Effective Poly (Cyclotriphosphazene-Co-4,4′-Sulfonyldiphenol)@rGO Sheets for Tetracycline Adsorption: Fabrication, Characterization, Adsorption Kinetics and Thermodynamics

Nanomaterials

Mohammad Mujahid Alam¹  Muhammad Imran¹  Tehseen Nawaz²  Shafqat Ali³  Yasir Abbas⁴  Shuangkun Zhang⁴  Muhammad Ahmad⁴  Zhanpeng Wu⁴ 

[1] Department of Chemistry, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia;Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China;Guangdong Provincial Key Laboratory of Soil and Ground Water Pollution Control, School of Environmental Science and Technology, Southern University of Science and Technology, Shenzhen 518055, China;State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;

关键词: reduced graphene oxide;    adsorption;    tetracycline;    thermodynamics;   

DOI  :  10.3390/nano11061540

来源: DOAJ

【 摘 要 】

The development of excellent drug adsorbents and clarifying the interaction mechanisms between adsorbents and adsorbates are greatly desired for a clean environment. Herein, we report that a reduced graphene oxide modified sheeted polyphosphazene (rGO/poly (cyclotriphosphazene-co-4,4′-sulfonyldiphenol)) defined as PZS on rGO was used to remove the tetracycline (TC) drug from an aqueous solution. Compared to PZS microspheres, the adsorption capacity of sheeted PZS@rGO exhibited a high adsorption capacity of 496 mg/g. The adsorption equilibrium data well obeyed the Langmuir isotherm model, and the kinetics isotherm was fitted to the pseudo-second-order model. Thermodynamic analysis showed that the adsorption of TC was an exothermic, spontaneous process. Furthermore, we highlighted the importance of the surface modification of PZS by the introduction of rGO, which tremendously increased the surface area necessary for high adsorption. Along with high surface area, electrostatic attractions, H-bonding, π-π stacking and Lewis acid-base interactions were involved in the high adsorption capacity of PZS@rGO. Furthermore, we also proposed the mechanism of TC adsorption via PZS@rGO.

【 授权许可】

Unknown