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Tunable porous silica nanoparticles as a universal dye adsorbent

机译：可调谐多孔二氧化硅纳米粒子作为通用染料吸附剂

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Here, we report selective adsorption of cationic dyes methylene blue (MB) and rhodamine B (RB) and anionic dyes methyl orange (MO) and bromo cresol green (BCG) by modifying the surface of cetyl trimethyl ammonium bromide (CTAB) coated porous silica nanoparticles (PSN). We used a top down approach to synthesize PSN (porous silica nanoparticles) without high temperature calcination. X-ray diffraction study confirms the formation of pure phase silica nanoparticles. SEM analysis reveals that the particle morphology is spherical and the size range lies in-between 150–200 nm. We have studied the dye adsorption properties for three cases of PSN at varying calcination temperatures of 100 °C, 250 °C and 500 °C, respectively. Thermal study has been performed in the temperature range of 50–800 °C to check the calcination temperature. In this report, we have tuned the surface properties for selective adsorption of cationic and anionic dyes in water. In the first case, 100 °C calcined PSN selectively adsorb only anionic dyes, whereas in the second case, 500 °C calcined PSN adsorb only cationic dyes and finally, an optimized calcination temperature ≈250 °C could be used for all types of dye to be adsorbed irrespective of charges on the dyes. The mode of interaction of dyes with PSN has been explained with a proper mechanism in all three cases. The adsorptions of dyes are confirmed by UV-Vis spectroscopy. Adsorption capacity and regenerable performance of adsorbents have also been studied.
机译：在此，我们通过改变十六甲基三甲基溴化物（CTAB）涂覆的多孔二氧化硅（CTAB）涂覆多孔二氧化硅（CTAB）涂覆多孔二氧化硅（CTAB）涂覆多孔二氧化硅（CTAB）的表面纳米粒子（PSN）。我们使用了一种顶部的方法来合成PSN（多孔硅纳米粒子）而无需高温煅烧。 X射线衍射研究证实纯相二氧化硅纳米粒子的形成。 SEM分析表明，粒子形态是球形，尺寸范围位于150-200nm之间。我们已经研究了在不同煅烧温度为100℃，250℃和500℃的不同煅烧温度下进行三种PSN的染料吸附性能。在50-800℃的温度范围内进行热学研究以检查煅烧温度。在本报告中，我们调整了在水中选择性吸附阳离子和阴离子染料的表面性质。在第一种情况下，100℃煅烧PSN仅选择性吸附阴离子染料，而在第二种情况下，500℃煅烧PSN仅吸附阳离子染料，最后，优化的煅烧温度≈250℃可用于所有类型的染料无论染料对染料电荷如何吸附。已经在所有三种情况下用适当的机制解释了染料与PSN的相互作用模式。通过UV-Vis光谱证实染料的吸附。还研究了吸附能力和可再生性能的吸附性能。

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