吸附磷饱和的铁改性纳米纤维素的再生条件与效果研究  

Study on regeneration conditions and effect of iron modified nanocellulose saturated with phosphorus adsorption

作　　者：罗莹 刘敏[1,2] 陈滢[1,2] 左艳[1] 王婷庭[1] LUO Ying;LIU Min;CHEN Ying;ZUO Yan;WANG Tingting(College of Architecture & Environment, Sichuan University, Chengdu 610065, China;Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China)

机构地区：[1]四川大学建筑与环境学院,成都610065 [2]四川大学中-德水环境与健康研究中心,成都610065

出　　处：《黑龙江大学自然科学学报》2019年第4期436-441,共6页Journal of Natural Science of Heilongjiang University

基　　金：国际科技合作与交流专项资助项目(2012DFG91520);四川省重大科技专项资助项目( 2019YFS0501)

摘　　要：将铁负载于纳米纤维素上制得铁改性纳米纤维素(Fe(OH) 3 @CNFs),并将其作为吸附剂用于去除废水中的磷。探讨了吸附磷饱和的Fe(OH) 3 @CNFs的再生性能,比较了不同类型的再生液、再生液浓度和脱附次数对Fe(OH) 3 @CNFs再生的影响,对再生前和再生五次后的Fe(OH) 3 @CNFs进行扫描电子显微镜(SEM)和傅立叶红外光谱(FT-IR)分析。结果表明,0.5 mol·L ^-1 的NaOH溶液对材料的再生效果最好。材料经吸附-脱附再生循环后,再生第五次的Fe(OH) 3 @CNFs的丝状结构表面发生了轻微的刻蚀,表面负载的铁元素含量从23.38%下降到22.98%。同时,材料再生前后的傅立叶红外光谱图中的吸收峰接近,说明功能性官能团无明显变化。再生后的 Fe(OH) 3 @CNFs 对磷的吸附容量从24.58 mg·L ^-1 下降到16.60 mg ·L^-1 ,说明再生后的材料仍能保持较好的吸附能力,且可以实现材料的多次重复利用。The iron-modified nanocellulose (Fe(OH) 3 @CNFs) was prepared by loading iron on nanocellulose, which was used as adsorbent to eliminate phosphorus from wastewater.The regeneration performance of Fe(OH) 3 @CNFs was investigated and the effects of different types of regeneration solution, concentration of regeneration solution and desorption times on the regeneration of Fe(OH) 3 @CNFs were compared. The Fe(OH) 3 @CNFs before and after regeneration for five times were analyzed by SEM and FT-TR. The results illustrated that the best performance on the regeneration of Fe(OH) 3 @CNFs could be achieved under 0.5 mol·L ^-1 NaOH solution. After adsorption-desorption regeneration cycle, the surface of the filamentous structure of Fe(OH) 3 @CNFs regenerated for the fifth time was slightly etched, the iron content of the surface load decreased from 23.38% to 22.98%. At the same time, the absorption peaks of the infrared spectra for two samples were close to each other, which indicated that there was no obvious change in functional groups. The phosphorus adsorption capacity of the regenerated Fe(OH) 3 @CNFs decreased from 24.58 mg·L^-1 to 16.60 mg·L ^-1 , showing that the regenerated material could still maintain good adsorption capacity even after 5 times regeneration, and the material can be reused for many times.

关 键 词：铁改性纳米纤维素 脱附 吸附剂再生 磷 

分 类 号：X703.1[环境科学与工程—环境工程]