The adsorptive removal of cationic dye from aqueous solution using Poly (methacrylic acid) Hydrogels:Part-I. equlibrium studies

Abstract

In this work poly(methacrylic acid) hydrogels were prepared by free radical aqueous polymerization of methacrylic acid(MAc) using N,N'-methylene bisacrylamide (MB) as crosslinker and potassium persulfate (KPS) as initiator. The hydrogels were characterized by FTIR and TG analysis. The gels exhibited pH-dependent swelling behavior, with equilibrium percent mass swellings of about 110 and 403 at pH 1.0 and 7.4 respectively. The swelling exponent, n, was found to be 0.31 and 0.59 respectively, thus indicating a diffusion controlled and chain relaxation controlled swelling at these pH values respectively. The equilibrium adsorption of a cationic dye Methylene Blue (MB) was studied at 25 0 C using the Langmuir and the Freundlich adsorption isotherm models. The maximum sorption capacity Q 0 was found to be 169.43 mg/g . The equilibrium dye uptake was found to increase with the pH of the adsorbate medium and attained an optimum value of 77.8 mg/g for the initial dye concentration of 200 mg/L at 25 0 C at pH 5.2. The adsorption showed negative temperature dependency thus suggesting exothermic nature of the adsorption process. Finally, the various thermodynamic parameters were also evaluated.

Thermodynamic, Kinetic and Isotherm Study of 4-chloro-2-methyl Phenoxy Acetic Acid (MCPA) by (PV/S-g-3D-GO/N) from Aquatic Solutions

“…Adsorption isotherms indicate the interaction between adsorbate and adsorbent in the liquid phase (free adsorbate solution) concentrations and the solid phase (adsorbent-attached solute) concentrations at constant temperature (36). Therefore, Langmuir, Freundlich, Temkin and Redlich-Peterson models were used in this study.…”

Enhanced Removal of Golden XGL Dye by Clay Composites: Batch and Column Studies

“…The results of adsorption of basic dyes onto adsorbents in a continuous system were presented in the form of breakthrough curves that showed the loading behavior of dyes to be adsorbed from the solution expressed in terms of normalized concentration defined as the ratio of the outlet dye concentration to the inlet dye concentration as a function of time (C t /C o vs. t). Enhanced Removal of Golden XGL Dye... Breakthrough capacity Q 0.5 (at 50 % or C t /C o = 0.5) expressed in mg of dye adsorbed per gram of adsorbent was calculated by the following equation: (2) Adsorbent Characterization FTIR of native clay, MnFe 2 O 4 /clay composite (composite that showed highest adsorption capacity), and dye-loaded composite were carried out to identify the chemical functional groups responsible for sorption. FTIR data were observed over 400-4,000 cm -1 by preparing KBr disks of sorbent material, and spectra were recorded using Bio-Rad Merlin software.…”

Adsorption of textile dyes present in aqueous solution and wastewater using polyelectrolytes derived from chitosan

“…Diverse materials have been employed as adsorbents, such as kaolin, pearlite, dolomite, zeolites, activated carbons prepared from agricultural wastes, and polymers, as well as natural materials such as starch, cellulose, and cyclodextrins . Polyelectrolytes are a type of polymer which can be used as adsorbent materials . Polyelectrolytes have proven a good alternative to remove textile dyes from wastewater .…”