Removal of Methylene Blue from Aqueous Solution by Adsorption onto Crofton Weed Stalk

Abstract

Crofton weed stalk (CWS) was used as an adsorbent to remove methylene blue (MB) from aqueous solution. The adsorbent was analyzed by FT-IR and observed by SEM. The porosity and pH zpc were measured. The effects of adsorbent dose, initial dye concentration, solution pH, and solution temperature were investigated. Models of the adsorption kinetics and isotherms were analyzed, and thermodynamic parameters were calculated at different temperatures. The results showed that the adsorption capacity of MB on CWS increased with increasing initial concentration from 10 to 40 mg/L and pH from 2 to 7. The amount of MB removed increased as the adsorbent dosage was increased from 0.2 to 1.2 g/L. The maximum dye adsorption capacity of 28 mg/g was reached at around 120 min in a solution of 40 mg/L. A pseudo-second-order kinetic model described the kinetics well, and the experimental data followed the Freundlich model. The calculated values of standard free energy (ΔG o ) and standard enthalpy (ΔH o ) were negative, which indicates the adsorption process is spontaneous and exothermic. The values of both free energy and ΔG o indicate that the adsorption is a physical process. This work shows CWS could be utilized as an effective adsorbent for treating dye wastewater.

Coconut Husk Adsorbent for the Removal of Methylene Blue Dye from Wastewater

“…All experiments were carried out at room temperature (25±2 °C) and atmospheric pressure (1 atm). The adsorbate, a solution of methylene blue (MB), was prepared using base treatment method with 0.5 M of NaOH as activating agent and stirring at room temperature as described by Wang and Li (2013), and dye concentrations were determined using an DR/4000U Spectrophotometer (HACH, Iowa, US). Characterization of the adsorbent was done.…”

“…The rate of combustion is directly proportional to carbon dioxide production, a significant greenhouse gas. Similarly, the rate of regeneration limits its utilization apart from the costly production (Wang and Li 2013). Recently, numerous approaches have been explored to determine a cheap and effective adsorbent derived from a variety of raw materials waste such as agro-waste.…”

Kinetic and Thermodynamics of Methylene Blue Adsorption onto Zero Valent Iron Supported on Mesoporous Silica

“…Due to the low content of NZVI, obvious diffraction peaks are observed at the 2θ of 35.07°, 53.89° and 31.59°. According to Petala et al, these small peaks suggests that NZVI was partially oxidized to Fe2O3 or Fe3O4 [22]. Figure 2a and 2b illustrates the FESEM image of NZVI and NZVI/MSNS, respectively.…”

“…Plot of both first and second order kinetic models are illustrated in Figure 6, while the kinetic parameters calculated were summarized Mesoporous silica 0.0084 11.24 [11] Low-Cost Natural Jordanian Tripoli 0.026 9.76 [28] Crofton weed stalk (CWS) 0.0120 17.575 [22] (a) (…”

Effect of Conditions of Carbon Sorbents Producing from Abies Bark on Their Structure and Sorption Properties

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