Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Miranda, Maicon Oliveira; Viana, Bartolomeu C.; Honorio, Luzia M. C.; Trigueiro, Pollyana; Fonseca, Maria G.; Franco, Francisco; Osajima, Josy A.; Filho, Edson Cavalcanti da Silva

doi:10.3390/min10020132

Cited by 14 publications

(7 citation statements)

References 67 publications

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“…The presence of Cu-CD provoked the following increases in the apparent first-order rate constant: MO, 429% in the constant rate ( k ap c = 1.184 ± 0.003 min −1 ); O-II, 653% in the constant rate ( k ap c = 1.002 ± 0.036 min −1 ); RB-5, 301% in the constant rate ( k ap c = 0.709 ± 0.029 min −1 ); RBB-R, 167% in the constant rate ( k ap c = 0.230 ± 0.004 min −1 ). These discoloration rate values are much higher than the majority of results reported in the literature for the same dyes using other AOPs [ 39 , 41 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ].…”

Section: Resultscontrasting

confidence: 59%

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Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

Cardoso

Silva

et al. 2022

Nanomaterials

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A catalytic ozonation advanced oxidation process (AOP) with a copper(II)-doped carbon dot as catalyst, Cu-CD (using L-cysteine and polyethylene glycol (PEG) as precursors and passivation agents), was developed for textile wastewater treatment (T = 25 °C and pH = 7). Four dyes were analyzed—Methyl Orange (MO), Orange II sodium salt (O-II), Reactive Black 5 (RB-5) and Remazol Brilliant Blue R (RBB-R), as well as a real effluent from the dying and printing industry. The Cu-CD, with marked catalytic ozonation properties, was successfully synthesized by one-pot hydrothermal procedure with a size of 4.0 nm, a charge of −3.7 mV and a fluorescent quantum yield of 31%. The discoloration of the aqueous dye solutions followed an apparent first-order kinetics with the following rate constants (kap in min−1): MO, 0.210; O-II, 0.133; RB-5, 0.177; RBB-R, 0.086. In the presence of Cu-CD, the following apparent first-order rate constants were obtained (kapc in min−1) with the corresponding increase in the rate constant without catalyst (%Inc): MO, 1.184 (464%); O-II, 1.002 (653%); RB-5, 0.709 (301%); RBB-R, 0.230 (167%). The presence of sodium chloride (at a concentration of 50 g/L) resulted in a marked increase of the discoloration rate of the dye solution due to generation of other radicals, such as chlorine and chlorine oxide, resulting from the reaction of ozone and chloride. Taking into consideration that the real textile effluent under research has a high carbonate concentration (>356 mg/L), which inhibits ozone decomposition, the discoloration first-order rate constants without and with Cu-CD (kap = 0.0097 min−1 and kapc = 0.012 min−1 (%Inc = 24%), respectively) were relatively small. Apparently, the Cu-CD, the surface of which is covered by a soft and highly hydrated caramelized PEG coating, accelerates the ozone decomposition and dye adsorption, increasing its degradation.

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Section: Resultscontrasting

confidence: 59%

“…strains, and k ap c changed from 0.1077 to 0.1914 min −1 [ 57 ]. Palygorskite was modified with TiO 2 to produce a photocatalyst for the degradation of RBB-R, with k ap c varying from 0.0610 × 10 −2 to 0.0687 × 10 −2 min −1 [ 58 ].…”

Section: Resultsmentioning

confidence: 99%

Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

Cardoso

Silva

et al. 2022

Nanomaterials

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“…However, much remains to be done to ensure the environmentally friendly use of toxic chemicals in accordance with the principles of sustainable development and to improve the quality of human life. [ 1 ] Researchers and government entities need to explore solutions to mitigate a large amount of pollutants released into the environment, including pharmaceuticals and personal care products, in addition to endocrine disrupting compounds, alkylphenols, perfluorinated compounds, industrial organic chemicals, and pesticides. [ 2 ]…”

