4.7 Article

Application of MCM-48 with large specific surface area for VOCs elimination: synthesis and hydrophobic functionalization for highly efficient adsorption

Journal

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 22, Pages 33595-33608

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-17356-y

Keywords

MCM-48; Large specific surface area; Functionalization; Toluene; Adsorption; Hydrophobic

Funding

  1. Program for Fundamental Research Funds for the Central Universities [FRF-IDRY-20-004]
  2. Opening Fund of State Key Laboratory of Heavy Oil Processing [SKLOP202002001]
  3. National Natural Science Foundation of China [U20A20130]

Ask authors/readers for more resources

In this study, MCM-48 molecular sieve was used for the removal of volatile organic compounds (VOCs) through adsorption. The adsorption capacity of toluene was significantly reduced under wet conditions, and the affinity to toluene was improved through functionalization methods. The functionalized MCM-48 materials showed high adsorption capacity and stability, with co-condensation method yielding the best adsorption performance.
MCM-48 molecular sieve with a large specific area (1470.87 m(2)/g) was hydrothermally synthesized for VOCs elimination by the adsorption method. The dynamic adsorption behaviors of toluene on this material were evaluated via breakthrough curves under both dry and wet conditions. A high toluene adsorption capacity of 171.13 mg/g was observed under dry conditions; however, in the presence of water vapor (20% RH), the adsorption capacity greatly decreased to 58.88 mg/g due to the competitive occupation of adsorption sites between water molecules and toluene molecules. To improve the affinity to toluene, functionalized MCM-48 materials were obtained by the co-condensation method and grafting method, respectively. It was found that co-M48(1:5)-100/48 sample by co-condensation method presents the highest dynamic adsorption capacity at both dry condition (194.62 mg/g) and 20% RH (122.42 mg/g), which has a significant advantage in the same type of adsorbent. This could be ascribed to the conjugated t-electrons effect between aromatic rings of phenyl groups uniformly distributed in MCM-48 skeleton and toluene molecules, which was qualitatively confirmed by FTIR. Moreover, cycle tests confirmed that this adsorbent possesses superior stability. The Yoon-Nelson model was successfully employed to describe the dynamic adsorption behavior of toluene over the organofunctionalized MCM-48 adsorbents, and the adsorption force of toluene was explained. Finally, a diagram describing the effect of different functionalization methods on the hydrophobicity and organophilicity of MCM-48 was given for a better understanding.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available