| HDTMA改性沸石的制备及吸附废水中对硝基苯酚的性能和动力学 |
| 摘要点击 2235 全文点击 1144 投稿时间：2015-09-08 修订日期：2015-12-12 |
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| 中文关键词 对硝基苯酚 十六烷基三甲基溴化铵 改性沸石 吸附动力学 吸附等温线 |
| 英文关键词 nitro-phenol HDTMA modified zeolite adsorption kinetics adsorption isotherm |
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| 中文摘要 |
| 采用十六烷基三甲基溴化铵(HDTMA)对天然沸石进行改性,研究了沸石的改性条件、改性沸石投加量、废水pH值、反应时间等对HDTMA改性沸石去除废水中对硝基苯酚性能的影响,并分析了吸附动力学和吸附等温线.结果表明,改性沸石对废水中对硝基苯酚的吸附效果明显高于天然沸石,当制备改性沸石的HDTMA溶液的质量分数为1.2%,且其pH值为10时,改性沸石对废水中对硝基苯酚的吸附量达到2.53 mg·g-1,远高于天然沸石的0.54 mg·g-1.吸附实验中,改性沸石投加量8 g·L-1,反应时间90 min,pH=6的条件下,HDTMA改性沸石对废水中对硝基苯酚的去除率高达93.9%.吸附动力学和等温线研究表明,一级动力学方程能够更好地拟合沸石吸附对硝基苯酚的过程(R2>0.90),不同温度条件下Langmuir等温线拟合方程的相关系数均在0.90以上,数据和方程拟合性较好. |
| 英文摘要 |
| In this study, natural zeolite was modified by HDTMA. Effects of the modified conditions, HDTMA-modified zeolite doses, solution pH values, and reaction time on nitro-phenol removal were investigated, and the adsorption kinetics and isotherms were discussed. Compared with natural zeolite, HDTMA-modified zeolite showed better performance in nitro-phenol removal. An adsorption capacity of 2.53 mg·g-1 was achieved when the concentration of HDTMA solution (pH=10) was 1.2% in preparation of modified zeolite. This adsorption capacity was higher than that obtained by natural zeolite (0.54 mg·g-1). In adsorption tests, when HDTMA-modified zeolite dose was adjusted to 8 g·L-1, the removal efficiency of nitro-phenol reached 93.9% after 90 min reaction, with wastewater pH of 6. Furthermore, the nitro-phenol adsorption process could be well fitted to the pseudo-first-order kinetics model (R2>0.90), whereas the adsorption isotherm results indicated that Langmuir model provided the best fitting for the equilibrium data at different temperatures, with R2 of higher than 0.90. |
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