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首页> 外文期刊>RSC Advances >Hydrophobic bifunctionalized hexagonal mesoporous silicas as efficient adsorbents for the removal of Orange IV
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Hydrophobic bifunctionalized hexagonal mesoporous silicas as efficient adsorbents for the removal of Orange IV

机译：疏水性双官能化六角形介孔二氧化硅作为去除橙色IV的有效吸附剂

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摘要

A novel hydrophobic bifunctionalized hexagonal mesoporous silica (Ph-Am-HMS) material was synthesized with the simultaneous immobilization of phenyl and amino groups on its surface. The composition and structure of Ph-Am-HMS were studied by FT-IR, XRD, N-2 adsorption-desorption, and sessile water droplet contact angle measurements, etc., which revealed that this novel bifunctionalized material showed hydrophobicity and good porous properties. When applied to the adsorption of the azo dye Orange IV in aqueous solutions, Ph-Am-HMS exhibited a high adsorption capacity and a rapid adsorption rate. The theoretical maximum adsorption capacity could reach 246.3 mg g(-1) in 60 min at 293 K. A kinetic study indicated that the adsorption of Orange IV on Ph-Am-HMS fitted perfectly to the Freundlich adsorption model and followed pseudo-second-order kinetics. The changes in Gibbs free energy (-10.55 kJ mol(-1)), enthalpy (-7.06 kJ mol(-1)), and entropy (11.83 J mol(-1) K-1) at 293 K showed that the adsorption process was spontaneous and exothermic.
机译：合成了一种新型的疏水性双官能化六角形介孔二氧化硅（Ph-Am-HMS）材料，同时将苯基和氨基固定在其表面上。通过FT-IR，XRD，N-2吸附-解吸和无水水滴接触角等方法研究了Ph-Am-HMS的组成和结构，表明该新型双功能材料具有疏水性和良好的多孔性。 。当用于偶氮染料Orange IV在水溶液中的吸附时，Ph-Am-HMS表现出高吸附容量和快速吸附速率。在293 K下60分钟内，理论最大吸附容量可达到246.3 mg g（-1）。动力学研究表明，Ph-Am-HMS上的Orange IV吸附完全符合Freundlich吸附模型，并遵循伪秒-吸附法。秩序动力学。在293 K下吉布斯自由能（-10.55 kJ mol（-1）），焓（-7.06 kJ mol（-1））和熵（11.83 J mol（-1）K-1）的变化表明吸附过程是自发的并且放热的。

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