Adsorption Characteristics of Alkali Fuchsia by Sweet Potato Dregs by Chemical Modification
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Abstract:
The modified sweet potato residue biosorbent was obtained by chemically modifying the waste sweet potato residue as raw material, and it was used for the adsorption of the basic fuchsin of the printed matter in the aqueous solution. Effects of modified sweet potato slag addition amount, particle size, initial concentration of basic fuchsin solution, solution pH, adsorption temperature and adsorption time on the adsorption rate were investigated. The initial concentration, addition amount and time showed significant effects. By using quadratic orthogonal rotating combination design, the optimum initial concentration, addition amount and time were determined as 200 mg/L, 0.8 g and 140 min, respectively. The measured adsorption rate was 97.38%, which is similar to the predicted maximum value of 97.66%. The adsorption equilibrium test showed that the adsorption of sweet potato residues on basic fuchsin was consistent with Langmuir and Frundlich model, and the maximum adsorption capacity was 37.17 mg/g. The adsorption kinetics can be described by quasi - second order kinetic equations. BET test and SEM observation showed that the modified sweet potato residue was optimized for porous surface and increased wrinkles, which was beneficial to the adsorption process. According to FTIR and EDS, hydroxyl and carboxyl groups play major roles in the adsorption process.
