Sustainable Growth and Lipid Production from <i>Chlorella pyrenoidosa</i> Using N-Doped Carbon Nanosheets: Unravelling the Role of Graphitic Nitrogen

Khanra, Anwesha; Sangam, Sujata; Shakeel, Adeeba; Suhag, Deepa; Mistry, Subhradeep; Prakash, Monika; Chakrabarti, Sandip; Mukherjee, Monalisa

doi:10.1021/acssuschemeng.7b03103

Cited by 25 publications

(22 citation statements)

References 40 publications

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“…30 This was probably because pyrrolic-N could be converted into pyridinic- and graphitic-N at the elevated carbonization temperature, 25 as shown in Figure S3. Because of similar bond lengths of C–N (1.41 Å) and C–C (1.42 Å) in sp 2 hybridized hexagonal ring, 32 the N dopants in N-AC should exert less impact on the planar structure of the samples.…”

Section: Results and Discussionmentioning

confidence: 99%

Catalytic Dehydrochlorination of 1,2-Dichloroethane into Vinyl Chloride over Nitrogen-Doped Activated Carbon

et al. 2019

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The pyrolysis of 1,2-dichloroethane (EDC) is the most popular commercialized way of producing vinyl chloride monomers (VCM); however, it is plagued by high-energy consumption and the resulting coke formation. Here, a series of nitrogen-doped (N-doped) activated carbon catalysts (N-AC) were prepared conveniently for EDC dehydrochlorination. The structural and textural properties of N-doped catalysts were characterized by X-ray diffraction, transmission electron microscopy, Raman spectra, temperature-programmed desorption of VCM and EDC, and X-ray photoelectron spectroscopy. The results revealed that doping N into activated carbon supports introduced basicity sites and caused partial graphitization on the catalyst surfaces. Thus, an improved absorption capacity to EDC and VCM and an accelerated desorption rate were obtained, which greatly enhanced EDC conversion and VCM selectivity. EDC was almost completely dehydrochlorided into vinyl chloride at a temperature of 300 °C and an EDC liquid hourly space velocity of 0.313 h –1 . The high catalytic activity and selectivity as well as good stability suggested that the N-AC catalyst would be a promising dehydrochlorination catalyst on an industrial scale.

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Section: Results and Discussionmentioning

confidence: 99%

Catalytic Dehydrochlorination of 1,2-Dichloroethane into Vinyl Chloride over Nitrogen-Doped Activated Carbon

et al. 2019

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“…Indeed, a significant reduction of chlorophyll level and an under-expression of genes associated to chlorophyll biosynthesis resulted from an exposure to rGO or few layer graphene in the algae Scenedesmus obliquus or N. palea , respectively ( Du et al, 2016 ; Garacci et al, 2019 ). In addition, exposure to graphene nanosheets was shown to favor lipid accumulation in Chlorella pyrenoidosa ( Khanra et al, 2018 ). However, in the case of GO exposure, our results are contradictory with the single-species-based literature that usually reports a decrease of chlorophyll pigments ( Tang et al, 2015 ; Hu et al, 2016 ; Hazeem et al, 2017 ; Malina et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Graphene-Based Nanomaterials Modulate Internal Biofilm Interactions and Microbial Diversity

et al. 2021

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Graphene-based nanomaterials (GBMs), such as graphene oxide (GO) and reduced graphene oxide (rGO), possess unique properties triggering high expectations for the development of new technological applications and are forecasted to be produced at industrial-scale. This raises the question of potential adverse outcomes on living organisms and especially toward microorganisms constituting the basis of the trophic chain in ecosystems. However, investigations on GBMs toxicity were performed on various microorganisms using single species that are helpful to determine toxicity mechanisms but fail to predict the consequences of the observed effects at a larger organization scale. Thus, this study focuses on the ecotoxicological assessment of GO and rGO toward a biofilm composed of the diatom Nitzschia palea associated to a bacterial consortium. After 48 and 144 h of exposure to these GBMs at 0, 0.1, 1, and 10 mg.L−1, their effects on the diatom physiology, the structure, and the metabolism of bacterial communities were measured through the use of flow cytometry, 16S amplicon sequencing, and Biolog ecoplates, respectively. The exposure to both of these GBMs stimulated the diatom growth. Besides, GO exerted strong bacterial growth inhibition as from 1 mg.L−1, influenced the taxonomic composition of diatom-associated bacterial consortium, and increased transiently the bacterial activity related to carbon cycling, with weak toxicity toward the diatom. On the contrary, rGO was shown to exert a weaker toxicity toward the bacterial consortium, whereas it influenced more strongly the diatom physiology. When compared to the results from the literature using single species tests, our study suggests that diatoms benefited from diatom-bacteria interactions and that the biofilm was able to maintain or recover its carbon-related metabolic activities when exposed to GBMs.

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“…Herein, the utilization of CNS in the algal growth established an ecofriendly approach targeting high yield of algal biomass and lipids for biofuel, nutraceutical, and other medicinal applications. 50 Earlier reports suggested that CNS are exploited to boost the yield of bioactive compounds. 52 , 53 One such wide approach to be employed for the augmentation of bioactive compound production, by supporting microalgal growth, is the incorporation of CNS.…”

Section: Cns: a New Frontier In Algal Growthmentioning

confidence: 99%

“…From these growth curves, it is evident that our proposed theory helps in predicting the important role of pyridinic and graphitic nitrogen which influences the accumulation of lipid content from microalgae. 50 …”

Section: Interaction Process Of Algal Cells and Cnsmentioning

confidence: 99%

Exploring the Role of Carbon-Based Nanomaterials in Microalgae for the Sustainable Production of Bioactive Compounds and Beyond

et al. 2022

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An enchanting yet challenging task is the development of higher productivity in plants to meet the ample food demands for the growing global population while harmonizing the ecosystem using front-line technologies. This has kindled the practice of green microalgae cultivation as a driver of key biostimulant products, targeting agronomic needs. To this end, a prodigious and economical strategy for producing bioactive compounds (sources of secondary metabolites) from microalgae using carbon-based nanomaterials (CNMs) as a platform can circumvent these hurdles. Recently, the nanobionics approach of incorporating CNMs with living systems has emerged as a promising technique to develop organelles with new and augmented functions. Herein, we discuss the importance of 2D carbon nanosheets (CNS) as an alternative carbon source for the phototrophic cultivation of microalgae. CNS not only aids in cost reduction for algal cultivation but also confers combinatorial innate or exogenous functions that enhance its programmed biosynthetic metabolism, proliferation, or tolerance to stress. Moreover, the inherent ability of CNS to act as efficient biocatalysts can enhance the rate of photosynthesis. The primary focus of this mini-review is the development of an economic route for enhanced yield of bioactive compounds while simultaneously serving as a heterogeneous platform for enhancing the sustainable production of biostimulants including bioactive compounds from algal biomass for pharmaceutical and nutraceutical applications.

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Sustainable Growth and Lipid Production from Chlorella pyrenoidosa Using N-Doped Carbon Nanosheets: Unravelling the Role of Graphitic Nitrogen

Cited by 25 publications

References 40 publications

Catalytic Dehydrochlorination of 1,2-Dichloroethane into Vinyl Chloride over Nitrogen-Doped Activated Carbon

Catalytic Dehydrochlorination of 1,2-Dichloroethane into Vinyl Chloride over Nitrogen-Doped Activated Carbon

Graphene-Based Nanomaterials Modulate Internal Biofilm Interactions and Microbial Diversity

Exploring the Role of Carbon-Based Nanomaterials in Microalgae for the Sustainable Production of Bioactive Compounds and Beyond

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