Synthesis of hierarchically porous TiO2 nanomaterials using alginate as soft templates

Synthesis of hierarchically porous TiO2 nanomaterials using alginate as soft templates
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以海藻酸盐为软模板合成分级多孔TiO2纳米材料

DOI:
10.1016/j.materresbull.2016.07.014
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发表时间:
2016-11
影响因子:
5.4
通讯作者:
Tang Chengchun
Tang Chengchun
中科院分区:
材料科学2区
文献类型:
--
作者:
Yu Chao;Li Xiaopeng;Liu Zhenya;Yang Xiaojing;Huang Yang;Lin Jing;Zhang Jun;Tang Chengchun

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本文报道了一种由纳米颗粒组成的分层多孔tio2结构的大规模合成方法。天然丰富的海藻酸盐生物聚合物作为牺牲模板,提供了多孔结构并控制了tio2纳米颗粒的形态。所得tio2纳米颗粒的尺寸约为20 nm。通过将Ti4+离子与海藻酸盐直接交联,然后燃烧生物聚合物模板,得到TiO2结构。通过对各种反应条件的观察,我们提出海藻酸盐在形成分层多孔tio2结构中有两个重要的作用。一个是作为TiO2成核的模板。二是促进多孔tio2纳米材料的形成。层次化多孔TiO2对有机染料的光催化性能优于市售TiO2。
We herein report a large-scale synthesis of hierarchically porous TiO2structures composed of nanoparticles by a facile soft-template method. The natural and abundant biopolymer named alginate acted as sacrificial templates, providing porous structures and controlling the morphology of TiO2nanoparticles. The size of the resultant TiO2nanoparticles was around 20 nm. The TiO2 structures were obtained by directly crosslinking Ti4+ions to alginate and then burning off the biopolymer templates. Based on the observation of various reactive conditions, we propose that the alginate has two important function in the formation of hierarchically porous TiO2structures. One is acting as a template for the nucleation of TiO2. The other one is to facilitate the formation of porous TiO2nanomaterials. The photocatalytic property of hierarchically porous TiO2in UV-light-driven degradation of organic dyes was proved to be better than that of commercial available TiO2.
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