“…The catalyst/support (Fe-Co/CaCO 3 ) was prepared by impregnation method [12]. In the first step, commercial CaCO 3 was milled for 10 h to decrease the crystallite size and increase the surface area (see Table 3).…”
Water pollution is a worldwide issue for the ecoenvironment and human society. Removal of various pollutants including heavy metals from the environment is a big challenge. Techniques of adsorption are usually simple and work effectively. In the current study, MWCNTs were prepared by chemical vapor deposition (CVD) of acetylene at 600°C. Fe-Co/CaCO 3 catalyst/support was prepared by wet impregnation method. The crystal size of the catalyst was identified using XRD. Acidified functionalized multiwalled carbon nanotubes (MWCNT) were produced from oxidation of multi-walled carbon nanotubes by mixture of H 2 O 2 ? HNO 3 in a ratio of 1:3 (v/v) at 25°C. The structure and purity of synthesized functionalized CNTs were examined by TEM, N 2 -BET method and thermogravimetric analysis. The functional groups produced at CNTs surface were investigated using FTIR spectroscopy.
“…The catalyst/support (Fe-Co/CaCO 3 ) was prepared by impregnation method [12]. In the first step, commercial CaCO 3 was milled for 10 h to decrease the crystallite size and increase the surface area (see Table 3).…”
Water pollution is a worldwide issue for the ecoenvironment and human society. Removal of various pollutants including heavy metals from the environment is a big challenge. Techniques of adsorption are usually simple and work effectively. In the current study, MWCNTs were prepared by chemical vapor deposition (CVD) of acetylene at 600°C. Fe-Co/CaCO 3 catalyst/support was prepared by wet impregnation method. The crystal size of the catalyst was identified using XRD. Acidified functionalized multiwalled carbon nanotubes (MWCNT) were produced from oxidation of multi-walled carbon nanotubes by mixture of H 2 O 2 ? HNO 3 in a ratio of 1:3 (v/v) at 25°C. The structure and purity of synthesized functionalized CNTs were examined by TEM, N 2 -BET method and thermogravimetric analysis. The functional groups produced at CNTs surface were investigated using FTIR spectroscopy.
“…There are well-developed methods of introduction of catalytically active metal nanoparticles into oxide matrixes, but subsequent deposition of the matrix uniformly on the reactor walls is still a very challenging task, especially for concentrated sols and long reactors. [21][22][23] Two main methods are used to obtain a uniform coating on a substrate: spin-and dip-coating. In the spin-coating technique, the substrate is first covered with an excess of precursor solution that is later removed by centrifugal forces leaving a thin uniform coating after solvent evaporation.…”
“…This is a homogeneous process which results in a continuous transformation of a solution into a hydrated solid precursor (hydrogel). Sol-gel methods have been recognized for their versatility which allows control of the texture, composition, homogeneity, and structural properties of the finished solids [31]. Pd-doped SnO 2 -based sensor was obtained by Lim using sol-gel process.…”
Section: Literature Review Modification Vs Doping For Selectivity Immentioning
Modification and doping are both terms which used to display improvement of sensory characteristics of materials, particularly their selectivity. But these processes are different in the way how they influence on material's properties. This review concentrates on differences between modification and doping and their impact on parameters of sensitive materials for semiconductor gas sensors, in particular on characteristics of SnO 2 as one of the most promising sensor material.
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