New Way of Synthesis of Basic Bismuth Nitrate by Electrodeposition from Ethanol Solution: Characterization and Application for Removal of RB19 from Water

Preparation of Alumina Oxo-Cluster/Cellulose Polymers and Dye Adsorption Application

Aluminum oxide clusters (AlOCs) possess high surface areas and customizable pore structures, making them applicable in the field of environmental remediation. However, their practical use is hindered by stability issues, aggregation tendencies, and recycling challenges. This study presents an in -situ synthesis of AlOCs on cellulose using a solvent thermal method. The resulting adsorbent's structural and property profiles were thoroughly characterized using multiple analytical techniques. Batch adsorption experiments were performed to assess the adsorbent's capacity and kinetics in removing selected dyes from aqueous solutions. Additionally, both real-environment simulation and regeneration experiments have been conducted to thoroughly assess the adsorbent's reliability, stability, and practical applicability. The aim was to engineer an effective and recyclable adsorbent specifically tailored for dye-contaminated wastewater treatment.

Microwave assisted green synthesized copper- carrageenan bionanocomposite for efficient removal of cefixime from defile water

Water contamination, particularly by antibiotics, poses a significant threat to both natural resources and human health due to the rise of antibiotic-resistant microorganisms. Addressing this issue requires an eco-friendly and effective solution. In this study, we synthesized a Copper-Carrageenan bionanocomposite for the photocatalytic degradation of Cefixime (CF) using a green route, avoiding traditional chemical methods. The reduction of metal ions was achieved using Argemone albiflora leaf extract, a medicinal plant not consumed by humans or animals. κ-Carrageenan, a biopolymer, encapsulated the CuO nanoparticles. The bionanocomposite was synthesized in a one-pot reaction and characterized by XRD, FTIR, TEM, XPS, and UV-Visible spectroscopy. XRD, FTIR, and EDS confirmed the incorporation of CuO nanoparticles within the carrageenan matrix. The size of the synthesized nanoparticles ranged from 11.9 to 13.8 nm, and the encapsulated BNC particles ranged from 6.8 to 4.9 nm. The bionanocomposite efficiently degraded 91.85 % of CF in 90 min under optimal conditions. Kinetic studies revealed that the photocatalytic degradation follows pseudo-first-order kinetics. Degradation conditions such as time, pH, catalyst concentration, and drug concentration were optimized. A 20 mg/L BNC catalyst was used to degrade a 20 ppm CF solution. The degradation intermediates were analysed by LCMS, and the degradation mechanism is discussed in this work.

Photocatalytic Degradation of Quinolones by Magnetic MOFs Materials and Mechanism Study

With the rising incidence of various diseases in China and the constant development of the pharmaceutical industry, there is a growing demand for floxacin-type antibiotics. Due to the large-scale production and high cost of waste treatment, the parent drug and its metabolites constantly enter the water environment through domestic sewage, production wastewater, and other pathways. In recent years, the pollution of the aquatic environment by floxacin has become increasingly serious, making the technology to degrade floxacin in the aquatic environment a research hotspot in the field of environmental science. Metal-organic frameworks (MOFs), as a new type of porous material, have attracted much attention in recent years. In this paper, four photocatalytic materials, MIL-53(Fe), NH2-MIL-53(Fe), MIL-100(Fe), and g-C3N4, were synthesised and applied to the study of the removal of ofloxacin and enrofloxacin. Among them, the MIL-100(Fe) material exhibited the best photocatalytic effect. The degradation efficiency of ofloxacin reached 95.1% after 3 h under visible light, while enrofloxacin was basically completely degraded. The effects of different materials on the visible photocatalytic degradation of the floxacin were investigated. Furthermore, the photocatalytic mechanism of enrofloxacin and ofloxacin was revealed by the use of three trappers (▪O2-, h+, and ▪OH), demonstrating that the role of ▪O2- promoted the degradation effect of the materials under photocatalysis.

Experimental investigation of the structural features of polycarbonate (PC) filled with bismuth nitrate pentahydrate (BNP) composite films in terms of free volume defects probed by positron annihilation lifetime spectroscopy

The effect of bismuth nitrate pentahydrate (BNP) on the properties and microstructural features of polycarbonate (PC) has been investigated using PALT, XRD, SEM, EDX, TG, ATR-FTIR and tensile mechanical measurements. Positron Annihilation Lifetime Spectroscopy reveals that the ortho-positronium lifetime and its corresponding intensity significantly decrease as the filler level of BNP in PC (in the composite) increases from 0.3 wt% up to 5.0 wt%. This is due to the increasing fraction of positrons that annihilate with the filler particles and also in the interfacial layers of the filler and the host polymer. Fourier Transform Infrared spectra show that there is no significant shift in the IR bands of the composite when compared to those of pure PC, and so there is little molecular level interaction between PC and BNP. The micrographs of SEM revealed a random distribution of filler particles in the composite, and there is the formation of agglomerates of BNP at higher filler levels. There is an increase in the degree of crystallinity of the composite films due to the addition of the crystalline filler, which was confirmed by XRD analysis. Tensile mechanical tests confirmed the improved tensile strength of prepared composites at lower and moderate filler levels, from 0.0 wt % up to 2.5 wt%. The free volume properties of the composite films are correlated with its tensile mechanical properties.