Humic Acid Based Biopolymeric Membrane for Effective Removal of Methylene Blue and Rhodamine B

Abstract

Humic acid was immobilized on a polypropylene supported sodium alginate/hydroxyethyl cellulose blend membrane in the current work. The adsorption property of this membrane for the removal of cationic dyes, namely, methylene blue (MB) and rhodamine B (RhB) was extensively studied. Batch-adsorption experiments were conducted to investigate the adsorption behavior of dyes on the membrane with variation in adsorbent mass, initial dye concentration, pH, time and temperature. The membranes were characterized by Scanning electron microscopy (SEM), Energy dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FTIR) and Atomic force microscopy (AFM). Prepared membranes showed more than 98% removal capacity for both dyes under optimal conditions. Kinetic experiments revealed that, the pseudo second order model exhibited best correlation with the adsorption data. Dubinin-Radushkevich model indicated that, the adsorption of dyes onto the membrane surface was by simple physisorption. The membrane was easily regenerated by simple acid treatment and its efficiency remained significant even after four adsorption cycles.

Surface-bound humic acid increased rhodamine B adsorption on nanosized hydroxyapatite

“…Additionally, HA could also immobilize on a polypropylene supported sodium alginate/hydroxyethyl cellulose blend membrane, making removal of methylene blue and RhB from water more effective. [32] Based on these results, it could be inferred that the existence of carboxylic and phenolic groups results in HA carrying a net negative charge over the usual pH values, which can enhance the adsorption of cationic dyes through electrostatic interaction. As for nHAP, it is expected that the surface modification of nHAP with HA would significantly enhance the adsorption capacity of nHAP towards the cationic dyes such as RhB.…”

Adsorptive Removal of Textile Dye Direct Blue 9 from Aqueous Solution by Nano-Sized Polymers: Kinetic and Thermodynamic Studies

“……where q e is the amount of dye adsorbed by polymer at equilibrium condition (mg/g), q t is the amount of dye adsorbed by polymer at time t (min), and k 1 (1/min) and k 2 (g/mg min) are the equilibrium rate constants for pseudo first-and second-order kinetic models, respectively. For the pseudo first-order kinetic model, k 1 and q e are obtained from the slope and intercept of the plot of ln(q e -q t ) versus t, respectively [50]. For the pseudo second-order kinetic model, k 2 and q e are determined from the slope and intercept of the plot of t/q t versus t, respectively [51,52].…”

Application of Red Mud in Wastewater Treatment

“…Ion exchange is the main mechanism of the adsorption process [79,80]. ARM was used to remove the Congo red dye in the batch adsorption experiment.…”