酸/碱改性粉煤灰的组成变化对吸附苯酚的性能影响  

Effect of Composition Change of Acid/Alkali Modified Fly Ash on Adsorption Performance of Phenol

作　　者：陈伟[1] 王雷[2] 赵红丽[1] 王丽红[1] 闫彩颖 Chen Wei;Wang Lei;Zhao Hongli;Wang Lihong;Yan Caiying(Department of Chemistry,Tangshan Normal University,Hebei Key Laboratory of Degradable Polymers,Tangshan Key Laboratory of Green Specialty Chemicals,Tangshan 063000,China;College of Carbon Neutrality Future Technology,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]唐山师范学院化学系,河北省可降解聚合物重点实验室,唐山市绿色专用化学品重点实验室,河北唐山063000 [2]北京工业大学碳中和未来技术学院,北京100124

出　　处：《南开大学学报(自然科学版)》2025年第1期112-120,共9页Journal of Nankai University(Natural Sience)

基　　金：河北省高等学校科学技术研究项目(ZC2024021);唐山师范学院基金项目(2022C41)。

摘　　要：以工业废物粉煤灰(FA)为原料,分别采用氢氧化钙、氢氧化钠为碱改性剂,盐酸、硫酸为酸改性剂,制备改性粉煤灰;用滴定法分析粉煤灰中SiO_(2)、Al_(2)O_(3)、CaO和MgO等组分的含量,用比色法分析Fe2O_(3)和TiO_(2)等组分的含量;探究改性前后粉煤灰组成变化,并考察粉煤灰改性前后对不同浓度的苯酚的吸附效果.结果表明:碱改性粉煤灰时,氢氧化钠改性优于氢氧化钙,J-FA2-3(m_(氢氧化钠)∶m_(粉煤灰)=3∶9)对苯酚的去除率最高,约为54.02%-84.26%,与未改性粉煤灰对比,去除率提升了2.62-6.44倍;酸改性粉煤灰时,硫酸改性优于盐酸,S-FA2-1(1 mol/L硫酸)对苯酚的吸附效果较好,去除率达67%-100%,与未改性粉煤灰相比,去除率提高了3.30-8.23倍;酸、碱改性效果对比,酸改性粉煤灰对苯酚的去除率优于碱改性粉煤灰,S-FA2-1比J-FA2-3的去除率增加了9%-16%.对热力学数据进行分析,未改性粉煤灰、J-FA2-3、S-FA2-1均符合弗兰德里希(Freundlich)等温吸附模型,对苯酚的吸附过程属于多层吸附;且S-FA2-1的吸附能力强于J-FA2-3、强于未改性粉煤灰,与上述结论一致.Using the industrial waste fly ash as raw material,modified fly ash was prepared by using calcium hydroxide and sodium hydroxide as base modifier,hydrochloric acid and sulfuric acid as acid modifier.The contents of SiO_(2),Al_(2)O_(3),CaO and MgO in fly ash were analyzed by titration method,and the contents of Fe_(2)O_(3) and TiO_(2) in fly ash were analyzed by colorimetric method.The changes of fly ash composition were explored,and the adsorption effects of modified fly ash on phenol of different concentrations were investigated.The results showed that when alkali is used as the modifier of fly ash,sodium hydroxide is superior to calcium hydroxide,and J-FA2-3(m_(NaOH)∶m_(FA)=3∶9)has the highest removal rate of phenol,which is about 54.02%-84.26%,which is 2.62-6.44 times higher than that of unmodified fly ash.When acid is used as the modifier of fly ash,sulfuric acid is superior to hydrochloric acid,and S-FA2-1(1 mol/L sulfuric acid)has a better adsorption effect on phenol,with a removal rate of 67%-100%,which is 3.30-8.23 times higher than that of unmodified fly ash.Comparing the effect of acid and alkali modification,the removal rate of phenol from acid-modified fly ash is better than that from alkali-modified fly ash,and the removal rate of S-FA2-1 is 9%-16% higher than that of J-FA2-3.According to the analysis of thermodynamic data,unmodified fly ash,J-FA2-3 and S-FA2-1 all conform to the Freundlich isothermal adsorption model,and the adsorption process of fly ash for phenol is multilayer adsorption.The adsorption capacity of S-FA2-1 is stronger than J-FA2-3 and unmodified fly ash,which is consistent with the above conclusions.

关 键 词：粉煤灰 改性 吸附 苯酚 热力学 

分 类 号：TQ424.1[化学工程]