Mixtures of chelating agents to enhance photo-Fenton process at natural pH: Influence of wastewater matrix on micropollutant removal and bacterial inactivation

A UVA-LED driven photo-Fenton process is shown as a feasible technology for micropollutant removal. The photoreactor design, which strongly depends on the energy efficiency and LED wavelength, needs to be carried out using parameters such as Electrical-Energy-per-Order (EEO).

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Effect of residence time on micropollutant removal in WWTP secondary effluents by continuous solar photo-Fenton process in raceway pond reactors

Chemical Engineering Journal ◽

10.1016/j.cej.2017.01.089 ◽

2017 ◽

Vol 316 ◽

pp. 1114-1121 ◽

Cited By ~ 31

Author(s):

S. Arzate ◽

J.L. García Sánchez ◽

P. Soriano-Molina ◽

J.L. Casas López ◽

M.C. Campos-Mañas ◽

...

Keyword(s):

Residence Time ◽

Fenton Process ◽

Raceway Pond ◽

Micropollutant Removal ◽

Secondary Effluents

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Application of Chelating Agents to Enhance Fenton Process in Soil Remediation: A Review

Catalysts ◽

10.3390/catal11060722 ◽

2021 ◽

Vol 11 (6) ◽

pp. 722

Author(s):

Alicia Checa-Fernandez ◽

Aurora Santos ◽

Arturo Romero ◽

Carmen M. Dominguez

Keyword(s):

Soil Remediation ◽

Organic Contaminants ◽

Chelating Agents ◽

Deep Understanding ◽

Influential Factors ◽

Future Research ◽

Fenton Process ◽

Efficient Treatment ◽

Research Perspectives ◽

Application Of Cas

Persistent organic contaminants affecting soil and groundwater pose a significant threat to ecosystems and human health. Fenton oxidation is an efficient treatment for removing these pollutants in the aqueous phase at acidic pH. However, the in-situ application of this technology for soil remediation (where pHs around neutrality are required) presents important limitations, such as catalyst (iron) availability and oxidant (H2O2) stability. The addition of chelating agents (CAs), forming complexes with Fe and enabling Fenton reactions under these conditions, so-called chelate-modified Fenton process (MF), tries to overcome the challenges identified in conventional Fenton. Despite the growing interest in this technology, there is not yet a critical review compiling the information needed for its real application. The advantages and drawbacks of MF must be clarified, and the recent achievements should be shared with the scientific community. This review provides a general overview of the application of CAs to enhance the Fenton process for the remediation of soils polluted with the most common organic contaminants, especially for a deep understanding of the activation mechanisms and influential factors. The existing shortcomings and research needs have been highlighted. Finally, future research perspectives on the use of CAs in MF and recommendations have been provided.

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Cu Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity and High Temperature Anatase Stability

10.26434/chemrxiv.7159733.v1 ◽

2018 ◽

Cited By ~ 2

Author(s):

Snehamol Mathew ◽

Priyanka Ganguly ◽

Stephen Rhatigan ◽

Vignesh Kumaravel ◽

Ciara Byrne ◽

...

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Density Functional ◽

Anatase Phase ◽

Sol Gel ◽

Chemical Properties ◽

Light Irradiation ◽

Health Concern ◽

Bacterial Inactivation ◽

X Ray

Indoor surface contamination by microbes is a major public health concern. A damp environment is one potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO2) can effectively curb this growing threat. Metal-doped titania in anatase phase has been proved as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu) doped TiO2 (Cu-TiO2) was evaluated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO2 was carried out via sol-gel technique. Cu-TiO2 further calcined at various temperatures (in the range of 500 °C – 700 °C) to evaluate the thermal stability of TiO2 anatase phase. The physico-chemical properties of the samples were characterised through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV-visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO2 was maintained well, up to 650 °C, by the Cu dopant. UV-DRS results suggested that the visible light absorption property of Cu-TiO2 was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasises the introduction of Cu+ and Cu2+ ions by replacing Ti4+ ions in the TiO2 lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9%) was attained in 30 mins of visible light irradiation by Cu-TiO2.

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β-Cyclodextrin Polymers on Microcrystalline Cellulose as a Granular Media for Organic Micropollutant Removal from Water

10.26434/chemrxiv.7471508 ◽

2018 ◽

Author(s):

Diego Alzate-Sanchez ◽

Yuhan Ling ◽

Chenjun Li ◽

Benjamin Frank ◽

Reiner Bleher ◽

...

Keyword(s):

Microcrystalline Cellulose ◽

Continuous Flow ◽

Granular Media ◽

Anaerobic Biodegradation ◽

Thin Coating ◽

Micropollutant Removal ◽

Cyclodextrin Polymers ◽

Flow Experiments ◽

Aerobic And Anaerobic ◽

Cellulose Composite

This manuscript describes cyclodextrin polymers formed as a thin coating on microcrystalline cellulose. The resulting polymer/cellulose composite shows promising performance for removing organic pollutants from water and can be packed into columns for continuous-flow experiments. The polymer/cellulose composite also shows excellent resistance to aerobic and anaerobic biodegradation.

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