Nanosized Zincated Hydroxyapatite as a Promising Heterogeneous Photo-Fenton-Like Catalyst for Methylene Blue Degradation

Abstract

This study is devoted to synthesis of nanosized zincated hydroxyapatite (Zn-HA) and its utilization as a heterogeneous photo-Fenton-like catalyst for degradation of methylene blue (MB) in aqueous solution. The prepared catalyst was characterized by various techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray, and Fourier transform infrared spectroscopy. The catalytic activity of Zn-HA towards MB and the effects of various experimental factors such as pH, zinc substitution degrees, initial MB concentration, and H2O2 dosage were studied in detail. The results showed that the zinc substitution degree of 0.4 is optimal to get the highest degradation efficiency under conditions of pH = 10, H2O2 dosage of 0.05 M, and MB concentration of 30 mg/L for a contact time of 120 min. The degradation mechanism was proposed and discussed thoroughly. Besides, the ability of long-term use for the synthesized catalyst was also evaluated.

Enhanced Heterogeneous Fenton Degradation of Organic Pollutants by CRC/Fe3O4 Catalyst at Neutral pH

“…In this study, MB was continuously degraded by the heterogeneous Fenton reaction with CRC/Fe 3 O 4 under the same conditions, and its stability was evaluated. As shown in Figure 6A , the catalytic performance of CRC/Fe 3 O 4 declined in six consecutive cycles, because of the possible loss of active sites and adsorption of by-products during MB degradation ( Doan et al, 2019 ). Importantly, after five continuous uses, the CRC/Fe 3 O 4 composite still maintained high degradation efficiency.…”

Polysaccharide Hydroxyapatite (Nano)composites and Their Biomedical Applications: An Overview of Recent Years

“…HAp can also be obtained by wet methods, such as chemical precipitation, , sol-gel process, a hydrothermal method over conventional or microwave heating and emulsion. These methods result in less agglomerated products and require simple experimental procedures .…”

Cu2O/Fe3O4/UiO-66 nanocomposite as an efficient fenton-like catalyst: Performance in organic pollutant degradation and influencing factors based machinelearning

“…Water contamination due to toxic organic compounds released from the production process and using dyes, pesticides, and antibiotics has been a severe environmental problem because water is crucial for living creatures [ [1] , [2] , [3] ]. Numerous methods like adsorption, advanced oxidation processes (AOPs, like photocatalysis, Fenton reaction), membrane filtration, osmosis, and biodegradation are used to treat organic compounds in wastewater [ [4] , [5] , [6] , [7] , [8] , [9] ]. Among them, the advantage of AOPs in water treatment is that the reactants are relatively cheap, readily available, non-toxic, and easy to use [ 10 ].…”