Enhanced adsorption performance of Reactive Red 120 azo dye from aqueous solution using quaternary amine modified orange peel powder

Publication date: Available online 18 April 2019Source: Journal of Molecular LiquidsAuthor(s): Venkata Subbaiah Munagapati, Jet-Chau Wen, Chih-Long Pan, Yuvaraja Gutha, Jyh-Horng WenAbstractOrange peel powder was chemically modified to enhance quaternary amine type content on the surface of adsorbent which was named as quaternary amine modified orange peel powder (QAMOPP). The effecting parameters on adsorption of Reactive Red (RR) 120 such as pH (2.0–9.0), contact time (0–300 min), adsorbent dosage (0.01–0.07 g/30 mL), initial RR120 concentration (100–1000 mg/L) and temperature (298–338 K) were studied. The QAMOPP was extensively characterized for its surface chemical bonding, morphological structure, and specific surface area, total pore volume and average pore diameter by employing FTIR, SEM and BET analysis. The experimental adsorption kinetic data followed the pseudo-second-order kinetic model equation with a regression coefficient of>0.9941 for all studied temperatures. The activation energy (Ea) is calculated to be 12.1 kJ/mol by using the Arrhenius equation. Adsorption isotherms of RR120 on QAMOPP were correlated with two- and three-parameter non-linearized isotherm equations viz. Langmuir, Freundlich, Dubinin-Radushkevich (D-R), Temkin, Sips, Toth, Khan and Redlich-Peterson (R-P). It was observed that the Langmuir (R2 = 0.9996) and Khan (R2 = 0.9991) were the best fit isotherm models to predict RR120 adsorption onto QAMOPP. pH study reve...
Source: Journal of Molecular Liquids - Category: Molecular Biology Source Type: research