Decontamination of cationic and anionic dyes in single and binary mode from aqueous phase by mesoporous pulp waste

Abstract

This work addresses the development of mesoporous pulp waste (MPW) and its application in sequestering of methylene blue (MB) and methyl orange (MO) from single and binary mode. Adsorption interactions of dyes onto MPW were investigated using N 2 adsorption/desorption isotherm, fourier transform infrared (FTIR), scanning electron microscopy (SEM), energy dispersive X-Ray spectroscopy (EDS) P-XRD, thermo gravimetric analysis (TGA), pH PZC , macro, and micro analyses. The developed MPW showed the presence of surface functional groups (AOH, ACOOH groups), porous surface, higher BET surface area (1022.46 m ). The adsorption mechanisms of MB and MO onto MPW were governed by hydrogen bonding and p-p interactions. The adsorption kinetics of MB and MO are better reflected by pseudo second-order for single and binary system with good correlations. Thermodynamic parameters exhibited the adsorption process to be spontaneous and endothermic in nature accompanying the increase of entropy (the driving force for adsorption). The regeneration of the adsorbent was performed with 0.1 M NaOH and CH 3 COOH (99-100%). The low cost of the developed MPW (USD 42.43 per kg) justify its utilization in the removal of dyes from aqueous phase.

Simultaneous Adsorption of Cationic Dyes from Binary Solutions by Thiourea-Modified Poly(acrylonitrile-co-acrylic acid): Detailed Isotherm and Kinetic Studies

“…The results confirmed that the TMPAA polymeric adsorbent has more affinity towards MG than MB [57]. Similar antagonistic analogous trends could be noticed also in the binary dyes solution of remazol brilliant blue (RBB) and disperse orange (DO) [58], methylene blue (MB) and methyl orange (MO) [59], and methyl orange (MO) and phenol [41].…”

A novel synthesis of Fe2O3@activated carbon composite and its exploitation for the elimination of carcinogenic textile dye from an aqueous phase

“…20 According to the IUPAC classication of pore dimensions, there are three broad classi-cations grouped as micropore (diameter, d # 2 nm), mesopore (2 < d < 50 nm) and macropore (d $ 50 nm). 21 Most of the pores are mesopores, followed by a small fraction of micropores. The total pore volume (single point adsorption) of FAC is 0.9909 cm 3 g À1 and can verily accommodate the dye molecules.…”

Synthesis of novel biocomposite powder for simultaneous removal of hazardous ciprofloxacin and methylene blue: Central composite design, kinetic and isotherm studies using Brouers-Sotolongo family models

“…The pseudo-first-order model implies that the adsorption phenomenon is reversible [52]. In addition, this model supposes that the rate of adsorption is proportional to the difference in the concentration of saturation and the number of unoccupied sites by the adsorbates [53].…”