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Istiara Rizqillah Hanifah
Department of Materials Engineering, Faculty of Industrial Technology, Institut Teknologi Sumatera, Terusan Ryacudu, Way Hui, Jati Agung, Lampung Selatan 35365, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology

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Influence of Nb Dopant Concentration on the Structural Properties and Photocatalytic Performances of Hydrothermally Synthesized ZnO for Multi-Pollutant Degradation Quratul Aini; Carenina Isabel Suwono Putri; Rima Nurfitria; Istiara Rizqillah Hanifah
Greensusmater Vol. 3 No. 1 (2026)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/gsm.2026.01

Abstract

The development of effective photocatalysts for multi-pollutant wastewater remediation remains a significant environmental concern. In this study, Nb-doped ZnO photocatalysts with different Nb concentrations (0-6%) were synthesized using a hydrothermal process to systematically examine the influence of dopant concentration on materials characteristics and photocatalytic performance. According to X-ray diffraction analysis Nb incorporation preserved the hexagonal wurtzite ZnO structure with only slight lattice parameter changes, suggesting limited substitutional doping. Morphological observations showed that moderate Nb doping slightly enhanced particle structure and reduced agglomeration. The photocatalytic activity was evaluated through the degradation of ciprofloxacin (CIP) and methylene blue (MB) under UV irradiation, both in single and mixed pollutant systems. In single systems, the catalysts achieved high degradation efficiencies of up to 93.09% for CIP and 92.03% for MB after 120 min. In the mixed system, the efficiencies slightly decreased due to competitive interactions, reaching up to 87.57% (CIP) and 84.08% (MB). Kinetic analysis indicates pseudo-first-order behavior, with apparent rate constants (k) of approximately 0.0218 min<sup>−1</sup> (CIP) and 0.0199 min<sup>−1</sup> (MB) for the optimally doped Nb4-ZnO sample, which are comparable to those of pristine ZnO. The findings highlight the critical role of dopant concentration in tailoring structural and electronic properties, providing valuable insights into Nb-dopant optimization strategies for efficient multi-pollutant photocatalytic wastewater remediation.
Electrospun PAN/PVP/ZnO Nanofiber Membrane as a Photocatalyst for Methylene Blue Degradation under UV Irradiation Rut Rabekka Gultom; Istiara Rizqillah Hanifah; Rizky Aflaha; Hannah Faye M. Austria; T.M. Subrahmanya; Januar Widakdo; Aditya Rianjanu
Greensusmater Vol. 3 No. 1 (2026)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/gsm.2026.02

Abstract

Textile dye pollution remains a critical environmental concern, necessitating the development of efficient and recoverable photocatalysts for wastewater remediation. In this study, polyacrylonitrile/polyvinylpyrrolidone/zinc oxide (PAN/PVP/ZnO) nanofiber membranes were fabricated via electrospinning with varying ZnO loadings (0, 0.5, 1, and 2 mmol) and evaluated for the photocatalytic degradation of methylene blue (MB) under ultraviolet (UV) irradiation. Scanning electron microscopy (SEM) revealed continuous, bead-free nanofibers with mean diameters of 355–552 nm, and energy dispersive X-ray spectroscopy (EDS) confirmed systematic Zn incorporation up to 34.52 wt%. A comparative study demonstrated that heat treatment at 450 °C was essential for converting the Zn(NO<sub>3</sub>)<sub>2</sub> precursor into the photocatalytically active ZnO phase. X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) confirmed the retention of the polymer matrix integrity. Among the tested formulations, PAN/PVP/ZnO-1 (1 mmol) exhibited the highest photocatalytic performance, achieving approximately 95% MB degradation within 180 min, with a pseudo-first-order rate constant of k = 0.0251 min<sup>−1</sup> (R<sup>2</sup> = 0.9926), approximately 9 times faster than the neat PAN/PVP membrane. Higher ZnO loading (2 mmol) resulted in reduced photocatalytic performance. These findings indicate that 1 mmol ZnO is the optimal loading for PAN/PVP nanofiber photocatalysts, offering a promising recoverable membrane system for photocatalytic dye removal from wastewater.
Co-Authors Aditya Rianjanu Carenina Isabel Suwono Putri Hannah Faye M. Austria Januar Widakdo Quratul Aini Rima Nurfitria Rizky Aflaha Rut Rabekka Gultom T.M. Subrahmanya