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Facile Synthesis, Characterization, and Adsorption Insights of Lanthanum Oxide Nanorods
Metals ( IF 2.9 ) Pub Date : 2020-07-24 , DOI: 10.3390/met10081001
Lakshmi Prasanna Lingamdinne , Janardhan Reddy Koduru , Yoon-Young Chang , Seon-Hong Kang , Jae-Kyu Yang

This study synthesized lanthanum oxide (La2O3) nanorods to develop a practical approach for the removal of arsenic from groundwater. La2O3 nanorods were synthesized by a simple hydrothermal process followed by calcination at 500 °C and were characterized by spectroscopic and microscopic techniques. To evaluate the adsorption mechanism of La2O3 nanorods, adsorption parameters including solution pH, temperature, equilibrium isotherms, and kinetics for arsenic were studied. The results suggested that the arsenic uptake was a rate-limiting, monolayer adsorption interaction on the La2O3 nanorods homogeneous surface. In addition, it was found that the adsorptive removal behavior of La2O3 for As(V) was sensitive to the initial pH and temperature, and the maximum uptake amount of as prepared La2O3 was found to be 260.56 mg/g of As(V) at pH 6.0 and 25 °C. Furthermore, the uptake capacity of La2O3 nanorods for As(V) increased with temperature. The resultant thermodynamic parameters (ΔG0, ΔH0, and ΔS0) suggested an endothermic adsorption of As(V) on La2O3. The adsorption capacity of La2O3 was higher than that of several reported nanocomposites, suggesting its practical applicability and novelty for As-contaminated wastewater treatment.

中文翻译:

氧化镧纳米棒的简便合成,表征和吸附见解

这项研究合成了氧化镧(La 2 O 3)纳米棒,以开发一种从地下水中去除砷的实用方法。La 2 O 3纳米棒通过简单的水热法合成,然后在500°C下煅烧,并通过光谱学和显微技术表征。为了评估La 2 O 3纳米棒的吸附机理,研究了溶液的pH,温度,平衡等温线和砷动力学等吸附参数。结果表明,砷的吸收是La 2 O 3上的限速单层吸附相互作用。纳米棒均匀的表面。另外,发现La 2 O 3对As(V)的吸附去除行为对初始pH和温度敏感,发现所制备的La 2 O 3的最大吸收量为260.56 mg / g。 pH 6.0和25°C时的As(V)含量 此外,La 2 O 3纳米棒对As(V)的吸收能力随温度的升高而增加。将得到的热力学参数(ΔG 0ΔH 0,和ΔS 0)的La建议作为(V)的吸热吸附2 ö 3。La 2的吸附容量O 3高于一些报道的纳米复合材料,表明其在被As污染的废水处理中具有实用性和新颖性。
更新日期:2020-07-24
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