Heterogeneous Photo-Fenton Catalytic Degradation of Practical Pharmaceutical Wastewater by Modified Attapulgite Supported Multi-Metal Oxides

Abstract

Chemical synthetic pharmaceutical wastewater has characteristics of high concentration, high toxicity and poor biodegradability, so it is difficult to directly biodegrade. We used acid modified attapulgite (ATP) supported Fe-Mn-Cu polymetallic oxide as catalyst for multi-phase Fenton-like ultraviolet photocatalytic oxidation (photo-Fenton) treatment with actual chemical synthetic pharmaceutical wastewater as the treatment object. The results showed that at the initial pH of 2.0, light distance of 20 cm, and catalyst dosage and hydrogen peroxide concentration of 10.0 g/L and 0.5 mol/L respectively, the COD removal rate of wastewater reached 65% and BOD5/COD increased to 0.387 when the reaction lasted for 180 min. The results of gas chromatography-mass spectrometry (GC-MS) indicated that Fenton-like reaction with Fe-Mn-Cu@ATP had good catalytic potential and significant synergistic effect, and could remove almost all heterocycle compounds well. 3D-EEM (3D electron microscope) fluorescence spectra showed that the fluorescence intensity decreased significantly during catalytic degradation, and the UV humus-like and fulvic acid were effectively removed. The degradation efficiency of the nanocomposite only decreased by 5.8% after repeated use for 6 cycles. It seems appropriate to use this process as a pre-treatment for actual pharmaceutical wastewater to facilitate further biological treatment.

Pd-Based Nanoparticles as Catalysts for Improved Removal of Florfenicol via Heterogeneous Fenton and Photo-Fenton(-like) Processes

“…Superoxide radicals could be generated instead of hydroxyl radicals, the former being less oxidizing than the latter. 59 Furthermore, the scavenging effect, associated with the surface reaction between the • OH and Ni(II) and Fe(II) present in the nanoparticles, consume • OH radicals (eqs 6 and 7), and reducing the degradation capacity too 60 OH Fe OH Fe 2 3…”

Gliding arc plasma treatment of levofloxacin using experimental design approach

“…[13,14] However, these processes have the drawback of removing and transferring the pollutant from one phase to another, which involves a posttreatment step. Since the high cost of solvents and reagents limits the performance and efficiency of conventional chemical processes, advanced oxidation processes (AOPs) are increasingly used to degrade and mineralize recalcitrant pharmaceutical pollutants by forming, in-situ, strong oxidizing species including hydroxyl radicals OH • such as ozonation, [15][16][17] UV/H 2 O 2 processes, [18][19][20] photocatalytic degradation processes, [21][22][23] Fenton and photo-Fenton processes, [24][25][26] plasma processes, etc. [27][28][29][30] Several studies have used response surface methodology (RSM) to investigate the influence of operating parameters and determine the optimal conditions of pharmaceutical pollutants degradation by AOPs.…”

Water Remediation from Recalcitrant Pollution Using the Galvano-Fenton Process: A Modeling Approach of the Hydroxyl Radical Generation and the Energy Efficiency

“…Fenton based techniques such as photo-Fenton or electro-Fenton for the treatment of wastewater were studied by several scientists such as Martins et al (Martins et al 2006), Tarkwa et al (Tarkwa et al 2019), and more recently, Lu et al (Lu et al 2021). These techniques use additional energy and/or chemicals to generate highly oxidizing agents, mainly hydroxyl radicals.…”