Abstract
Hydrogels were prepared from tea cellulose with the addition of single-walled carbon nanotube oxides in 1-allyl-3-methylimidazolium chloride. Single-walled carbon nanotube oxides/tea cellulose hydrogels (TCH-SWNTs) were characterized by Fourier transform infrared, x-ray diffraction, texture profile analysis, and thermogravimetric analysis. The adsorption capacity of methylene blue using the prepared hydrogels was also investigated. The hydrogels exhibited greater thermal stability and intensive textural property with the addition of single-walled carbon nanotube oxides. Compared with undoped TCHs, the weight loss peak moved from 280 to 323°C, and the values of hardness, fracturability, gumminess, and resilience were 8.4, 5.3, 10.8, and 1.9, respectively, times higher than that of TCHs. As an absorbent of methylene blue, TCH-SWNTs accorded to a pseudo-second-order kinetic model, good adsorption capacity (13.8 mg/g), and good adsorption ratio (27.59%) and showed potential as a drug carrier.
Highlights
The production and consumption of tea is estimated to increase in the decade to satisfy the increase in demand for tea in developing countries, e.g., India and China
1 − ct co where c0 and ct are the methylene blue concentrations at the initial time and a given time, respectively, m is the weight of the prepared composite hydrogel sample, and V is the volume of the methylene blue solution
For SWNTs, the characteristic peak at 3,445 cm−1 was assigned to the stretching vibration of the O– H groups
Summary
The production and consumption of tea is estimated to increase in the decade to satisfy the increase in demand for tea in developing countries, e.g., India and China. A large amount of tea residue is produced after consumption of various kinds of tea. Single-walled carbon nanotubes are graphite–carbon isomers with more complex structures (Rebelo et al, 2016) and related properties for diverse applications. Because of high surface areas and special structures, single-walled carbon nanotubes can enhance solubilization and delivery of curcumin (Yuan et al, 2016), efficiently eliminate toxic phenol (Dehghani et al, 2016), sensitively detect aflatoxin B1 (Zhang et al, 2016), and so on. We prepared composite hydrogels with singlewalled carbon nanotube oxides (SWNTs) and tea residue cellulose mixed in 1-allyl-3-methylimidazolium chloride. The single-walled carbon nanotube oxides/tea cellulose hydrogels (TCH-SWNTs) were characterized by Fourier transform infrared (FTIR), x-ray diffraction (XRD), texture profile analysis (TPA), and thermogravimetric analysis (TGA). Methylene blue was used as a drug molecule model to investigate the adsorption properties, e.g., capacity, ratio, and kinetics, of TCH-SWNTs
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