Hyper-crosslinked b -cyclodextrin porous polymer: an adsorption-facilitated molecular catalyst support for transformation of water-soluble aromatic molecules †
Hyper-crosslinked b -cyclodextrin porous polymer: an adsorption-facilitated molecular catalyst support for transformation of water-soluble aromatic molecules †
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发表时间：
2015
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通讯作者：
Haiying Li;Bo Meng;S. Chai;Honglai Liu;Sheng Dai
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作者：
Haiying Li;Bo Meng;S. Chai;Honglai Liu;Sheng Dai
开发了一种合成高孔隙率和高热稳定性环糊精聚合物的新方法。所得多孔聚合物在吸附水中的芳香族分子方面表现出很高的效率，并且还可以作为金纳米颗粒的智能载体用于吸附分子的催化转化。通过B -环糊精的苄基化反应和Friedel-Crafts烷基化交联反应，设计并合成了一种超高交联B -环糊精多孔聚合物（BnCD-HCPP）。BnCD-HCPP显示出极高的BET表面积、大孔体积和高热稳定性，使其成为从水中去除芳香族污染物的高效吸附剂。在0 ~ 100 ppm浓度范围内，以吸附容量与平衡吸附质浓度之比表示的吸附效率为10 3 ~ 10 6 mL g（cid：1）1，比以前报道的其他B -环糊精基吸附剂高一个数量级。吸附物与B -环糊精的摩尔百分比超过300%，表明吸附不仅发生在环糊精空腔中通过1：1络合，而且发生在超交联过程中产生的BnCD-HCPP的纳米孔中。BnCD-HCPP可以通过掺入金纳米颗粒进一步官能化，用于将吸附的酚类化合物如4-硝基苯酚催化转化为4-氨基苯酚。
A novel route to synthesizing cyclodextrin polymers of high porosity and a great thermal stability was developed. The resulting porous polymers show great effi ciency in the adsorption of aromatic molecules from water and also can serve as a smart support for gold nanoparticles for the catalytic transformation of the adsorbed molecules. A hyper-crosslinked b -cyclodextrin porous polymer (BnCD-HCPP) was designed and synthesized facilely by b -cyclodextrin benzylation and subsequent crosslinking via a Friedel – Crafts alkylation route. The BnCD-HCPP shows an extremely high BET surface area, large pore volume, and high thermal stability, making it a highly e ffi cient adsorbent for removal of aromatic pollutants from water. The adsorption e ffi ciency in terms of distribution coe ffi cient, de fi ned as the ratio of adsorption capacity to equilibrium adsorbate concentration, ranged from 10 3 to 10 6 mL g (cid:1) 1 within a concentration of 0 – 100 ppm, one order of magnitude higher than that of other b -cyclodextrin-based adsorbents reported previously. The molar percentage of adsorbate to b -cyclodextrin exceeded 300%, suggesting that the adsorption occurred not only in the cyclodextrin cavities via a 1 : 1 complexation, but also in the nanopores of the BnCD-HCPP created during the hyper-crosslinking. The BnCD-HCPP can be further functionalized by incorporation of gold nanoparticles for catalytic transformation of adsorbed phenolic compounds such as 4-nitrophenol to 4-aminophenol.