Search

In the current study, a novel composite (Fe3O4@MnO2@Al2O3) was prepared to remove crystal violet dye and cadmium from aqueous solutions. The coprecipitation method was utilized to synthesize the composite. Batch studies are carried out using a contact period of (0.5-3) hours, an initial crystal violet and cadmium content of (50-200) mg/L, an agitation speed of (50-200) rpm, a pH of (4-12), and a composite dosage of (0.2-1) g per 50 mL of contaminated solution. The isotherm and kinetics models are formulated the experimental data. XRD, SEM-EDS, and FTIR analysis were utilized for composite characterization. The results revealed that the removal efficacy of crystal violet dye was 99.311% at 1 g of adsorbent, pH 12, 50mg/L, 1 hour, and 200rpm. The removal efficacy for cadmium (Cd) is 99.7296% at 1 g of sorbent mass at pH 6, 50mg/L, 1 hour, and 200rpm. The outcomes demonstrated that the Langmuir model could accurately depict the sorption of crystal violet dye onto the composite with R2 (0.9882) and SSE (0.7084). Based on Freundlich, the composite's capacity to reflect cadmium sorption was assessed by its highest R2 (0.8947) and lowest SSE (8.5149). The pseudo-second-order model is a more realistic way to explain how cadmium and crystal violet dye sorb onto the composite. The results showed that the composite is effective in eliminating target pollutants, since cadmium has a maximum adsorption capacity of 48.5052 mg/g and crystal violet dye has a capacity of 40.9682 mg/g. Therefore, (Fe3O4@MnO2@Al2O3) can be used as efficient sorbent for removing Cd and crystal violet dye from synthetic industrial wastewater.

The increase in bacterial infections and the emergence of antibiotic resistance has led to the development of bio-derived and environmentally friendly nanomaterials to counteract bacterial activity, and silver nanoparticles AgNPs are a promising way to achieve this. The present work aimed to synthesize AgNPs from the blue-green algae Athrospira Platensis and evaluate their antibacterial efficacy against Enterococcus faecalis, Staphylococcus aureus, Proteus mirabilis, and Pseudomonas aeruginosa isolated from human urinary tract infections. The results were shown and confirmed by peak UV spectra at 450. Through SEM and DLS analyses, the shapes of the AgNPs were determined to be spherical and with sizes ranging from 15 to 100 nm. The zeta potential values of AgNPs were found to be −20 ± 3.2 mV indicating the absence of AgNPs aggregates. Synthetic AgNPs produced by A. platensis showed a strong antibacterial effect against bacteria isolated from human urinary tract infections. The diameters of the inhibitory zone for S. aureus E. faecalis P. mirabilis and P. aeruginosa 14 mm, 16 mm, 15 mm, and 12 mm, respectively. AgNPs showed the highest activity against E. faecalis strain, with the diameter of the inhibitory zone reaching 16 ± 0.2 mm at a concentration of 800 μg/mL.These results will be a useful resource for studying the effects of man-made nanoparticles on the environmental safety and represent a promising step toward realizing AgNP-based antimicrobial drug production.

The synthetic dye industry is a significant source of anthropogenic pollutants emitted into many water bodies across the world. Bioremoval is a substitute for industrial techniques for detoxifying dye-contaminated water. Green algae is an abundant microorganism processing to produce cost-effective, eco-friendly, and high-quality method to bioremediation by immobilization technique. In this present study, The effectiveness of the immobilized green alga Chlorella vulgaris to eliminate Congo red dye in both water and wastewater was assessed through the biodegradation Process under various conditions, including pH, concentration of dye, contact time, and NaCl. The results revealed that the removal increased with increasing contact duration, with the maximum bioremoval percentage occurring at 89.6% at a contact time of 13 days. The removal effectiveness of dye as the number of beads of immobilized C.vulgaris algae grew; the highest removal efficiency was achieved at 7-8 beads of immobilized C.vulgaris algae. There was also an inverse relationship between bioremoval and dye concentration; the maximum removal percentage was 90.1% at 0.1 M dye concentration. The highest removal efficiency was found in the range (91.3–86) at pH 6-7. The bioremoval of Congo red dye was similar in fresh and salinity water (87.2% and 85.3%, respectively). This study observed high removal efficiency for immobilized algae to Congo red under different concentrations of NaCl as an indicator of salinity, ranging between 85.3 and 87.2%.