Promoting dynamic adsorption of Pb2+ in a single pass flow using fibrous nano-TiO2/cellulose membranes

被引:40
作者
Li, Yanxiang [1 ]
Li, Lei [1 ,2 ]
Cao, Lixia [1 ]
Yang, Chuanfang [1 ]
机构
[1] Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Key Lab Biochem Engn, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100190, Peoples R China
关键词
Nano-TiO2/cellulose membrane; Lead; Dynamic adsorption; Breakthrough; HEAVY-METAL REMOVAL; TITANIUM-DIOXIDE; OXIDE NANOMATERIALS; ARSENIC REMOVAL; WATER-TREATMENT; MODELS; BATCH; TIO2; BIOSORPTION; ADSORBENTS;
D O I
10.1016/j.cej.2015.08.068
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A variety of nano-TiO2/cellulose composite fibers (TiO2/CF) were synthesized via both in situ growing rutile TiO2 nanocrystals and electrostatic self-assembly of commercial nano rutile TiO2 particles onto cellulose fibers. These fibers were then processed into fibrous membrane beds by wet-laid technique. Dynamic adsorption of lead (Pb2+) was subsequently carried out by pumping the feed solution through the bed in a single-pass flow mode. The influence of various parameters including flow rate, bed height and bed stacking pattern on bed breakthrough behavior was investigated. It was found that the in situ-TiO2/CF bed outperformed others; its loading capacity of Pb2+ was 13 times that of pure CF bed, and 9 times that of the self-assembled TiO2/cellulose bed prior to 10% breakthrough. The dynamic adsorption behavior of the in situ-TiO2/CF bed was better predicted by Dose Response model among other models tested. The bed was also selective for Pb2+ over Ca2+, and was readily regenerable when eluted with 0.1 M HCl solution for repeated use. The outstanding performance of the in situ-TiO2/CF bed was a result of larger fiber adsorption capacity and faster adsorption kinetics compared with the other beds having similar geometric bed structure. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:1145 / 1153
页数:9
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