Adsorption properties of benzene and water vapor on hyper-cross-linked polymers

Abstract

A series of hyper-cross-linked polymers (HCPs) was synthesized via a post-cross-linking reaction using lowcross-linked polydivinylbenzene (PDVB) as precursor and 4,4 0 -bis(chloromethyl)biphenyl (BCMBP) as crosslinking reagent. The effects of various amounts of BCMBP on the structures of the hyper-cross-linked polymers were discussed. The resultant typical HCP-1.3 possesses hierarchical micro/meso pore structures and a high stability up to 400 C. The increased specific surface area and total pore volume of HCP-1.3, which reach 1231 m 2 g À1 and 1.99 cm 3 g À1 , respectively, imply the high cross-linking ability of BCMBP.In order to study the adsorption properties of HCP-1.3, benzene and water were selected as typical adsorbates for their non-polar and polar characteristics. The static adsorption amount of benzene on HCP-1.3 is 30.0 mmol g À1, which is two times higher than the corresponding adsorbed water amount, suggesting a potential hydrophobic property of HCP-1.3. Dynamic adsorption was performed with a fixed-bed column to simulate the real situation under dry and 30% relative humidity conditions. The results show the dynamic adsorption amount under the 30% relative humidity condition is as high as 90% of the value under dry conditions, implying HCP-1.3 would be a promising adsorbent for VOC adsorption under both dry and humid conditions.

Synthesis of novel hyper-cross-linked polymers as adsorbent for removing organic pollutants from humid streams

“…1. It is observed that all the samples show a type I isotherm according to IUPAC classifications and the initial parts of the adsorption isotherms of all samples show a steep increase in nitrogen gas uptake (p/p 0 < 0.01), indicating abundant microporous structure [22,26]. Compared with other samples, the adsorption isotherms of HCP-0.5 exhibit a remarkable rise and the desorption branch of the hysteresis loop is steeper than the adsorption branch at higher relative pressure (p/p 0 = 0.3-1.0), indicating that a range of larger mesopores are presented in this polymeric material [27].…”

“…The synthesized HCP-1.3 has high surface area, large pore volume and showed a good adsorption for benzene under water condition due to its high hydrophobic property. However, in our previous paper [22], we only studied the effect of the dynamic adsorption of benzene vapor containing 30% water vapor, and did not investigate the dynamic adsorption behavior of benzene on HCP-1.3 under higher humid conditions. In the latest work [23], we synthesized a conjugated polymer adsorbent with pure carbon chain backbone, which had excellent hydrophobicity and higher adsorption capacity of benzene than activated carbon.…”

“…In our previous paper [22], we synthesized a series of hyper-cross-linked polymers (HCPs) via a post-cross-linking reaction using low cross-linked polydivinylbenzene (PDVB) as precursor and 4,4 0 -bis(chloromethyl)biphenyl (BCMBP) as crosslinking reagent. The synthesized HCP-1.3 has high surface area, large pore volume and showed a good adsorption for benzene under water condition due to its high hydrophobic property.…”

“…The benzene concentrations in the feed and effluent streams were recorded on a gas chromatograph (GC) supplied by Agilent equipped with a flame ionization detector (FID) after being separated in an AB-GASPRO capillary column and the breakthrough curves were collected. The benzene adsorbed amounts by the sample which was packed in the column were calculated by the following equation [22]:…”

Reactive-Template Inducedin-situHypercrosslinking Procedure to Hierarchical Porous Polymer and Carbon Materials

“…These HPP and HPC materials could hold considerable promise in applications as advanced adsorbents, catalyst supports, energy-storage materials and others. [13,14] 、药物控释 [15,16] 、催化 [17,18] 、能源 [19,20] 以及 环境保护 [21,22] 等领域具有广泛的应用前景. [23,24] .…”