摘要
以微晶纤维素(microcrystalline cellulose,MCC)为原料,通过硫酸水解先制得纤维素纳米晶体(nanocrystalline cellulose,CNC),再把CNC和生物质石墨烯(Gr)按一定配比进行超声分散,依次经悬浮滴定、叔丁醇溶液置换法、冷冻干燥技术得到纳米纤维素/石墨烯复合气凝胶(CGA),以研究CGA对水中亚甲基蓝(MB)的去除率以及CGA剂量、吸附时间、反应温度、pH值对其的影响。研究发现,CGA对MB具有较高的去除率。在吸附反应过程中,吸附剂CGA投加量的最佳浓度为2 g/L,在前10 min内反应速率很快,并约在120 min内达到吸附平衡。去除率的大小随反应温度升高而增大,为吸热反应,pH值越大去除效果越好,吸附动力学符合伪二级动力学模型,通过Langmuir等温吸附方程得到CGA去除率最高达98%,最大吸附量为125 mg/g。
Cellulose nanocrystalline(CNC)was prepared from microcrystalline cellulose(MCC)by sulfuric acid hydrolysis,and then CNC and biomass graphene(Gr)were dispersed by ultrasonic at a certain ratio,and then were titrated by suspension titration,followed by suspension titration,tert-butanol solution replacement and freeze-drying,and Nano-cellulose graphene aerogel(CGA)was prepared. The effects of dosage,reaction time,temperature and pH on MB removal were discussed. The result showed that(CGA)had a high removal rate of MB. The optimum concentration of adsorbent was 2 g·L-1,the reaction rate was very fast in the first 10 min,and the reaction rate was about 120 min. The removal rate increased with the increase of temperature. The larger the pH,the better the removal efficiency. The adsorption kinetics accorded with the pseudo-second-order kinetic model. The removal rate of(CGA)from nano-cellulose graphene composite aerogels was obtained by Langmuir isothermal adsorption equation. The highest removal rate of(CGA)was 98%,and the adsorption capacity was 125 mg·g-1,which was endothermic reaction.
作者
胥莉
吴燕
唐沁雯
詹先旭
孙萌
秦婧荣
许萱
XU Li;WU Yan;TANG Qinwen;ZHAN Xianxu;SUN Meng;QIN Jingrong;XU Xuan(College of Furnishings and Industrial Design,Nanjing Forestry University,Nanjing 210037,China;Dehua TB New Decoration Material Co.,Ltd.,Deqing 313200,Zhejiang,China)
出处
《家具》
2019年第3期12-17,共6页
Furniture
基金
浙江省重点研发计划项目(2017C01117)
浙江省湖州市“南太湖精英计划”项目(〔2018〕2号)
关键词
纳米纤维素
石墨烯
气凝胶
吸附
亚甲基蓝
Cellulose nanocrystalline(CNC)
graphene
aerogel
adsorption
methylene blue
