Conducting polyaniline nanotubes with silver nanoparticles in the separation of thiocyanate from aqueous media
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ORIGINAL PAPER
Conducting polyaniline nanotubes with silver nanoparticles in the separation of thiocyanate from aqueous media Sawsan Zaghlol1 · Mohamad Ayad1,2 · Jaroslav Stejskal3 Received: 27 July 2020 / Accepted: 15 October 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract Thiocyanate anions represent serious environmental hazards and the ways for their extraction from ecosystem are sought. In the testing of new adsorbents, polyaniline nanotubes have been utilized as a host polymer in which silver nanoparticles were distributed to produce polyaniline nanotubes/silver nanocomposite. The interaction of thiocyanate anions in aqueous medium with the nanocomposite deposited on the quartz-crystal microbalance was studied. The results indicated that polyaniline nanotubes adsorb thiocyanate anions, and silver nanoparticles are suspected in addition to catalyze the transformation of thiocyanate. The extraction of thiocyanate anions using nanocomposites from the aqueous solution was then monitored with the UV–visible spectroscopy. The effect of different parameters including concentration, adsorbent dose, and pH has been mentioned. The pH effect demonstrated that ion exchange and electrostatic interaction as well as chemisorption mechanisms are involved in the adsorption. The results were fitted into various kinetic models. It was concluded that pseudo-second-order kinetic model best matched the adsorption and the extraction capacity of thiocyanate anions, 112 mg g−1, exceeds the results reported so far in the literature. In addition, the results showed that the separation of S CN− depends on a synergetic effect of interaction and reduction of SCN− with polyaniline nanotubes/silver nanocomposite. Keywords Polyaniline nanotubes · Polyaniline/silver nanocomposite · Thiocyanate · Adsorption isotherms · Adsorption kinetics · Water-pollution treatment
Introduction Environmental pollution is increasing due to the progressing industrialization and urbanization (Bavasso et al. 2016; Chinh et al. 2018). The need to reduce it particularly in waste-water streams of hydrometallurgical and other industries becomes an important issue (Di Palma et al. 2018; Stoller et al. 2016). Among the environmental pollutions, thiocyanate anions, S CN−, have gained relatively more significance due to their environmental toxicity (Watts and Moreau 2018). These anions are involved in different * Jaroslav Stejskal [email protected] 1
Department of Chemistry, Faculty of Science, University of Tanta, Tanta, Egypt
2
Basic and Applied Sciences School, Egypt-Japan University of Science and Technology, Borg El Arab 21934, Alexandria, Egypt
3
Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic
industrial processes that include a coal coking, printing, hydrometallurgy, dyes synthesis, acrylic fiber preparation, flame-retarding, electroplating, and photofinishing (Kurashova et al. 2018; Leroux et al. 2007; Wang and Zhao 2019; Yin et al. 2015). The toxi
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