Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 321, Issue -, Pages 92-102Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.09.004
Keywords
Sustainable silica source; Metal silicate; Hierarchical flower-like; Adsorption; Catalysis
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Funding
- National Natural Science Foundation of China [21677146, 21207136, 11304120, 21505050, 61504048]
- Encouragement Foundation for Excellent Middle-aged and Young Scientist of Shandong Province [BS2014CL012, BS2013CL020]
- Chinese National Fusion Project for ITER [2013GB110005]
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Metal silicates have attracted extensive interests due to their unique structure and promising properties in adsorption and catalysis. However, their applications were hampered by the complex and expensive synthesis. In this paper, three-dimensional (3D) hierarchical flower-like metal silicate, including magnesium silicate, zinc silicate, nickel silicate and cobalt silicate, were for the first time prepared by using rice husks as a sustainable silicon source. The flower-like morphology, interconnected ultrathin nanosheets structure and high specific surface area endowed them with versatile applications. Magnesium silicate was used as an adsorbent with the maximum adsorption capacities of 557.9, 381.3, and 482.8 mg/g for Pb2+, tetracycline (TC), and UO22+, respectively. Ni nanoparticles/silica (Ni NPs/SiO2) exhibited high catalytic activity and good stability for 4-nitrophenol (4 -NP) reduction within only similar to 160 s, which can be attributed to the ultra-small particle size (similar to 6.8 nm), good dispersion and high loading capacity of Ni NPs. Considering the abundance and renewability of rice husks, metal silicate with complex architecture can be easily produced at a large scale and become a sustainable and reliable resource for multifunctional applications. (C) 2016 Elsevier B.V. All rights reserved.
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