Introduction of CdO nanoparticles into graphene and graphene oxide nanosheets for increasing adsorption capacity of Cr from wastewater collected from petroleum refinery

Bukhari, Aysha; Ijaz, Irfan; Zain, Hina; Mehmood, Uqba; Iqbal, Mudassar; Gilani, Ezaz; Nazir, Ammara

doi:10.1016/j.arabjc.2022.104445

Cited by 19 publications

(4 citation statements)

References 65 publications

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“…The Raman spectra corroborated the formation of the ZCCO NC. The bands, as shown in figure 2, depict E2 (High) band at 435.80 cm -1 as the fingerprint region of the Wurtzite ZnO, (2LA) mode at 457.92 cm −1 , (LA + LO) mode at 894.37 cm −1 and (TO + LO) mode at 1020-1085 cm −1 all these correspond to ZnO phase [20] whereas CuO related bands were indexed at 282.10 and 296.10 (Ag)cm −1 , 672.63 cm −1 (B2g) cm −1 [21], and CdO related bands indexed at 253.8 cm −1 (TA+TO), and there are five peaks in the series of 765-965 (2LO) cm −1 [22]. The observed modifications are concerned with the intensity and peak shifting because of the structural imperfections formed by the interaction between all the ternary materials Zn, Cd and Cu oxides.…”

Section: Raman Spectrocopymentioning

confidence: 97%

Low cost ternary metal oxide based nanocomposites as a room temperature formaldehyde sensor

Krishna,

Parne,

Pothukanuri

2023

Phys. Scr.

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To protect human health from hazardous gases, it is necessary to rapid detection of toxic gases utilizing gas sensors. Though there are various gas sensors, despite that, they endure inaccuracy in selectivity and sensitivity in the real-time monitoring of the low concentration of gases. In this context, the practical design for developing a cost-effective formaldehyde (HCHO) sensor using a hetero-type ternary nanocomposite ZnO/CdO/CuO (ZCCO) metal oxide (MOX) materials with porous structure is an ideal choice. In this study, ZCCO heterostructures demonstrated rapid selectivity towards HCHO compared with other volatile organic compounds and exhibited excellent long-term stability for up to 80 days. The sensor capability has been further improved with the heterostructures' porous morphology, greater specific surface area, huge reaction sites, and electron sensitization effects of highly dispersed nanocomposite material. This work reports the Lowest Detection Limit (LDL) towards HCHO at room temperature as 500 ppb. These heterostructures enable the charge transport mechanism between the interparticle ZnO/CdO (n–n junctions) and the ZnO/CuO (n–p junctions) that can simultaneously enhance the sensitivity of the gas molecule's reactions.

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Section: Raman Spectrocopymentioning

confidence: 97%

Low cost ternary metal oxide based nanocomposites as a room temperature formaldehyde sensor

Krishna,

Parne,

Pothukanuri

2023

Phys. Scr.

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“…At an optimal pH of 5.7 with about 80% activated carbon column packing, a 96.70% COD removal efficiency was recorded after 76 min. Bukhari et al [89] have reported the composite adsorption ability of graphene oxide nanocomposites with cadmium oxide (CdO). At an adsorbent dosage of 1.3 g/L and pH 5, a Cr +6 efficiency of 98% was obtained.…”

Section: Adsorption Using Conventional Adsorbentsmentioning

confidence: 99%

Recent Advancements in the Treatment of Petroleum Refinery Wastewater

Lawan,

Kumar,

Rashid

et al. 2023

Water

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The treatment of petroleum refinery wastewater (PRWW) is of great interest in industrial wastewater management. This wastewater contains a diverse concentration of contaminants such as oil and grease, petroleum hydrocarbons, phenols, ammonia, and sulfides, as well as other organic and inorganic composites. Refinery wastewater treatment has been attempted through various processes, including physical, biological, chemical, and hybrid methods, which combine two or more techniques. This review aims to summarize current research studies involved in the treatment of petroleum refinery wastewater using conventional, advanced, and integrated treatment techniques. Furthermore, it critically highlights the efficiencies and major limitations of each technique and the prospects for improvements. Several conventional treatment techniques (basically, the physicochemical and biological processes) are discussed. In this context, advanced oxidation processes (AoPs), especially electrochemical oxidation and photocatalysis, as well as integrated/hybrid processes are found to be effective in removing the recalcitrant fraction of organic pollutants through their various inherent mechanisms. These techniques could effectively remove COD and phenol concentrations with an average removal efficiency exceeding 90%. Hence, the review also presents an elaborate discussion of the photocatalytic process as one of the advanced techniques and highlights some basic concepts to optimize the degradation efficiency of photocatalysts. Finally, a brief recommendation for research prospects is also presented.

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“…MnFe 2 O 4 [57,59], sulfonated magnetic [60,61], and Fe 3 O 4 [57,[62][63][64][65][66] were added to the graphene oxide adsorbents, making it easier for them to be trapped from the medium with the help of an external magnetic field. To improve effectiveness of heavy metal removals, scientists have added other materials including Chitosan [67][68][69], Cds [70], silica [71,72], Mg(OH) 2 [73], and CdO [74] to GO nanosheets. Due to its impressive properties, graphydine, a new type of carbon allotrope made up of sp-and sp 2 -hybridized carbon atoms, has attracted significant interest.…”

Section: D Nanosheets Used For Heavy Metal Removal 21 Carbon Products...mentioning

confidence: 99%

Heavy Metals Adsorption by Nanosheet: Mechanism and Effective Parameters

Arabi¹,

Ahangari²

2023

Advances in Nanosheets [Working Title]

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Nowadays, scientists are working on removing heavy metals from the environment. Among the methods for heavy metals removal such as precipitation, evaporation, electroplating and ion exchange, which have many disadvantages, adsorption is the cost effective and environmental friendly technique. Using nanosheets as the base materials for the adsorption because of their large surface area and high adsorption capacity is broadened. Carbon products (Graphene), boron nitride materials (BNM), transition metal dichalcogenides (TMDs), layered double hydroxiades (LDHs) and MXene are most well-known nanosheets, which have used for heavy metal ions removal from aqueous solutions. In this review, experimental and simulation studies on nanosheet adsorbents are presented to pinpoint the importance of this group of nano-materials on water/wastewater treatment technology. Molecular dynamics (MD) and density functional theory (DFT) are the most common simulation methods for demonstration of adsorption mechanism of nanosheets. In addition, synthesis methods, adsorption mechanism, adsorption performance, and effective parameters of nanosheets and novel techniques to improve the adsorption capability and regeneration of adsorbents are introducing. This study indicate that nanosheets can regenerate over a number of adsorption/desorption cycles. With all the advantages of nanosheets, it should be noted that their use in larger industrial scales should be further investigated.

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Introduction of CdO nanoparticles into graphene and graphene oxide nanosheets for increasing adsorption capacity of Cr from wastewater collected from petroleum refinery

Cited by 19 publications

References 65 publications

Low cost ternary metal oxide based nanocomposites as a room temperature formaldehyde sensor

Low cost ternary metal oxide based nanocomposites as a room temperature formaldehyde sensor

Recent Advancements in the Treatment of Petroleum Refinery Wastewater

Heavy Metals Adsorption by Nanosheet: Mechanism and Effective Parameters

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