Wastewater Treatment by Catalytic Wet Peroxidation Using Nano Gold-Based Catalysts: A Review

Abstract

Nowadays, there is an increasing interest in the development of promising, efficient, and environmentally friendly wastewater treatment technologies. Among them are the advanced oxidation processes (AOPs), in particular, catalytic wet peroxidation (CWPO), assisted or not by radiation. One of the challenges for the industrial application of this process is the development of stable and efficient catalysts, without leaching of the metal to the aqueous phase during the treatment. Gold catalysts, in particular, have attracted much attention from researchers because they show these characteristics. Recently, numerous studies have been reported in the literature regarding the preparation of gold catalysts supported on various supports and testing their catalytic performance in the treatment of real wastewaters or model pollutants by CWPO. This review summarizes this research; the properties of such catalysts and their expected effects on the overall efficiency of the CWPO process, together with a description of the effect of operational variables (such as pH, temperature, oxidant concentration, catalyst, and gold content). In addition, an overview is given of the main technical issues of this process aiming at its industrial application, namely the possibility of using the catalyst in continuous flow reactors. Such considerations will provide useful information for a faster and more effective analysis and optimization of the CWPO process.

Anti-Aging and Lightening Effects of Au-Decorated Zeolite-Based Biocompatible Nanocomposites in Epidermal Delivery Systems

“…Furthermore, cytotoxicity of Au nanoparticles could be controlled by their shape, size, and densities [ 23 , 24 , 25 ]. Various deposition methods, such as vapor-phase deposition and grafting, sol–gel, and ion-exchange methods, have been developed for deposition, precipitation, co-precipitation, and impregnation [ 26 ]. Au nanoparticles are also deposited by the Turkevich method, developed by Brust et al, which induces a reaction with AuCl 4 − (using tetrachloroauric acid (HAuCl 4 )) and the reducing agent sodium borohydride in the presence of the desired ligand (thiol-terminated long-chain alkane) [ 27 , 28 ].…”

The Treatment of Nata de Coco Processing Wastewater Using Anaerobic Bio-Filter

“…Organic based on nanomaterial has obtained attention as a promising adsorbent for wastewater treatment [11] due to the low cost and large surface area to volume ratio [12]. The large surface area to volume ratio at the nano level improved the adsorption capacity and made it better adsorbing materials than conventional ones.…”

Anticancer drugs in the environment: environmental levels and technological challenges

“…These drugs inhibit the proliferation of cells that have a high dividing rate or growth, two of the characteristics of cancer cells. However, these characteristics are very general, being shared by many cell types, which means that cytostatic drugs can damage healthy cells due to their low selectivity, by blocking, for example, DNA replication through the inhibition of topoisomerase activity (Rout, Zhang, Bhunia, & Surampalli, 2021). Additionally, cytotoxic, genotoxic, mutagenic, and teratogenic effects were observed, even at low concentrations (Johnson et al, 2008;Ku ¨mmerer, Haiß, Schuster, Hein, & Ebert, 2016;Negreira, de Alda, & Barcelo ´, 2014;Novak, Žegura, Modic, Heath, & Filipič, 2017).…”

“…Upon administration, cytostatic drugs (as any chemical in general) go through a series of processes within the organism, conceptualized as adsorption, distribution, metabolism, and excretion (ADME). Nevertheless, some drugs are not metabolized and are excreted through urine, ending up in sewage (Biel-Maeso, Baena-Nogueras, Corada -Fernández, & Lara-Martı ´n, 2018;Cristo ´va ˜o et al, 2020;Dubey, Kumar, Labrou, & Shukla, 2017;Rout et al, 2021;Santana-Viera, Montesdeoca-Esponda, Sosa-Ferrera, & Santana-Rodrı ´guez, 2016). The low vapor pressure of cytostatic drugs, which prevents their volatilization, and their high solubility contribute to their widespread dispersion in water (Pruijn & DeWitte, 2004;Yadav et al, 2021).…”