CuO-ZnO-CdWO4: a sustainable and environmentally benign photocatalytic system for water cleansing

Fatima, Bushra; Siddiqui, Sharf Ilahi; Ahmad, Rabia; Linh, Nguyễn Thị Thùy; Thai, Van Nam

doi:10.1007/s11356-021-14543-9

Cited by 16 publications

(37 citation statements)

References 62 publications

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“…The data obtained from the Match program and their interpretations are listed in Table 1. A similar result was reported for our previous study [17]. This data analysis and interpretation suggest the presence of CuO, ZnO, and CdWO 4 crystal system in the prepared sample.…”

Section: Characterizationsupporting

confidence: 92%

“…As per our previous research [17], Cu-Zn binary oxide coupled CdWO 4 nanocomposite was synthesized with slight modification in calcination temperature. Briefly, 100 mL of 0.4 mol L −1 Cu(CO 2 CH 3 ) 2 .2H 2 O anhydrous aqueous solutions and 100 mL of 0.4 mol L −1 Zn(CH 3 CO 2 ) 2 (H 2 O) 2 aqueous solutions were mixed, and then stirred at 60-70 • C at 850 rpm for 45 min on a magnetic stirrer.…”

Section: Methods Green Synthesis Of Adsorbentmentioning

confidence: 99%

“…Therefore, the aim of the present study can be classified into the following parts: (a) to synthesize the Cu-Zn binary oxide coupled CdWO 4 composite, (b) to characterize prepared composite, (c) to investigate the effect of adsorbent dose, contact time, solution pH and temperature for adsorption of CR dye from lab prepared aqueous solution, (d) to investigate the initial concentration of CR on adsorption performance of composite, (e) to study the isotherms and thermodynamics in order to identify the adsorption mechanism, (f) to study the kinetics and rate determining step of adsorption, and (g) to analyze the true adsorption performance by partition coefficient. In a previous study, a photocatalytic application of copper oxide and zinc oxide coupled cadmium tungstate was reported for Congo red dye degradation [17]. This is the first reported work in which Cu-Zn binary oxide coupled CdWO 4 has been investigated for CR dye removal through adsorption.…”

Section: Introductionmentioning

confidence: 95%

“…This material was prepared with a green method using plant extract. The couplings of MS and MO with CdWO 4 have shown advantageous properties (such as nominal cost and ease of production, environmentally benign, high surface properties, and narrow band gap) over other NMs and virgin CdWO 4 [14][15][16][17]. All these materials prominently displayed photocatalytic properties and showed better ability than virgin.…”

Section: Introductionmentioning

confidence: 99%

“…With this aim, the green synthesis of Cu-Zn binary oxide coupled CdWO 4 using aqueous extract of Brassica Rapa leaves is reported. Brassica Rapa leaves contain abundant phytochemicals, which have proved to be a great functionalizing agent [17].…”

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of Cu-Zn Binary Oxide Coupled Cadmium Tungstate (Cu-ZnBO-Cp-CT) with Enhanced Performance of Dye Adsorption

Fatima

Alwan

Siddiqui

et al. 2021

Water

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This study reports the synthesis of copper–zinc binary oxide coupled cadmium tungstate through a simple bio-precipitation method followed by calcination at 600 °C and its adsorption application. The characterization analysis reveals that the prepared composite has low particles size (nano-range), high porosity, and functional groups on the surface. The calcination of sample at 600 °C causes some essential function groups to disappear on the surface. Prepared composite was found to be effective adsorptive material to treat Congo red dye in aqueous solution. 2.5 g L−1 dose of adsorbent could remove more than 99% Congo red dye from 10 mg L−1 solution and more than 80% Congo red dye from 60 mg L−1 aqueous solution. The maximum adsorption capacity of present adsorbent was calculated to be 19.6 mg Congo red per gram of adsorbent. Isotherms analysis suggested a physio-chemical adsorption process. Thermodynamic analysis revealed a exothermic and feasible adsorption process. Adsorption rate was well explained by pseudo second order kinetics. The rate determining step was intra-particle diffusion evaluated from the Weber-Morris plot. To assess the adsorption performance of present adsorbent for Congo red dye the partition coefficient and adsorption equilibrium capacity were compared with other adsorbents. The partition coefficient and adsorption equilibrium values for 10 mg L−1 aqueous solution were found to be approximately 83.3 mg g−1 µM−1 and 4.0 mg g−1 at 30 °C and 7.0 pH using 2.5 g L−1 adsorbent. The value of partition coefficient was found to be higher than previous reported zinc oxide coupled cadmium tungstate having partition coefficient = as 21.4 mg g−1 µM−1 at 30 °C and 7.0 pH using 2.0 g L−1 adsorbent. These results suggested that present adsorption technology is efficient for wastewater treatment.

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Section: Characterizationsupporting

confidence: 92%

Section: Methods Green Synthesis Of Adsorbentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%