胺化改性竹粉吸附剂的优化制备及吸附铜效果  

Preparation Optimization of Amine-Modified Bamboo Powder Adsorbent and Its Adsorption Performance for Cu

作　　者：林少华[1] 孙芹菊[2] LIN Shaohua;SUN Qinju(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;College of Ecology and Environment,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学土木工程学院,南京210037 [2]南京林业大学生态与环境学院,南京210037

出　　处：《森林工程》2025年第2期225-232,共8页Forest Engineering

基　　金：国家重点研发计划课题(2017YFC0505803)。

摘　　要：为优化制备胺化改性竹粉(AMBP),考察碱预处理浓度、环氧化时间和温度、胺化改性剂和改性温度等因素的影响,并利用扫描电镜(SEM)、傅里叶红外光谱(FTIR)和X射线光电子能谱(XPS)等对其结构进行表征。结果表明,碱预处理浓度、环氧化温度和时间、胺化温度和改性试剂种类均对吸附剂的制备存在显著影响。吸附剂最佳制备条件为,原竹粉3.0 g,经2 mol/L NaOH碱处理,于100 mL的8%NaOH和15 mL的环氧氯丙烷中,40℃下环氧化反应8 h;再在5 mL四乙烯五胺(TEPA)、1 g Na_(2)CO_(3)、100 mL水中,40℃下反应2 h。原竹粉的竹纤维结构在改性过程中得到了较好保留,胺化改性后,氮元素质量分数显著增加,引入新的—NH_(2)、—NH—等基团。吸附剂AMBP-TEPA对水中游离态和络合态Cu(Ⅱ)均具有良好吸附效果。研究结果为竹材的资源化利用提供新的途径和技术支撑。To optimize the preparation of amine-modified bamboo powder(AMBP),the effects of alkaline pretreatment concentration,epoxidation time and temperature,amination reagent and modification temperature were investigated,and the adsorbent structure was further characterized using scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),etc.The results showed that the alkaline pretreatment concentration,epoxidation temperature and time,amination temperature and modification reagents had significant effects on the adsorbent preparation.The optimal preparation conditions were as follows:3.0 g of raw bamboo powder was treated with 2 mol/L NaOH alkaline,and then the epoxidation reaction was carried out in the mixture of 100 mL of 8%NaOH and 15 mL of epichlorohydrin at 40℃for 8 hours;the final amination was conducted in the solution of 5 mL of TEPA,1 g of Na_(2)CO_(3) and 100 mL of water at 40℃for 2 hours.The bamboo fiber structure of the original bamboo powder was well preserved during the modification process.After amine-modification,the N element mass fraction significantly increased,and the new functional groups such as-NH_(2) and-NH-were introduced.The adsorbent AMBP-TEPA had a good adsorption performance on both free and complexed Cu(Ⅱ)in water.This study provides a new approach and technical support for the resource utilization of bamboo wood.

关 键 词：竹粉 胺化 优化改性 铜 吸附 

分 类 号：S785[农业科学—林学]