| With the rapid development of economy,water pollution has become a serious problem,especially the pollution of organic dyes and heavy metal ions.Adsorption technology has attracted enormous attention,it is of great importance to design and synthesize adsorbents with high efficiency and adsorption capacity used for water environment remediation.Porous organic polymers with the advantages such as high specific surface areas,low density,stable structure and easy functionalization,are promising adsorbents in water remediation.POSS-based organic-inorganic hybrid porous polymers are kind of porous polymers with cubic cage silsesquioxanes.The high specific surface areas and a large number of inorganic siloxanes within the structure are very conducive to the interaction between the adsorbent and heavy metal ions(such as mercury,lead,etc.)and organic dye pollutants in wastewater,and also the functional organic groups can be introduced into the porous structure to further promote the interaction with pollutant molecules to achieve good adsorption removal effect.Therefore,it is of great significance and application value to design and synthesize POSS-based hybrid porous polymers and apply it in water environment remediation.The main contents of this paper are as follows:1.Thiophene-functionalized POSS-based hybrid porous polymer THPP was successfully synthesized by the Heck coupling reaction of heteroatom containing electron-rich heterocyclic compound 2,5-dibromothiophene and rigid polyfunctional octavinyl POSS(OVS)using NaHCO3 as acid absorbent.The results have shown that the specific surface area and pore volume of THPP are up to 915 m2 g-1 and 1.61 cm3 g-1,respectively;the pore structure is hierarchical with micro-mesoporous coexistence.It has good adsorption for carbon dioxide with the uptake of 5.1wt%(1.16mmol g-1)at 273K/lbar.The maximum adsorption capacity of the hybrid porous polymer for toxic organic dye Rhodamine B(RB)and Methylene Blue(MB)was up to 1402 mg g-1 and 862 mg g-1,respectively,which was higher than most of the ever reported adsorbents;and it has a very fast adsorption rate to the dye in aqueous solution.In addition,This hybrid porous polymer has good adsorption properties for heavy metal ions,for example,the maximum adsorption capacity of Ag+ and Hg2+ is 75.5 mg g-1 and 47.2mg g’1,respectively.More importantly,it can effectively remove a variety of pollutants in water and has a good recycling performance.These results suggest potential application of POSS-based hybrid porous polymers in wastewater treatment.2.Two kinds of hybrid porous polymer FHPP-1 and FHPP-2 were prepared by the Heck coupling reaction of fluorinated monomer 1,4-dibromotetrafluorobenzene and OVS using NaHCO3 and Et3N as acid adsorbent,respectively.The surface area of FHPP-1 was 602 m2 g-1,the pore size distribution was hierarchical,and the fluorine content was 23 wt%(close to the theoretical calculated value 25 wt%);while the surface area of FHPP-2 was 325 m2g-1,the pore structure was a microporous structure,which was almost no fluorine(0.37 wt%).The adsorption amount of FHPP-1 and FHPP-2 for CO2 at 273K/lbar was 3.24 wt%(0.74 mmol g’1)and 2.67 wt%(0.61 mmol g-1),respectively.FHPP-1 and FHPP-2 both have good adsorption ability for organic dye RB and MB in aqueous solution,in which FHPP-1 possess higher maximum adsorption capacity(452.5 mg g-1 for RB and 401.6 mg g’1 for MB).Furthermore,they have high adsorption capacity for Pb2+ in water,the maximum adsoiption capacity of FHPP-1 and FHPP-2 for Pb2+was 193.4 mg g-1 and 191.2 mg g-1,respectively.These results demonstrate that POSS-based hybrid porous polymers have great potential application in water treatment. |
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