Knitted Microporous Polymers as Efficient Adsorbents for Wastewater Treatment: Effects of Skeleton Structure and Pore Distribution

【摘要】 Hyper-cross-linked microporous organic polymers（MOP） with controlled skeleton structure and pore distribution were prepared by Friedel-Crafts alkylation reaction. The hyper-cross-linked polymers（HCPs） produced by knitting aromatic functional groups posses the typical micro-and meso-porous composite structure and specific surface areas of up to 957 m²·g^-1. The obtained materials were evaluated as adsorbents for methylene blue（MB） and subjected to several batch adsorption tests to investigate the effects of adsorbent dosage, concentration of MB, temperature, and pH on MB removal. The maximum adsorbed capacity（q_m） of KAPs-Ph(381 mg·g^-1, knitted using benzene) exceeded those of less mesoporous KAPs-PhPh₃(310 mg·g^-1 knitted using 1,3,5-triphenylbenzene) and chloromethyl polystyrene resin(58 mg·g^-1). Moreover, KAPs-Ph could be regenerated by Soxhlet extraction with ethanol and reused for up to 15 times with minimal loss of adsorption capacity. The results illustrate that adsorption performance can be improved by controlling the pore structure of the adsorbing materials, and KAPs-Ph has a potential application values for the industrial removal of organic dyes from wastewater.更多还原

【Abstract】 Hyper-cross-linked microporous organic polymers（MOP） with controlled skeleton structure and pore distribution were prepared by Friedel-Crafts alkylation reaction. The hyper-cross-linked polymers（HCPs） produced by knitting aromatic functional groups posses the typical micro-and meso-porous composite structure and specific surface areas of up to 957 m²·g^-1. The obtained materials were evaluated as adsorbents for methylene blue（MB） and subjected to several batch adsorption tests to investigate the effects of adsorbent dosage, concentration of MB, temperature, and pH on MB removal. The maximum adsorbed capacity（q_m） of KAPs-Ph(381 mg·g^-1, knitted using benzene) exceeded those of less mesoporous KAPs-PhPh₃(310 mg·g^-1 knitted using 1,3,5-triphenylbenzene) and chloromethyl polystyrene resin(58 mg·g^-1). Moreover, KAPs-Ph could be regenerated by Soxhlet extraction with ethanol and reused for up to 15 times with minimal loss of adsorption capacity. The results illustrate that adsorption performance can be improved by controlling the pore structure of the adsorbing materials, and KAPs-Ph has a potential application values for the industrial removal of organic dyes from wastewater.更多还原