Green Synthesis of Reduced Graphene Oxide by Using Tropical Microalgae and its Application in Biophotovoltaic Devices DOI

Jing-Ye Tee,

Fong-Lee Ng,

Fiona Seh-Lin Keng

et al.

Published: Jan. 1, 2023

The successful commercialization of algal biophotovoltaics (BPV) technology hinges upon a multifaceted approach, encompassing factors such as the development cost-efficient and highly conductive anode material. To address this issue, we developed an environmentally benign method producing reduced graphene oxide (rGO), using concentrated Chlorella sp. UMACC 313 suspensions reducing agent. produced rGO was subsequently coated on carbon paper (rGO-CP) used BPV device’s anode. As result, maximum power density increased by 950 % for 258 (0.210 mW m-2) 781 Synechococcus 371 (0.555 compared to bare CP. improved microalgae adhesion electrical conductivity brought effective removal oxygen functional groups may be causes this. This study has demonstrated how microalgal-reduced GO improve efficiency bioelectricity.

Language: Английский

Seaweed blue carbon: Ready? Or Not? DOI
Rod Fujita, Simona Augytė,

Jennifer Bender

et al.

Marine Policy, Journal Year: 2023, Volume and Issue: 155, P. 105747 - 105747

Published: July 20, 2023

Language: Английский

Citations

27
Analytical methods for the analysis of bromoform in red seaweed Asparagopsis armata and Asparagopsis taxiformis – A review DOI Creative Commons

Joshua L. Hutchings,

Yevgeniya Grebneva,

Sarah J. Dilmetz

et al.

Algal Research, Journal Year: 2024, Volume and Issue: 79, P. 103478 - 103478

Published: March 19, 2024

Global warming is a significant risk to all species on this planet and exacerbated by the release of greenhouse gases (GHG) into atmosphere. Agricultural practices represent >20 % total GHG emissions with 14.6 being ruminant livestock farming alone. The red seaweed Asparagopsis taxiformis armata are source bioactive substances including brominated compounds that have been shown reduce methane emission up 98 when supplemented feeding regimes. Bromoform major contributor reduction in methanogenesis can be found remarkably high concentrations 1–5 dry mass species. toxicity bromoform makes it essential for emerging industry accurately quantify Asparagopsis. quantification normally conducted hyphenated gas chromatography system due its volatility routine methods established over 60 years water air. complexity algal matrix provides challenge researchers alike extract manner safe, green, cost-effective reflective actual concentration. This review summarises instrumentation methods, non-chromatography potentially useful quantification, sample preparation in-field analysis, storage stability seaweed.

Language: Английский

Citations

5
Green synthesis of reduced graphene oxide by using tropical microalgae and its application in biophotovoltaic devices DOI Creative Commons

Jing-Ye Tee,

Fong-Lee Ng,

Fiona Seh-Lin Keng

et al.

iScience, Journal Year: 2024, Volume and Issue: 27(4), P. 109564 - 109564

Published: March 26, 2024

The successful commercialization of algal biophotovoltaics (BPV) technology hinges upon a multifaceted approach, encompassing factors such as the development cost-efficient and highly conductive anode material. To address this issue, we developed an environmentally benign method producing reduced graphene oxide (rGO), using concentrated Chlorella sp. UMACC 313 suspensions reducing agent. produced rGO was subsequently coated on carbon paper (rGO-CP) used BPV device's anode. As result, maximum power density increased by 950% for 258 (0.210 mW m−2) 781% Synechococcus 371 (0.555 compared to bare CP. improved microalgae adhesion electrical conductivity brought effective removal oxygen functional groups may be causes this. This study has demonstrated how microalgal-reduced GO improve efficiency bioelectricity.

Language: Английский

Citations

5
Diel variation of seawater volatile organic compounds, DMSP-related compounds, and microbial plankton inside and outside a tropical coral reef ecosystem DOI Creative Commons

Marta Masdeu‐Navarro,

Jean‐François Mangot, Lei Xue

et al.

