Photodegradation of chloroform in aqueous solution: Impact of montmorillonite KSF particles

Li, Jing; Wu, Feng; Mailhot, Gilles; Deng, Nansheng

doi:10.1016/j.jhazmat.2009.09.061

Cited by 24 publications

(7 citation statements)

References 32 publications

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“…Such structure gives montmorillonite high potential for use in contaminant adsorption and removal. Montmorillonite has been used as a heterogeneous catalyst for Fenton oxidation Chen et al 2011) and for photodegradation of organic contaminants (Liu et al 2010;Li et al 2010Li et al , 2012. As a natural clay mineral, montmorillonite contains iron species, namely structural iron and free iron (Fe(II) and Fe(III)), which could promote the generation of hydroxyl radical (HO • ) under irradiation (Wu et al 2008).…”

Section: Responsible Editor: Angeles Blancomentioning

confidence: 99%

Solid surface photochemistry of montmorillonite: mechanisms for the arsenite oxidation under UV-A irradiation

Yuan

Wang

Ding

et al. 2015

Environ Sci Pollut Res

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Transformation of inorganic arsenic species has drawn great concern in recent decades because of worldwide and speciation-dependent pollution and the hazards that they pose to the environment and to human health. As(III) photooxidation in aquatic systems has received much attention, but little is known about photochemical transformation of arsenic species on top soil. As(III) photooxidation on natural montmorillonite under UV-A radiation was investigated by using a moisture- and temperature-controlled photochemical chamber with two black-light lamps. Initial As(III) concentration, pH, layer thickness, humic acid (HA) concentration, the presence of additional iron ions, and the contribution of reactive oxygen species (ROS) were examined. The results show that pH values of the clay layers greatly influenced As(III) photooxidation on montmorillonite. As(III) photooxidation followed the Langmuir-Hinshelwood model. HA and additional iron ions greatly promoted photooxidation, but excess Fe(II) competed with As(III) for oxidation by ROS. Scavenging experiments revealed that natural montmorillonite induced the conversion of As(III) to As(V) by generating ROS (mainly HO(•) and HO2(•)/O2(•-)) and that HO(•) radical was the predominant oxidant in this system. Our work demonstrates that photooxidation on the surface of natural clay minerals in top soil can be important to As(III) transformation. This allows understanding and predicting the speciation and behavior of arsenic on the soil surface.

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Section: Responsible Editor: Angeles Blancomentioning

confidence: 99%

Solid surface photochemistry of montmorillonite: mechanisms for the arsenite oxidation under UV-A irradiation

Yuan

Wang

Ding

et al. 2015

Environ Sci Pollut Res

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“…It is known that there are trace amounts of chloroform accompanying water of all types whether, drinking water, surface water, tap water, and domestic sewage, cooling water in industrial plants, groundwater, as a side product in the chlorination stage during the remedy process for wastewater to decrease the hazard of diseases due to microorganisms or viruses [1]. Through the previous periods, chloroform was utilized as a doped for operations and in many products such as cough suppressants and toothpaste, in addition, that chloroform is used also in industrial processes producing many typically materials of various uses such as lubricating oils, cleaning solvents, bleaching paper, refrigerants, rubber, intermediate materials in the pharmaceutical industry for herbicides and fungicides [2]. Emission of chloroform causes damage to the environment, in particular, the destruction of the ozone layer [3].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of Synergistic Pulsation Bubble Column with Inverse Fluidized Loop Reactor for Removing Chloroform from Wastewater

Ezzi

2020

IJE

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In this study, the feasibility of using the developed design for the removal of organic pollutants from wastewater was examined. The design includes the integration of the work of both pulsation bubble column (PBC) and the inverse fluidization airlift loop reactor (IFALR). The experimental podium was fabricated and installed which that consists of a bubble column with a diameter of 5 cm and a height of 210 cm, contains at the top a solenoid valve which is electrically turned via at least two timers, and its connection with the loop reactor by a one-way valve. The loop reactor consists of an outer rectangular tube with dimensions (29 cm long x 15.5 cm wide x 150 cm high) and an internal draft tube with 9 cm diameter and 120 cm long as granular activated carbon is put as an adsorbent in the annulus region between the inner and outer tube. Experiments were conducted using one of the organic pollutants namely chloroform, with a work scenario that includes changing both the airflow rate (2-20) liters/minute, the total survival time of the treatment (5-60) minutes, the molar ratio of the chloroform pollutant to the oxidizing agent of hydrogen peroxide (1/10-1/20). The results showed removal efficiency near to 89%, and it gives an indication of the success of the proposed design, with the possibility of recycling the treated water and releasing it to the environment due to the low risk of the organic pollutant in it.

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“…This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited. mud, were also applied for the remediation of chloroform from water resources (12,16,(23)(24)(25).…”

Section: Introductionmentioning

confidence: 99%

Cheap Nano-Adsorbents Based on Zno/Mineral Nanocomposites for Removal of Chloroform from Water Solution

Salehi-Babarsad

Derikvand

Razaz

et al. 2020

Jundishapur J Health Sci

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Background: Chloroform, as a hazardous chemical, can contaminate water resources via the reaction of chlorine as an antiseptic chemical with humic acids resulted from agricultural activities. In humans, chloroform may cause dizziness, heart disorders, and disorders of the nervous system. Hence, its removal is of crucial importance. Objectives: The current study aimed to propose cheap and efficient adsorbents to remove chloroform from water. Methods: Four different nanomaterials (ZnO, ZnO/graphene oxide (ZnO/GO), ZnO/GO/Zeolite, and GO/Zeolite nanocomposites) were prepared and characterized with X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) images. Textural properties of the nano- adsorbents were evaluated using Brunauer Emmet Teller (BET) and Barrett-Joyner-Halenda (BJH) techniques. Different isotherms and kinetic models were studied. The effect of pH on the removal efficiency of the nano-adsorbents was tested. Regenerability of the nano-adsorbents towards the removal of the chloroform was also evaluated. Results: XRD patterns and FESEM images of the nanocomposites confirmed lattice structures and nanoscale particle size of the prepared nanocomposites. According to the BET and BJH models, all samples had mesoporous structures. The BJH cumulative surface area of pores of ZnO, ZnO/GO, ZnO/GO/Zeolite, and GO/Zeolite nanocomposites were 8.5, 26.4, 17.2, and 20.8 m2/g, respectively. The best removal speed and efficiency were obtained according to the different isotherm and kinetic models for the removal of chloroform ZnO/GO nanocomposites. All adsorbents revealed characteristic adsorption in the pH range of 7 to 8. Conclusion: The ZnO/GO, a cheap and efficient nanocomposite, showed the best performance to remove chloroform from water samples due to its superior textural property. Hence, it can be used to remove chloroform from water for up to 5 cycles.

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Photodegradation of chloroform in aqueous solution: Impact of montmorillonite KSF particles

Cited by 24 publications

References 32 publications

Solid surface photochemistry of montmorillonite: mechanisms for the arsenite oxidation under UV-A irradiation

Solid surface photochemistry of montmorillonite: mechanisms for the arsenite oxidation under UV-A irradiation

An Experimental Investigation of Synergistic Pulsation Bubble Column with Inverse Fluidized Loop Reactor for Removing Chloroform from Wastewater

Cheap Nano-Adsorbents Based on Zno/Mineral Nanocomposites for Removal of Chloroform from Water Solution

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