Azo dyes are widely used in various industries. These substances produce toxic byproducts in aquatic environments in addition to their mutagenic and carcinogenic potential effects. In this study, the effect of magnetite nanoparticles and magnetite nanoparticles modified by sodium alginate in batch systems and nonlinear kinetic and adsorption isotherm models were investigated. Magnetite nanoparticles were synthesized by chemical co-precipitation method and then modified and used as adsorbent to adsorb Acid Red 18. After determining the optimum pH and adsorbent dose, non-equilibrium models for kinetic adsorption were tested with concentrations (25-100 mg/L) and at eight different periods of time (1-15 min) and the pseudo-first-order and pseudo-second-order non-linear models were used to describe the results. For adsorption isotherm, a contact time of 120 min was studied in different concentrations (25-100 mg/L) and the residual concentration of Acid Red 18 was obtained. The results are described by non-linear Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. The optimum amounts of pH for magnetite nanoparticles and for modified ones were 3 and 5, respectively, the efficiencies were 0.75 and 0.2 g/L, respectively. According to the results sodium alginate has a high performance in adsorption of Acid Red 18. Adjusted correlation coefficients and chi-square test showed that Freundlich isotherm and then Langmuir isotherm can well describe the experimental results. In Freundlich, the value of (Kf) was 3.231 (L/g) for magnetite nanoparticles and 21.615 (L/g) for modified adsorbent. In Langmuir, the value of (qm) was 16.259 (mg/g) for magnetite nanoparticles and 73.464 (mg/g) for modified adsorbent. Comparing the Langmuir maximum calculated adsorption capacity indicated that modified adsorbent can adsorb the pollutants 6.5 times more than the other one.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.2166/wst.2016.320 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Exploring Solid Magnetic Liposomes for Organic Pollutant Removal from Wastewater: The Role of Lipid Composition.
ACS Appl Mater Interfaces
January 2025
Department of Physical and Chemical Sciences, Università degli Studi dell'Aquila, L'Aquila 67100, Italy.
Solid magnetic liposomes (ML, nanocomposites comprising lipid bilayers that incorporate magnetic nanoparticles) may be used in wastewater remediation: the lipid bilayer creates an environment where organic pollutants preferentially partition instead of water and the manipulation of ML with an external magnet enables an easy recovery from water. This study aimed to assess the system's potential for water remediation, focusing on ML ability to remove common pollutants in industrial wastewater. Specifically, alkylphenol ethoxylates (APEO) were used as the archetype for organic pollutants.
View Article and Find Full Text PDFSuperparamagnetic nanoparticles as potential systems for the treatment of Duchenne muscular dystrophy.
Nanoscale
January 2025
Department of Chemistry, Federal University of São Paulo (UNIFESP), Diadema, SP, Brazil.
This study aims to use superparamagnetic iron oxide nanoparticles (SPIONs), specifically magnetite (FeO), to deliver deflazacort (DFZ) and ibuprofen (IBU) to Duchenne muscular dystrophy-affected (DMD) mouse muscles using an external magnetic field. The SPIONs are synthesized by the co-precipitation method, and their surfaces are functionalized with L-cysteine to anchor the drugs, considering that the cysteine on the surface of the SPIONs in the solid state dimerizes to form the cystine molecule, creating the FeO-(Cys)-DFZ and FeO-(Cys)-IBU systems for tests. The FeO nanoparticles (NPs) were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), dynamic light scattering (DLS), and magnetic measurements.
View Article and Find Full Text PDFSensitive and accurate photoluminescent-multiphonon resonant Raman scattering dual-mode detection of microRNA-21 via catalytic hairpin assembly amplification and magnetic assistance.
Mikrochim Acta
January 2025
Key Laboratory of UV-Emitting Materials and Technology (Northeast Normal University), Ministry of Education, Changchun, 130024, P. R. China.
A novel dual-mode detection method for microRNA-21 was developed. Photoluminescent (PL) and multiphonon resonant Raman scattering (MRRS) techniques were combined by using ZnTe nanoparticles as signal probes for reliable detection. The catalytic hairpin assembly (CHA) strategy was integrated with superparamagnetic FeO nanoparticle clusters (NCs) to enhance sensitivity.
View Article and Find Full Text PDFDevelopment and assessment of a novel magnetic nanoparticle antibody-conjugate and aptamer-based assay (MNp-Ab-Ap assay) for the rapid diagnosis of pleural tuberculosis.
Nanotheranostics
January 2025
Translational Research Laboratory, Department of Experimental Medicine and Biotechnology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India.
Article Synopsis
- Pleural tuberculosis (pTB) is hard to diagnose due to vague symptoms and limited testing options, prompting the development of a new assay using magnetic nanoparticles and antibodies to detect specific antigens related to the disease.
- The MNp-Ab-Ap assay was created by attaching antibodies to magnetic nanoparticles, enabling the capture of pTB antigens from pleural fluid, which were then identified using specialized aptamers.
- In testing, the MPT51-based variant of the assay showed a sensitivity of 66.6% and a high specificity of 95.4%, proving to be more effective than existing methods like the Xpert MTB/RIF test, suggesting it could significantly improve pTB diagnosis.
Medium molecular weight chitosan and magnetite based bead as a nanocomposite for delivery of anticancer drug: Development, evaluation and biocompatibility study.
Int J Biol Macromol
December 2024
Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India. Electronic address:
Article Synopsis
- The study focuses on using magnetic nanoparticles (MNP) combined with chitosan to improve targeted drug delivery for breast cancer treatment, aiming for better efficacy and fewer side effects.
- MNPs were created through a co-precipitation method, and then encapsulated with the anti-cancer drug 5-fluorouracil (5-FU) in chitosan beads, followed by a variety of characterization techniques to confirm their properties.
- Results indicated a high entrapment efficiency of 85-90% and notable cytotoxic effects on breast cancer cells, with drug release varying under different pH levels, suggesting a promising strategy for targeted cancer therapy.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!