کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1331523 979007 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and anion exchange properties of a Zn/Ni double hydroxide salt with a guarinoite structure
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis and anion exchange properties of a Zn/Ni double hydroxide salt with a guarinoite structure
چکیده انگلیسی

In this study, the first route to synthesize a compound with the guarinoite structure (Zn,Co,Ni)6(SO4)(OH,Cl)10·5H2O is reported. Zn/Ni guarinoite is obtained from the reaction of NiSO4·7H2O with solid ZnO in aqueous solution. The resulting green Zn/Ni guarinoite ((Zn3.52Ni1.63)(SO4)1.33(OH7.64)·4.67H2O) was characterized by X-ray diffraction, infrared spectrometry, UV–Visible spectrometry and thermal analysis. It is shown that its structure is similar to the one described for the layered Zn sulfate hydroxide hydrate, i.e. brucite layers with 14 empty octahedra presenting tetrahedrally coordinated divalent atoms above and below the empty octahedra. Ni atoms are located in the octahedra and zinc atoms in tetrahedra and octahedra. In this structure the exchangeable anions are located at the apex of tetrahedra. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations show that the Zn/Ni guarinoite is composed of aggregates of hexagonal plates of several hundreds of nanometers. Due to its interest for industrial or environmental applications, the exchange of sulfate groups by carbonates has been investigated. Results show a limited exchange and a higher affinity of the Zn/Ni guarinoite for sulfates compared to carbonates.

SEM micrograph (secondary electrons) of the synthesized Zn/Ni guarinoite showing that aggregates are composed of small plate-like particles.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 182, Issue 9, September 2009, Pages 2350–2356
نویسندگان
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