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首页> 外文期刊>Environmental Engineering Science >Calcined Layered Double Hydroxides for Decolorization of Azo Dye Solutions: Equilibrium, Kinetics, and Recycling Studies
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Calcined Layered Double Hydroxides for Decolorization of Azo Dye Solutions: Equilibrium, Kinetics, and Recycling Studies

机译：用于偶氮染料溶液脱色的煅烧层状双氢氧化物：平衡，动力学和再循环研究

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This work presents results on the sorption of the azo dyes Remazol Yellow GR110 and Remazol Golden YellownRNL onto calcined MgAl-CO3 hydrotalcite under different pH (7 and 11) and temperature (25u0002C and 40u0002C)nconditions. In addition to isotherm and kinetic data, this work also shows results on two techniques (thermalnand ion exchange) for hydrotalcite regeneration. The Langmuir isotherm and the pseudo-second-order kineticsnfit best the experimental data for both anionic dyes, resulting in a qmax of 106.3mg/g (0.18 mmol/g) for RemazolnYellow GR110 and a qmax of 657.2 mg/g (1.1mmol/g) for Remazol Golden Yellow RNL at the best adsorptionnconditions (25u0002C and pH= 7). Results on layered double hydroxides (LDH) characterization (X-ray diffraction,nFourier-transformed infrared Spectroscopy (FTIR) indicate that the azo dyes did not intercalate into the LDH butnwere rather adsorbed onto its surface. Thermal recycling reduced the LDH adsorption capacity by 20% to 30%nper cycle due to incomplete dye decomposition during the treatment at 500u0002C. Likewise, the recycling ofnhydrotalcite via ion exchange was fairly ineffective, as the efficiencies for dye recovery were 15%, 20% and 30%nwhen chloride, hydroxyl and carbonate anions were respectively used as exchangers.
机译：这项工作提出了在不同pH（7和11）和温度（25u0002C和40u0002C）n条件下将偶氮染料Remazol Yellow GR110和Remazol Golden YellownRNL吸附到煅烧的MgAl-CO3水滑石上的结果。除等温线和动力学数据外，这项工作还显示了两种水滑石再生技术（热和离子交换）的结果。 Langmuir等温线和拟二级动力学最适合两种阴离子染料的实验数据，因此RemazolnYellow GR110的qmax为106.3mg / g（0.18 mmol / g），qmax为657.2 mg / g（1.1mmol / g）。 g）最佳吸附条件（25u0002C和pH = 7）下的Remazol金黄色RNL。层状双氢氧化物（LDH）表征的结果（X射线衍射，傅立叶变换红外光谱（FTIR））表明，偶氮染料没有嵌入LDH中，而是被吸附在其表面上，热循环使LDH的吸附能力降低了20由于在500u0002C的处理过程中染料分解不完全，因此每个循环中有30％到30％的循环。同样，通过离子交换对水滑石进行回收是相当无效的，因为氯化物，羟基和碳酸盐时染料的回收率分别为15％，20％和30％。阴离子分别用作交换剂。

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