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The mesoporous nanotubes of iron phosphate are synthesized
by surfactant templating and solvothermal methods. When the
concentration of the surfactant (SDS) is set at the transition region
between its lamellar and hexagonal mesophases, the coassemblies
of iron phosphate and SDS form a flake-type mesoporous iron
phosphate. The following solvothermal treatment produces
mesoporous nanotubes of FePO4 with diameters of 50-400 nm
and lengths of several microns. The removal of surfactant by ion
exchange and heat treatment produces the clean nanotubular and
mesoporous iron phosphate, which possesses a specific surface
area of 232 m2/g and a bimodal distribution of pore sizes,
corresponding to the mesopores of the walls and the nanotube
diameters, respectively. The novel tubular material with composite
meso-macroporous structure, benefiting the diffusion of reactive
molecules, has shown better catalytic performance for direct
hydroxylation of benzene with hydrogen peroxide compared with
conventional mesoporous iron phosphate.

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