A Fast Adsorption of Azithromycin on Waste-Product-Derived Graphene Oxide Induced by H-Bonding and Electrostatic Interactions

Abstract

Graphene oxide (GO) was prepared from the graphite electrode of waste dry cells, and the application of the prepared GO as a potential adsorbent for rapid and effective removal of an antibiotic, azithromycin (AZM), has been investigated. The synthesis process of GO is very simple, cost-effective, and eco-friendly. As-prepared GO is characterized by field-emission scanning electron microscopy, energy-dispersive X-ray, transmission electron microscopy, X-ray diffractometry, Fourier transform infrared spectroscopy, elemental analysis, Brunauer–Emmett–Teller sorptometry, and zeta potential analysis. The obtained GO has been employed for removal of the widely used AZM antibiotic from an aqueous solution. The quantitative analysis of AZM before and after adsorption has been carried out by liquid chromatography tandem mass spectrometry. The adsorption of AZM by GO was performed in a batch of experiments where the effects of adsorbent (GO) dose, solution pH, temperature, and contact time were investigated. Under optimum conditions (pH = 7.0, contact time = 15 min, and adsorbent dose = 0.25 g/L), 98.8% AZM was removed from the aqueous solution. The rapid and effective removal of AZM was significantly controlled by the electrostatic attractions and hydrogen bonding on the surface of GO. Adsorption isotherms of AZM onto GO were fitted well with the Freundlich isotherm model, while the kinetic data were fitted perfectly with the pseudo-second order. Therefore, the simple, cost-effective, and eco-friendly synthesis of GO from waste material could be applicable to fabricate an effective and promising low-cost adsorbent for removal of AZM from aqueous media.

Magnetic NH2-MIL-101(Al)/Chitosan nanocomposite as a novel adsorbent for the removal of azithromycin: modeling and process optimization

“…Figure 6 shows possible adsorption interactions between AZM and MIL/Cs@Fe 3 O 4 NCs. Since there is no π-electron in AZM, it is unlikely to have π–π interactions with MIL/Cs@Fe 3 O 4 NCs 65 . Based on the evidence, adsorption may occur as a result of cationic and anionic electrostatic interactions and H-bonding between AZM and MIL/Cs@Fe 3 O 4 NCs.…”

The Effect of Reducing Agent for Synthesizing Palladium Nanoparticle on Carbon Nanotube Support and Its Superior Catalytic Activity towards Methanol Oxidation Reaction

“…The diffraction peak at 2θ = 25°for all catalysts corresponds to the C (002) reflection of carbon. 11,[17][18][19][20] The other four peaks at 2θ = 40.07, 46.59, 68.14 and 82.27°are assigned to the (111), ( 200), (220) and (311) which are the reflection of the face-centered-cubic (fcc) crystalline structure of palladium and have similarities with SAED pattern. 21,22 Furthermore, the width of the Pd (111) diffraction peak of the CNT-Pd (SBH) catalyst is more widener than that of the other catalyst indicating small sized Pd NPs dispersed on CNT because it is well known that the peak width is inversely proportional to the particle size (Scherrer equation).…”

Electrochemically Reduced Graphene Oxide Supported Palladium-Cobalt Alloy Nanoparticles as Highly Efficient Electrocatalyst for Oxygen Reduction Reaction

“…3, the diffraction peak at 2θ = 25 o corresponds to the C (002) reflection of ErGO. 9,37 The other four peaks at 2θ = 40.07, 46.59, 68.14 and 82.27 are assigned to the (111), ( 200), (220), and (311), which are the reflections of the face-centered-cubic (fcc) crystalline structure. 6,38,39 As can be seen in inset Fig.…”

“…It possesses some unique properties, including a large surface area (2630 m 2 g −1 ), which intensifies nanocrystal dispersion on the graphene sheet with a good population, as well as mechanical, thermal, and electrical properties. [22][23][24] In this work, we have reported the synthesis of low-cost, highperformance, and long-lasting Pd-Co nanoparticles on graphene (ErGO/Pd-Co) for a highly efficient ORR catalyst in FCs. The first step in the process was to create reduced graphene oxide-supported Pd-Co (rGO/Pd-Co) using a straightforward chemical reduction technique.…”