Degradation of 2,4-dichlorophenol by nanoscale calcium peroxide: Implication for groundwater remediation

Qian, Yanlong; Zhang, Jing; Zhang, Yalei; Chen, Jiabin; Zhou, Xuefei

doi:10.1016/j.seppur.2016.04.010

Cited by 67 publications

(14 citation statements)

References 44 publications

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“…Moreover, the increased surface area can also enable better release of H 2 O 2 and better pollutant remediation performance (Khodaveisi et al, 2011). These characteristics were well demonstrated even by nCaO 2 alone for effective degradation of toluene (Qian, Zhou, Zhang, Zhang, & Chen, 2013), 2,4-dichlorophenol (Qian, Zhang, Zhang, Chen, & Zhou, 2016), and other refractory pollutants (Xu, Pancras, & Grotenhuis, 2011;Zhang, Wang, et al, 2015). However, few studies evaluated the chemical oxidation performance of the nCaO 2 /Fe(II) system.…”

Section: Introductionmentioning

confidence: 99%

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Sun

Lyu

et al. 2019

Water Environment Research

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In this study, nano‐CaO2 (nCaO2) was successfully synthesized and constituted the nCaO2/Fe(II) system applying to remediate BTEX, which are typical mixed pollutants in contaminated groundwater. The particle size of the synthesized nCaO2 was 108.91 nm, and it displayed better BTEX remediation performance than that of commercial CaO2. The innovative generation pattern of hydroxyl radicals (HO·) in the nCaO2/Fe(II) system has been investigated using benzoic acid as the HO· probe, and the proper molar ratio of nCaO2/Fe(II) was optimized as 1/1. Over 90% of BTEX was removed in 180 min with the nCaO2/Fe(II)/BTEX molar ratio of 40/40/1. Further experiments evaluated the influence of co‐existence of mixed pollutants chlorinated hydrocarbon compounds (CHCs) or surfactant constituents on BTEX remediation performance. The experimental results suggested that CHCs have limited influence on BTEX removal rate and surfactants have negative effects on BTEX remediation performance in the experimental conditions. In conclusion, the findings in this study could give some inspirations to apply the nCaO2/Fe(II) process in remediating co‐existing pollutants in contaminated groundwater. Practitioner points nCaO2/Fe(II) system applied to remediate mixed contaminants. HO· generation pattern of the nCaO2/Fe(II) system has been investigated. The influence of chloride hydrocarbon compounds have been studied. The effects of surfactants were evaluated.

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Section: Introductionmentioning

confidence: 99%

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Sun

Lyu

et al. 2019

Water Environment Research

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“…S2). The presence of HA, SO 4 2− , and HCO 3 − can limit the photo-Fenton reaction of hybrid samples by reacting with generated reactive oxygen species (ROS) 32 .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of MgAC-Fe3O4/TiO2 hybrid nanocomposites via sol-gel chemistry for water treatment by photo-Fenton and photocatalytic reactions

Bui

Park

Pham

et al. 2019

Sci Rep

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MgAC-Fe 3 O 4 /TiO 2 hybrid nanocomposites were synthesized in different ratios of MgAC-Fe 3 O 4 and TiO 2 precursor. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray fluorescence spectrometry (XRF), electron spin resonance spectrometry (ESR), Brunauer-Emmett-Teller (BET), photoluminescence (PL), and UV photoelectron spectroscopy (UPS) were used to characterize the nanocomposites. The increase of MgAC-Fe 3 O 4 , in the hybrid nanocomposites’ core-shell structure, led to the decrease of anatase TiO 2 peaks, thus reducing the photo-Fenton and photocatalytic activities. According to the obtained data, MgAC-Fe 3 O 4 [0.05 g]/TiO 2 showed the best photo-Fenton and photocatalytic activities, having removed ~93% of MB (photo-Fenton reaction) and ~80% of phenol (photocatalytic reaction) after 20 and 80 mins, respectively. On the pilot scale (30 L), MgAC-Fe 3 O 4 [0.05 g]/TiO 2 was completely removed after 27 and 30 hours by the photo-Fenton and photocatalytic activities, respectively. The synergistic effect gained from the combined photo-Fenton and photocatalytic activities of Fe 3 O 4 and TiO 2 , respectively, was credited for the performances of the MgAC-Fe 3 O 4 /TiO 2 hybrid nanocomposites.

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“…The nanocatalytic medicine CaO 2 @DOX@ZIF‐67 was synthesized by a bottom‐up approach. First, CaO 2 was prepared via a hydrolysis–precipitation procedure reported in the literature . Second, DOX was immobilized on the surface of CaO 2 to form CaO 2 @DOX by coordination reaction .…”

Section: Methodsmentioning

confidence: 99%

Self‐Supply of O₂ and H₂O₂ by a Nanocatalytic Medicine to Enhance Combined Chemo/Chemodynamic Therapy

et al. 2019

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Combined chemo/chemodynamic therapy is a promising strategy to achieve an improved anticancer effect. However, the hypoxic microenvironment and limited amount of H2O2 in most solid tumors severely restrict the efficacy of this treatment. Herein, the construction of a nanocatalytic medicine, CaO2@DOX@ZIF‐67, via a bottom‐up approach is described. CaO2@DOX@ZIF‐67 simultaneously supplies O2 and H2O2 to achieve improved chemo/chemodynamic therapy. In the weakly acidic environment within tumors, CaO2@DOX@ZIF‐67 is broken down to rapidly release the Fenton‐like catalyst Co2+ and the chemotherapy drug doxorubicin (DOX). The unprotected CaO2 reacts with H2O to generate both O2 and H2O2. The generated O2 relieves the hypoxia in the tumor and further improve the efficacy of DOX. Meanwhile, the generated H2O2 reacts with Co2+ ions to produce highly toxic •OH through a Fenton‐like reaction, resulting in improved chemodynamic therapy.

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Degradation of 2,4-dichlorophenol by nanoscale calcium peroxide: Implication for groundwater remediation

Cited by 67 publications

References 44 publications

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Synthesis of MgAC-Fe3O4/TiO2 hybrid nanocomposites via sol-gel chemistry for water treatment by photo-Fenton and photocatalytic reactions

Self‐Supply of O₂ and H₂O₂ by a Nanocatalytic Medicine to Enhance Combined Chemo/Chemodynamic Therapy

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Degradation of 2,4-dichlorophenol by nanoscale calcium peroxide: Implication for groundwater remediation

Cited by 67 publications

References 44 publications

The performance of nCaO2 for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

The performance of nCaO2 for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Synthesis of MgAC-Fe3O4/TiO2 hybrid nanocomposites via sol-gel chemistry for water treatment by photo-Fenton and photocatalytic reactions

Self‐Supply of O2 and H2O2 by a Nanocatalytic Medicine to Enhance Combined Chemo/Chemodynamic Therapy

Contact Info

Product

Resources

About

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

The performance of nCaO₂ for BTEX removal: Hydroxyl radical generation pattern and the influences of co‐existing environmental pollutants

Self‐Supply of O₂ and H₂O₂ by a Nanocatalytic Medicine to Enhance Combined Chemo/Chemodynamic Therapy