Adsorption studies of methylene blue onto activated saw dust: kinetics, equilibrium, and thermodynamic studies

Abstract

This study is devoted to the application of activated saw dust (ACSD) as adsorbent for the removal of “methylene blue (MB)” from the aqueous solutions. Raw saw dust was activated by a simple and low cost chemical method. After activation, adsorbent was characterized by scanning electron microscopy for its surface characteristics. Brunauer‐Emmett‐Teller surface area and average particle size were determined and found to be 74.23 m2/g and 700 µm, respectively. Removal efficiency of adsorbent for MB was demonstrated by batch adsorption experiments. pH study indicates that 9.5 pH is optimum for higher removal of MB. Temperature studies revealed exothermic nature of adsorption process. On studying kinetic models, it was observed that removal process is governed by pseudo‐first‐order kinetics. Intraparticle diffusion study revealed that it is not rate limiting step in removal process. Mass transfer coefficient was also determined. Value of ΔG° was found to be negative at all studied temperature which confirms the feasibility of process. Langmuir's adsorption isotherm was found to be suitable for this system. This study revealed that ACSD can be used as alternates of costly adsorbents for the removal of MB from effluents. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 790–799, 2014

Performance, kinetics, and equilibrium of methylene blue adsorption on biochar derived from eucalyptus saw dust modified with citric, tartaric, and acetic acids

“…No significance difference in solution pH was observed after and until the end of adsorption. Neutral condition or even alkaline condition is beneficial for MB adsorption (Banerjee et al, 2014;Sajab et al, 2011). However, in this study, MB adsorption efficiency was higher for BC-CA than that for BC-TA and BC-AA.…”

“…This band is assigned to the carboxyl group (COOH) of organic acid. Moreover, the band at approximately 3430 cm À1 represents the stretching vibration of the hydroxyl group (AOH) (Banerjee et al, 2014). Both bands reflect the introduction of the carboxyl group on the surface of the biochar samples.…”

“…Therefore, a saturation point is reached when no further adsorption occurs at equilibrium. Linearization is expressed as follows (Banerjee et al, 2014;Shih, 2012):…”

Preparation and characterization of activated carbons from biomass material – giant knotweed (Reynoutria sachalinensis)

“…These can be industrial wastes, such as by-products of the petroleum industry [8], used tires [9] and polymer resins [10,11]; biomass waste, i.e. agricultural residues [13][14][15], cones [16,17], bamboo waste [18][19][20], saw dust [21]; or food-processing wastes, such as sugarcane bagasse [22]. Such approaches improve the utilization, recovery and reuse of waste and reduce the cost of the final product [23].…”

Comparative Adsorption of Methylene Blue on Different Low Cost Adsorbents by Continuous Column Process

“…Adsorption has received considerable attention for color removal from wastewaters as it offers the most economical and effective treatment methods. Due to high cost of activated carbon, adsorption on natural materials such as sand [5][6][7], saw dust [8][9][10][11], rice husk [10][11], used tea leaves [13][14], coconut coir [15], bagasse [16][17], banana pith [11], fly ash [10][11], orange peel [18] and modified biomaterials [19][20][21] have received considerable interest because of their local availability and their practically low cost. Use of above biomass materials [8][9][10][11][12][13][14][15][16][17][18][19][20][21] in batch adsorption process has been found to be highly effective, cheap and eco-friendly.…”