Template-Free Method For The Synthesis Of High-Pore-Volume Gamma-Al2o3 Nanofibers In A Membrane Dispersion Microreactor

Mesoporous gamma-Al2O3 nanofibers with high pore volume and uniform pore size distributions were successfully synthesized via a template-free method in a membrane dispersion microreactor followed by calcination. The effects of crystal temperature, pH values, continuous phase concentration and washing solvent on the gamma-Al2O3 nanofibers were carefully studied. The results showed that the as-obtained gamma-Al2O3 nanofibers showed a length of 40-60 nm and a width of 3.2-3.4 nm, which were attributed to the high microscopic mixing rate in the membrane dispersion microreactor. Moreover, the precursors of gamma-Al2O3 nanofibers treated with deionized water and mixed deionized water/alcohol solution had high pore volumes, reaching to 1.60 ml g(-1) and 2.00 ml g(-1), respectively. Furthermore, the adsorption performance of gamma-Al2O3 nanofibers with high pore volumes was also investigated. These fibers showed an excellent adsorption capacity of 1323.68 mg g(-1) for the removal of Congo red from aqueous solution, thereby indicating their potential for applications in adsorption and other related areas.