Nonaqueous precipitation combined with intermolecular polycondensation synthesis of novel HAp porous skeleton material and its Pb2+ ions removal performance

Abstract

Novel HAp porous skeleton material with high pore homogeneity is prepared via nonaqueous precipitation method combined with medium-temperature induced intermolecular polycondensation. The obtained porous skeleton HAp material, which has characteristics of highly uniform hexagonal pore, is characterized via X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and Pb2+ removal performance test. The results show that the porous skeleton material presents with a highly uniform hexagonal pore. Both of the pore sizes and pore wall particles sizes have the average values of about 350 nm, with a different sizes range of 120–680 nm and 120–780 nm, respectively. HAp porous skeleton material has Pb2+ions removal performance almost equivalent to that of nano porous sheets, because of its very uniform distribution of elements and three-dimensional structure caused by the uniform connection of the penetrating structure, group assembly, and intermolecular condensation. HAp porous skeleton material has much better separation performance and can effectively avoid problems of secondary pollution and difficulty for separation. HAp porous skeleton material is expected to be a novel excellent adsorbent for Pb2+ions purifying in industrial wastewater.