Chemical Engineering, Filtration and Separation, Process Chemistry and Technology, General Environmental Science
37
Scopus Publications
Scopus Publications
Preparation and characterization of low-cost chemically activated carbons using H3PO4, ZnCl2 and KOH for CO2 adsorption applications Marziyeh Bandani, Mahsa Najafi, Soodabeh Khalili, Mohsen Jahanshahi, Majid Peyravi, Hossein Salmani Scientific Reports, 2026 In the present research, Parrotia Persica wood was used as a low-cost precursor to developing activated carbons (ACs) for CO2/N2 separation. The adsorbents were prepared using the chemical activation procedure employing different activating agents, namely H3PO4, ZnCl2, and KOH, at various impregnation ratios (1, 2, 3) and carbonizing temperatures (500, 650, and 800 °C). The pore structures, morphology, and CO2 selectivity of the fabricated adsorbents were evaluated. ZnCl2-activated carbon (ACZn1) exhibited the highest specific surface area of 1925 m2.g− 1, while H3PO4-activated carbon (ACH3) demonstrated higher CO2 uptake of 25.848 mmol.g− 1 estimated based on the Sips model at 298 K, due to its excellent pore volume (1.351 cm3.g− 1). The estimated IAST CO2/N2 selectivity under the environmental conditions for ACH3, ACZn1, and ACK1-Char adsorbents was 19.64, 20.24, and 9.34, respectively.
N-ZnO/g-C3N4/GO Photocatalytic Membranes for Efficient Methylene Blue Degradation Zeynab Habibollahi, Majid Peyravi, Soodabeh Khalili, Mohsen Jahanshahi Applied Organometallic Chemistry, 2026 In this study, N‐ZnO/g‐C 3 N 4 /GO nanocomposites were successfully fabricated via the coprecipitation method. Characteristics of synthesized photocatalysts were analyzed using FTIR, XRD, FESEM, EDX mapping, TEM, and PL. The photocatalytic performance of the synthesized nanoparticles was evaluated for the degradation of methylene blue (MB) under visible light. The N‐ZnO/g‐C 3 N 4 /GO nanocomposite exhibited significantly enhanced performance, achieving 91% MB degradation within 60 min, whereas pure ZnO degraded only 25.38% after 90 min. Incorporating the synthesized photocatalysts into the dynamic membrane had a significant effect on the rejection rate of MB and permeation flux. While the pure PES membrane rejected only 30% of MB, the self‐forming dynamic membrane (SFDM) and precoated dynamic membrane (PCDM) containing the nanocomposite achieved > 85% and ~98% degradation within 15 and 10 min, respectively. These results demonstrate a strong synergistic effect between the photocatalyst and the dynamic membrane, leading to substantially improved dye removal and permeation performance.
Photocatalytic Dynamic Membrane Containing Graphitic Carbon Nitride/Zirconium dioxide Nanocomposite for MB and CR Dye Removal under Household LED Lamp Marjan Tanzifi, Mohsen Jahanshahi, Majid Peyravi, Soodabeh Khalili Journal of Water and Environmental Nanotechnology, 2023 Dye-containing wastewater is a major pollutant that can irreversibly damage the environment. Ultrafiltration membrane technology combined with photocatalysis is used for treatment of dye-containing solutions. To remove dye pollution, Methylene blue (MB) and Congo red (CR), graphitic carbon nitride (CNG) and its zirconium dioxide nanocomposite (CNGZ) were used in the photocatalytic dynamic membrane system in both self-forming and pre-coated modes under household LED light. The filtration results of the self-forming membrane showed that the pure CNG- and nanocomposite-based photocatalytic membrane systems were more efficient for MB and CR dyes removal than the photocatalytic system in batch mode. In addition to improving dye molecule removal efficiency, adding the photocatalyst to the PES membrane also significantly increased water flux. Moreover, the respective MB and CR rejection rates were 29% and 47% for the pure PES membrane and 89% in 120 min and 100% in 80 min for the CNGZ-based photocatalytic membrane. This suggests that the photocatalytic membrane system is a more effective dye pollution remover than the pure PES. For comparison, the pre-coated dynamic membrane system used for MB dye removal was good for removing 98.6% within 20 min. The results suggest that CNGZ-based photocatalytic dynamic membrane is a promising technology for increasing dye molecules removal efficiency and flux in remediation of dye-containing wastewater.
