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Advisor(s)
Abstract(s)
The combined approach of specific surface area (SSA), porosity, microprobe analysis (EMPA),
transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with
EDX and infrared spectroscopy (FTIR) provided the mica mineral physico-chemical and
morphological characterisation. The electrostatic surface properties were assessed through the
determination of the Point of Zero Charge (pHPZC) by the drift method and the electrokinetic
mica mineral features represented by the Isoelectric Point (pHIEP) which was carried out through
zeta potential measurements. Adsorption tests were performed to correlate the surface charge
behaviour of the mica mineral and its influence on the adsorption efficiency of two different
dyes, namely: Safranin Orange (SO), as a cationic dye and Reactive Black 5 (RB5), as an anionic
dye. The higher adsorption capacity SO dye was observed at pH 9 and achieved almost 83% of
removal, while RB5 dye adsorption on mica surface had the highest result, about 45% of
removal efficiency, on pH of 3. In both cases, the main mechanism identified that drove this
results is the electrostatic force of attraction between the adsorbent edge surface charge (pHdependent)
and the ionic nature (anionic or cationic) of the pollutant dyes particles. The
preliminary adsorption experiments demonstrated that the raw grounded mica mineral has a
greater potential associated with its application on cationic dye removal in wastewater. The
present study aimed to detail the main characteristics of the mica mineral in order to evaluate
the potential use of such mineral residues in the removal efficiency of contaminated wastewater
Description
Keywords
mica mineral electrostatic properties adsorption Safranin Orange Reactive Black 5
Pedagogical Context
Citation
Anna Carla Ribeiro, Murilo Barbosa de Andrade, Heloise Beatriz Quesada, Laiza Bergamasco Beltran, Rosângela Bergamasco, Maria Madalena Calado Santos Sobral da Fonseca & Elizabeth da Costa Neves Fernandes de Almeida Duarte (2021): Physicochemical and electrostatic surface characterisation of mica mineral and its applicability on the adsorption of Safranin Orange and Reactive Black 5 dyes, Environmental Technology
Publisher
Taylor & Francis