研究了柠檬酸钠改性沸石后其吸附水中低浓度氨氮、硝态氮、COD 等污染物的效果和吸附热力学、动力学特征，并通过比表面积与孔径分布测试、扫描电镜、X射线衍射手段测试分析了柠檬酸钠改性对沸石结构特征的影响结果。结果发现，天然沸石经柠檬酸钠改性后，其同步吸附3种污染物的效果有较大提高，其中对氨氮的去除率由53％上升到92％。对硝态氮的去除率由2％提升到10％、对COD的去除率由5％提高到35％。柠檬酸钠改性沸石后其对氨氮及COD的吸附符合Langmuir等温线，属于单层覆盖，而对硝态氮的吸附更符合Freundlich等温线。叶洛维奇吸附动力学方程在描述沸石吸附氨氮、硝态氮和 COD的吸附动力学上，更具有优越性，说明沸石对3种污染物的吸附均属于化学吸附。测试分析发现，柠檬酸钠改性沸石后其组分中钠元素含量增加，表面变得比较光滑、孔径和孔体积增大，但柠檬酸钠改性并没有改变沸石的晶体结构，主要是因为引入了钠离子以及柠檬酸根的酸性作用，提高了沸石的吸附能力。
The removal efficiency to ammonia nitrogen,nitrate nitrogen,COD and characteristics of adsorption thermodynamics,kinetics of zeolite modified by sodium citrate was investigated.And using specific surface area and pore analysis,SEM-EDS,XRD and other means to characterize the structure.Results showed that,the synchronous removal efficiency of zeolite modified by sodium citrate to ammonia nitrogen,nitrate nitrogen, COD were 92%,10%,35%,which had respectively increased by 53%,2%,5% as that of the natural zeolite.The adsorption equilibrium data of ammonia nitrogen and COD on sodium citrate modified zeolite fitted well to the Langmuir,nitrate nitrogen fitted well to the Freundlich isotherm models.The adsorption kinetics data of am-monia nitrogen,nitrate nitrogen,COD on modified zeolite could be well described by elovich absorption kinetic equation .The result of EDS demonstrated that sodium can be loaded on the zeolite,and the average pore width, total pore volume increased after modified sodium citrate.But the crystal structure kept invariant.
参考文献
| [1] | 汤泉,陈南春.天然沸石改性方法的研究进展[J].材料导报,2009(z2):439-441. |
| [2] | 江乐勇,林海,宋乾武,赵志英,董颖博.复合沸石脱氮除磷性能研究[J].工业安全与环保,2011(02):7-9. |
| [3] | XIE Qiang,XIE Jie,CHI LiNa,LI ChunJie,WU DeYi,ZHANG ZhenJia,KONG HaiNan.A new sorbent that simultaneously sequesters multiple classes of pollutants from water: Surfactant modified zeolite[J].中国科学:技术科学（英文版）,2013(07):1749-1757. |
| [4] | 张瑛洁,陈雷,马军,张亮,姚军,吴培瑛.微波强化NaCl改性沸石的除氨氮效果研究[J].中国给水排水,2009(01):72-74. |
| [5] | 商平,刘涛利,孔祥军.微波改性沸石后处理垃圾渗滤液中氨氮的实验研究[J].非金属矿,2010(02):63-65,69. |
| [6] | 黎园,赵纯,邓慧萍.2种孔径沸石分子筛对水中土霉素的去除研究[J].环境科学,2010(04):990-995. |
| [7] | 李佳,林建伟,詹艳慧.镧改性沸石活性覆盖控制重污染河道底泥溶解性磷酸盐和铵释放研究[J].环境科学,2013(11):4266-4274. |
| [8] | 夏丽华,董秉直,高乃云,常春.改性沸石去除氨氮和有机物的研究[J].同济大学学报（自然科学版）,2005(01):78-82. |
| [9] | Jinlu Wu;Y.S. Yang;Jinhua Lin .Advanced tertiary treatment of municipal wastewater using raw and modified diatomite[J].Journal of hazardous materials,2005(1/3):196-203. |
| [10] | 王萌,房春生,颜昌宙,魏群山,王灶生.沸石的改性及其对氨氮吸附特征[J].环境科学研究,2012(09):1024-1029. |
| [11] | Nurul Widiastuti;Hongwei Wu;Ha Ming Ang .Removal of ammonium from greywater using natural zeolite[J].Desalination: The International Journal on the Science and Technology of Desalting and Water Purification,2011(1/3):15-23. |
| [12] | Shaobin Wang;Yuelian Peng .Natural zeolites as effective adsorbents in water and wastewater treatment[J].Chemical engineering journal,2010(1):11-24. |
| [13] | Erik Nordell;Anna B. Hansson;Martin Karlsson .Zeolites relieves inhibitory stress from high concentrations of long chain fatty acids[J].Waste Management,2013(12):2659-2663. |
| [14] | 张曦,吴为中,温东辉,李文奇,唐孝炎.氨氮在天然沸石上的吸附及解吸[J].环境化学,2003(02):166-171. |
| [15] | 钱吉彬,杨朗,张华,刘柳.镇江斜发沸石对氨氮的吸附动力学及热力学研究[J].环境工程学报,2011(02):327-330. |
| [16] | 王阔,陈永昌,陈晓陆,孙兆林,李秀奇,宋丽娟.基于XRD曲线分形维度的丝光沸石晶化动力学行为分析[J].应用化学,2008(09):1078-1081. |
| [17] | 李天昕,杨雯雯,朱维耀.红外光谱法与X射线衍射法分析介孔复合材料组分变化机理[J].北京科技大学学报,2009(06):739-743. |
| [18] | Hanxin Huo;Hai Lin;Yingbo Dong;Huang Cheng;Han Wang;Lixia Cao .Ammonia-nitrogen and phosphates sorption from simulated reclaimed waters by modified clinoptilolite[J].Journal of hazardous materials,2012(Aug.30):292-297. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%