Revealing dual roles of g-C3N4 in Chlorella vulgaris cultivation

Feng, Qian; Sun, Yabo; Liu, An; Lin, Xiangang; Lü, Tao; Ding, Dawei; Shi, Menghan; Sun, Yingqiang; Yuan, Yupeng

doi:10.1016/j.jhazmat.2021.127639

Cited by 11 publications

(6 citation statements)

References 40 publications

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“…Thus, the cell metabolic activity and photosynthetic rate were improved, which was indicated as a high ETSA value. A similar result was reported previously, that exogenous nanomaterials were found to be a more direct and easier way to stimulate and regulate cell metabolism, thus enhancing metabolic activity and improving photosynthetic rate [48].…”

Section: Synergetic Mechanism Of Phenol Degradation By Bio-tio 2 /Alg...supporting

confidence: 89%

“…The decreased MDA might be attributed to the promotion of EPS secretion triggered by bio-TiO 2 NPs, protecting cells from damage [ 47 ]. While in stage III, the antioxidant system of microalgae was damaged by oxidative stress due to continuous exposure to adverse environments, resulting in lipid peroxidation of cells and increased MDA content [ 48 ]. Therefore, the bio-TiO 2 NPs enhanced the tolerance of microalgae to toxicity by promoting EPS secretion and reduced lipid peroxidation.…”

Section: Resultsmentioning

confidence: 99%

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Construction of Bio-TiO2/Algae Complex and Synergetic Mechanism of the Acceleration of Phenol Biodegradation

Guo

Yang

et al. 2023

Materials

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Microalgae have been widely employed in water pollution treatment since they are eco-friendly and economical. However, the relatively slow treatment rate and low toxic tolerance have seriously limited their utilization in numerous conditions. In light of the problems above, a novel biosynthetic titanium dioxide (bio-TiO2 NPs)—microalgae synergetic system (Bio-TiO2/Algae complex) has been established and adopted for phenol degradation in the study. The great biocompatibility of bio-TiO2 NPs ensured the collaboration with microalgae, improving the phenol degradation rate by 2.27 times compared to that with single microalgae. Remarkably, this system increased the toxicity tolerance of microalgae, represented as promoted extracellular polymeric substances EPS secretion (5.79 times than single algae), and significantly reduced the levels of malondialdehyde and superoxide dismutase. The boosted phenol biodegradation with Bio-TiO2/Algae complex may be attributed to the synergetic interaction of bio-TiO2 NPs and microalgae, which led to the decreased bandgap, suppressed recombination rate, and accelerated electron transfer (showed as low electron transfer resistance, larger capacitance, and higher exchange current density), resulting in increased light energy utilization rate and photocatalytic rate. The results of the work provide a new understanding of the low-carbon treatment of toxic organic wastewater and lay a foundation for further remediation application.

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Section: Synergetic Mechanism Of Phenol Degradation By Bio-tio 2 /Alg...supporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Construction of Bio-TiO2/Algae Complex and Synergetic Mechanism of the Acceleration of Phenol Biodegradation

Guo

Yang

et al. 2023

Materials

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“…The survey XPS spectra (Figure S7) verify the existence of C and N elements in CCN. The C 1s spectrum (Figure c) displays three peaks at 288.1, 286.6, and 284.8 eV, which are assigned to sp 2 -hybridized carbon (N–CN), terminal amino groups (C–NH x ), and graphitic carbon (C–C/CC), respectively. , In the N 1s spectrum (Figure d), there are three peaks at 401.1, 399.9, and 398.5 eV, which represent the terminal amino groups (C–NH x ), tertiary nitrogen (N– (C) 3 ), and sp 2 -hybridized nitrogen (C–NC), respectively. , The corresponding peak areas of C–NH x , N 3C , and N 2C in the N 1s spectra of BCN and CCN are listed in Table S2. Compared to BCN, the ratio of N 2C /N 3C for CCN decreases and the ratio of N 2C /C–NH x increases.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin Crystalline Carbon Nitride Nanosheets for Highly Efficient Photocatalytic Pollutant Removal and Hydrogen Production

et al. 2023

ACS Appl. Nano Mater.

