Raw UV-Vis Spectroscopy Data for Methylene Blue Degradation Using MOF/ZnO Composite Membranes
Description
This dataset contains the raw UV-Vis spectrophotometry data evaluating the photocatalytic degradation efficiency of Methylene Blue (MB) dye. The experiments were conducted using a newly developed triple-action MOF/ZnO composite membrane system designed for advanced water purification. The dataset is structured to support the findings presented in the associated research manuscript, specifically demonstrating a maximum dye degradation efficiency of 98.50%. Data Structure & Content: - The data files provide comprehensive absorbance profiles recorded at regular time intervals during the photocatalytic reaction. - Measurements track the decrease in the characteristic absorption peak of Methylene Blue (typically around 664 nm) over the course of the filtration and degradation process. - The dataset is categorized into four distinct experimental batches: Group A (Control/Baseline), Group B, Group C, and Group D (Optimized Composite Formulation). Potential Applications: This raw data is highly valuable for researchers interested in: 1. Replicating or verifying the photocatalytic kinetics of MOF/ZnO-based materials. 2. Conducting comparative studies on membrane fouling and self-cleaning efficiency under light irradiation. 3. Exploring alternative kinetic models (e.g., pseudo-first-order degradation models) using the provided time-resolved absorbance values.
Files
Steps to reproduce
Step 1: Reagent and Solution Preparation - Prepare a stock solution of Methylene Blue (MB) dye at a target initial concentration using deionized water to simulate organic wastewater. - Prepare the four distinct membrane configurations: Group A (neat/control membrane), Group B, Group C, and Group D (optimized triple-action MOF/ZnO composite membrane). Step 2: Photocatalytic Filtration Setup - Mount the membrane specimen into a customized cross-flow or dead-end filtration cell equipped with an irradiation window. - Position a simulated light source (UV or visible light lamp at a fixed distance and intensity) above the filtration cell to activate the photocatalytic properties of the MOF/ZnO composite. Step 3: Sampling Timeline and Operation - Allow the system to reach adsorption-desorption equilibrium in the dark for a designated period before turning on the light source. - Initiate the filtration process under a constant operating pressure. - Collect permeate aliquots (approximately 2–3 mL per sample) at regular time intervals (e.g., every 5, 10, or 15 minutes) over the total duration of the experiment. Step 4: UV-Vis Spectrophotometric Measurement - Calibrate the Thermo Scientific GENESYS 150 UV-Vis Spectrophotometer (USA) using deionized water as a blank baseline to establish a stable reference. - Pour each collected sample into a standard 10-mm path length quartz cuvette. - Scan the absorbance spectrum within the wavelength range of 400-800 nm using the instrument's automated scanning function, focusing specifically on the maximum absorption wavelength of Methylene Blue at approximately 664 nm. - Record the maximum absorbance values for each time interval across all experimental groups (A, B, C, and D) using the integrated local control software or connected PC workstation. Step 5: Data Processing and Analysis - Compile the raw absorbance values into a structured spreadsheet format (e.g., CSV or Excel). - Calculate the dye degradation efficiency using the formula: Efficiency (%) = [(A0 - At) / A0] x 100, where A0 is the initial absorbance at t = 0 and At is the absorbance at time t. - Perform statistical evaluations (e.g., One-Way ANOVA) using statistical software (such as R or OriginLab) to validate the significance of the degradation rates.