Harvesting Nannochloropsis oculata by Chitosan and AlCl3-Induced Flocculation: Effects of Microalgal Condition on Flocculation Performance

Wang, Quan; Oshita, Kazuyuki; Takaoka, Masaki

doi:10.1007/s12155-020-10201-z

Cited by 8 publications

(3 citation statements)

References 52 publications

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“…A significant difference was found for the marine microalgal broth (N. oculata in this study) where almost no flocculation occurred in marine microalgal broth at low pH (pH<7) (Fig. 1m), even at a high chitosan dosage (150 mg/L), in accordance with previous studies [26][27][28]. Chitosan as a long chain polymer is coiled in marine medium as the cationic charges are shielded by the high ionic strength (i.e.…”

Section: Resultssupporting

confidence: 91%

Exploiting flocculation and membrane filtration synergies for highly energy-efficient, high-yield microalgae harvesting

Zhao

Blockx

Muylaert

et al. 2022

Separation and Purification Technology

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Section: Resultssupporting

confidence: 91%

Exploiting flocculation and membrane filtration synergies for highly energy-efficient, high-yield microalgae harvesting

Zhao

Blockx

Muylaert

et al. 2022

Separation and Purification Technology

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“…The NO 2 and HCl in the reaction were generated by heating a mixture of 0.05 equiv of aluminum chloride hydrate (AlCl 3 · x H 2 O), 0.67 equiv of aluminum nitrate hydrate [Al(NO 3 ) 3 · x H 2 O] (2.0 equiv NO 3 – ) with respect to 13 CH 4 , together with 20 μL of deionized water in a 25 mL pressure-tight Schlenk tube [CH 4 : 0.2 mmol, O 2 : 0.72 mmol, He: 0.08 mmol, AlCl 3 · x H 2 O: 0.01 mmol, Al(NO 3 ) 3 · x H 2 O: 0.13 mmol, and H 2 O: 1.1 mmol] (Figure a). Hydrolysis and decomposition of AlCl 3 and Al(NO 3 ) 3 can produce a low concentration of NO 2 and HCl in the gas phase . The 20 μL of water also went to the gas phase at the reaction temperature of 100 °C.…”

Section: Resultsmentioning

confidence: 99%

Photo-Driven Aerobic Methane Nitration

Zhang

Chen

et al. 2023

Inorg. Chem.

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Conversion of methane to liquid oxygenates is challenging but of great value. Here, we report the oxidation of methane (CH4) to methanol (CH3OH) assisted by nitrogen dioxide (NO2) as a photo-mediator and using molecular oxygen (O2) as the terminal oxidant. Similar photoreactions are widely studied in atmospheric chemistry but were not previously used in preparative methane conversion. We used visible light to excite NO2 generated by heating aluminum nitrate Al(NO3)3 and drove its reaction with methane and O2 to produce methyl nitrate (CH3ONO2), which is then hydrolyzed to CH3OH. Nitric acid (HNO3) and nitrate (NO3 –) were produced and recycled back to Al(NO3)3, completing a chemical loop. HCl can catalyze this photochemical process via relay hydrogen atom-transfer reactions, with up to 17% methane conversion and 78% CH3ONO2 selectivity. This simple photochemical system provides new opportunities in selective methane transformation.

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“…El Foulani [ 30 ] found that the combination of chitosan and polyaluminum chloride can effectively remove turbidity and natural organic matter from raw water, and the insertion of chitosan into polyaluminum chloride increased the treatment efficiency by increasing the molecular weight, contributing to bridging phenomena and charge neutralization. Wang [ 31 ] used AlCl 3 and chitosan-induced flocculation to harvest N. ophthalmosus, and the results indicated that a higher capture yield with wider applicability could be achieved with lower dosages of the dual flocculant compared with the utilization of the two flocculants individually under most conditions.…”

Section: Introductionmentioning

confidence: 99%

The Synergistic Effects of Al3+ and Chitosan on the Solid–Liquid Separation of Coal Wastewater and Their Mechanism of Action

Chang

Dong

et al. 2022

Polymers

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It is important to identify an environmentally friendly and efficient flocculant that can replace polyacrylamide for the solid–liquid separation of coal wastewater. In this study, to explore whether chitosan can be used as an environmentally friendly and efficient flocculant for the solid–liquid separation of coal wastewater, AlCl3–chitosan was used to conduct flocculation–sedimentation and dewatering tests under different chitosan dosages and shear-strength conditions for the prepared coal wastewater. Focused beam reflectance was measured to dynamically monitor the number of refractory fine particles, and the settled flocs were photographed and analyzed with microscopy to explore the effect of AlCl3–chitosan on the flocculation settlement effect and floc characteristics. The synergistic mechanisms of AlCl3 and chitosan were investigated using quartz crystal dissipative microbalance and zeta potential measurement. The results showed that the addition of chitosan can significantly improve the flocculation–sedimentation and dewatering effects of coal wastewater. A reasonable dosage under a certain shear strength is conducive to the reduction of fine slime particles, which results in a compact floc structure, increases the floc size, and improves the settling effect. The synergistic effect of AlCl3–chitosan improved the electric neutralization and adsorption bridging abilities of the chitosan, and the mixed solution of AlCl3 and chitosan had stronger adsorption on the carbon surface. This study provides a new approach to the selection of flocculants for coal wastewater treatment.

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Harvesting Nannochloropsis oculata by Chitosan and AlCl3-Induced Flocculation: Effects of Microalgal Condition on Flocculation Performance

Cited by 8 publications

References 52 publications

Exploiting flocculation and membrane filtration synergies for highly energy-efficient, high-yield microalgae harvesting

Exploiting flocculation and membrane filtration synergies for highly energy-efficient, high-yield microalgae harvesting

Photo-Driven Aerobic Methane Nitration

The Synergistic Effects of Al3+ and Chitosan on the Solid–Liquid Separation of Coal Wastewater and Their Mechanism of Action

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