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      Current advances in treatment technologies for removal of emerging contaminants from water – A critical review

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      Coordination Chemistry Reviews
      Elsevier BV

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          Tackling antibiotic resistance: the environmental framework.

          Antibiotic resistance is a threat to human and animal health worldwide, and key measures are required to reduce the risks posed by antibiotic resistance genes that occur in the environment. These measures include the identification of critical points of control, the development of reliable surveillance and risk assessment procedures, and the implementation of technological solutions that can prevent environmental contamination with antibiotic resistant bacteria and genes. In this Opinion article, we discuss the main knowledge gaps, the future research needs and the policy and management options that should be prioritized to tackle antibiotic resistance in the environment.
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            Review of iron-free Fenton-like systems for activating H2O2 in advanced oxidation processes.

            Iron-catalyzed hydrogen peroxide decomposition for in situ generation of hydroxyl radicals (HO(•)) has been extensively developed as advanced oxidation processes (AOPs) for environmental applications. A variety of catalytic iron species constituting metal salts (in Fe(2+) or Fe(3+) form), metal oxides (e.g., Fe2O3, Fe3O4), and zero-valent metal (Fe(0)) have been exploited for chemical (classical Fenton), photochemical (photo-Fenton) and electrochemical (electro-Fenton) degradation pathways. However, the requirement of strict acidic conditions to prevent iron precipitation still remains the bottleneck for iron-based AOPs. In this article, we present a thorough review of alternative non-iron Fenton catalysts and their reactivity towards hydrogen peroxide activation. Elements with multiple redox states (like chromium, cerium, copper, cobalt, manganese and ruthenium) all directly decompose H2O2 into HO(•) through conventional Fenton-like pathways. The in situ formation of H2O2 and decomposition into HO(•) can be also achieved using electron transfer mechanism in zero-valent aluminum/O2 system. Although these Fenton systems (except aluminum) work efficiently even at neutral pH, the H2O2 activation mechanism is very specific to the nature of the catalyst and critically depends on its composition. This review describes in detail the complex mechanisms and emphasizes on practical limitations influencing their environmental applications.
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              Pharmaceuticals and personal care products (PPCPs) in the freshwater aquatic environment

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                Author and article information

                Contributors
                (View ORCID Profile)
                Journal
                Coordination Chemistry Reviews
                Coordination Chemistry Reviews
                Elsevier BV
                00108545
                September 2021
                September 2021
                : 442
                : 213993
                Article
                10.1016/j.ccr.2021.213993
                bb6f815a-37a0-475d-b04e-0691940bd59f
                © 2021

                https://www.elsevier.com/tdm/userlicense/1.0/

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