Cempedak durian as a potential biosorbent for the removal of Brilliant Green dye from aqueous solution: equilibrium, thermodynamics and kinetics studies

Abstract

Cempedak durian peel (CDP) was used to remove Brilliant Green (BG) dye from aqueous solution. The adsorption of BG onto CDP was studied as functions of contact time, pH, temperature, ionic strength and initial concentration. In order to understand the adsorption process and its mechanisms, adsorption isotherm and kinetics models were used. The experiments were done under optimized 2-h contact time and ambient pH. Adsorption study showed that the Langmuir model best fitted with experimental data, and the maximum adsorption capacity was determined as 0.203 mmol g(-1) (97.995 mg g(-1)). Adsorption kinetics followed the pseudo 2nd order model, and intraparticle diffusion is involved but not as the rate-limiting step while Boyd model suggests that film diffusion might be in control of the adsorption process. Fourier transform infrared (FTIR) analysis showed that OH, C=O, C=C and NH functional groups might be involved in the adsorption of BG onto CDP. Thermodynamic study suggested that the adsorption of BG onto CDP is endothermic with ΔH (o) value of 12 kJ mol(-1) and adsorption is feasible. Regeneration of CDP's ability to remove BG was also studied using three different washing solutions. NaOH (0.1 M) was not only sufficient to be used to regenerate CDP's ability to remove BG but also improved its adsorption capability.

Kinetics Modeling on the Biosorption of Remazol Black B Dye by Aspergillus flavus

“…The equilibrium sorption capacity qe in the original published paper was 4.37 mg/g, which is close to the remodeled value. The pseudo-1 st order model, due to its mathematical simplicity has found application together with the pseudo-2 nd order model in modelling numerous dye sorption kinetics [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Some works has suggested mechanism of sorption only basing with the kinetics results, which should not be done, as numerous current works have indicated that more results from isotherm, diffusion and thermodynamics works should be obtained before arriving at the conclusion [31][32][33][34][35][36][37][38].…”

Overview on the Potential of Coal-Based Bottom Ash as Low-Cost Adsorbents

“…Meanwhile for the Weber and Morris model, an intraparticle diffusion is the rate-limiting step if the linearized plot of q t against time passes the origin. 146,147 = − − − B F 0.4977 ln( 1)…”

Mechanistic insights into the adsorption of methylene blue by particulate durian peel waste in water

“…Utilization of durian peel waste as a biosorbent will overcome two problems at once: (i) reducing the volume of durian peel waste itself and (ii) eliminating the water contaminant when being used as an adsorbent. Durian peel has been reported to show promising performances for removing a number of contaminants, including metal cations such as Zn 2þ (Ngabura et al 2018) and Cd 2þ (Kaewsarn 2010), as well as synthetic dyes such as methyl violet (Dahri et al 2015a) and brilliant green (Dahri et al 2015b).…”