Chemical Engineering & Technology

This study demonstrates highly effective and reusable methylene blue (MB) removal using coal fly ash-derived silica. Over 12 cycles, consistent 97 % MB removal was achieved, surpassing other reported silica adsorbents. This highlights the material's economic potential and promotes sustainable waste repurposing for environmental remediation.

Four types of slow-release NPK fertilizers were prepared by coating granules with pyrolysis oils derived from both bio-based and petroleum-based polymeric waste materials. The functional groups present in these oils played a crucial role in strong chemical interactions with ions of the fertilizer, leading to the formation of porous coatings. This porous structure effectively slowed the release of nutrients. Among the coatings, those made from lignocellulosic feedstocks exhibited improved nitrogen retention and a more controlled release profile. This approach demonstrates how waste streams can be transformed into efficient agricultural inputs, offering an eco-friendly alternative to synthetic coatings and advancing sustainable nutrient management practices.

Water molecules significantly impact methane diffusion in silica by altering diffusion coefficients, activation energy, and pathways. Hydration affects methane mobility and accessibility through hydrate formation within the porous structure.

Physical characteristics, DEM contact and Tavares Breakage parameters were measured for an itabirite iron ore. Comparison of experiments in a laboratory jaw crusher to simulations showed good agreement of throughputs, marginal underpredictions of power, while some overpredicted product fineness.

Understanding how each mass balance equation affects the sulfur removal is relevant for proper simulation of HDT reactor. This study uses reactor modeling to assess the individual and combined effects of HDT reaction mass balances on HDS performance, offering insights into inhibition phenomena and hydrogen consumption critical for ULSD production.