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首页> 外文期刊>Materials Science and Engineering >Synthesis of Na-, Fe-, and Mg-containing titanate nanocomposites starting from ilmenite and NaOH and adsorption kinetics, isotherms, and thermodynamics of Cu(Ⅱ), Cd(Ⅱ), and Pb(Ⅱ) cations
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Synthesis of Na-, Fe-, and Mg-containing titanate nanocomposites starting from ilmenite and NaOH and adsorption kinetics, isotherms, and thermodynamics of Cu(Ⅱ), Cd(Ⅱ), and Pb(Ⅱ) cations

机译：从钛铁矿和氢氧化钠开始合成含钠，铁和镁的钛酸酯纳米复合材料以及Cu（Ⅱ），Cd（Ⅱ）和Pb（Ⅱ）阳离子的吸附动力学，等温线和热力学

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摘要

Nanosized titanate composites (NaxFeyMgiTiOz) were synthesized using ilmenite and NaOH as the starting materials with the NaOH/TiO2 molar ratios of 1.1-1.6 by solid state route. When the calcination temperature was raised to 800 degrees C, sodium iron titanate phase was completely evolved with the formula of Na0.61-0.70Fe0.97Mg0.07-0.08TiO3.76-3.81. Further increasing the calcination temperature to 900 degrees C, titanate nanorods with the formula of Na0.79.0.82Fe0.96-0.98Mg0.07-0.08TiO3.(85-3.88) were formed. The adsorption of Cu(II), Cd(II), and Pb (II) ions on titanate nanocomposite was well fitted by the pseudo-second-order adsorption kinetic and Langmuir adsorption models. At 20 degrees C, the maximum adsorption capacities of the titanate nanocomposite for Cu(II), Cd(II), and Pb(II) ions were 13.8, 8.8, and 20.3 mg g(-1), respectively. The thermodynamic parameters revealed that the adsorption of these ions was spontaneous and endothermic.
机译：以钛铁矿和NaOH为起始原料，通过固态法合成了NaOH / TiO2摩尔比为1.1-1.6的纳米级钛酸盐复合材料（NaxFeyMgiTiOz）。当煅烧温度升高到800℃时，钛酸钠铁相完全放出，分子式为Na0.61-0.70Fe0.97Mg0.07-0.08TiO3.76-3.81。进一步将煅烧温度提高至900℃，形成了分子式为Na0.79.0.82Fe0.96-0.98Mg0.07-0.08TiO3（85-3.88）的钛酸酯纳米棒。拟二阶吸附动力学和Langmuir吸附模型很好地拟合了钛酸酯纳米复合材料上Cu（II），Cd（II）和Pb（II）离子的吸附。在20摄氏度时，钛酸酯纳米复合材料对Cu（II），Cd（II）和Pb（II）离子的最大吸附容量分别为13.8、8.8和20.3 mg g（-1）。热力学参数表明这些离子的吸附是自发的并且是吸热的。

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