Section: Introductionmentioning

confidence: 99%

“…The use of heterogeneous nanocatalysts is a promising method, and it presents a promising option for the synthesis of organic compounds to obtain exceptional performance in terms of high activity, simple recovery, and recycling. [ 1,20 ] Clays possess certain properties which make them an ultimate choice as adsorbents or a catalysis support. This is due to their low cost, and high mechanical and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Catalytic Degradation of Diuron Using Algerian Sodium Montmorillonite

Tlemsani

Taleb

Piraúlt-Roy

et al. 2021

CLEAN Soil Air Water

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Diuron is categorized as a probable human carcinogen by the United States Environmental Protection Agency (EPA). This work is aimed to determine the optimal conditions for the catalytic degradation of Diuron in an aqueous solution with H2O2 using Algerian sodium Montmorillonite (Mont‐Na) as the catalyst. The material is characterized before and after the experiment using X‐ray diffraction, Fourier transform infrared (FTIR) spectroscopy, specific surface area (SBET), elemental analysis, and thermal analysis (TGA/DTA). The surface charge is determined by measuring the point of zero charge. Tests with H2O2 without Mont‐Na provide a 32% conversion rate after 8 h. However, a mixture of 1 g Mont‐Na and H2O2 increases the conversion rate to 91% after 180 min at 25 °C and pH 6.3. The Diuron disappearance is evidenced by high‐performance liquid chromatography using a UV–vis detector (HPLC/UV–vis). Specifically, 3,4‐dichloroaniline (DCA) is the only by‐product. At the basic pH values 9 and 11, a conversion rate of 72.5% is achieved with a lower contact time of 150 min. A change in temperature toward higher values results in a decrease in the degradation rate. Overall, Algerian sodium Montmorillonite is used successfully for the heterogeneous catalytic degradation of Diuron from polluted water.

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“…One of interesting application of clays is in development of electrode materials. Aluminosilicate-modified electrodes have found numerous applications for electroanalytical applications [5] as photoelectrocatalyst [6] or electrocatalyst [7,8]. The properties of clays such as ion-exchange properties, chemical stability, layered aluminosilicate structure and low cost made them desirable material.…”

Section: Introductionmentioning

confidence: 99%

The influence of pH on electrochemical behavior of nicotine-clay based electrodes

et al. 2021

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Montmorillonite based clay was acid activated. Nicotine was adsorbed on untreated and acid activated clay from its aqueous solution at either pH=6 or pH=9.26 (unadjusted pH solution). The XRD analysis revealed that the 001 basal spacing of montmorillonite after nicotine adsorption was around 1.38 nm, regardless of clay treatment or pH of adsorption. The obtained values for basal spacing indicate that nicotine is in monolayer arrangement. In order to investigate electrochemical properties, untreated and acid activated clay, with and without nicotine, were used as modifier of carbon paste electrode. Cyclic voltammetry and electrochemical impedance spectroscopy were employed to study electrochemical response of clay-modified electrodes toward ferrocyanide probe. The nicotine-modified untreated clay used as paste electrode showed enhanced electrochemical response toward ferrocyanide probe in comparison to electrode based on clay without nicotine. On the other hand, adsorbed nicotine on acid activate clay resulted in lower electrode activity. Electrochemical response of adsorbed nicotine was studied at different pH. Nicotine oxidation at each of investigated samples followed the same trend regardless of clay treatment or pH at which adsorption was performed. For all samples, nicotine oxidation peak potential showed linear dependence on pH in pH range from 3.7 to 9.0, with slopes close to the value of 59 mVdec-1 expected for equal number of protons and electrons involved in the reaction. The nicotine reduction process was best resolved at pH = 1 at potential around -1.35 V, while the following cathodic wave observed at potential around -1.5 V was ascribed to the cathodic hydrogen reduction. Mechanism of electrochemical oxidation was not influenced by pH of adsorption, i.e., nicotine form. The amount of adsorbed nicotine was not correlated with the electrochemical activity suggesting that only small number of adsorbed nicotine was involved in electrochemical response.

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Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Cited by 14 publications

References 67 publications

Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

Heterogeneous Catalytic Degradation of Diuron Using Algerian Sodium Montmorillonite

The influence of pH on electrochemical behavior of nicotine-clay based electrodes

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