Efficient photo catalysts based on silver doped ZnO nanorods for the photo degradation of methyl orange

Bhatti, Muhammad Ali; Shah, Aqeel Ahmed; Almani, Khalida Faryal; Tahira, Aneela; Chalangar, Ebrahim; Chandio, Ali Dad; Nur, Omer; Willander, Magnus; Ibupoto, Zafar Hussain

doi:10.1016/j.ceramint.2019.08.027

Cited by 59 publications

(23 citation statements)

References 56 publications

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“…In turn, the cationic dyes (due to chemical groups such as the amine or sulfur) have a net positive charge [3]. The methyl orange dye (anionic dye) has high toxicity, a mutagenic and carcinogenic nature [4], a hard-breaking molecular structure [5], and difficult adsorption in different materials. On the other hand, methylene blue (cationic dye) does not have high toxicity but may cause harmful effects on human health, such as vomiting, increased heart rate, diarrhea, and cyanosis [6].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

et al. 2020

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The efficiency of acid treatment on natural calcium bentonite (natural bentonite) for anionic dye adsorption was investigated using methyl orange (MO) as a probe. Additionally, adsorption experiments were accomplished between the natural bentonite, acidified bentonite, and a cationic dye (methylene blue, MB). Acid functionalization in natural bentonite (RF) was carried out with HCl and H2SO4 acids (RF1 and RF2, respectively). The samples were characterized by chemical analysis, mineralogy, particle size, and thermal behavior with the associated mass losses. The adsorption efficiency of MO and MB dyes was investigated by the effects of the initial concentration of adsorbate (Ci) and the contact time (tc). The acid treatment was efficient for increasing the adsorption capacity of the anionic dye, and the Qmaxexp values measured were 2.2 mg/g, 67.4 mg/g e 47.8 mg/g to RF, RF1 e RF2, respectively. On the other hand, the acid functionalization of bentonite did not significantly modify the MB dye adsorption. The Sips equation was the best fit for the adsorption isotherms. Thus, we found that the acid-functionalized bentonite increases the anionic dye adsorption by up to 8000%. The increased adsorptive capacity of acidified bentonite was explained in terms of electrostatic attraction between the clay surface and the dye molecule.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

et al. 2020

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“…In comparison to other oxide semiconductors, ZnO has many superior properties such as light sensitive, thermal and chemically stable, low cost, nontoxic, and sustainable with hydrogen environment [3]. The ZnO-based materials have many applications in industries, for example, rubbers, ceramics, pharmaceuticals, agricultural servants, paints, cosmetics, and photocatalysts [4][5][6][7][8][9][10]. Besides the advantages of this material due to the high electron aperture rate and low charge separation efficiency [11], the pure ZnO often exhibits relatively low photocatalytic activity under visible light irradiation, and therefore, ZnO does not meet the requirements of a photocatalyst when applied to practical processes [3,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…There have been many studies on synthesizing ZnObased materials to decompose toxic organic substances in wastewater [9,[34][35][36][37], in which ZnO/TiO 2 and ZnO/rGO-rGH showed the effective materials of degrading BPA under UV irradiation [38,39]. However, the use of UV light can affect the ecosystem as well as it is much more expensive than using visible light.…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of ZnO Nanoparticles and Ag/ZnO Nanocomposite and Their Photocatalytic Activities under Visible Light

Pham

Tran

et al. 2020

International Journal of Photoenergy

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Zinc oxide (ZnO) has been known as an excellent photocatalyst for the degradation of a variety of organic pollutants under UV irradiation. This work describes a synthesis of ZnO nanoparticles via a facile precipitation method, and Ag was doped into Ag/ZnO nanocomposite to improve the photocatalytic degradation of BPA under visible light irradiation. The obtained ZnO nanoparticles were 20 nm in size and had a relatively high surface area and pore volume, 26.2 m2/g and 0.48 cm3/g, respectively. The deposition of Ag led to a decrease in the surface area, pore volume, and band gap energy ( E g ) of ZnO nanoparticles. However, the photocatalytic activity of Ag/ZnO composite in the case increased. The performance of ZnO was compared with Ag/ZnO composites at the different molar ratios, and the kinetic reaction of BPA in these catalysts was investigated by the first-order kinetic model. The sample of Ag/ZnO-10 composite had the highest catalytic activity and showed the degradation efficiency, reaction rate, and degradation capacity of 100% in 120 min, 0.014 min-1, and 40 mg/g, respectively. In comparison, the effects of Ag/ZnO molar ratio, catalyst dosage, solution pH, and concentration of BPA on photocatalytic degradation were investigated. Additionally, the photocatalytic performance of Ag/ZnO-10 composite was evaluated by the degradation of other persistent organic compounds such as phenol, tartrazine, and methylene blue and compared to other catalysts in literature.

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“…), such as zinc oxide (ZnO), titanium oxide, and tungsten oxide, have already proven to be powerful photocatalysts [8]. ZnO in particular is known for its low cost, water de-toxification abilities, high reaction and mineralization rates, and large number of active sites that enhance degradation of dyes under ultraviolet (UV) illumination [9][10][11]. ZnO nanoparticles (NPs) have attracted research attention due to their low cost, low environmental impact, and rapid degradation of toxic dyes from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Zinc Oxide Nanoflower Photocatalyst from Sea Buckthorn Fruit for Degradation of Industrial Dyes in Wastewater Treatment

et al. 2019

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Green synthesis of ZnO nanoparticles has attracted research attention as a sustainable method of avoiding the destructive effect of chemicals. We synthesized a flower-shaped zinc oxide (ZnO) nanoflower (NF) from sea buckthorn fruit (SBT) by co-precipitation and characterized it using X-ray powder diffraction (XRD), X-ray photo electronic microscopy (XPS), photoluminescence (PL), field emission transmission electron microscopy (FE-TEM), and Fourier-transform infrared (FT-IR) spectroscopy. The ability of the ZnO/NF to degrade cationic and anionic dyes, including malachite green (MG), Congo red (CR), methylene blue (MB), and eosin Y (EY), under ultraviolet illumination was studied. The photocatalyst degraded approximately 99% of the MG, MB, CR and EY dyes within 70, 70, 80, and 90 min of contact time, respectively, at a dye concentration of 15 mg/L, 5 mg/L, SBT-ZnO/NF degraded 100% of the MG, MB, CR and EY dyes within 23, 25, 28, and 30 min, respectively. The results indicate that SBT-ZnO/NFs as synthesized is an inexpensive, non-toxic, rapid, and reusable photocatalyst that can play an enhanced role in wastewater treatment.

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Efficient photo catalysts based on silver doped ZnO nanorods for the photo degradation of methyl orange

Cited by 59 publications

References 56 publications

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

Facile Preparation of ZnO Nanoparticles and Ag/ZnO Nanocomposite and Their Photocatalytic Activities under Visible Light

Synthesis of a Zinc Oxide Nanoflower Photocatalyst from Sea Buckthorn Fruit for Degradation of Industrial Dyes in Wastewater Treatment

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