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| Preparation and adsorption performance of peanut shells based adsorbent by potassium hydroxide-assisted hydrothermal method |
| Received:June 11, 2016 |
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| KeyWord:peanut shells, hydrothermal modification, potassium hydroxide, rhodamine B, adsorption |
| Author Name | Affiliation | E-mail | | CHEN Chun-qiang | Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao 266109, China | | | WU Juan | Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao 266109, China | | | WU Xin-hui | Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao 266109, China
College of Resources and Environmental Science, Northeast Agricultural University, Harbin 150030, China | | | MA Dong | Qingdao Engineering Research Center for Rural Environment, Qingdao Agricultural University, Qingdao 266109, China | madong8088@126.com |
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| Abstract: |
| In order to realized the resource utilization of peanut shells, a peanut shells-based adsorbent was prepared by potassium hydroxide-assisted hydrothermal method, and the adsorption performance of rhodamine B(Rh B) dye was discussed. The modified parameters, such as temperature, duration and concentration of KOH, were optimized by the orthogonal experiment. The characterization of the as-prepared adsorbent was investigated using scanning electron microscope(SEM) and Fourier transform infrared spectroscopy(FTIR). The influence of adsorbent dosage, initial concentration and pH of Rh B solutions were investigated. The best adsorption efficiency of Rh B by modified peanut shells was at the condition of the temperature of 453 K, reaction time of 10 h, and the KOH concentration of 2%. The removal efficiency of Rh B was 93.50% under condition of 5 mg·L-1, 1.5 g·L-1 and 120 min, corresponding to the initial concentration of Rh B, the dosage of modified peanut shells, and the adsorption time, respectively. Adsorption kinetics fitting results showed that the adsorption accorded with the pseudo-second-order kinetics. Langmuir monolayer adsorption model could be well used to describe the adsorption process. Meanwhile, the adsorption was a spontaneous endothermic process by the results of ΔH>0 and ΔG<0, and was mainly consisted with physical adsorption. |
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