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We present a facile bottom-up strategy to prepare crystalline polymeric carbon nitride (CCN) with ultrathin 2D nanosheet structures, which involves supramolecular self-assembly into crystalline rodlike intermediates and subsequent thermal-induced exfoliation and polycondensation. Under visible light irradiation, CCN can efficiently remove various high-concentration organic pollutants (50 mg L–1) and synergistically remove organic pollutants and heavy metal ions. The removal rates of all organic pollutants including antibiotics and dyes exceed 95% within 40 min, outperforming previously reported photocatalysts. Moreover, it also exhibits outstanding photocatalytic performance in the water-splitting reaction with a H2 evolution rate of 11.5 mmol g–1 h–1. The highly boosted activity of CCN can be attributed to the significantly improved charge separation, the increased accessible active sites, as well as the enhanced visible light absorption, benefiting from its high crystallinity and ultrathin 2D nanosheet structure. This work presents a feasible strategy for the preparation of crystalline carbon nitride nanosheets toward energy and environmental applications.

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“…Traditionally, algal lipids are extracted before transesterification. Conventional organic solvent extraction, such as Folch’s method using a mixture of 2:1 chloroform:methanol and Bligh and Dyer method, is generally evoked for lipid extraction . However, these methods extremely depend on organic solvents, potentially leading to chemical pollution.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional organic solvent extraction, such as Folch's method using a mixture of 2:1 chloroform:methanol 7 and Bligh and Dyer method, 8 is generally evoked for lipid extraction. 9 However, these methods extremely depend on organic solvents, potentially leading to chemical pollution. Accordingly, supercritical solvent extractions, such as water and CO 2 , are further developed to avoid environmental pollution caused by organic solvents.…”

Section: ■ Introductionmentioning

confidence: 99%

Competition of Dual Roles of Ionic Liquids during In Situ Transesterification of Wet Algae

Ding

Shen

et al. 2022

ACS Sustainable Chem. Eng.

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Ionic liquid (IL)-catalyzed in situ transesterification (IST) of wet algae is a promising strategy for energy-efficient biodiesel production owing to the dual roles of ILs as both solvents of the cell wall and catalysts of transesterification, while their variations and interactions within different water contents, which subsequently affect biodiesel production, are still out of knowledge. Accordingly, the variations of fatty acid methyl ester (FAME) yields and cellulose solubilities of [Bmim][HSO 4 ], [Bmim]-[H 2 PO 4 ], and [Bmim] 2 [HPO 4 ] under different water conditions are experimentally and theoretically studied. Results indicate that [Bmim][HSO 4 ], [Bmim][H 2 PO 4 ], and [Bmim] 2 [HPO 4 ] are acid, weak alkaline, and strong alkaline catalysts of transesterification of lipid with methanol, respectively. FAME yields of both [Bmim]-[HSO 4 ]-and [Bmim][H 2 PO 4 ]-catalyzed reactions increase initially with the addition of 1.5 g of water, while they decrease with the increase of water content because of the consequent decline of the nucleophilic index and electrophilic index of the OH groups of [Bmim][HSO 4 ] and [Bmim][H 2 PO 4 ], respectively. Analogously, slight decreases of FAME yields of [Bmim] 2 [HPO 4 ]-catalyzed transesterification are observed within 0.0−3.0 g of water, while a notable decrease is presented when 6.0 g of water is added. Contrary to the variation of catalytic properties, the cellulose solubilities of [Bmim][HSO 4 ], [Bmim][H 2 PO 4 ], and [Bmim] 2 [HPO 4 ] all decrease with the addition of 1.5 g of water, as the water molecules occupy the H-bonding sites of [Bmim][HSO 4 ]−cellobiose (clb), while the H-bonding interactions of water−clb and water− [Bmim][H 2 PO 4 ] formed by shared oxygen atoms are enhanced with the increase of water content, subsequently enhancing the Hbonding interactions of ILs−clb and relative cellulose solubilities. The variations of cellulose solubilities of ILs with the addition of 0.0−6.0 g of water are opposite to those of their catalytic properties. This study indicates that the cellulose solubilities and catalytic properties of [Bmim][HSO 4 ], [Bmim][H 2 PO 4 ], and [Bmim] 2 [HPO 4 ] compete with each other under different water conditions, providing a potential strategy to offset the negative effect of water content on IST of wet algae.

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Revealing dual roles of g-C3N4 in Chlorella vulgaris cultivation

Cited by 11 publications

References 40 publications

Construction of Bio-TiO2/Algae Complex and Synergetic Mechanism of the Acceleration of Phenol Biodegradation

Construction of Bio-TiO2/Algae Complex and Synergetic Mechanism of the Acceleration of Phenol Biodegradation

Ultrathin Crystalline Carbon Nitride Nanosheets for Highly Efficient Photocatalytic Pollutant Removal and Hydrogen Production

Competition of Dual Roles of Ionic Liquids during In Situ Transesterification of Wet Algae

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