Photocatalytic reduction of chromium (VI) using combustion synthesized TiO2

Sane, Priyanka K.; Chaudhari, Sushil M.; Nemade, Parag R.; Sontakke, Sharad M.

doi:10.1016/j.jece.2017.11.060

Cited by 72 publications

(32 citation statements)

References 24 publications

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“…The chromium release in environment occurs via the industrial effluents from tannery, mining, dyes industries, printing, industry of photography, and the drug industries; therefore, the treatment of waste water for chromium removal represents a challenge for environmental protection [ 22 ]. Some of the most employed techniques are: electrocoagulation [ 23 ], adsorption [ 24 , 25 ], biological treatment [ 26 ], and photo catalysis [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

et al. 2021

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The adsorptive potential has been evaluated for the aminopropyl functionalized mesoporous silica materials obtained by co-condensation and post grafting methods. Nitrogen sorption, small angle neutron and X-ray scattering (SANS and SAXS) demonstrated high surface area and well-ordered hexagonal pore structure suitable for applications as adsorbents of metals from waste waters. A comparison of Cr(VI) adsorption properties of the materials prepared by different functionalization methods has been performed. The obtained results demonstrated the adsorption capacity due to the affinity of the chromium ions to the amino groups, and showed that co-condensation of tetraethoxysilane (TEOS) and 3-aminopropyl triethoxysilane (APTES) resulted in higher metal sorption capacity of the materials compared to post-synthesis grafting of aminopropyl groups onto the mesoporous silica particles.

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Section: Introductionmentioning

confidence: 99%

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

et al. 2021

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“…These approaches are hampered by their high cost and creation of concentrated Cr (VI) solid wastes that require further management and pose secondary pollutant risks (Barrera‐Díaz et al, 2012). Recently, advanced oxidation processes, such as photocatalysis, have shown a potential for Cr (VI) treatment (Sane et al, 2018) and the use of photocatalysts for Cr (VI) treatment has increased due to easy preparation and high efficiency (Xu et al, 2013; R. Yan et al, 2020; Y. Yang et al, 2014). Among the various photocatalysts being used to remove Cr (VI) pollutants from water, titanium dioxide (TiO 2 ) has received increased attention due to its photocatalytic activity in the solar spectrum, high oxidizing potential, chemical and biological stability, high selectivity, and low human toxicity (Abellan et al, 2009; Hussain et al, 2011; Sun et al, 2002; Tahir & Amin, 2013; Zainudin et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…By definition, in photocatalytic reactions, solar energy changes into chemical energy for the oxidation or reduction of pollutions (Nakata & Fujishima, 2012). This process has been used by several researchers for Cr (VI) removal from aqueous solutions (Sane et al, 2018; Wu et al, 2013; Yin, He et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr (VI) from aqueous solutions using clinoptilolite modified by TiO₂ and polyoxypropylene surfactant

Soleimani

Amini

2021

Remediation Journal

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Due to their toxicity, the removal of heavy metal contaminants, particularly from aqueous solutions, is an important issue for the remediation field. This paper describes the performance of photocatalytic reduction of hexavalent chromium (Cr [VI]) using clinoptilolite as a natural zeolite (Ze) modified by titanium dioxide (TiO2 or Ti) and polyoxypropylene (POP) surfactant. The removal efficiency of the modified Ze was evaluated in the presence of Ze–Ti–POP and Ze–Ti nanocomposites under UV‐A irradiation and visible light. The effects of different factors including contact time (0–330 min), adsorbent dose (2, 4, 6, 8, and 10 g/L), initial pH (1, 2, 3, 4, and 5), and initial Cr (VI) concentration (5, 10, 15, 20, and 25 mg/L) were studied. The results showed that maximum removal efficiencies of Cr (VI) by Ze–Ti and Ze–Ti–POP nanocomposites in the optimum experimental conditions (i.e., contact time: 30 min, dose: 10 g/L, pH: 2, initial concentration: 10 mg/L) under UV‐A irradiation were 88% and 97%, while the corresponding reductions for visible light were 80% and 91%, respectively. Adsorption kinetics data fit well with the pseudo‐second‐order model. Furthermore, reusing nanocomposites after three regeneration cycles revealed that the application of Ze–Ti and Ze–Ti–POP nanocomposites could be a promising approach for removing Cr (VI) from aqueous solutions.

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“…The rapid growth of technology and manufacturing results in an increase in waste pollution to the environment. Heavy metals from industrial waste are one of contributors to water pollution [1]. These toxic metals cannot be broken down by microorganisms, and when accumulated in the body cause severe illness and even death [2].…”

Section: Introductionmentioning

confidence: 99%

“…Chromium in hexavalent form is 500 times more carcinogenic and very toxic compared to its trivalent form because it penetrates cell membranes and causes harmful effects. The maximum acceptable environmental threshold values for Cr(III) and Cr(VI) are 5 mg/L and 0.05 mg/L, respectively [1].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Titanium Dioxide/Silicon Dioxide from Beach Sand as Photocatalyst for Cr and Pb Remediation

et al. 2020

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Heavy metals are non-biodegradable and have a high toxicity effect on microorganisms which makes their presence in the environment extremely dangerous. The method of handling heavy metal waste by photocatalysis techniques using TiO2/SiO2 composite showed a good performance in reducing harmful pollutants. In this study, SiO2 from Bengkulu beach sand, Indonesia, was used as a support material for TiO2 photocatalyst to remove Cr(VI) and Pb(II). SiO2 was obtained through leaching techniques using NaOH as a solvent. The TiO2/SiO2 composite photocatalyst was synthesized using a solvothermal method at 130 °C and then characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and a particle size analyzer (PSA). Based on the XRD diffractogram, the synthesized TiO2 showed the anatase structure while the SiO2 showed the amorphous structure. The Ti–O–Si bond is defined in the infrared (IR) spectra, which indicates that the relationship between TiO2 and SiO2 is a chemical interaction. The results of SEM and PSA characterizations show agglomerated spherical (round) particles with a mean particle size of 616.9 nm. The TiO2/SiO2 composite of 7:1 ratio showed the highest photocatalytic activity after 180 min of ultraviolet (UV) irradiation, with a concentration-decrease percentage of 93.77% and 93.55% for Cr(VI) and Pb(II), respectively.

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Photocatalytic reduction of chromium (VI) using combustion synthesized TiO2

Cited by 72 publications

References 24 publications

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

Removal of Cr (VI) from aqueous solutions using clinoptilolite modified by TiO₂ and polyoxypropylene surfactant

Synthesis of Titanium Dioxide/Silicon Dioxide from Beach Sand as Photocatalyst for Cr and Pb Remediation

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Photocatalytic reduction of chromium (VI) using combustion synthesized TiO2

Cited by 72 publications

References 24 publications

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

Comparison of Structure and Adsorption Properties of Mesoporous Silica Functionalized with Aminopropyl Groups by the Co-Condensation and the Post Grafting Methods

Removal of Cr (VI) from aqueous solutions using clinoptilolite modified by TiO2 and polyoxypropylene surfactant

Synthesis of Titanium Dioxide/Silicon Dioxide from Beach Sand as Photocatalyst for Cr and Pb Remediation

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Removal of Cr (VI) from aqueous solutions using clinoptilolite modified by TiO₂ and polyoxypropylene surfactant