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Feb. 16, 2024

Biogenic volatile organic compounds (VOCs) play key roles in coral reef ecosystems, where, together with dimethylated sulfur compounds, they are indicators of ecosystem health and used as defense strategies infochemicals. Assessment prediction the exchange rates VOCs between oceans atmosphere, implications for atmospheric reactivity climate, hampered by poor knowledge regulating processes their temporal variability, including diel cycles. Here, we measured variation over 36h concentrations DMSPCs (dimethylsulfoniopropionate (DMSP)-related namely DMSP, dimethylsulfoxide, acrylate, dimethylsulfide, methanethiol dimethyl disulfide) (COS, CS 2 , isoprene, iodomethanes CH 3 I ClI, bromomethanes CHBr Br ), surface waters inside shallow, northern coral-reef lagoon Mo’orea (French Polynesia) 4 km offshore, tropical open ocean. Comparisons concurrent measurements sea temperature, solar radiation, biogeochemical variables (nutrients, matter), abundances taxonomic affiliations microbial plankton were conducted aim to explain interconnections DMSPCs, VOCs, environment across In ocean waters, deeper mixing low nutrient levels resulted phytoplankton biomass bacterial activity. Consequently, patterns more dependent on photochemical reactions, daytime increases several dissolved COS, I, ClI. A eukaryotic assemblage dominated dinoflagellates haptophytes provided higher cell-associated DMSP concentrations, yet occurrence degradation products (dimethylsulfide, was limited loss. Conversely, shallow back proximity seafloor sediments, corals abundant seaweeds levels, freshly-produced matter, activity, larger algal populations Mamiellales diatoms Cryptomonadales . dimethylsulfoxide lower but those most higher. combination photobiological yielded sunny-daytime nighttime decreases disulfide, bromomethanes. Our results illustrate important role radiation DMSPC VOC cycling, relevant design sampling that seek representative comparable these compounds.

Language: Английский

Citations

3
Beneficial effects of dietary supplementation of tropical seaweeds on rumen fermentation, antioxidant status, immunity and milk yield of lactating Murrah buffaloes DOI

G. B. Dahiphale,

Ashim Kumar Das,

P. Bagavan Reddy

et al.

Journal of Applied Phycology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 16, 2024

Language: Английский

Citations

2
Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms DOI Creative Commons
Mathinee Yucharoen, Sutinee Sinutok, Ponlachart Chotikarn

et al.

Frontiers in Marine Science, Journal Year: 2021, Volume and Issue: 8

Published: Oct. 26, 2021

Tropical shallow-water habitats represent the marine environments with greatest biodiversity; however, these are most vulnerable to climate warming. Corals, seagrasses, and macroalgae play a crucial role in structure, functions, processes of coastal ecosystems. Understanding their growth physiological responses elevated temperature interspecific sensitivity is necessary step predict fate future community. Six species representatives, including Pocillopora acuta , Porites lutea Halophila ovalis Thalassia hemprichii Padina boryana Ulva intestinalis collected from Phuket, Thailand, were subjected stress manipulation for 5 days. Corals tested at 27, 29.5, 32, 34.5°C, while seagrasses 37, 42°C. After period, allowed recover days 27°C corals 32°C macroalgae. Non-destructive evaluation photosynthetic parameters ( F v / m 0 ϕPSII rapid light curves) was carried out on 0, 3, 5, 6, 8, 10. Chlorophyll contents rates quantified end stress, recovery periods. An integrated biomarker response (IBR) approach adopted integrate candidate chlorophyll content, rate) quantify overall effects. Elevated temperatures found affect photosynthesis, all species. Lethal effects detected 34.5°C corals, whereas adverse but recoverable 32°C. Seagrasses displayed decline photosynthesis lethal In some species, sublethal manifested as slower lower content 37°C, remained unaffected. Among all, T. highest thermotolerance. IBR provided evidence that affected performance depending level. Our findings show differs among important groups tropical organisms inhabiting same highlights importance integrating biomarkers across biological levels assess vulnerability

Language: Английский

Citations

15
Measurements and Modeling of the Interhemispheric Differences of Atmospheric Chlorinated Very Short‐Lived Substances DOI
Behrooz Roozitalab, L. K. Emmons, Rebecca S. Hornbrook

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(2)

