Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 16, Pages 14522-14532Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am503787h
Keywords
microflowers; chitosan; calcium pyrophosphate; mineralization; dye adsorption; enzyme immobilization
Funding
- National Science Fund for Distinguished Young Scholars [21125627]
- National Basic Research Program of China [2009CB724705]
- National Science Foundation of China [20976127, 21076145]
- Program of Introducing Talents of Discipline to Universities [B06006]
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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 (P2O74-). 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.
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