Waste remediation: Low-temperature synthesis of hybrid Cu(OH) 2 /CuO and CuO nanostructures from spent printed circuit boards and their dye degradation studies.

Autor: Gautam P; Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi, 221005, India. pushpagautam.rs.met18@itbhu.ac.in., De AK; Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi, 221005, India., Rao MD; CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India., Sinha I; Department of Chemistry, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi, 221005, India., Behera CK; Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi, 221005, India., Singh KK; Department of Metallurgical Engineering, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi, 221005, India.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Jun; Vol. 31 (29), pp. 41624-41637. Date of Electronic Publication: 2023 Aug 04.
DOI: 10.1007/s11356-023-29005-7
Abstrakt: The demand for environmentally friendly and sustainable resource utilization techniques for recycling waste printed circuit boards is significant due to their status as valuable secondary resources, containing high-purity copper and precious metals. In this context, Cu(OH) 2 /CuO and CuO nanostructures were fabricated using alkaline precipitation and low-temperature aging methods using the strip solution originated from laboratory-scale spent mobile phone printed circuit board recovery process. XRD, FTIR, FESEM-EDX, and TEM were utilized to characterize the as-recovered nanoproducts. A hybrid structure of Cu(OH) 2 /CuO was formed at 70°, and monoclinic CuO phase was formed at 80 °C aging time. The results show that Cu(OH) 2 /CuO nanoflakes have an average crystallite size of 24.06 nm and a particle width of 22 ± 3 nm. Cu(OH) 2 /CuO nanoflakes formed at 70 °C aging temperature and 24-h residence time have finer crystallite and particle sizes than CuO-ridged nanospheres formed at 80 °C aging temperature. The optical band gap energy of Cu(OH) 2 /CuO and CuO nanostructures formed was found to be 2.28 eV and 2.22 eV, respectively. The hybrid Cu(OH) 2 /CuO nanostructure photocatalyzed the decomposed 97.28% rhodamine blue using a visible light source, whereas the CuO nanostructure degraded only 14.64% rhodamine blue dye under similar conditions. A surfactant-less hybrid structure is developed without the use of any chemical precursor. Thus, a high value-added product is produced using one waste material to remove another waste in wastewater treatment.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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