Efficient removal of As(V) from simulated arsenic‐contaminated wastewater via a novel metal–organic framework material: Synthesis, structure, and response surface methodology

A novel metal–organic framework material {[N(C2H5)3][Zn2(ptmda)2(μ2‐H2O)]·(H2O)0.5}n {GUT‐3; H2ptmda is 4,4′‐([p‐tolylazanediyl]bis [methylene])dibenzoic acid} was successfully synthesized using the hydrothermal method and characterized by X‐ray diffraction, Fourier transform infrared spectroscopy, and X‐ray photoelectron spectroscopy. GUT‐3 has a two‐dimensional network based on dinuclear [Zn2(ptmda)2(μ2‐H2O)]− building units which formed an eightfold interpenetration network in GUT‐3 molecules. Hirshfeld surface analysis revealed that H–H, C–H, and O–H bonds accounted for the majority of intermolecular interactions. Moreover, the interactions between GUT‐3 and As(V) – the form of As(V) is AsO43− – were analyzed in aqueous solutions in a batch system to study the effect of pH, concentration, adsorbent dose, adsorption time, adsorption temperature, and shaking speed. The kinetic and isotherm data of arsenic adsorption on GUT‐3 were accurately modeled by pseudo‐second‐order, Langmuir (qm = 33.91 mg/g), and Freundlich models. The Box–Behnken response surface method was used to optimize the adsorption conditions of As(V) from the simulated arsenic‐contaminated wastewater. The effect of various experimental parameters and optimal experimental conditions was ascertained using the quadratic model. The novel metal–organic framework material synthesized, GUT‐3, which formed an eightfold interpenetration network, can remove As(V) from simulated arsenic‐contaminated wastewater. The maximum adsorption capacity of GUT‐3 was 33.91 mg/g and the removal efficiency of As(V) was 98.51%.