Isomorphous substitution of Zr in the framework of aluminosilicate HY by an electrochemical method: Evaluation by methylene blue decolorization

Jalil, Aishah Abdul; Triwahyono, Sugeng; Adam, Siti Hazirah; Jaafar, Nur Farhana; Satar, Mohammad Azrul Hisham

doi:10.1016/j.apcatb.2012.05.042

Cited by 94 publications

(63 citation statements)

References 63 publications

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“…Though, most of the unspent dyes generate undesirable effluents and usually discharged to the environment with or without further treatment [1,[5][6][7]. These effluents run into water bodies and can cause severe problems if not being treated properly as they are toxic, mutagenic and carcinogenic to human life as well as prohibit the photosynthesis of aquatic life even as small quantities as 1 ppm [3,4]. To overcome this problems, several methods have been reported for the removal of such dyes including chemical and biological oxidation, adsorption, electrochemical oxidation, coagulation and flocculation, ion exchange, and membrane separation [5,6,[8][9][10].…”

Section: -2506mentioning

confidence: 99%

“…In Malaysia, about 97% of the dye effluents are mainly come from three industrial classes, which are food, chemical and textiles industry [3]. Among this, about 22% of the total volume of these industrial wastewater is from the textile industry, commonly use basic dyes, such as crystal violet, rhodamine B, methyl violet, methylene blue and etc., to add colour for their final products of wool, silk, cotton, linen and modified acrylic fibres [3][4]. Though, most of the unspent dyes generate undesirable effluents and usually discharged to the environment with or without further treatment [1,[5][6][7].…”

Section: -2506mentioning

confidence: 99%

“…world production of dyes is lost during dyeing processes and is released in textile effluents [1][2][3]. In Malaysia, about 97% of the dye effluents are mainly come from three industrial classes, which are food, chemical and textiles industry [3].…”

Section: -2506mentioning

confidence: 99%

“…as photocatalysts has became attractive and accorded great importance due to its potential to destroy and transform a wide range of harmful dyes at ambient temperature to the simplest form of nontoxic products, CO 2 and water [2][3][4]. Zeolite is considered to be an important support owing to their high surface area, high thermal stability, eco-friendly nature, and also have reported to provide specific photophysical properties such as control charge transfer and electron transfer processes [3,4]. A review of recent research revealed that some of the succesful examples of metal oxides supported zeolite are TiO 2 -HZSM-5, Co-ZSM-5, CuO-X zeolite and Feexchange zeolite [3,4,[11][12][13].…”

Section: -2506mentioning

confidence: 99%

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PERFORMANCE OF EGZrO2-EGFe2O3/HY AS PHOTOCATALYST AND ITS EFFICACY IN DECOLORIZATION OF DYE-CONTAMINANTS

Sapawe¹

2016

MJAS

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The performance of electrogenerated metals supported on HY zeolite (EGZrO 2 -EGFe 2 O 3 /HY) was studied under sunlight irradiation for the decolorization of methylene blue (MB) and Congo red (CR) in aqueous solutions. The prepared photocatalysts were examined using X-ray diffraction (XRD), transmission electron microscopy (TEM), and Brunnauer-Emmett-Teller surface area analysis (BET). An amount of 0.375 g L −1 EGZrO 2 -EGFe 2 O 3 /HY was found to be the optimum dosage for 10 mg L −1 dyes, which gave almost complete photodecolorization of both MB and CR dye after 2 hours of contact time at pH 9 and pH 7, respectively. In addition, a control experiment was also conducted under similar conditions to confirm the efficacy of the prepared photocatalyst. The simple preparation of the photocatalyst and low amount of metal loading required, with simultaneously existence of synergistic effect from both metal oxides exhibits the great potential of the system that could be applied in textile or other industries wastewater treatment. Keywords: photocatalyst, dyes, decolorization, sunlight AbstrakKeupayaan logam elektrogenerasi disokong pada zeolit HY (EGZrO 2 -EGFe 2 O 3 /HY) telah dijalankan di bawah sinar matahari untuk penyahwarnaan metilena biru (MB) dan Congo merah (CR) dalam larutan akues. Fotomangkin telah dikaji menggunakan pembelauan sinar X-ray (XRD), mikroskopi elektron transmisi (TEM), dan analisis luas permukaan Brunnauer-Emmett-Teller (BET). Sejumlah 0.375 g L −1 EGZrO 2 -EGFe 2 O 3 /HY telah didapati sebagai dos optimum untuk 10 mg L −1 larutan pewarna, yang memberikan penyahwarnaan hampir lengkap bagi kedua-dua pewarna MB dan CR selepas 2 jam tindak balas pada pH 9 dan pH 7. Di samping itu, satu eksperimen kawalan juga telah dijalankan pada keadaan yang sama untuk mengesahkan keberkesanan fotomangkin yang disediakan. Penyediaan yang mudah untuk fotomangkin dan jumlah muatan logam sedikit yang diperlukan, pada masa yang sama dengan kewujudan kesan sinergi dari kedua-dua oksida logam mempamerkan potensi besar untuk sistem ini digunakan dalam industri tekstil atau industri rawatan air sisa yang lain.

