期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 641, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.128595
关键词
Aerogel; Graphene oxide; Dye removal; pH-responsive; Synergistic adsorption; Selective adsorption
资金
- Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science [20180510004]
- National Natural Science Foundation of China [51479016, 51908409]
- Fundamental Research Funds for the Central Universities [3132021156]
A series of composite aerogels were prepared from graphene oxide and chitosan with different precursor mass ratios, and their adsorption properties for methyl orange and methylene blue were investigated. The aerogel prepared at GO:CS = 1:2 (w/w) showed optimal compromise between adsorption and mechanical properties. The pH-responsive feature of the aerogel for single dye adsorption was observed, with selective adsorption at low pH and synergistic adsorption at high initial concentration in the binary system.
A series of composite aerogels with different precursor mass ratios were prepared from graphene oxide (GO) and chitosan (CS) by conducting the crosslinking step after lyophilization, the method of which was recently found beneficial to enhance the adsorptive properties of aerogels. The composite aerogels were then employed for the adsorption of methyl orange (MO) and methylene blue (MB) from water, and the one prepared at GO:CS= 1:2 (w/w) was selected as the optimal compromising the adsorption and mechanical properties. The maximum adsorption amounts of MO and MB were calculated to be 543.4 and 110.9 mg/g at 25 C. Especially, the effects of pH on adsorption of MO and MB in both single and binary systems were investigated in detail. The aerogel possessed pH-responsive feature for single dye adsorption, tending to adsorb MO at low pH while to adsorb MB at high pH. In the binary system, the pH-responsive feature remained and selective adsorption was observed at low initial dye concentration. In contrast, synergistic adsorption occurred instead at high initial concentration, and MB and MO could be efficiently removed simultaneously in the whole pH range of 3-11.
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