Investigation of adsorptive removal of heavy metals onto magnetic core–double shell nanoparticles: kinetic, isotherm, and thermodynamic study

Materials Research Express, Journal Year: 2024, Volume and Issue: 11(4), P. 045003 - 045003

Published: March 25, 2024

Abstract The most perilous environmental hazards arise from the contamination of water by heavy metal ions, owing to non-biodegradability these metals, as well their rapid dissemination throughout components environment via food chain. Nano-based adsorbents have been used for adsorption removal many cations, but separating and recycling them represent significant difficulties in processing. Magnetic core–double shell nanoparticles provide an attractive solution processing issues, since they are stable can be easily separated recycled. Moreover, thickness, composition, porosity tuned. In this work, two samples consisting magnetic core@TiO 2 @mesoSiO with thicknesses (Mag-T-S-0.2 Mag-T-S-0.4), along a core@SiO @TiO nanoparticle sample (Mag-S-T), were synthesized characterized TEM, XRD, strength measurement zeta potential. TEM images show developed structure double ranging 60 73 nm. XRD results indicate impact outer on diffraction pattern. potential shows that all had negative charge at pH over 4. character was suppressed after formation double-shell coating; however, still magnetization could when external field applied. adsorptive ability Mag-T-S-0.2, Mag-T-S-0.4, Mag-S-T explored investigate effects type thickness kinetic, isotherm, thermodynamic study. investigated metals included Cd(II), Ni(II), Mn(II), Pb(II), Cu(II). that, equilibrium state occurred 15 min contact time, capacity 238, 230, 210.6, 181.8, 245.8 mg/g Cu(II), respectively. For 241, 237.6, 173.8, 189.6, 257.2 mg g −1 , Mag-S-T, 25 137.8, 131.4, 221, 149.4 When pseudo-first-order pseudo-second-order kinetic models applied time interval data samples, second-order model found more suitable describing process, indicating fast mechanism. did not fit Langmuir model, while Freundlich suggesting heterogeneous material surfaces multi-layer adsorption. Thermodynamic investigations confirmed spontaneous nature removal, which helps promote effective wastewater treatment.

Language: Английский

Overcoming barriers and embracing advances: Nanosensor implementation for practical water contaminant surveillance

One Earth, Journal Year: 2024, Volume and Issue: 7(8), P. 1351 - 1361

Published: Aug. 1, 2024

Language: Английский

The effects of RT-qPCR standards on reproducibility and comparability in monitoring SARS-CoV-2 levels in wastewater

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: Oct. 26, 2024

Reverse transcription-quantitative PCR (RT-qPCR) is widely used for monitoring viruses, including severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), in wastewater. Various materials, plasmid DNA, synthetic nucleic acids, amplicons, genomic and cDNA, are currently SARS-CoV-2 quantification by generating standard curves. We assessed three common standards on quantifying RNA across nine wastewater treatment plants Finland, as part of the national surveillance effort. pairwise compared RT-qPCR results from 148 samples, using both IDT (#10006625, IDT, USA) CODEX (#SC2-RNAC-1100, DNA), 179 samples EURM019 (#EURM-019, European Commission, Joint Research Centre) our assessment. Amongst tested standards, consistently yielded more stable than either or standards. found that levels were higher with (4.36 Log

Language: Английский