Green synthesis of flower-shaped copper oxide and nickel oxide nanoparticles via capparis decidua leaf extract for synergic adsorption-photocatalytic degradation of pesticides

Amna Iqbal, Atta Ul Haq, Gabriel Antonio Cerrón-Calle, Syed Ali Raza Naqvi, Paul Westerhoff, Sergio GARCIA SEGURA

Research output: Contribution to journalArticlepeer-review

Abstract

Green manufacturing of catalysts enables sustainable advanced oxidation processes and water treatment processes for removing trace contaminants such as pesticides. An environmentally friendly biosynthesis process produced high-surface-area CuO and NiO nanocatalysts using phytochemicals in the Capparis decidua leaf extract, which served as a reductant and influenced catalyst shape. Capparis decidua is a bushy shrub, widely distributed in dry and arid regions of Africa, Pakistan, India, Egypt, Jordan, Sudan, Saudi Arabia. The synthesized CuO and NiO nanoparticles were characterized by UV-vis spectroscopy (UV-vis), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD) and thermo-gravimetric analysis/differential thermal analysis (TGA/DTA). The produced nanoparticles were spherical and flower-like in shape and have a characteristic facecentered cubic structure of CuO and NiO. Biosynthesized catalysts were photoactive and degraded recalcitrant pesticide Lambda-cyhalothrin (L-CHT). Photocatalytic degradation of L-CHT was affected by the initial L-CHT concentration, solution pH levels between 5 and 9, and photocatalyst concentration. The L-CHT removal percentage attained by CuO photocatalyst (~99%) was higher than for NiO photocatalyst (~89%). The degradation of L-CHT follows a pseudo-first-order kinetic model, and the apparent rate constant (kapp ) decreased from 0.033 min−1 for CuO to 0.0084 min−1 for NiO photocatalyst. The novel flower-shaped nanoparticles demonstrated high stability in water and recyclability for removing L-CHT pesticide contamination in water.

Original languageEnglish (US)
Article number806
JournalCatalysts
Volume11
Issue number7
DOIs
StatePublished - Jul 2021

Keywords

  • Advanced oxidation processes
  • Capparis decidua
  • Green synthesis
  • Persistent organic pollutants
  • Photocatalysis
  • Semiconductor catalysts
  • Water treatment

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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