Peng Hu,Hao Liu,Hao Wang,Jie Zhou,Yongqing Wang,Hongbing Ji
CO2 capture, especially under ultralow-pressure regions (400–10 000 ppm), is extremely essential and challenging to keep the prolonged manual operation in confined spaces and reduce CO2 corrosion in natural gas. Although many MOFs have been covered for CO2 capture, they usually suffered from unheeded morphology engineering associated with diffusion kinetics and unbridgeable CO2 adsorption under ultralow pressure. Herein, we have successfully targeted pyrazine-functionalized Co-MOF (1a′) nanocrystals having dapper hexahedral morphology through skillfully integrating morphology engineering and pore functionality. The yielded 1a′ paradigm with snug pore microenvironment afforded record-high adsorption performance for trace CO2 capture (1.36 mmol g−1 at 400 ppm and 5.7 mmol g−1 at 10 000 ppm), yet eclipsed adsorption behavior for CH4 and N2 at 298 K. The decent pore geometry awarded 1a′ with superior property for CO2/CH4 and CO2/N2 separation, giving higher IAST selectivity (1454 for 15/85 CO2/N2 and 494 for 50/50 CO2/CH4). Besides, 1a′ showed an improved hydrophobic nature, with a desired CO2/H2O uptake ratio of 0.45 and improved diffusion selectivity (DM,CO2/DM,H2O) of 17.7. Breakthrough tests visualized that 1a′ could realize high-purity CO2 (>96%), yielding maximum CO2 productivity (162 and 164.9 litres per kilogram for 18/85 CO2/N2 and 50/50 CO2/CH4). Modeling simulations have cooperatively revealed the structure–property relationship between guest molecules and the framework. This work presents an advanced benchmark adsorbent for low-concentration CO2 capture from flue gas and natural gas.
Mingchen Xu,Yunyun Sun,Chao Yao,Bingying Gao,Linqiang Mao
Graphical This work highlights a novel approach to fabricate porous functional monolithic aerogels from spent lead paste anode materials by a simple sol-gel method. The resulting product is monolithic has excellent thermal insulation and electromagnetic interference shielding properties and could potentially be used in the outer shells or insulating tiles of satellites and spacecraft. The safe disposal of lead-acid batteries has emerged as a critical environmental challenge of global concern. The development of innovative treatment technologies is crucial for addressing the imminent surge in spent lead-acid battery waste. This work presents an innovative strategy for fabricating porous functional monolithic aerogels (PFMA) derived from spent lead paste anode materials. PFMA was synthesized via a facile sol-gel method by reacting spent lead paste anode material with AlCl 3 ·6H 2 O and C 8 H 12 O 8 Zr at a mild temperature (98 °C). Aluminum dihydrogen phosphate (AHP) was employed as an inorganic binder to enhance high-temperature stability in the composite system. The as-prepared PFMA exhibits a monolithic structure with excellent thermal insulation and good electromagnetic interference (EMI) shielding properties. The as-synthesized PFMA exhibits a low thermal conductivity of 0.16 W/(m·k), demonstrating comparable thermal insulation performance to conventional refractory ceramic composites (Al 2 O 3 -ZrO 2 and Al 2 O 3 -Cr 2 O 3 ). When subjected to butane flame exposure (∼1300 °C) for 3 min, the 16 mm thick PFMA sample exhibited only a modest front surface temperature increase to 140 °C, demonstrating exceptional thermal insulation. Moreover, PFMA exhibits good EMI shielding performance in the range of 12–18 GHz, which corresponds to satellite and radar bands suggesting a promising potential application in this field.
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