Published: Jan. 22, 2024

Abstract Chlorinated very short‐lived substances (Cl‐VSLS) are ubiquitous in the troposphere and can contribute to stratospheric chlorine budget. In this study, we present measurements of atmospheric dichloromethane (CH 2 Cl ), tetrachloroethene (C 4 chloroform (CHCl 3 1,2‐dichloroethane (1,2‐DCA) obtained during National Aeronautics Space Administration (NASA) Atmospheric Tomography (ATom) global‐scale aircraft mission (2016–2018), use Community Earth System Model (CESM) updated with recent chemistry further investigate their global tropospheric distribution. The measured average Cl‐VSLS mixing ratios, from 0.2 13 km altitude, were 46.6 ppt 9.6 7.8 (1,2‐DCA), 0.84 ) by NSF NCAR Trace Organic Analyzer (TOGA) ATom. Both model show distinct hemispheric gradients mean Northern Southern Hemisphere (NH/SH) ratio or greater for all four Cl‐VSLS. addition, TOGA profiles over NH mid‐latitudes showed general enhancements Pacific basin compared Atlantic basin, up ∼18 difference CH mid troposphere. We tagged regional source emissions C found that Asian dominate distributions these species both at surface (950 hPa) high altitudes (150 hPa). Overall, our results confirm relatively ratios UTLS region CESM does a reasonable job simulating abundance but also note uncertainties active sources model. These findings will be used validate future emission inventories fast convective transport impact on ozone.

Language: Английский

Citations

1
Impacts of ocean biogeochemistry on atmospheric chemistry DOI Creative Commons
Liselotte Tinel, Jonathan P. D. Abbatt, E. S. Saltzman

et al.

Elementa Science of the Anthropocene, Journal Year: 2023, Volume and Issue: 11(1)

Published: Jan. 1, 2023

Ocean biogeochemistry involves the production and consumption of an array organic compounds halogenated trace gases that influence composition reactivity atmosphere, air quality, climate system. Some these molecules affect tropospheric ozone secondary aerosol formation impact atmospheric oxidation capacity on both regional global scales. Other emissions undergo transport to stratosphere, where they contribute halogen burden ozone. The oceans also comprise a major sink for highly soluble or reactive gases. These issues are active area research by SOLAS (Surface Lower Atmosphere) community. This article provides status report progress over past decade, unresolved issues, future directions understand ocean gas-phase chemistry. Common challenges across subject involve establishing role biology plays in controlling atmosphere inclusion such complex processes, example involving sea surface microlayer, large-scale models.

Language: Английский

Citations

3
Emission of volatile halocarbons from the farming of commercially important tropical seaweeds DOI
Fiona Seh-Lin Keng, Siew‐Moi Phang, Noorsaadah Abd Rahman

et al.

Journal of Applied Phycology, Journal Year: 2023, Volume and Issue: 35(6), P. 3007 - 3020

Published: Sept. 9, 2023

Language: Английский

Citations

2
Physiological responses and altered halocarbon production in Phaeodactylum tricornutum after exposure to polystyrene microplastics DOI Creative Commons

Xiao‐Ping Lang,

Zhen He,

Gui‐Peng Yang

et al.

Ecotoxicology and Environmental Safety, Journal Year: 2023, Volume and Issue: 268, P. 115702 - 115702

Published: Nov. 17, 2023

Oceanic emissions are a major source of atmospheric, very short-lived, ozone-depleting, brominated substances. These substances can be produced by marine microalgae, estimates their current and future imperfect, because the processes which microalgae respond to environmental changes rarely account for pollutants. Here, concurrent measurements potential effects polystyrene (PS) microplastics with concentrations 25-100 mg/L on growth Phaeodactylum tricornutum volatile halocarbons (VHCs) production were made over 20-day culture period. The maximum inhibition rates (IR) due 0.1 µm 0.5 PS cell density 40.11 % 32.87 %, Chl content 25.89 20.73 Fv/Fm 9.74 9.00 respectively. All IR showed dose-dependent maxima occurring in logarithmic phase. However, stationary phase, P. exposed exhibited improved attributes. Enhanced biogenesis VHCs was induced excess reactive oxygen species algal cells exposure, higher phase than This represents that oxidative stress plays dominant role determining release CHBrCl2, CHBr2Cl, CHBr3. Hence, we suggest widespread ocean may partly responsible increase emission phytoplankton, thereby affecting ozone layer recovery future.

Language: Английский

Citations

2