CAJ | 학술논문

采用微波辅助磷酸活化制备了高中孔率蔗渣基介孔炭,并通过硝酸氧化和乙二胺聚合在其孔道内修饰了含氮多胺基团,探索了溶液浓度、温度、吸附剂剂量等对改性介孔炭的Pb(II)吸附性能、行为和热力学特性的影响.结果表明,蔗渣基介孔炭较宽的孔道结构可通过乙二胺缩水聚合反应在其表面接枝酰胺、仲胺等含氮基团；胺化改性增强化了介孔炭对水溶液中Pb(II)的固定作用,改性后介孔炭对Pb(II)的吸附量高达180mg/g,是改性前介孔炭的1.5倍；改性介孔炭对Pb(II)的去除率显著增加,对溶液浓度<60mg/L的Pb(II)去除率接近100%.等温吸附与热力学数据表明,胺化改性介孔炭对Pb(II)的吸附位能量存在差异化,吸附是自发的吸热反应过程,温度对铅(II)离子吸附有促进作用,化学作用在吸附过程中发挥了重要作用.
채용미파보조린산활화제비료고중공솔자사기개공탄,병통과초산양화화을이알취합재기공도내수식료함담다알기단,탐색료용액농도、온도、흡부제제량등대개성개공탄적Pb(II)흡부성능、행위화열역학특성적영향.결과표명,자사기개공탄교관적공도결구가통과을이알축수취합반응재기표면접지선알、중알등함담기단；알화개성증강화료개공탄대수용액중Pb(II)적고정작용,개성후개공탄대Pb(II)적흡부량고체180mg/g,시개성전개공탄적1.5배；개성개공탄대Pb(II)적거제솔현저증가,대용액농도<60mg/L적Pb(II)거제솔접근100%.등온흡부여열역학수거표명,알화개성개공탄대Pb(II)적흡부위능량존재차이화,흡부시자발적흡열반응과정,온도대연(II)리자흡부유촉진작용,화학작용재흡부과정중발휘료중요작용.
Biomass-based mesoporous carbons were prepared from bagasse by microwave assisted H3PO4 activation. Polyamine groups were modified on the prepared carbon channels’ surfaces by nitric acid oxidation followed by reaction with ethylenediamine. The influence of initial concentration, temperature, carbon dose on the adsorption capacity, characteristic and thermodynamics of Pb (II) on the modified mesoporous carbon was investigated. The results showed that nitrogen-containing groups such as amido and imido group were successfully grafted on the surface of mesoporous carbon. The introduction of nitrogen-containing polyamine groups greatly enhanced the separation of Pb (II) from aqueous solution. The Langmuir Pb (II) adsorption capacity on the polyamine-modified carbon reached nearly 180mg/g, which was 1.5times of that on the untreated mesoporous carbon. The removal rate of Pb (II) from aqueous solution was significantly improved on the polyamine-modified carbon. Almost 100%of Pb (II) was adsorbed on the modified carbon with Pb (II) initial concentration less than 60mg/L. The adsorption amount of Pb (II) was increased with increasing temperature. The adsorption behavior and thermodynamic data suggested that the polyamine-modified material had a heterogeneous surface energy distribution, the adsorption was a spontaneous endothermic process, and chemical reaction could be involved and play an important role.