The effects of magnetic nanoparticles embedded with SA/PVA and pH on chemical-mechanical polishing wastewater and magnetic particle regeneration and recycle

Huang, Chung-Fu; Huang, An‐Chi; Hsieh, Yih Shou; Chu, Feng-Jen; Wan, Terng-Jou

doi:10.1016/j.wri.2017.06.001

Cited by 13 publications

(10 citation statements)

References 44 publications

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“…Naked iron oxide Fe 3 O 4 magnetic nanoparticles were immobilized in PVA and SA according to the method described by Huang et al [20]. Briefly, 8 g of PVA and 2 g of SA were dissolved into 90 mL of diluted water and then autoclaved (TM-321, Tomin, New Taipei City, Taiwan) at 1.2 kg cm −2 (15 psi), at 121 • C, for 20 min.…”

Section: Fe 3 O 4 /Ps Preparationmentioning

confidence: 99%

“…Figure 1b shows the individual microsphere of Fe 3 O 4 /PS exhibiting paramagnetism (Figure 1c,d). Huang et al [20] reported that the coercive force of the magnetization hysteresis loop of Fe 3 O 4 /PS was 5 emu/g, indicating that the Fe 3 O 4 /PS had a magnetic response and separation capability. Those results indicate that Fe 3 O 4 immobilized by PVA and SA not only reduces the risk of water recycling with toxic materials but also facilitates magnet recovery.…”

Section: Fe 3 O 4 /Ps Characteristicsmentioning

confidence: 99%

“…The immobilization of iron oxide (Fe 3 O 4 ) nanocomposites within polyvinyl alcohol (PVA) and sodium alginate (SA) is a safe process that is widely used in other applications, such as wastewater treatment [19][20][21], pharmaceuticals, [22,23], and immobilized lipase for biodiesel production [24].…”

Section: Introductionmentioning

confidence: 99%

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Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads

Chu

Wan

Chen

et al. 2020

Water

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In this work, the harvesting of Nannochloropsis oculata microalgae through the use of nanosized Fe3O4 immobilized in polyvinyl alcohol (PVA)/sodium alginate (SA) as a flocculant (Fe3O4/PS) is investigated. Using the Fe3O4/PS immobilized beads could reduce the amount of soluble ferrous ions (Fe2+) released from naked Fe3O4 in acid treatment, leading to easy recovery. The characterization was performed under different dosages and pH values of Fe3O4/PS. The results show that the Fe3O4/PS, when applied to the algae culture (500 mg dry cell weight/L), achieves a 96% harvesting efficiency under conditions of a pH of 4 with 200 mT magnetic field intensity. Fe3O4/PS can be directly reused without adjusting the pH value. The recycled Fe3O4/PS shows stability in terms of its surface properties, maintaining more than 80% harvesting efficiency after five recycles. Magnetophoretic harvesting, using immobilized magnetic iron oxide as a particle-based flocculant, is a potential method to reduce challenges related to the cost-effective microalgae-harvesting method.

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Section: Fe 3 O 4 /Ps Preparationmentioning

confidence: 99%

Section: Fe 3 O 4 /Ps Characteristicsmentioning

confidence: 99%

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Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads

Chu

Wan

Chen

et al. 2020

Water

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“…The results indicated that the intensity of the peaks (at 3600-3300 cm -1 ) and (at 3191-2898 cm -1 ) was slightly reduced. It was might be due to the space occupied by PMNPs (Huang et al, 2017). An absorption peak was grown (at 489 cm -1 ), and it can be appointed to Fe-O, confirming the existence of PMNPs in the PVA-SA mixture (Ali et al, 2018a(Ali et al, , 2018b.…”

Section: Ftir Powder Xrd Tga and Edx Analysesmentioning

confidence: 99%

“…Meantime, the intensity of characteristic peaks of -OH and -COH was also reduced, indicating the formation of uniform, dense and compact egg-shaped BMMC. (Huang et al, 2017). Hence, GA performed as a 'knot' or 'joint' to combine SA and PVA together via co-cross-linking reaction that endorsed overall mechanical properties of capsule membrane and make them more beneficial for adsorption process (Fig.…”

Section: Ftir Powder Xrd Tga and Edx Analysesmentioning

confidence: 99%

Encapsulated green magnetic nanoparticles for the removal of toxic Pb2+ and Cd2+ from water: Development, characterization and application

Ali

Peng

Lin

et al. 2019

Journal of Environmental Management

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Current research is based on an innovative approach of the fabrication of encapsulated sustainable, green, phytogenic magnetic nanoparticles (PMNPs), to inhibit the generation of secondary pollutants (Iron/ Fe o) during water treatment applications. These novel bio-magnetic membrane capsules (BMMCs) were prepared using two-step titration gel crosslink method, with polyvinyl alcohol and sodium alginate matrix as the model encapsulating materials to eliminate potentially toxic metals (Pb 2+ and Cd 2+) from water. The development of BMMCs was characterized by FTIR, XRD, XPS, SEM, VSM, TGA and EDX techniques. The effects of various operating parameters, adsorbent dose, contact time, solution pH, temperature, initial concentration of metals cations and co-existing ions were studied. The hysteresis loops have illustrated an excellent super-paramagnetic nature, demonstrating the smooth encapsulation of PMNPs without losing their magnetic properties. The maximum monolayer adsorptive capacities estimated at pH 6.5 by the Langmuir isotherm model were 548 and 610.67 mg/g for Pb 2+ and Cd 2+ , respectively. The novel BMMCs did not only control oxidation of PMNPs but also sustained the adsorptive removal over a wide range of pH (3-8), and the electrostatic interaction and ion-exchange were the core adsorption mechanisms. The BMMCs could easily be regenerated using 25% HNO3 as an eluent for successful usage in seven repeated cycles. Therefore, the BMMCs as a material can be used as an excellent sorbent or composite material to remove toxic metals Pb 2+ and Cd 2+ , showing strong potential for improving water and wastewater treatment technologies.

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Development of an innovative capsule with three-dimension honeycomb architecture via one-step titration-gel method for the removal of methylene blue

Lin

Shi

Wei

et al. 2019

International Journal of Biological Macromolecules

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The effects of magnetic nanoparticles embedded with SA/PVA and pH on chemical-mechanical polishing wastewater and magnetic particle regeneration and recycle

Cited by 13 publications

References 44 publications

Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads

Magnetophoretic Harvesting of Nannochloropsis oculata Using Iron Oxide Immobilized Beads

Encapsulated green magnetic nanoparticles for the removal of toxic Pb2+ and Cd2+ from water: Development, characterization and application

Development of an innovative capsule with three-dimension honeycomb architecture via one-step titration-gel method for the removal of methylene blue

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