Dou Rongni, Zhang Junya, Chen Yuancai, Feng Siyuan
Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
State Key Lab of Pulp and Paper Engineering, School of Light Industry and Engineering, South China University of Technology, Guangzhou, 510640, China.
Environ Sci Pollut Res Int. 2017 Mar;24(9):8778-8789. doi: 10.1007/s11356-017-8583-7. Epub 2017 Feb 18.
In order to expand the potential applications of metal-organic frameworks (MOFs), structure directing agents modified mesoporous MIL-53(Al) (MIL-53(Al)-1) was investigated to adsorb triclosan (TCS) with two different initial concentrations. MIL-53(Al)-1 with high mesoporosity and total pore volume exhibited higher adsorption capacity and 4.4 times faster adsorption of TCS at low concentration (1 mg L) than that of microporous MIL-53(Al). Also, mesoporous as well as microporous MIL-53(Al) showed significant higher adsorption capacity and two orders of magnitude greater fast uptake of TCS than two kinds of mesoporous-activated carbon. The adsorption of TCS onto MIL-53(Al)-1 released more energy and had higher disorderliness than TCS on MIL-53(Al). The superior adsorption characteristics of MIL-53(Al)-1 were preserved over a wide pH range (4-9), at high concentration of ionic strengths, and in the presence of coexisting compounds (anions, cations, phenol, aniline, and humic acid). The selectivity adsorption and Fourier transform infrared (FT-IR) spectra revealed that TCS adsorption on MIL-53(Al)s was mainly driven by hydrophobicity interaction assisted with hydrogen bonding on MIL-53(Al)s. MIL-53(Al)s can be effectively regenerated several times by washing with 90% methanol-water (pH 11). All of the above results demonstrated MIL-53(Al)s are promising adsorbents for water purification. Graphical abstract.
为了拓展金属有机框架材料（MOFs）的潜在应用，研究了结构导向剂修饰的介孔MIL-53(Al)（MIL-53(Al)-1）对两种不同初始浓度三氯生（TCS）的吸附性能。具有高介孔率和总孔体积的MIL-53(Al)-1在低浓度（1 mg/L）下对TCS的吸附容量更高，吸附速度比微孔MIL-53(Al)快4.4倍。此外，介孔和微孔MIL-53(Al)对TCS的吸附容量均显著高于两种介孔活性炭，快速吸附量高出两个数量级。TCS在MIL-53(Al)-1上的吸附释放出更多能量，无序度也高于在MIL-53(Al)上的吸附。MIL-53(Al)-1的优异吸附特性在较宽的pH范围（4 - 9）、高离子强度以及存在共存化合物（阴离子、阳离子、苯酚、苯胺和腐殖酸）的情况下都能保持。选择性吸附和傅里叶变换红外（FT-IR）光谱表明，TCS在MIL-53(Al)上的吸附主要由疏水相互作用驱动，并伴有MIL-53(Al)上的氢键作用。用90%甲醇 - 水（pH =11）洗涤可使MIL-53(Al)有效再生多次。上述所有结果表明，MIL-53(Al)是用于水净化的有前景的吸附剂。图形摘要。
