Potential applicability of Zn0.05TiOxNy@MOF-5 nanocomposite for adsorption and electrochemical detection of Zn(II) in saline wastewater. Issue 5 (October 2021)

• Record Type: Journal Article
• Authors: Younis, Sherif A.; Ali, Tamer Awad; Serp, Philippe
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 5(2021)
• Publication Date: 2021-10
• Subjects: AAS Atomic absorption spectroscopy -- AFM Atomic force microscope -- BDC Benzene-1, 4-dicarboxylic acid -- Df Film diffusion coefficients (cm3/s) -- Dp Pore diffusion coefficient (cm3/s) -- DW Dumwald-Wagner model -- FD Film diffusion model -- F-value Fisher's F-test -- ho Initial adsorption rate (g/mg min) -- IEC Ion-exchange chromatography -- IPD Intra-particle diffusion model -- ISEs Ion-selective electrodes -- KZnII, Xpot Potentiometric selectivity coefficient -- K-W Kruskal-Wallis test -- MLF Langmuir-Freundlich model -- MOE Mixed first and second-order kinetic model -- MOFs Metal-organic frameworks -- MSM Mixed-solution method -- M-SR-DC Mixed surface reaction and diffusion-controlled kinetic model -- PFO Pseudo-first-order kinetic model -- PSO Pseudo-second-order kinetic model -- p-value Probability level -- Qmax Maximum adsorption capacity (mg/g) -- RSD% Relative standard deviation -- SD Standard deviation -- SEM Scan electron microscope -- SPSs Screen-printed sensors -- SSM Separate solution method -- TDS Total dissolved solids (g/L) -- t-value Student's t-test -- XRD X-ray diffraction; ZnTiO2-oxynitride -- MOF-5 -- Modified screen-printed sensors -- Potentiometric sensing -- Zinc contaminated saline wastewater -- Adsorption studies; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106186
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Recent developments in metal-organic frameworks (MOFs) have gained great interest in the potentiometric sensing and adsorption removal of heavy metals. However, poor hydrochemical stability is the major challenge limiting MOFs (e.g., MOF-5) applicability in the real environmental field. Accordingly, the impregnation of MOF-5 with Zn0.05 TiOx Ny nanoparticles was proposed in this work to design a hydrochemical stable Zn0.05 TiOx Ny @MOF-5 nanocomposite for selective/sensitive adsorption and potentiometric sensing of Zn 2+ ions in saline wastewater containing 10–140 g L -1 total dissolved solids (TDS). The results indicate that Zn0.05 TiOx Ny @MOF-5 outperformed MOF-5 for Zn 2+ adsorption over five reuse cycles, with an initial uptake rate ( h o ) of 11.724 g mg -1 min -1 at 50 g L -1 TDS. Based on the kinetic, isotherm, and thermodynamic data, the adsorption of Zn 2+ onto Zn0.05 TiOx Ny @MOF-5 is an endothermic and physisorption in nature (ΔHº = −12.02 kJ/mol), including electrostatic interaction and diffusion mechanisms as the main rate-limiting step. The modified screen-printed sensor (SPS) with Zn0.05 TiOx Ny @MOF-5 ionophore also exhibits good selectivity for Zn 2+ sensing (detection limit (DL) of 2.1 × 10 -8 mol L -1 = 0.0014mg L -1 ) over a wide working range of 10 -1 to 10 -8 mol L -1 (Nernstian slope = 29.7 ± 0.3 mV decade -1 ) and pH 3–9. At optimum pH 5, the practical usability of SPS-based Zn0.05 TiOx Ny @MOF-5 for Zn 2+ detection was also recognized in real petroleum and sewage wastewaters with stable potentiometric response over six successive days. These findings concluded that Zn0.05 TiOx Ny @MOF-5 could be used as a promising adsorbent and ionophore for selective adsorption and potentiometric detection of Zn 2+ ions at a real environmental scale. Graphical Abstract: ga1 Highlights: A hybrid Zn0.05 TiOx Ny @MOF-5 nanocomposite was synthesized by a microwave solvothermal method. Zn0.05 TiOx Ny @MOF-5 outperformed MOF-5 for Zn 2+ adsorption in saline wastewater up to 5 reuse cycles. The electrostatic and pore-diffusion mechanisms are the main rate-controlling Zn 2+ adsorption process. A modified screen-printed sensor (SPS) was fabricated using Zn0.05 TiOx Ny @MOF-5 ionophore. The modified SPS-electrode exhibited high selectivity and sensitivity for Zn 2+ detection in petroleum and sewage wastewater.