U-PEO:CuZnAl as a Recyclable Bifunctional Composite for Absorption/Degradation of Azo-Dyes

Palácio, Gustavo; Piza, Camila T.; Batista, Maria L.; Santos, Caio C. dos; Pukinellia, Sandra H.; Santilli, Celso V.

doi:10.21577/0103-5053.20240095

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Article • J. Braz. Chem. Soc. 35 (11) • 2024 • https://doi.org/10.21577/0103-5053.20240095 copy

U-PEO:CuZnAl as a Recyclable Bifunctional Composite for Absorption/Degradation of Azo-Dyes

Authorship SCIMAGO INSTITUTIONS RANKINGS

The catalytic activity of layered double hydroxide (LDH) and the aqueous solution absorption capacity of ureasil polyethylene oxide (U-PEO) were combined to produce an easily recyclable solid-liquid (S-L) reactor (U-PEO:LDH). Scanning electron microscopy (SEM), X-ray diffraction (XRD) and small-angle X-ray scattering (SAXS) of LDH (CuZnAl), U-PEO, and U-PEO:LDH confirmed the layered structure of the catalyst and evidenced its inclusion in the free volume of U-PEO matrix. The catalytic activity of the CuZnAl in the composite prepared with different amounts of LDH, towards degradation of the Acid Blue 29 (AB29) dye by a heterogeneous Fenton-like process was investigated, and the results evidenced a maximum efficiency (96%) for composite with 10 wt.% of LDH. Recyclability assessments demonstrated that the superior performance of the U-PEO:LDH reactor was sustained over several cycles (4). The U-PEO:LDH reactor proposed in this work has excellent potential as a heterogeneous catalyst for effective dye removal in environmental applications.

Keywords:
hybrid materials; LDH; Fenton-like reactions; heterogeneous catalyst

Catalyst	Pollutant concentration	Experimental conditions	Removal efficiency	Reference
CuNiFeLa-LDH La:(Fe + La) = 0.1	florfenicol 10 mg L⁻¹	5 mmol L⁻¹ of H₂O₂ and 0.25 g L⁻¹ of catalyst in 50 mL of florfenicol solution at neutral pH	95% after 180 min	13
MgFe-LDH Mg:Fe = 3 MnMgFe-LDH	methylene blue 20 mg L⁻¹	H₂O₂ (20 wt.%) and 0.03 g of catalyst in 10 mL of water	80% for MnMgFe and 75% for MgFe after 5 cycles	26
Cu₁Ni₂Sn_0.75 LDH	phenol 100 mg L⁻¹	H₂O₂ (30 wt.%) and 0.1 g of catalyst in 100 mL phenol solution, T = 50 °C	97%	37
CuAl-LDH/carbon fiber composites Cu:Al = 2	ammonia nitrogen 25 mg L⁻¹	visible light irradiation, H₂O₂ and catalyst dosage variable, optimum pH = 8	95% for CuAl-LDH and 98% for CuAl/CF-LDH, 80% after 10 cycles	38
Cu_xNi_yCo-LDH ((Cu+Ni):Co = 3) nanosheets supported GO	tetracycline 20 mg L⁻¹	10 mmol L⁻¹ of H₂O₂ and 60 mg L⁻¹ of catalyst at pH = 10.2	96% in 40 min and 80% after 5 cycles	39
CuMgFe-LDH (Mg:Fe = 3)	sulfathiazole 150 µg L⁻¹	H₂O₂: 0, 2, 4, and 6 mmol L⁻¹ and catalyst: 0.2-1.0 g L⁻¹ at pH = 7.5	100% in 90 min	40

U-PEO:xCuZnAl (x / %)	T_g / ºC	ΔH_m / (J g⁻¹)	D_c / %	T_m / ºC
0	−43	44	23	28
7	−43	37	19	27
10	−45	34	17	22
20	−52	28	14	21
30	−52	24	12	19

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[1] * e-mail: cv.santilli@unesp.br