مشخصات پژوهش

خانه /Photocatalytic activity of ...
عنوان
Photocatalytic activity of new nanostructures of an Ag( i ) metal–organic framework (Ag-MOF) for the efficient degradation of MCPA and 2,4-D herbicides under sunlight irradiation
نوع پژوهش مقالات در نشریات
کلیدواژه‌ها
MOF; Ag; Photocatalyst;
چکیده
A new Ag(I) metal–organic framework (Ag-MOF) [Ag(p-OH-C6H4COOH)2(NO3)]n [Ag(PHBA)2(NO3)]n, (1) (PHBA: C8H6O4{p-hydroxybenzoic acid}) was synthesized using two different methods; the laying method (single crystal) and sonochemical irradiation (nanostructures). Scanning electron microscopy (SEM), powder XRD, and FT-IR spectroscopy were used to characterize the materials. The impacts of various parameters, including the ultrasonic (US) power, reaction time, reactant concentration, and temperature requirements to reach a controlled synthesis were extensively investigated. Compound 1-5 (obtained via sonochemical irradiation) showed an excellent catalytic activity towards simultaneous photodegradation of 2-methyl-4-chlorophenoxyacetic acid (MCPA) and 2,4-dichlorophenoxyacetic acid (2,4-D) in an aqueous solution under sunlight irradiation. The response surface methodology (RSM) for the modelization and optimization of the photodegradation of the MCPA/2,4-D mixture was utilized. The maximum photodegradation efficiencies for 2,4-D and MCPA (96.0 and 98.0% respectively) were observed under optimal conditions of C0 = 4.5 mg L−1, catalyst dose = 0.4 g L−1, pH = 5.5 and irradiation time = 20 min. The determined quantum yield of Ag-MOF was 3.21 × 10−5 molecules per photon with excellent reusability in terms of the degradation efficiency (e.g., 97% for the first cycle and 86% for the fifth). Ag-MOF is suggested for the efficient treatment of organic pollutants in wastewater systems.
پژوهشگران پیام حیاتی (نفر اول)، زهره مهرآبادی (نفر دوم)، مهدی کریمی (نفر سوم)، جان جانزک (نفر چهارم)، خسرو محمدی (نفر پنجم)، قدرت محمودی (نفر ششم به بعد)، فاطمه دادی (نفر ششم به بعد)، محمدجعفر سلطانیان فرد (نفر ششم به بعد)، امیر حسن زاده (نفر ششم به بعد)، صادق رستم نیا (نفر ششم به بعد)