In order to obtain the cheap waste calcium-based sorbent, three wasted CaCO3 precursors, namely carbide slag, chicken eggshells, and analytical reagent-grade calcium carbonate, were selected and prepared at 700 °C to form calcium-based sorbents for CO2 capture. TGA was used to test the CO2 uptake performance of each calcium-based sorbent in 20 cycles. To identify the decay mechanism of CO2 uptake with an increasing number of cycles, all calcium-based sorbents were characterized by using XRF, XRD, and N2 adsorption. The specific surface area of calcium-based sorbents was used to redefine the formula of cyclic carbonation reactivity decay. The carbonation conversion rate of three calcium-based sorbents exhibited a decreasing trend as the cycle number increased. Chicken eggshells exhibited the most significant decrease rate (over 50% compared with Cycle 1), while carbide slag and analytical reagent-grade calcium carbonate showed a flat linear decline trend. The specific surface area of the samples was used to calculate carbonation conversion for an infinite number of cycles. The carbonation conversion rates of three calcium-based sorbents were estimated to decrease to 0.2898, 0.1455, and 0.3438 mol/mol, respectively, after 100 cycles.
Foregut duplication cyst is most commonly seen in the posterior mediastinum without communication with adjacent organs or presence of other malformations and typically shows ectopic gastric or respiratory epithelium. The finding of ectopic pancreatic tissue is extremely rare. A 15-year-old female patient presented with elevated blood pressure, intermittent right flank pain for 18 months. An abdominal MRI revealed a 4 cm right cystic retroperitoneal mass, initially thought to arise from the right adrenal gland. Intraoperatively, the mass was centered in the retroperitoneum between the right adrenal gland and kidney, without attachments to these organs and no communication with other structures, and it was completely excised. Gross examination revealed a 3.5 cm well-circumscribed solid and cystic mass with orange–white cut surface and cloudy fluid surrounded by variable amounts of adipose tissue. On microscopic examination, the cysts were lined by respiratory and gastric antral/oxyntic-type mucosa, surrounded by muscularis mucosae, submucosal tissue, muscularis propria, and perienteric tissue. Within the muscular propria, exocrine pancreatic tissue was also noted. The patient is well with 7-months of follow up. This case is the first one reporting gastric, respiratory, and pancreatic epithelia.
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