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Adsorption study of p -nitrophenol on a silver(I) triazolate MOF
Journal of Porous Materials ( IF 2.6 ) Pub Date : 2020-06-10 , DOI: 10.1007/s10934-020-00917-w
Huixia Miao , Shuya Song , Hao Chen , Wenhua Zhang , Runping Han , Guang Yang

In this paper, the potential has been investigated of using the silver(I) 3,5-diphenyltriazolate MOF—AgTz-1 as an adsorbent towards the adsorption of p-nitrophenol (PNP) from water. Based on experimental results, the best adsorption performance can be achieved at room temperature (or slightly elevated temperature) in neutral solution with the adsorption capacity Qmax being 184.8 mg/g (308 K) and 143.5 mg/g (298 K). The adsorption of PNP onto AgTz-1 is pH-dependent: at pH > 8 it can be described by the “one in, one out” anion exchange mechanism; while at pH 7 or less, some neutral 4-nitrophenol molecules may enter the interior of MOF along with 4-nitrophenolate anions via hydrogen-bonding and/or π-π stacking, accompanied by the expansion of MOF structure at higher equilibrium concentrations of PNP at 298 K and 308 K. Moreover, the adsorption efficiency of AgTz-1 remained almost the same after five consecutive cycles of adsorption–desorption.



中文翻译:

对硝基苯酚在三叠氮化银(I)MOF上的吸附研究

在本文中,已经研究了使用3,5-二苯基三偶氮银(I)MOF-AgTz-1作为从水中吸附硝基苯酚(PNP)的吸附剂的潜力。根据实验结果,在室温(或略微升高的温度)的中性溶液中,具有最大吸附容量Q max可获得最佳吸附性能。分别为184.8 mg / g(308 K)和143.5 mg / g(298 K)。PNP在AgTz-1上的吸附是pH依赖性的:在pH> 8时,可以用“一进一出”阴离子交换机理来描述;在pH等于或小于7时,一些中性的4-硝基苯酚分子可能会通过氢键和/或π-π堆积与4-硝基苯酚酸根阴离子一起进入MOF的内部,伴随着PNP平衡浓度较高时MOF结构的扩展在298 K和308 K时。AgTz-1的吸附效率在连续五个吸附-解吸循环后几乎保持不变。

更新日期:2020-06-10
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