Characterization and photocatalytic treatability of red water from Brazilian TNT industry

Ludwichk, Raquel; Helferich, Oliver Karil; Kist, Cristiane Patrícia; Lopes, Aline Chitto; Cavasotto, Thiago; Silva, Davi Costa; Barreto-Rodrigues, Márcio

doi:10.1016/j.jhazmat.2015.03.017

Cited by 35 publications

(9 citation statements)

References 21 publications

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“…In Figure , it is possible to observe metal adsorption at <800 cm −1 in stretching vibration for M‐OH and M‐O‐M bonds. At 600 cm −1 , it is observed the peaks that are related to Ti‐O‐Ti bonds, present in the three meshes indicating the presence of titanium over the aluminum surface . Figure 4C presents the spectrum for the acidified and calcined mesh after immobilization of titanium and after the treatment of the synthetic dyes.…”

Section: Resultsmentioning

confidence: 97%

“…For some years it has been frequently used in its powder form and dispersed in the liquid phase by stirring processes; however, separation costs required after the treatment with TiO 2 suspension make the treatment unfeasible . Studies have now focused on immobilizing TiO 2 over solid surfaces in order to ease its handling and improve its light harvesting capacity …”

Section: Introductionmentioning

confidence: 99%

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New aluminum mesh from recyclable material for immobilization of TiO₂ in heterogeneous photocatalysis

et al. 2020

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This study presents a new aluminium mesh made out of soda can rings as a support for titanium dioxide (TiO 2 ) in the degradation of the synthetic dyes Bordeaux Red (BR) and Tartrazine (TT). Three pre-treatments including calcination and acidification steps were investigated in order to select the most efficient immobilization procedure for photocatalysis application. Raw and titania-aluminum meshes were characterized by scanning electron microscopy, x-ray diffraction, diffuse reflectance, and Fourier transform infrared spectroscopy. The material presented itself as a suitable alternative in the immobilization of titania for wastewater treatment. Preliminary tests selected H 2 O 2 /TiO 2(suspension) oxidation systems under natural sunlight and germicidal lamps (UVC) exhibiting 97.2% and 99.5% of degradation in 180 minutes, respectively. Immobilized TiO 2 systems reached high degradation rates (>99%) after 180 minutes in both UVC and solar light-based processes. An experimental planning study was carried out for the processes in order to find the best operational conditions and pseudo-first-order model fit well the removal data (discolouration rates of in the order of 0.0274 and 0.0145 min −1 for UVC and solar light systems, respectively). Parameters such as TOC, COD, and turbidity, revealed a great improvement in the environmental quality of the water after the treatment and acute toxicity bioassays demonstrated a significant decrease in toxicity for both systems after the treatments. The TiO 2 -meshes demonstrated high performance in the removal after five cycles of operation. Therefore, the new immobilization procedure demonstrated that the TiO 2 -aluminum mesh is a feasible option for wastewater treatment and photocatalysis. K E Y W O R D Sadvanced oxidation processes, ecotoxicity, heterogeneous photocatalysis, photocatalyst immobilization, synthetic dyes

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

New aluminum mesh from recyclable material for immobilization of TiO₂ in heterogeneous photocatalysis

et al. 2020

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“…Although the suspended system has presented best results related to degradation, the difference was only 6.52%. In addition, the immobilized catalyst choice offers advantages, for instance, it facilitates its recovery in the end of the process and allows good catalyst handling (LUDWICHK et al, 2015;ERJAVEC et al, 2016;BARBOSA et al, 2019).…”

Section: Preliminary Testsmentioning

confidence: 99%

Titanium dioxide immobilization in recycled aluminum net for degradation of textile dye by Heterogeneous Photocatalysis trough neural networks

Santana

Barbosa

Silva

et al. 2019

REGET

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In this work, aluminum net crafted (recycled) were used as TiO2 support for the treatment of textile dye Remazol golden yellow (RGY 150). The immobilization of 200mg of TiO2 was accomplished after aluminum net calcination. The following experiments were carried out in a photocatalytic bench reactor: preliminary tests, a 23 factorial experimental design with best system and the degradation kinetic in systems with TiO2 supported on aluminum net.It was observed characteristic peaks of aluminum and TiO2 (anatase and rutile) by XRD and the catalyst film formation was verified by SEM. The system UV/H2O2/TiO2 performed higher efficiency, with 99% of dye degradation in 50 minutes, followed by the system UV/H2O2/TiO2sp with 93% of dye degradation. Whereas the supported catalyst presents execution advantages and high degradation rates, the factorial design was realized for this system, displaying best degradation (100% degradation in 35 minutes). It was obtained k = 0.114 min-1 and R² = 0.994 in a pseudo-first-order model adjustment system. The use of artificial neural network was proven to be efficient to predict the degradation of a textile dye, with an absolute error of 0.0181. After treatment, there was a decrease of dye toxicity.

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“…Recently, Alam et al 65 demonstrated graphene oxide (GO) supported Ag-TiO 2 nano-lms for effective photo degradation of 4-nitrobenzenethiol (4-NBT) upon UV irradiation. Different support mechanisms for TiO 2 catalyst such as, TiO 2 lm on borosilicate glass, 66 nano-TiO 2 on activated carbon bre or ACF, 67 surface modication of nanosize TiO 2 by chemical adsorption 68 were employed by researchers to develop efficient UV-TiO 2 photocatalytic processes for degradation of nitroaromatic explosives. Schmelling and Gray 69 reported that coloured sensitizers did not play any detectable role in photo degradation of 2,4,6-TNT in a TiO 2 slurry reactor in near UV radiation (l > 340 nm) with 90% degradation of TNT achieved in 120 min.…”

Section: Heterogeneous Photo Degradationmentioning

confidence: 99%

Application of photo degradation for remediation of cyclic nitramine and nitroaromatic explosives

Mahbub

Nesterenko

2016

RSC Adv.

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Characterization and photocatalytic treatability of red water from Brazilian TNT industry

Cited by 35 publications

References 21 publications

New aluminum mesh from recyclable material for immobilization of TiO₂ in heterogeneous photocatalysis

New aluminum mesh from recyclable material for immobilization of TiO₂ in heterogeneous photocatalysis

Titanium dioxide immobilization in recycled aluminum net for degradation of textile dye by Heterogeneous Photocatalysis trough neural networks

Application of photo degradation for remediation of cyclic nitramine and nitroaromatic explosives

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Characterization and photocatalytic treatability of red water from Brazilian TNT industry

Cited by 35 publications

References 21 publications

New aluminum mesh from recyclable material for immobilization of TiO2 in heterogeneous photocatalysis

New aluminum mesh from recyclable material for immobilization of TiO2 in heterogeneous photocatalysis

Titanium dioxide immobilization in recycled aluminum net for degradation of textile dye by Heterogeneous Photocatalysis trough neural networks

Application of photo degradation for remediation of cyclic nitramine and nitroaromatic explosives

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Product

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New aluminum mesh from recyclable material for immobilization of TiO₂ in heterogeneous photocatalysis

New aluminum mesh from recyclable material for immobilization of TiO₂ in heterogeneous photocatalysis