Ficus religiosa bark an efficient adsorbent for Alizarin Red S dye: Equilibrium and kinetic analysis

Abstract

The discharge of unsafe colour dyes into the effluents of various industries can harm the environment and human health and therefore needs remediation. The current research assesses the environmental friendly decontamination of the Alizarin Red S (ARS) dye from industrial aqueous effluents by powder bark of a low-cost and indigenous plant, Ficus religiosa, as a biosorbent. The biosorbent was processed, powdered, and then characterized via SEM and FTIR spectroscopy before and after exposure to ARS. For maximum dye-decontamination of industrial effluents, adsorption parameters including dosage of the biosorbent, contact time between the dye and the biosorbent, shaking time and temperature of the adsorption process were optimized. SEM images confirmed the presence of high surface area active binding sites and FTIR analysis shows that the adsorption of ARS on the adsorbent is due to groups like -OH, ─NH, ─CH, C=O and C=C. The kinetics study of the adsorption follows pseudo-second order kinetic model. Best fit isotherm to the equilibrium data was obtained for Langmuir and Freundlich models. The decontamination ARS from aqueous phase by the adsorption process could be an inexpensive and viable way of protecting humans from carcinogenicity, DNA mutagenicity, jaundices, allergies and skin irritations.

Ionic Liquid Cross-Linked High-Absorbent Polymer Hydrogels: Kinetics of Swelling and Dye Adsorption

“…For both CPAam and CPHEMA hydrogels, there were chances of H-bonding interactions between the N atom of CV with the amide and hydroxyl protons of the −CONH 2 and −COO­(CH 2 CH 2 )­OH groups of CPAam and CPHEMA, respectively, as reported earlier. , In addition to H-bonding interactions, the aromatic rings of both of the organic dye molecules and hydrogel scaffold were able to interact through π–π stacking interactions. ,− Considering CPAam 10 -ILB 1 and CPHEMA 10 -ILB 1 hydrogels as the representative samples, the above-mentioned physical interactions between CV dye molecules and the hydrogel network during the adsorption process were confirmed from the FTIR spectra of the CV dye adsorbed hydrogel samples. From Figures S10 and S11, it was clear that each of the characteristic FTIR bands of CPAam 10 -ILB 1 and CPHEMA 10 -ILB 1 samples underwent a significant decrease in the absorption band depth (increase in % T ) after the adsorption of CV dye, indicating that the functional groups/aromatic moieties present in the gel network were masked after their interactions with dye molecules. , The π–π interactions between phenyl moieties of CV and both of the imidazole and styryl moieties of ILA cross-linker present in the hydrogel network (Figure D) may result in higher percentages (72.4 and 63.8) of CV adsorption for ILA-based hydrogels compared to those (26.11 and 30.62) for ILB-based hydrogels.…”

“…From Figures S10 and S11, it was clear that each of the characteristic FTIR bands of CPAam 10 -ILB 1 and CPHEMA 10 -ILB 1 samples underwent a significant decrease in the absorption band depth (increase in %T) after the adsorption of CV dye, indicating that the functional groups/ aromatic moieties present in the gel network were masked after their interactions with dye molecules. 49,50 The π−π interactions between phenyl moieties of CV and both of the imidazole and styryl moieties of ILA cross-linker present in the hydrogel network (Figure 3D) may result in higher percentages (72.4 and 63.8) of CV adsorption for ILA-based hydrogels compared to those (26.11 and 30.62) for ILB-based hydrogels.…”

Cost-effective approach for fabrication of high-quality expanded vermiculite for Alizarin red S removal from aqueous media

“…The annual amount of dye released into environmental e uent exceeds 50,000 tons [12]. Organic dyes can be extracted from water using various techniques, including precipitation, ltration, photocatalytic degradation, electrochemistry, adsorption, and biology [11,[13][14][15]. One of the most often used methods for getting rid of organic dyes from water is adsorption.…”