Relevance of a hybrid process coupling adsorption and visible light photocatalysis involving a new hetero-system CuCo2O4/TiO2 for the removal of hexavalent chromium

Kebir, Mohammed; Trari, M.; Maachi, Rachida; Nasrallah, Noureddine; Bellal, B.; Amrane, Abdeltif

doi:10.1016/j.jece.2014.12.024

Cited by 37 publications

(14 citation statements)

References 52 publications

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“…The kinetics of chromate photoreduction is well described by the Langmuir–Hinshelwood model [182]. The heterosystem CuCo 2 O 4 /TiO 2 for the removal of Cr(VI) by photocatalytic reduction under visible light has been reported by Kebir et al [183]. The synergetic effect of adsorption and photocatalytic reduction with proper band alignment are attributed to enhanced Cr(VI) removal from tannery wastewater.…”

Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

107

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Cr(VI) exhibits cytotoxic, mutagenic and carcinogenic properties; hence, effluents containing Cr(VI) from various industrial processes pose threat to aquatic life and downstream users. Various treatment techniques, such as chemical reduction, ion exchange, bacterial degradation, adsorption and photocatalysis, have been exploited for remediation of Cr(VI) from wastewater. Among these, photocatalysis has recently gained considerable attention. The applications of photocatalysis, such as water splitting, CO2 reduction, pollutant degradation, organic transformation reactions, N2 fixation, etc., towards solving the energy crisis and environmental issues are briefly discussed in the Introduction of this review. The advantages of TiO2 as a photocatalyst and the importance of its modification for photocatalytic reduction of Cr(VI) has also been addressed. In this review, the photocatalytic activity of TiO2 after modification with carbon-based advanced materials, metal oxides, metal sulfides and noble metals towards reduction of Cr(VI) was evaluated and compared with that of bare TiO2. The photoactivity of dye-sensitized TiO2 for reduction of Cr(VI) was also discussed. The mechanism for enhanced photocatalytic activity was highlighted and attributed to the resultant properties, namely, effective separation of photoinduced charge carriers, extension of the light absorption range and intensity, increase of the surface active sites, and higher photostability. Advantages and limitations for photoreduction of Cr(VI) over modified TiO2 are depicted in the Conclusion. The various challenges that restrict the technology from practical applications in remediation of Cr(VI) from wastewater were addressed in the Conclusion section as well. The future perspectives of the field presented in this review are focused on the development of whole-solar-spectrum responsive, TiO2-coupled photocatalysts which provide efficient photocatalytic reduction of Cr(VI) along with their good recoverability and recyclability.

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Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

107

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“…Hence 17 effluents from these industry are the major source of Cr(VI) pollution. 18 Several methods have been developed to remove Cr(VI) from water 19 such as liquid extraction [7], chemical precipitation [8], electrodial-20 ysis [9], photocatalysis [10] and membrane filtration [11,12]. 21 However, these methods have several disadvantages including the 22 requirement of large amounts of organic solvent, high cost and far 23 from ideal for technical application.…”

Section: Introductionmentioning

confidence: 99%

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Sakti

Narita

Sasaki

et al. 2015

Journal of Environmental Chemical Engineering

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“…Morphology, structure, and particle size of the synthesized carbon nanospheres were examined by transmission electron microscopy (TEM) using a JEOL JEM 1230 with an acceleration voltage of 80 kV. The pH of zero charge (pH zpc ) of the adsorbent was determined as described elsewhere (Kebir et al, 2015;Shi et al, 2015). To this purpose, 25 mL of 0.01 M NaCl was placed in different Erlenmeyer flasks.…”

Section: Methodsmentioning

confidence: 99%

“…Chromium ions are among the most dangerous heavy metal species. These potentially carcinogenic ions, found in various industrial waters, were placed at the top of the priority list of toxic pollutants by the U.S. EPA (Amin, 2013;Kebir et al, 2015;Liu et al, 2012;Luo et al, 2013;Qian et al, 2012;Sun et al, 2014;Tang et al, 2013;Zhang et al, 2013;Zhou et al, 2013). A maximum acceptable concentration of 0.1 mg/L is proposed for total chromium in drinking water (U.S. .…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr(VI) from Aqueous Solutions Using Amino‐Functionalized Carbon Nanospheres Adsorbents

Benadji

Ikkene

Boudjemaa

et al. 2018

Water Environment Research

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Carbon nanospheres were prepared and functionalized with carboxyl acid groups (CNS-CA), then reacted with 3-aminopropyltriethoxysilane to introduce amino groups onto the surface (CNS-NH 2 ) by post-synthesis grafting. CNS-NH 2 was acidified in order to convert the amino groups (-NH 2 ) into ammonium moieties (ÀNH þ 3 ). Various techniques such as N 2 physisorption, X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy, and transmission electron microscopy were used to characterize the nanospheres. The removal of chromium ions from aqueous solution using CNS-NH þ 3 was investigated. Factors influencing the uptake of Cr(VI) ions such as solution pH, adsorbent dose, and initial Cr(VI) ion concentration were investigated. Equilibrium adsorption data fitted the Langmuir model very well. The adsorption maximum capacity of Cr(VI) was found to be 52.38 mg/g. The reusability of CNS-NH þ 3 results indicated that it can be reused five times successfully without loss of adsorption capacity. Water Environ. Res., 90, 1925Res., 90, (2018.

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Relevance of a hybrid process coupling adsorption and visible light photocatalysis involving a new hetero-system CuCo2O4/TiO2 for the removal of hexavalent chromium

Cited by 37 publications

References 52 publications

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Removal of Cr(VI) from Aqueous Solutions Using Amino‐Functionalized Carbon Nanospheres Adsorbents

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Relevance of a hybrid process coupling adsorption and visible light photocatalysis involving a new hetero-system CuCo2O4/TiO2 for the removal of hexavalent chromium

Cited by 37 publications

References 52 publications

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Removal of Cr(VI) from Aqueous Solutions Using Amino‐Functionalized Carbon Nanospheres Adsorbents

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Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction