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Hydrothermal synthesis of needle-shaped manganese oxide nanoparticle for superior adsorption of thallium(I): characterization, performance, and mechanism study
- Source :
- Environmental Science and Pollution Research. 26:36776-36785
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
Abstract
- Thallium as a highly toxic metal element has been listed as one of priority drinking water contaminants. In this study, manganese oxide nanoparticles were synthesized through a simple hydrothermal method and applied for the removal of thallium(I). The adsorbent was composed of numerous needle-like nanorods and had an average volume diameter of 230 nm after heat-drying procedure. The crystal form of adsorbent was determined as α-MnO2. The adsorbent exhibited a much faster adsorption rate than most of previously reported adsorbent, achieving over 66.4% of equilibrium adsorption capacity in the first 10 min. The adsorption process was found to be highly affected by solution pH and higher than 100 mg/g of adsorption capacity could be obtained in a wide pH range of 6.0-10.0. The isotherm study indicated that the adsorption of Tl(I) on the adsorbent was favorable and governed by a chemisorption process, with the maximum adsorption capacity of 505.5 mg/g at pH 7.0. The adsorption process was confirmed to be thermodynamically spontaneous and endothermic. The presence of Na+, K+, Mg2+, Ca2+, and Cu2+ cations had certain negative effects on the uptake of Tl(I). Based on the batch experiments and XPS analysis, the deprotonated hydroxyl groups that bonded to manganese atoms worked as the binding sites for the effective removal of Tl(I) ions and no redox reaction occurred during the adsorption process.
- Subjects :
- Health, Toxicology and Mutagenesis
Inorganic chemistry
chemistry.chemical_element
Manganese
010501 environmental sciences
01 natural sciences
Endothermic process
Redox
Water Purification
Adsorption
Environmental Chemistry
Hydrothermal synthesis
Thallium
0105 earth and related environmental sciences
Magnesium
Oxides
General Medicine
Hydrogen-Ion Concentration
Pollution
Kinetics
Manganese Compounds
chemistry
Chemisorption
Nanoparticles
Thermodynamics
Oxidation-Reduction
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 16147499 and 09441344
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Environmental Science and Pollution Research
- Accession number :
- edsair.doi.dedup.....5a976688a5048789e2f33abe81d291be