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Computational fluid dynamics (CFD) is emerging as an appropriate tool for modeling heterogeneous photocatalytic processes, since it allows simultaneous consideration of the different physical phenomena involved in the processes. In the present study, COMSOL Multiphysics software was used to model the flow regime and to determine the distribution of catalyst particles in a falling film photocatalytic reactor, which is relevant to determine the reactor efficiency. The reactor simulations were performed with the COMSOL Mixture module in a turbulent flow regime using the RANS approach. Seven defined zones were detected having a particular catalyst-concentration profile over the entire film area, for which the photonic absorption in the reactor was estimated with the six-flux model (SFM). From this it was obtained that there is a difference of more than 20% between the highest and the lowest value of the average photonic absorption in the reactive area, so it can be expected that the variation in the degradation of pollutants in these zones ranges between 10 and 20%, which should be taken into account for the applicability of the technology. [ABSTRACT FROM AUTHOR]

Biochars are emerging eco-friendly products showing outstanding properties in areas such as carbon sequestration, soil amendment, bioremediation, biocomposites, and bioenergy. These interesting materials can be synthesized from a wide variety of waste-derived sources, including lignocellulosic biomass wastes, manure and sewage sludge. In this work, abundant data on biochars produced from coconut-shell wastes obtained from the Colombian Pacific Coast are presented. Biochar synthesis was performed varying the temperature (in the range: 280 °C-420 °C) and O 2 feeding (in the range: 0-5% v/v) in the pyrolysis reaction. Production yields and some biochar properties such as particle size, Zeta Potential, elemental content (C, N, Al, B, Ca, Cu, Fe, K, Li, Mg, Mn, Na, P, S, Ti, Zn), BET surface area, FT-IR spectrum, XRD spectrum, and SEM morphology are presented. This data set is a comprehensive resource to gain a further understanding of biochars, and is a valuable tool for addressing the strategic exploitation of the multiple benefits they have., (© 2019 The Author(s).)