![]() Long incubation times required to generate kinetic rates for bulk Molecular level (e.g., development of organic tracers), because sufficiently 7 We detail below a hypothetical approach to establish Of the DOM reactivity continuum approach has been established. Processes due to different redox chemistry, even here the validity To that in the water column, as DOM is exposed to fundamentally different May argue that DOM degradation in sediments may not be comparable On a continuum of compounds that react at different kinetic rates,Īnalogous to the freshwater DOM reactivity continuum established forīoreal lake DOM in Sweden. Is more intuitive and plausible that marine DOM reactivity is based Of the marine DOM reactivity continuum, not unlike established modelsįor freshwater and sediment organic matter. Marine DOM pool into broad reactivity brackets of labile, semilabile,Īnd refractory, but here, we argue that we need to introduce the concept Measurements, and C flux budgets that do not take into account DOM Our current working knowledge is inferred from chemical proxies, metabolic Scale from hours to decades or even longer turnover times. Is hampered by its sluggish decomposition, making direct comprehensiveĭecomposition studies prohibitive, given the extremely large time 1− 6 However, our understanding of dissolved organic carbon (DOC) turnover In a kinetic context, including the microbial and physicochemicalĬonstraints on molecular reactivity that are present in the deep ocean.Īt the forefront of global carbon research. We may need to refocus our efforts inĭeciphering the structure and reactivity of marine organic molecules New organic tracers that span large differences in reactivity and To establish and validate such a marine DOM reactivity continuum modelĪre still lacking, and their resolution depends on the discovery of Us to a more accurate assessment of the active and dynamic role marineĭOM plays in the global carbon cycle. To shift our focus to a more inclusive kinetic model and may lead Ultimate but variable sources of marine DOM. We need to gain a fundamental understanding of the biogeochemicalĭrivers of surface water DOM concentrations and reactivity, biologicalĬarbon pump efficiency, and the autotrophic communities that are the The oceans using kinetic data and term this the marine DOM reactivityĬontinuum. We propose the adoption of the carbon reactivityĬontinuum concept previously established for lakes and sediments for 166.Challenges our current understanding of the marineĬarbon cycle, including an alternative explanation of bulk 14C-DOM measurements. ![]() Overall, the revealed reactivity–composition relationship can be extended to selectively prepare carbon- or carbide-based target materials as well as to harvest both C and Si from Si-containing waste biomasses. ![]() In addition, when bio-silica is used as Si resource, the C–Si composites prepared from the rice husks also exhibit excellent electrochemical performance, delivering a specific discharge capacity of 687 mAh g −1 at 2 A g −1 after 300 cycles. The obtained C–Si composites reduced from C–SiO 2 show excellent electrochemical performance, delivering a specific discharge capacity of 925 mAh g −1 at 1 A g −1 after 200 cycles and 825 mAh g −1 at 2 A g −1 after 300 cycles. The reduction product is SiC when using Mg as the reductant, while the C–Si composites are formed when using the reductants with relatively low reactivity ( e.g., Mg–Si alloy, Ca–Si alloy). In this paper, the formation of SiC can be tentatively controlled by tuning the reactivity of reductants that can be modulated by alloying with Si at different atomic ratios. Suppressing the formation of SiC during the magnesiothermic reduction of SiO 2–C composite is still challenging.
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