title: Facile one-pot preparation of chitosan/calcium pyrophosphate hybrid microflowers.
abstract: Flower-like chitosan/calcium pyrophosphate hybrid microparticles (microflowers) are prepared using a facile one-pot approach by combining ionotropic gelation with biomimetic mineralization. Chitosan-tripolyphosphate (CS-TPP) nanocomplexes are first synthesized through ionotropic gelation; meanwhile, excess TPP is partly hydrolyzed into pyrophosphate ions (P2O7(4-)). Upon addition of CaCl2, CS-TPP nanocomplexes serve as a versatile template, inducing in situ mineralization of Ca2P2O7 and directing its growth and assembly into microflowers. The whole preparation process can be completed within half an hour. The as-prepared microflowers are composed of 23.0% CS-TPP nanocomplexes and 77.0% Ca2P2O7 crystals. Mesopores (3.7 and 11.2 nm) and macropores coexist in the microflowers, indicating porous and hierarchical structures. The microflowers exhibit high efficiency in dye adsorption and enzymatic catalysis. Specifically, a high adsorption capacity of 520 mg g(-1) for Congo red is achieved. And the immobilized enzyme retains about 85% catalytic activity compared with that of the free enzyme. The facile one-pot preparation process ensures the broad applications of the porous hybrid microflowers.
authors: Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, People's Republic of China.
authors: Xiaoli
authors: X
authors: Wang
authors: Jiafu
authors: J
authors: Shi
authors: Zheng
authors: Z
authors: Li
authors: Shaohua
authors: S
authors: Zhang
authors: Hong
authors: H
authors: Wu
authors: Zhongyi
authors: Z
authors: Jiang
authors: Chen
authors: C
authors: Yang
authors: Chunyong
authors: C
authors: Tian
mesh_terms: D002131:Calcium Pyrophosphate / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D016062:Porosity
chemical_list: D048271:Chitosan; D002131:Calcium Pyrophosphate