthetic MG wastewater was optimized for the sorbent dosage, MG solution pH and contact time. Sorption data was analysed with linearized sorption kinetic and linearized isotherm models. Pyrolysis of CS produced carbon-rich and stable CSB with a yield of 11.94%. The optimum sorption sorbent dosage, MG solution pH and contact time are 1.67 g/L, > pH 7.4 and 10 minutes respectively. The sorption of MG by CSB was best described by the pseudo-second-order kinetic model and the Langmuir isotherm model. The Langmuir sorption capacity of CSB was 40.5 mg/g. Monolayer of MG molecules formed chemical bonds on the homogenous surface of CSB.
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