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Facile synthesis, growth process, characterisation of a nanourchin-structured α-MnO 2 and their application on ultrasonic-assisted adsorptive removal of cationic dyes: A half-life and half-capacity concentration approach
Ist Teil von
Ultrasonics sonochemistry, 2018-12, Vol.49, p.175
Ort / Verlag
Netherlands
Erscheinungsjahr
2018
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Textile dyes pose a serious threat in terms of water pollution due to its complex aromatic structures and poor degradability. In order to reduce the toxic effects of Crystal Violet (CV) and Methylene Blue (MB), an ultrasonic-assisted dye adsorption using urchin like α-MnO
nanostructures was studied. The adsorbent was synthesised by hydrothermal method at low-temperature. The crystallinity and morphology were determined to investigate the growth mechanism of α-MnO
nanourchins which consists of two main stages. The initial stage includes the formation of α-MnO
microspheres followed by the epitaxial growth of nanoneedles on to the surface of them. The α-MnO
was characterised by BET, XRD, FT-IR, XPS, SEM, TEM and TGA. At 5.6, the point of zero charge of α-MnO
nanostructures was determined. The total pore volume and average pore radius were confirmed to be 4.751 × 10
cc/g and 10.99 Å respectively from the BET analysis. Batch adsorption experiments were performed to investigate the effect of pH, adsorbent dosage, sonication time, initial dye concentration, temperature, ultrasonic frequency and power. The adsorption mechanism was studied using several isotherm and kinetic models. The adsorption data of CV and MB at equilibrium was observed to adopt the Langmuir isotherm model and pseudo-second order kinetic model. The maximum adsorption capacities for CV and MB were found to be 5882.3 and 5000 mg/g respectively. The thermodynamic study predicted that the process was exothermic for CV and endothermic for MB. The effects of competitive ions, ionic strength and humic acid on the uptake of both the dyes were also investigated. And finally, the reusability of recovered α-MnO
after dye adsorption was studied up to five cycles for its potential industrial applications.
Sprache
Englisch
Identifikatoren
eISSN: 1873-2828
Titel-ID: cdi_pubmed_primary_30146468
Format
–
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