Influence of reaction media on synthesis of dialdehyde cellulose/GO composites and their adsorption performances on heavy metals. (15th March 2020)

• Record Type: Journal Article
• Authors: Wang, Zhen; Yao, Mingjun; Wang, Xinrui; Li, Shuping; Liu, Yu; Yang, Guihua
• Is Part Of: Carbohydrate polymers. Volume 232(2020)
• Publication Date: 2020-03-15
• Subjects: Dialdehyde cellulose -- Graphene oxide -- Heavy metal -- N, N´-Dimethylformamide -- NaOH/urea system; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2019.115781
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: TETA cross-linked with DAC, GO in various reaction media system to synthesis novel adsorbents. Morphology, crystallinity index, carboxyl group density was quite different for both samples. The sample achieved in homogeneous system showed higher heavy metal adsorption capability. Synthesis mechanism was proposed to describe the difference between the two samples. Abstract: Graphene oxide (GO) and dialdehyde cellulose (DAC) cross-linked with triethylenetetramine (TETA) to synthesis novel adsorbents in both heterogeneous and homogeneous system (nominated as GTD-1 and GTD-2, respectively). SEM images of GTD-1 exhibited uniform distributed multilayer structure, meanwhile, GTD-2 displayed sponge-like configuration. Compared with GTD-1, GTD-2 possessed higher carboxyl groups density, higher surface area and lower crystallinity index. The adsorption property of both adsorbents was explored, GTD-1 showed an adsorptioncapacities of 65.1 mg/g and 80.9 mg/g for Cu(II) and Pb(II); meanwhile, they were 74.2 mg/g and 91.7 mg/g for GTD-2. Adsorption kinetic and equilibrium data revealed both adsorbents fit pseudo-second-order and Freundlich isotherm model for both Cu(II) and Pb(II) adsorption process. On the other hand, GTD-2 displayed lower reusability compared with GTD-1, this mainly attributed to its lower crystallinity index and the micro-pore morphology was easy to be destroyed during the adsorption process. The possible synthesis mechanism of GTD-2 was also proposed.