Adsorption kinetic studies for removal of methylene blue using activated carbon prepared from sugar beet pulp

Abstract

Sugar beet pulp is an abundant, renewable and low-cost precursor for production of activated carbon. In the present study, sugar beet pulp based activated carbon was prepared by using phosphoric acid as activating agent for adsorption of methylene blue. The conditions of preparation process had a significant influence on the adsorption of methylene blue, and the optimal preparation conditions were obtained as follows: liquid-to-solid ratio of 5, temperature of 450°C and phosphoric acid concentration of 3 mol/L. The properties of sugar beet pulp based activated carbon were characterized by nitrogen adsorption isotherm. The adsorption increases as the increase of contact time, adsorption temperature and pH, and initial concentration of methylene blue. Batch kinetic studies showed that an equilibrium time of 100 min was needed for the adsorption, and the adsorbance of methylene blue is 244.76 mg/g at equilibration. Kinetic models, Weber's pore diffusion model and Boyd's equation were applied to the experimental data to study the mechanism of adsorption and the controlled step. The results showed that the adsorption kinetics followed the pseudosecond-order type kinetic model, intraparticle diffusion was not the rate-limiting mechanism and adsorption process was controlled by film diffusion.

Activated Carbon from Prickly Pear Seed Cake: Optimization of Preparation Conditions Using Experimental Design and Its Application in Dye Removal

“…e yield of the activated carbon prepared under the optimal conditions was 56.48%. e methylene blue adsorption capacity of the activated carbon obtained in this study is comparable to or greater than that of the activated carbons found in literature [38][39][40][41][42][43]. Figure 2 shows SEM micrographs of raw prickly pear seed cake and optimal activated carbon.…”

Preparation of Activated Carbon from Acacia (Vachellia seyal) Tree Branches and Application to Treat Wastewater Containing Methylene Blue Dye

“…As methylene Blue (MB) dye is one of the common dye in the textile effluent removal of MB dye from synthetic wastewater was tested by using PAC (Shah et al, 2016;Li et al, 2016). During adsorption study stock solution of MB by dissolving 100 mg in one liter of distilled water was prepared and consequently various dilutions were prepared according to need.…”

“…In the chemical activation the carbonization and activation steps are carried out simultaneously. A raw material is impregnated with a chemical activating agent and heat-treated under inert atmosphere (Li et al, 2016). Phosphoric acid activation of lignocellulosic materials has become an increasingly used method for the large-scale manufacture of ACs in the last 20 years because phosphoric acid activation has environmental benefits and several other advantages, such as ease of recovery as compared to zinc chloride activation, low energy cost, and high char yield (Lim et al, 2010).…”

Use of zeolites for macronutrients removal from wastewater

“…Mass transfer during the adsorption process can also be controlled by external and internal diffusion (intra-particle diffusion). When the adsorbate diffusion in adsorbent pores is the adsorption rate-determining step, the intra-particle diffusion rate constant can be obtained from the Weber and Morris equation (Nagy et al, 2013;Li et al, 2016) q t = k ip t 0.5…”