Fu, Ruicheng, et al. Fuel 331 (2023): 125873.
Li4SiO4 shows great potential for cyclic high-temperature CO2 capture due to its excellent stability, high capacity, and low regeneration temperature. However, its dense morphology and abrasion issues are major obstacles to its practical application. This work proposes a novel and simple approach using polyvinyl alcohol (PVA) technology for the one-step preparation of porous spherical Li4SiO4 particles for the first time. The produced particles exhibit uniform diameter distribution between 2.5-3.5 mm, with a high capacity of up to 0.320 g CO2/g adsorbent.
Spherical Li4SiO4 Particles Preparation Using the Polyvinyl Alcohol (PVA) Method
The formation of spherical Li4SiO4 particles was achieved using the PVA method. In the initial step, Li4SiO4 powder was mixed with a hot PVA solution to form a viscous slurry. This slurry was then dripped through a nozzle into cold acetone. The droplets automatically formed gel spheres due to surface tension. The PVA solution acted as a scaffold template, fixing the Li4SiO4 powder in the slurry to create spherical Li4SiO4 droplets. The solid-to-liquid ratio (by weight) needed to be carefully controlled to obtain gel spheres with good sphericity and robustness. After placing the gel spheres in cold acetone for an hour, they were washed and further dried in an oven for 4 hours. Finally, the gel spheres were calcined in air at 850 °C for 30 minutes to obtain spherical Li4SiO4 particles with a uniform diameter of 2.5-3.5 mm.
Ullah, Rizwan, et al. Synthetic Metals 222 (2016): 162-169.
The performance of conductive polymers (CPs), such as polyaniline (PANI) and its derivatives, can be altered, improved, or even enhanced by preparing composites with materials that modify the doping degree and level in the CPs. This paper reports the synthesis of PANI using inverse emulsion polymerization in the presence of varying concentrations of polyvinyl alcohol (PVA). The results show that the formation of PVA-doped polyaniline exhibits high thermal stability and improved room temperature conductivity.
Experimental Procedure
In a typical experiment, 50 mL of toluene was placed in a 100 mL round-bottom flask. Under mechanical stirring, 0.40 g of benzoyl peroxide was added. Following this, 10 mL of 2-propanol was added to the solution. Subsequently, 1.5 mL of dodecylbenzenesulfonic acid (DBSA), 0.2 mL of aniline, and 10 mL of deionized water were added to the mixture, forming a white milky emulsion. The oxidant to monomer ratio was 1.96. After 7 hours, the reaction mixture turned a greenish-brown color, and the reaction was allowed to continue for a total of 24 hours. The water layer was separated from the organic layer using a separatory funnel. The obtained organic layer was then suspended in 50 mL of acetone. The relatively dense PANI phase separated from the acetone layer. This separation process was repeated four times for each sample. The resultant product was then transferred to a petri dish and dried in an oven at 40 °C for 24 hours. The polymer was then broken into flakes by adding a small amount of acetone. The polymer was removed from the petri dish and labeled as PANI. Following the same procedure, PANI/PVA samples were prepared by replacing the 10 mL deionized water with 10 mL of PVA solution at different concentrations (1%, 2%, 3%, 4%, 5%, and 6%).
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