Preparation of Composite Filters Based on Porous Coordination Polymers by Using a Vacuum Filtration Method for Highly Efficient Removal of Particulate Matters

Abstract

In this study, two novel crystal materials pcp1 and pcp1‐L have been synthesized successfully. The different conformations of the two crystals are mainly attributed to the introduction of the Schiff‐base ligand L (L=(E)‐4‐methyl‐N‐((6‐methoxypyridin‐2‐yl)methylene)aniline). Subsequently, pcp1 and pcp1‐L composites have been firstly produced by a vacuum filtration method on various substrates (i.e., melamine foam, plastic mesh, carbon fiber cloth and glass cloth). The obtained robust composites show excellent performance in removing PMs owing to high ζ potential, microporous structure, large conjugation system and electron cloud‐exposed metal center (DFT calculations) of pcp1 and pcp1‐L. Particularly, pcp1‐L@glass cloth with low pressure drop exhibits high thermal stability and high long‐term reproducibility. Additionally, the high removal efficiency of pcp1‐L@glass cloth towards particulate matters could also be maintained, even achieving >99.9 % in the car exhaust gas field test.

Ionic Salts@Metal–Organic Frameworks: Remarkable Component to Improve Performance of Fabric Filters to Remove Particulate Matters from Air

“…Carbonaceous PMs have a polar outside composed of a few FGs like CO, O−H, N−H, etc. 13,33,52 In this work, the captured carbonaceous PMs (after 12 h of filtration with CaCl 2 (20)@MIL-101/cotton) were analyzed with FTIR; polar FGs like CO and N−H were confirmed (Figure 6), in agreement with previous works. 13,33,52 So far, the interactions between PMs and filters were explained with a few mechanisms including electrostatic interactions (ESIs).…”

“…13,33,52 In this work, the captured carbonaceous PMs (after 12 h of filtration with CaCl 2 (20)@MIL-101/cotton) were analyzed with FTIR; polar FGs like CO and N−H were confirmed (Figure 6), in agreement with previous works. 13,33,52 So far, the interactions between PMs and filters were explained with a few mechanisms including electrostatic interactions (ESIs). 30,35,53−55 The loaded ionic (or charged) species might be an active interaction (via ESI) site with PMs, which also have charges (like SNA) or polar FGs on the surface of carbonaceous PMs.…”

“…On the other hand, PMs like SNA usually have charges. Carbonaceous PMs have a polar outside composed of a few FGs like CO, O–H, N–H, etc. ,, In this work, the captured carbonaceous PMs (after 12 h of filtration with CaCl 2 (20)@MIL-101/cotton) were analyzed with FTIR; polar FGs like CO and N–H were confirmed (Figure ), in agreement with previous works. ,, So far, the interactions between PMs and filters were explained with a few mechanisms including electrostatic interactions (ESIs). ,,− The loaded ionic (or charged) species might be an active interaction (via ESI) site with PMs, which also have charges (like SNA) or polar FGs on the surface of carbonaceous PMs. However, ISs are not very effective in PM removal, if they are poorly dispersed (for example, without support on a suitable porous material) or exist in a high content, because charged species are not separated well from each other.…”

Removal of Particulate Matters by Using Zeolitic Imidazolate Framework-8s (ZIF-8s) Coated onto Cotton: Effect of the Pore Size of ZIF-8s on Removal

“…This means that there might be small interaction sites on large PMs that can be intruded onto the pore of MOFs for interaction. To understand the characteristics of PMs, FT-IR was applied to check the properties of the captured PM, after filtration for 12 h. As presented in Figure , the PMs have a few polar bonds like CO, CO, and NH, which is agreeable with earlier reports. , Moreover, PMs, derived from burned incense, are composed of carbonaceous materials with polar outside (and nonpolar inside), as has been reported earlier. ,,, Therefore, the structure of the captured PM in this study can be described as carbons with polar outside (because of CO, CO, and NH bonds) (Scheme a).…”

“…30,31 Moreover, PMs, derived from burned incense, are composed of carbonaceous materials with polar outside (and nonpolar inside), as has been reported earlier. 13,30,31,65 Therefore, the structure of the captured PM in this study can be described as carbons with polar outside (because of CO, CO, and NH bonds) (Scheme 2a).…”