Details

Autor(en) / Beteiligte

• Zhang, Xiaodong
• Yang, Yang
• Lv, Xutian
• Wang, Yuxin
• Liu, Ning
• Chen, Dan
• Cui, Lifeng

Titel

Adsorption/desorption kinetics and breakthrough of gaseous toluene for modified microporous-mesoporous UiO-66 metal organic framework

Ist Teil von

• Journal of hazardous materials, 2019-03, Vol.366, p.140-150

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• [Display omitted] •Micro-mesoporous UiO-66 was synthesized with P123 as structure-directing agent.•Micro-mesoporous UiO-66 shows 2.6 times toluene adsorption capacity of UiO-66.•Micro-mesoporous structure improves the mass transfer rate and adsorption capacity.•Efficient regeneration of exhausted adsorbent was achieved by heating. In this work, micro-mesoporous UiO-66 was successfully prepared with P123 (EO20PO70EO20) as structure-directing agent by a simple solvothermal method. Adsorption/desorption kinetics of gaseous toluene over pristine UiO-66 and micro-mesoporous UiO-66 were investigated by breakthrough experiments, toluene vapor adsorption isotherm measurements and temperature programmed desorption (TPD) experiments. The interactions between toluene and UiO-66 samples were assessed through the Henry’s law constant (KH) and the isosteric adsorption heat (ΔHads). The micro-mesoporous UiO-66 crystal demonstrated 2.6 times toluene adsorption capacity of the pristine UiO-66 when the P123/Zr4+ molar ratio was 0.2. Results showed that micropore adsorption was the main adsorption process and the larger pores in micro-mesoporous UiO-66 increased molecular diffusion rate and reduced the mass transfer resistance. This result indicated that micro-mesoporous structures and defect sites had a positive effect on toluene molecules capture. The breakthrough times and the working capacities decreased with the increase of the relative humidity and adsorption temperature. A good thermal stability and reproducibility were revealed over the micro-mesoporous UiO-66 in this paper.