Abstract
In recent years, the growing concern over the presence of toxic aquatic pollutants has prompted intensive research into effective and environmentally friendly remediation methods. Photocatalysis using semiconductor quantum dots (QDs) has developed as a promising technology for pollutant degradation. Among various QD materials, indium phosphide (InP) and its hybrid with zinc sulfide (ZnS) have gained considerable attention due to their unique optical and photocatalytic properties. Herein, InP and InP/ZnS QDs were employed for the removal of dyes (crystal violet, and congo red), polyaromatic hydrocarbons (pyrene, naphthalene, and phenanthrene), and pesticides (deltamethrin) in the presence of visible light. The degradation efficiencies of crystal violet (CV) and congo red (CR) were 74.54% and 88.12% with InP, and 84.53% and 91.78% with InP/ZnS, respectively, within 50 min of reaction. The InP/ZnS showed efficient performance for the removal of polyaromatic hydrocarbons (PAHs). For example, the removal percentage for naphthalene, phenanthrene, and pyrene was 99.8%, 99.6%, and 88.97% after the photocatalytic reaction. However, the removal percentage of InP/ZnS for pesticide deltamethrin was 90.2% after 90 min light irradiation. Additionally, advanced characterization techniques including UV–visible spectrophotometer (UV–Vis), photoluminescence (PL), X-ray diffractometer (XRD), energy-dispersive spectrometer (EDS) elemental mapping, transmission electron microscopy (TEM), and thermogravimetric analysis (TGA) were used to analyze the crystal structure, morphology, and purity of the fabricated materials in detail. The particle size results obtained from TEM are in the range of 2.28–4.60 nm. Both materials (InP and InP/ZnS) exhibited a spherical morphology, displaying distinct lattice fringes. XRD results of InP depicted lattice planes (111), (220), and (311) in good agreement with cubic geometry. Furthermore, the addition of dopants was discovered to enhance the thermal stability of the fabricated material. In addition, QDs exhibited efficacy in the breakdown of PAHs. The analysis of their fragmentation suggests that the primary mechanism for PAHs degradation is the phthalic acid pathway.
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Maryam Abbasi: investigation, formal analysis, writing — original draft. Rukhsanda Aziz: conceptualization, methodology, writing — review and editing, supervision. Muhammad Tariq Rafiq: writing — review and editing. Aziz Ur Rahim Bacha: data curation, writing (original draft preparation, reviewing, and editing). Zahid Ullah: writing — review and editing. Abdul Ghaffar: writing — review and editing. Ghulam Mustafa: writing — review and editing. Iqra Nabi: writing — review, editing and revision of manuscript. Malik Tahir Hayat: writing — review and editing. All authors read and approved the final manuscript.
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Abbasi, M., Aziz, R., Rafiq, M.T. et al. Efficient performance of InP and InP/ZnS quantum dots for photocatalytic degradation of toxic aquatic pollutants. Environ Sci Pollut Res 31, 19986–20000 (2024). https://doi.org/10.1007/s11356-024-32479-8
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DOI: https://doi.org/10.1007/s11356-024-32479-8