Original Research PaperAgO/MgO/FeO@Si3N4 nanocomposite with robust adsorption capacity for tetracycline antibiotic removal from aqueous system
Graphical abstract
Introduction
Water pollution due to antibiotics has been quite alarming due to their persistent and non- biodegradable nature. These are not completely absorbed by the human bodies due to which they are indirectly released into the water through urine or faeces. Herein, one of the most commonly utilized antibiotics, tetracycline (TC) has been considered as the model pollutant [1], [2]. TC has been known to exhibit antimicrobial activity against numerous pathogenic bacteria. Its presence in water not only suppresses the water quality but also arose the issues regarding water purification [3]. Also, prolonged exposure of TC to microorganisms could also result in their resistance against TC, thus its removal from the water system is of immense importance [4].
Purification of contaminated water can be achieved by using a variety of methods including coagulation, flocculation, photocatalysis [5], [6], [7], [8], [9], [10], membrane filtration [11], [12], ozonation, reverse osmosis, adsorption and ion exchange [13], [14], [15], [16], [17]. The remediation method is decided based on pollutants and in the present study, adsorption has been employed for the TC removal from aqueous solution. This technique offers major perks over other techniques such as its applicability at any concentration, lower cost of operation, design ease and no production of toxic by-products at the end of experiments [18], [19]. In the initial times, activated carbon was the best adsorbent for various pollutants but due to difficulty in its separation and regeneration led to the emergence of several new adsorbents. Numerous data has been published in the literature on TC adsorption such as Zhou and his co- workers synthesized ferroferric oxide nanoparticles assisted powdered activated carbon for the adsorption of TC molecules and found the chemisorption behavior [20]. Abadi et al., synthesized Fe- doped zeolite for TC adsorption and reported that the interactions were pH-dependent due to the amphoteric behavior of TC [21].
In the present study, a trimetallic nanocomposite of AgO/MgO/FeO@Si3N4 has been synthesized for the removal of TC from aqueous solution. Metal oxides are quite effective adsorbents for the removal of various pollutants from aqueous solutions [22]. Enough literature is available about the use of silver oxide, iron oxide and magnesium oxide as adsorbent [23], [24], [25]. These oxides exhibit better magnetic and chemical properties. In one of our previous study, we synthesized La/Cu/Zr trimetallic nanoparticles (TNPs) and utilized its catalytic activity for the removal of ampicillin from aqueous solution [26]. Some other reported work in this field includes the Sr0.3Mg0.7Fe2O4 nanocubes that were designed as a selective nanoadsorbent for congo red dye. Around 90% dye was adsorbed within just 30 min [27]. In other study, Fe0-based trimetallic system was designed for the elimination of aqueous diclofenac [28].
The trimetallic oxides were imprinted onto the matrix of silicon nitride (Si3N4). It offers high mechanical and thermal properties and also help in avoiding the leaching of dispersed metal oxides. It provides mechanical strength at high temperatures, ascertaining the stability under extreme conditions [29]. Main objectives of the present study were (i) to synthesize Si3N4; (ii) to synthesize AgO/MgO/FeO@Si3N4 nanocomposite; (iii) to characterize the synthesized composite by FTIR, SEM, XRD, TEM, XPS and BET; (iv) adsorption of TC from aqueous solution onto AgO/MgO/FeO@Si3N4 nanocomposite and (v) reusability of AgO/MgO/FeO@Si3N4 nanocomposite.
Section snippets
Chemicals
All the chemicals were of analytical grade and used as received. Trisodium citrate (Na3C6H5O7), silver nitrate (AgNO3), magnesium nitrate (Mg(NO3)2), ferric nitrate (Fe(NO3)3), silica (SiO2) and urea (NH2CONH2) were all purchased from Central Drug House Pvt. Ltd. (CDH), Solan, H.P., India. Tetracycline hydrochloride (C22H24N2O8. HCl) was obtained from Loba Chemie Pvt. Ltd., Solan H.P., India.
Synthesis of Si3N4 and AgO/MgO/FeO@Si3N4 nanocomposite
Si3N4 was prepared by pyrolysis as reported in our previous work [30] and the AgO/MgO/FeO@Si3N4
Synthesis of AgO/MgO/FeO@Si3N4 nanocomposite
The AgO/MgO/FeO@Si3N4 nanocomposite was prepared by the microwave reduction method. Trisodium citrate (Na3C6H5O7) was used as the reducing agent that shows its activity only at elevated temperature (~100 °C) which was accomplished by the microwave radiations. In addition to acting as a reducing agent, it also acts as a capping agent. Thus, it helps in reducing the further growth of formed nanoparticles and reduces the chances of agglomeration [39].
So, when metal nitrate solution mixed with
Conclusions
In summary, we synthesized AgO/MgO/FeO@Si3N4 nanocomposite by microwave reduction method. It was effectively utilized for the adsorption of TC molecules from aqueous solution. Various characterization techniques validated the successful formation of required nanocomposite and its surface properties are well presented. The pH of the solution was found to be major influencing parameter since TC behave differently in different pH solutions. Maximum adsorption capacity as obtained from Langmuir
Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgements
One of the authors (Mu. Naushad) acknowledges financial support from the Distinguished Scientist Fellowship Program (DSFP), King Saud University, Riyadh, Saudi Arabia. The authors are thankful to the Shoolni University, Solan, India for providing research facilities.
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