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Section: -2506mentioning

confidence: 99%

Section: -2506mentioning

confidence: 99%

Section: -2506mentioning

confidence: 99%

Section: -2506mentioning

confidence: 99%

See 2 more Smart Citations

PERFORMANCE OF EGZrO2-EGFe2O3/HY AS PHOTOCATALYST AND ITS EFFICACY IN DECOLORIZATION OF DYE-CONTAMINANTS

Sapawe¹

2016

MJAS

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“…However, excess catalyst causes greater turbidity of the medium. Scattering of light by excess suspended moities reduces light penetration and ability to reach active sites and inhibit photodecolorization [30]. The optimum catalyst dosage was hence chosen as 0.40 g/L.…”

Section: F Photocatalytic Performance Of Zno and Zno/csac-60 1) Effementioning

confidence: 99%

Enhanced Photocatalytic Performance of ZnO Loaded Cotton Stalk Activated Carbon Composite on MB and RHB Dyes Under Sunlight Irradiation

Prabu¹

2017

IJRASET

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INTRODUCTION Dyes are widely used in textile, rubber, paper, plastic and cosmetic industries. They discharge high amount of dyes into the water bodies every day [1] and nowadays, this has become one of the most serious environmental problems. Methylene blue (MB) is the cationic dye commonly used for coloring. It is generally used for dyeing cotton, wool, and silk. MB can cause eye burns and irritation to the skin in humans and animals and if ingested, can cause irritation to the gastrointestinal tract, nausea, vomiting, and diarrhea [2]. Rhodamine B is a basic dye widely used as a colorant in textiles and food materials and as biological stains in biochemical laboratories at high concentrations. It causes irritation to skin, eyes and respiratory tract if ingested by animals and human beings [3]. Photocatalysis, an advanced oxidation technology employing semiconductors as photocatalysts, is a promising method for treatment of contaminated ground, surface, and wastewater containing various organic pollutants [4][5][6][7]. Various semiconductors such as ZnO [8], CdS [9] and TiO2 [10] have been used as photocatalysts. Among them, ZnO has become very well established in photocatalytic approaches as well as in the environmental catalysis area [11]. ZnO is a semiconductor with a wide band gap (3.3 eV), large exciton binding energy. It is abundant in nature and environment friendly. These characteristics make this material attractive for many applications such as solar cells, optical coatings, photocatalysts, antibacterial materials, electrical devices, active medium in UV semiconductor lasers and in gas sensors [12]. The photocatalytic activity of ZnO was recently recognized to be comparable with TiO2 and has received much attention because of its high photosensitivity and stability in degrading various toxic substances [11]. The mechanism of photocatalytic reaction is based on the generation of electron-hole pairs. When a photocatalyst is illuminated, the photo-excited electron migrates from the valence band (VB) to the conduction band (CB) and holes are formed in valence band; these holes can generate hydroxyl radicals, which are highly reactive and oxidizing in nature [13]. Activated carbon (AC) is a nontoxic and low cost adsorbent used for the removal of pollutants such as dyes and heavy metals from the waste water due to its high surface area, porous structure, large adsorption capacity and fast adsorption kinetics [14,15]. Composites consisting of ZnO supported on activated carbon have shown remarkable results in inhibiting bacteria growth [16] and removing metals from aqueous solutions [17]. Present study reports the photocatalytic performance of ZnO nanoparticles supported on cotton stalk activated carbon towards degradation of Methylene blue and Rhodamine B under sunlight irradiation. Activated carbon was prepared from cotton stalk by chemical activation using phosphoric acid as activating agent. ZnO photocatalyst and ZnO loaded activated carbons (ZnO/CSACs) were synthesised by chemical precipitation and were...

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Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

Marfur

Jaafar

2021

J Chinese Chemical Soc

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The impact of different light irradiation was studied on photocatalytic degradation of 2‐chlorophenol (2‐CP) using mesoporous titania nanoparticles (MTNs) prepared by microwave‐assisted methods. The photoactivity of MTNs was also compared with pretreated commercial TiO2 and Degussa P25 (P25). The reactions were conducted for 2.5 hr under UV‐A, UV‐C, sunlight, and visible light using a batch reactor. The catalysts were characterized by X‐ray powder diffractometer, UV–Vis diffuse reflectance spectroscopy, photoluminescence, Brunauer–Emmett–Teller method, field‐emission scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy. The characterization results confirmed that MTN consisted a composition of 21% rutile phase and 79% anatase phase with Ti3+ site defects (TSDs) and oxygen vacancies (OVs) in their structures because of their anionic surfactant nature, microwave heating, and high calcination temperature during the catalyst preparation. Besides, the photoactivity of MTN upon degradation of 2‐CP under sunlight has exhibited the best performance with 100% degradation followed by UV‐A, visible light, and UV‐C with degradation of 96, 52, and 39%, respectively. MTNs showed a remarkable performance due to their mixed‐phase crystalline structures as well as the formation of TSDs and OVs, which improved the charge migration, lowered the band gap energy, and reduced the rate of electron–hole recombination, thus succeeded to be activated under a wide range of light responses.

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Isomorphous substitution of Zr in the framework of aluminosilicate HY by an electrochemical method: Evaluation by methylene blue decolorization

Cited by 94 publications

References 63 publications

PERFORMANCE OF EGZrO2-EGFe2O3/HY AS PHOTOCATALYST AND ITS EFFICACY IN DECOLORIZATION OF DYE-CONTAMINANTS

PERFORMANCE OF EGZrO2-EGFe2O3/HY AS PHOTOCATALYST AND ITS EFFICACY IN DECOLORIZATION OF DYE-CONTAMINANTS

Enhanced Photocatalytic Performance of ZnO Loaded Cotton Stalk Activated Carbon Composite on MB and RHB Dyes Under Sunlight Irradiation

Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

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