Organosilica Nanoparticles with an Intrinsic Secondary Amine: An Efficient and Reusable Adsorbent for Dyes.
Organosilica Nanoparticles with an Intrinsic Secondary Amine: An Efficient and Reusable Adsorbent for Dyes.
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DOI：
10.1021/acsami.7b04181
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发表时间：
2017-05-10
影响因子：
9.5
通讯作者：
Jokerst JV
中科院分区：
文献类型：
--
作者：
Chen F;Zhao E;Kim T;Wang J;Hableel G;Reardon PJT;Ananthakrishna SJ;Wang T;Arconada-Alvarez S;Knowles JC;Jokerst JV
纳米材料由于其大的表面积和独特的性质，在水修复中是有前途的工具。我们合成了一种有机硅纳米颗粒（OSNP），并调整其组成用于阴离子染料去除。吸附机理是OSNP上的胺与染料之间的静电吸引和氢键，并且OSNP的表面电荷可以被调节以吸附阴离子或阳离子染料。以苯酚红为模型染料，研究了胺基、pH、离子强度、时间、染料浓度和纳米材料质量对吸附的影响。理论最大吸附容量计算为175.44 mg/g（0.47 mmol/g），高于77种已报道吸附剂中的67种。实验最大吸附容量为201 mg/g（0.53 mmol/g）左右。此外，纳米颗粒是高度可重复使用的，并且在至少10个循环中显示出稳定的染料去除和回收效率。总之，衍生自OSNP框架内的固有胺基的新型吸附剂系统对于具有高吸附容量和快速吸附的阴离子或阳离子染料是可重复使用和可调节的。这些材料也可用于药物递送或作为成像剂的载体。
Nanomaterials are promising tools in water remediation because of their large surface area and unique properties compared to bulky materials. We synthesized an organosilica nanoparticle (OSNP) and tuned its composition for anionic dye removal. The adsorption mechanisms are electrostatic attraction and hydrogen bonding between the amine on OSNP and the dye, and the surface charge of the OSNP can be tuned to adsorb either anionic or cationic dyes. Using phenol red as a model dye, we studied the effect of the amine group, pH, ionic strength, time, dye concentration, and nanomaterial mass on the adsorption. The theoretical maximum adsorption capacity was calculated to be 175.44 mg/g (0.47 mmol/g), which is higher than 67 out of 77 reported adsorbents. The experimental maximum adsorption capacity is around 201 mg/g (0.53 mmol/g). Furthermore, the nanoparticles are highly reusable and show stable dye removal and recovery efficiency over at least 10 cycles. In summary, the novel adsorbent system derived from the intrinsic amine group within the frame of OSNP are reusable and tunable for anionic or cationic dyes with high adsorption capacity and fast adsorption. These materials may also have utility in drug delivery or as a carrier for imaging agents.