Abstract
In this study, the response surface methodology was used to predict the adsorption removal efficiency of activated carbon from palm kernel wastes. The effects of baseline-concentration (A: 0.5–0.7 mg/L), contact time (B: 7–9 H), absorbent dose (C: 600 −1000 mg), solution pH (D: 2 −12) and agitation speed (E: 100 – 250 rpm) were tested using Box–Behnken experimental design. The optimum adsorption removal efficiency (87.42%) was obtained at an optimal concentration of 0.6 g/mL, contact time of 7.45 h, the dosage of 822 mg, pH of 11.7 and agitation speed of 237 rpm with dosage and solution pH as the significant factors. Moreover, the quadratic model fitting had a high level of goodness-of-fit (p < 0.05), indicating that they successfully described the relationship between removal efficiency and the independent factors. The activated carbon from palm kernel wastes was shown to be a promising material for the removal of dissolved hydrogen sulfide from refinery wastewater.
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