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首页> 外文期刊>RSC Advances >Synthesis of nitrogen doped carbon quantum dots/magnetite nanocomposites for efficient removal of methyl blue dye pollutant from contaminated water
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Synthesis of nitrogen doped carbon quantum dots/magnetite nanocomposites for efficient removal of methyl blue dye pollutant from contaminated water

机译：氮掺杂碳量子点/磁铁矿纳米复合材料的合成，用于有效去除污染水中的甲基蓝染料污染物

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As a remedy for environmental pollution, a simple synthesis approach has been developed to prepare nitrogen doped carbon quantum dot/magnetite nanocomposites (Fe _(3) O _(4) @NCQDs NCs) using non-toxic and cost effective lemon juice as precursor for removal of organic dye pollutant. Fe _(3) O _(4) @NCQDs NCs were characterized by using UV-Vis spectroscopy, FTIR, XRD, FESEM, EDS, TEM, VSM and TGA/DTA. TEM results show spherical shaped Fe _(3) O _(4) @NCQDs NCs with an average particle size of 5?nm. Batch adsorption studies were done to investigate the tendency of the nanocomposites to remove representative methyl blue (MB) dye from aqueous solution. The effects of MB dye concentration, dosage of Fe _(3) O _(4) @NCQDs NC adsorbent, pH, contact time and temperature were optimized by varying one variable while all the other parameters were kept constant. The experiment showed rapid removal of MB dye within 20 minutes with an adsorption efficiency of over 90.84% under optimum conditions. The adsorption process fits the Freundlich isotherm model well with R ~(2) and n values of 0.993 and 1.842, respectively, at 298 K indicating the feasibility of the adsorption process. The adsorption process is spontaneous and involves exothermic behaviour as confirmed by thermodynamic studies. From a kinetic study, it was found that the pseudo-second order model is more suitable to describe the adsorption process than the pseudo-first order model for adsorption of MB dye onto Fe _(3) O _(4) @NCQDs NCs.
机译：作为对环境污染的一种补救措施，已开发出一种简单的合成方法，以无毒且经济高效的柠檬汁为前体来制备氮掺杂的碳量子点/磁铁矿纳米复合材料（Fe _（3）O _（4）@NCQDs NCs）。用于去除有机染料污染物。 Fe_（3）O_（4）@NCQDs通过使用紫外-可见光谱，FTIR，XRD，FESEM，EDS，TEM，VSM和TGA / DTA对NC进行表征。 TEM结果表明，球形Fe _（3）O _（4）@NCQDs NCs的平均粒径为5？nm。进行了批量吸附研究，以研究纳米复合材料从水溶液中去除代表性的甲基蓝（MB）染料的趋势。通过改变一个变量来优化MB染料浓度，Fe _（3）O _（4）@NCQDs NC吸附剂的用量，pH，接触时间和温度的影响，而所有其他参数保持恒定。实验表明，在最佳条件下，在20分钟内即可快速去除MB染料，吸附效率超过90.84％。吸附过程非常适合Freundlich等温模型，在298 K下的R〜（2）和n值分别为0.993和1.842，表明了吸附过程的可行性。吸附过程是自发的，并且涉及放热行为，如热力学研究所证实。从动力学研究中发现，伪二级模型比MB-染料在Fe_（3）O_（4）@NCQDs NCs上的吸附拟一级模型更适合描述吸附过程。

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