Enhanced removal of amoxicillin and chlorophenol as a model of wastewater pollutants using hydrogel nanocomposite: Optimization, thermodynamic, and isotherm studies

Studies have been conducted to gain understandings and generic knowledge of the equilibrium aspects of adsorption of different adsorbents, SA-Bn-TiO2 NPs surfaces. Removal of two pollutants, Amoxicillin drug AMX, 4-chlorophenol (CPH) from aqueous solutions by adsorption with SA-Bn-TiO2 NPs, SA-Bn and TiO2 NPs surfaces were experimentally determined. The best results were found at pH 6.6, temperature 30 ºC, and adsorbent dosage of 0.05 g of SA-Bn-TiO2 NPs for both studying adsorption capacity and removal percentage. The morphology and structure of the SA-Bn-TiO2 NPs hydrogel beads were investigated utilizing Ultraviolet-Visible Spectroscopy (UV–Vis), Fourier Transform Infrared (FT-IR), Thermo gravimetric analysis (TGA), Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-Ray (EDX) and X-ray Diffraction Spectroscopy (XRD). The best contact time for equilibrium reached one hour. It is essentially due to saturation of the active site which does not let further adsorption to take place. For the two pollutants onto hydrogel, best adsorption was found to be at pH 11, and adsorption raised by increase in the pH solution. The value negative of ∆G confirmed that the nature adsorption process is spontaneous. The value positive of ∆S confirmed the raise randomness at the solid-solution interface pending adsorption and the value positive of ∆H confirmed that adsorption process is endothermic

Highly adsorption of alginate/bentonite impregnated TiO2 beads for wastewater treatment: Optimization, kinetics, and regeneration studies

In this work, we prepared an eco-friendly, simple, stable new adsorbent SA-Bn-TiO2 NPs hydrogel and Comparative between SA-Bn-TiO2 NPs, SA-Bn, and TiO2 NPs surfaces as adsorbents. The best results of the percentage of removal (E%) of two pollutants including Amoxicillin (AMX) and 4-chlorophenol (CPH) arranged in the order of increasing as SA-Bn-TiO2 NPs > SA-Bn > TiO2 NPs. The good results of the percentage of removal (E%) of SA-Bn-TiO2 NPs were 87.56% and 82.56 for AMX and CPH at the same order. Kinetics adsorption models of two pollutants on SA-Bn-TiO2 NPs was studied and modelled utilizing three adsorptions kinetic. The classification of the kinetic models according to the simulation of the adsorption study is pseudo first order chemisorption. Recyclability and desorption studies indicated the better reusing performance of the prepared composite. Based on the results, the prepared nano-composites can be useful as a promising, cost-effective, environmentally friendly, and efficient material for pollutant decontamination. Studies was carried out utilizing several desorption agents at various concentrations (0.01, 0.05 and 0.1 N) including HNO3, H2SO4, HCl, NaOH, H3PO4, ethanol, acetone and water. The SA-Bn-TiO2 NPs was regeneration with 100% using water

Enhanced Pollutant Adsorption and Antibacterial Activity of a Hydrogel Nanocomposite Incorporating Titanium Dioxide Nanoparticles

This research delineates the synthesis and subsequent application of a hydrogel nanocomposite enriched with titanium dioxide (TiO2) nanoparticles as an adsorbent for pollutants and an antibacterial agent. The nanocomposite was prepared using a hydrothermal method, facilitating the efficient incorporation of TiO2 nanoparticles. Physicochemical characterizations revealed the nanocomposite’s augmented adsorption capabilities, specifically for pollutants such as Congo red dye (CR), Amoxilline drug (AMX), and Chlorophenol (CPH). Notably, the study demonstrated that the nanocomposite could be completely regenerated and desorbed in water, attesting to its potential for recyclability. The antibacterial potential of the nanocomposite was also investigated, demonstrating significant efficacy against Gram-negative bacteria (E. coli and Klebsiella spp.) compared to Gram-positive strains. The findings of this study emphasize the potential applicability of the hydrogel nanocomposite as an efficient, reusable agent for pollutant removal and antibacterial activity, providing pertinent insights for environmental remediation and biomedical applications

Integrated Biorefineries for Algal Biomolecules

Algae are a renewable source of biomolecules for multiple applications ranging from fuels to specialties. However, their implementation as feedstock in industrial processes has only been achieved for few high-value products. This is due to the elevated costs in cultivation and downstream processing. In order to decrease the biorefinery costs and to enhance the overall process profitability, new separation processes need to be developed. Such processes must start from the understanding of the cell architecture, as a basis to develop an optimal fractionation strategy, and must include selective and mild disentanglement processes, in order to preserve the functionality of the target molecules. In this regard, we propose novel integration concepts such as self-disintegration, simultaneous disintegration and disentanglement, and self-separating systems within the framework of process intensification, in such a way that auxiliary chemicals, solvents and numerous unit operations become redundant