Ultralight MgO and its Efficient Adsorption to Pb~(2+) and Mn~(2+)

Yichang Liu; Deng Zhang; Pei Xie

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Ultralight MgO and its Efficient Adsorption to Pb~(2+) and Mn~(2+)

机译：超轻MgO及其高效吸附于Pb〜（2+）和Mn〜（2+）

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Background and Objective: In this work, the precipitation combined with vacuum drying and supercritical CO2 drying was applied in the preparation of Mg(OH)2 which was thermally decomposed to MgO. Results: Results showed that the constant dropping rate of Mg(NO3)2 solution into NaOH aqueous solution under 90°C with a relatively high pH of 10.1 led to the MgO powder with high specific surface area and large pore volume with both vacuum drying and supercritical drying. Among the produced MgO, the pore volume 1.45 cm~3/g from the vacuum drying was the highest, and the bulk density 0.0247 g/ml from the supercritical drying was the lowest in the reported literature. Conclusion: Particularly, the MgO produced from the supercritical drying showed high adsorption of Pb2+ (as high as 3635 mg/g at pH=6 and 25°C) and Mn2+ (as high as 861 mg/g at pH=6 and 25°C). The adsorption isotherms and kinetics of Pb2+ and Mn2+ on the produced MgO were fitted well to the Langmuir model and pseudo-second order model.

机译：背景和目的：在这项工作中，将与真空干燥和超临界CO2干燥结合的沉淀物在Mg（OH）2的制备中，其热分解为MgO。结果结果：结果表明，Mg（NO3）2溶液在90℃下的NaOH水溶液中的恒定滴加率为10.1的含量相对较高的pH导致MgO粉末，具有高比表面积和大的孔隙体积，具有真空干燥和超临界干燥。在生产的MgO中，从真空干燥中的孔体积1.45cm〜3 / g是最高的，并且来自超临界干燥的堆积密度0.0247g / ml是报告的文献中最低的。结论：特别是，由超临界干燥产生的MGO显示出高吸附PB2 +（高达3635mg / g在pH = 6和25℃）和MN2 +（高达861mg / g，pH = 6和25°。 C）。所生产的MgO上的PB2 +和MN2 +的吸附等温线和动力学对Langmuir模型和伪二次阶模型很好。

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来源
《Recent Patents on Chemical Engineering》 |2017年第1期|共9页
作者
Yichang Liu; Deng Zhang; Pei Xie;
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作者单位

Department of Chemical and Biochemical Engineering College of Chemistry and Chemical Engineering Xiamen University National Engineering Laboratory for Green Chemical Productions of Alcohols Ethers and Esters Xiamen 361005 P.R. China;

Department of Chemical and Biochemical Engineering College of Chemistry and Chemical Engineering Xiamen University National Engineering Laboratory for Green Chemical Productions of Alcohols Ethers and Esters Xiamen 361005 P.R. China;

Department of Chemical and Biochemical Engineering College of Chemistry and Chemical Engineering Xiamen University National Engineering Laboratory for Green Chemical Productions of Alcohols Ethers and Esters Xiamen 361005 P.R. China;

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正文语种 eng
中图分类化学工业;
关键词
Adsorption; lead; manganese; magnesium oxide; supercritical drying; silica;

机译：吸附;带领;锰;氧化镁;超临界干燥;二氧化硅;

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Ultralight MgO and its Efficient Adsorption to Pb~(2+) and Mn~(2+)

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