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Thermokinetics simulation for multi-walled carbon nanotubes with sodium alginate by advanced kinetics and technology solutions |
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| Authors: | Sheng-Yi Weng Shang-Hao Liu Lung-Chang Tsai Tung-Feng Hsieh Chih-Ming Ma Chi-Min Shu |
| Affiliation: | 1. Process Safety and Disaster Prevention Laboratory, Department of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology (NYUST), 123, University Rd, Sec. 3, Douliou, Yunlin, 64002, Taiwan, ROC 2. Doctoral Program, Department of Safety, Health, and Environmental Engineering, NYUST, Douliou, Yunlin, 64002, Taiwan, ROC 3. Department of Safety Engineering, Changzhou University, Changzhou, Jiangsu, China 4. Department of General Education Center, Chienkuo Technology University, 1, Chiehshou North Rd, Changhua, 50046, Changhua, Taiwan, ROC 5. Department of Cosmetic Application and Management, St. Mary’s Medicine Nursing, and Management College, 100, Samsung Rd., Samsung, 26644, Yilan, Taiwan, ROC |
| Abstract: | To accomplish an effective analysis of adsorption, the strong acid dye from aqueous solution of sodium alginate (SA) and multi-walled carbon nanotubes (MWCNTs) composite gel beads were used as important parameters. Differential scanning calorimetry (DSC) was used to measure the heat of breakdown reaction. The experimental conditions were set at 0.5, 1, 2, 4, and 8 °C min?1, and the temperature range was 30–300 °C. The heating rates and the temperature range were set as follows: Four kinds of proportion in this experiment contained 2 SA % w/v (SA), 0.03, 0.09, 0.18, 0.36 % w/v (MWCNTs), and 10 % w/v calcium chloride, respectively. Four samples, 5, 6, 7, 8, and 9 mg, were used to detect the experimental data. It contributed to understanding the reaction for the distinctive MWCNTs. With the thermokinetic data by isoconversional approach obtained from advanced kinetics and technology solutions (AKTS), the related thermal safety information can be obtained from the thermal reaction of MWCNTs. Valuable parameters, such as activation energy (E a) and heat of decomposition, can be applied in operation, including adsorption and desorption processes. After DSC tests, and under the four compositions of SA/MWCNTs, at different heating rates of 0.5, 1, 2, 4, and 8 °C min?1, primarily we found that when the heating rate was increased, exothermic onset temperature would increase gradually. After analyzing E a value by isoconversional kinetics, we learned that in four different adsorption compositions, SA/MWCNTs0.03 (161.20 kJ mol?1) was the minimum. Among them, the highest value was SA/MWCNTs0.18 (220.48 kJ mol?1). However, in this study, for SA/MWCNTs compositions we found that E a value will drop in the final material SA/MWCNTs0.36. Accordingly, if the ratio of SA and calcium chloride was fixed, then different compositions of the MWCNTs would affect adsorption efficiency of SA/MWCNTs and E a variation. |
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