利用大型工业设备制备出性能稳定的粉末层状氢氧化镁铝（500kg/批,记为Mg-Al LDH）,利用沉积法将Mg-Al LDH进行改性与成型,并对其进行材料表征,探索了Mg-Al LDH的改性机理,研究了改性与成型层状氢氧化镁铝（记为MG Mg-Al CLDH）对PO43-的动态吸附脱除及再生性能。结果表明,Mg-AlLDH经改性与成型后,比表面积为233.34m2/g,比未改性时提高了40%,Mg-Al LDH的改性主要是通过氢键键合和离子交换实现的。MG Mg-Al CLDH对PO43-的穿透吸附量是13.49mg/g,是未改性时的6倍以上,再生率为126.24%,MG Mg-Al CLDH吸附脱除PO43-后能够满足污水综合排放一级标准0.5mg/L。解决了Mg-Al LDH在实际应用中存在粉末易堵塞床体、无法实现固液分离和再生的问题,同时为水体中磷的脱除提供了一条新型可行之路。
Powder layered double hydroxide of Mg-Al LDH has been prepared by hydrothermal technology with 500 kg/batch,modified and granulated(MG Mg-Al CLDH) by deposition method.After modification and granulation,the fixed bed could not be accumulated and cloged by the adsorbents.MG Mg-Al CLDH has been characterized with SEM-EDX,specific surface area and pore volume,XRD,FT-IR.The surface area of MG Mg-Al CLDH was 233.34m2/g,40% higher than G Mg-Al CLDH(granulated but without modification).The mechanism of modification was hydroxyl group and ion exchange.PO43- was removed from aqueous solution by MG Mg-Al CLDH with column experiments,the breakthrough adsorption capacity was 13.49mg/g,more than 6 times of G Mg-Al CLDH.The exhausted MG Mg-Al CLDH could be desorbed with 0.1mol/L NaOH and 3mol/L NaCl and regenerated with 25% MgCl2.The regeneration rate was 126.24%.After removal,the water quality could satisfy with 0.5mg/L,the first degree of integrated wastewater discharge.So this work is very useful for the practical application of Mg-Al LDH and the removal of phosphorus.
参考文献
| [1] | Ferreira OP;de Moraes SG;Duran N;Cornejo L;Alves OL .Evaluation of boron removal from water by hydrotalcite-like compounds[J].Chemosphere: Environmental toxicology and risk assessment,2006(1):80-88. |
| [2] | Vreysen S;Maes A .Adsorption mechanism of humic and fulvic acid onto Mg/A1 layered double hydroxides[J].Applied Clay Science,2008,38:237-249. |
| [3] | Kameda T;Saito S;Umetsu Y .Mg-A1 layered double hydroxide intercalated with ethylene-diaminetetraaeetate anion:synthesis and application to the uptake of heavy metal ions from an aqueous solution[J].Separation and Purificalion Technology,2005,47(1-2):20. |
| [4] | Xing Kun;Wang Haizeng;Guo Lugang et al.Adsorp-tion of tripolyphosphate from aqueous solution by Mg-AI-CO:layered double hydroxides[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2008,328(1-3):15-20. |
| [5] | 邢坤,王海增,李晓玉.焙烧层状氢氧化镁铝对水溶液中As（Ⅲ）和As（Ⅴ） 的吸附性能比较[J].环境科学,2009(03):748-754. |
| [6] | 邢坤,王海增.焙烧层状氢氧化镁铝对水溶液中亚硝酸盐的吸附脱除[J].环境化学,2009(03):373-378. |
| [7] | Yoshioka T;Kameda T;Miyahara M et al.Removal of tetrafluoroborate ion from aqueous solution using magne-sium-aluminum oxide produced by the thermal decompo-sition of a hydrotalcite-like compound[J].Chemosphere,2007,69:832-835. |
| [8] | Lv L;He J;Wei M et al.Factors influencing the re-moval of fluoride from aqueous solution by calcined Mg-A1-CO3 layered double hydroxides[J].Journal of Hazard-ous Materials B,2006,133:119-128. |
| [9] | WANG HAI-JUN;LIANG XIAO-MIN;JIANG PING-HONG;WANG JIAN;WU SHI-KAI;WANG HONG-ZHU .TN TP ratio and planktivorous fish do not affect nutrient-chlorophyll relationships in shallow lakes[J].Freshwater Biology,2008(5):935-944. |
| [10] | Schindler, DW;Hecky, RE;Findlay, DL;Stainton, MP;Parker, BR;Paterson, MJ;Beaty, KG;Lyng, M;Kasian, SEM .Eutrophication of lakes cannot be controlled by reducing nitrogen input: Results of a 37-year whole-ecosystem experiment[J].Proceedings of the National Academy of Sciences of the United States of America,2008(32):11254-11258. |
| [11] | 邢坤,王海增,郭鲁钢,宋卫得,赵正鹏.三聚磷酸钠在层状氢氧化镁铝及其焙烧产物上的吸附特性[J].环境化学,2007(06):792-796. |
| [12] | 邢坤,王海增.硝酸盐在层状氢氧化镁铝及其焙烧产物上的吸附特性比较[J].环境科学学报,2008(07):1340-1346. |
| [13] | 邢坤;王海增;李晓玉 等.改性成型的镁铝水滑石的制备方法及应用[P].中国专利:CNl01386424,2011. |
| [14] | 高延耀;顾国维;周琪.水污染控制工程[M].北京:高等教育出版社,2007 |
| [15] | 国家环境保护总局.水质总磷的测定钼酸铵分光光度法-水质监测分析方法标准[M].北京:中国环境科学出版社,1990:1015-1018. |
| [16] | 袁金芳,李健生,王放,顾娟,孙秀云,韩卫清,王连军.巯基功能化短孔道有序介孔材料HS-Zr-Ce-SBA-15的合成及吸附性能[J].功能材料,2011(09):1714-1718. |
| [17] | Paush I;Lohse H H;Schurmann K et al.Syntheses of disordered and A1 rich hydrotalcite-like compounds[J].Clays and Clay Minerals,1986,34:507. |
| [18] | Kloprogge J T;Frost R I.Fourier transform infrared and Raman spectroscopic study of the local structure of Mg,Ni and Co-hydrotalcites[J].Journal of Solid State Chemistry,1999:146,506-515. |
| [19] | Kloprogge J T;Wharton D;Hickey L et al.Infrared and Raman study of interlayer anions CO,NO2,SO-and C10 in Mg/Al-hydrotalcite[J].American Mineralogist,2002,87(03):623-629. |
| [20] | Yang WS.;Kim Y.;Liu PKT.;Sahimi M.;Tsotsis TT. .A study by in situ techniques of the thermal evolution of the structure of a Mg-Al-CO3 layered double hydroxide[J].Chemical Engineering Science,2002(15):2945-2953. |
| [21] | Kagunya W;Baddour-Hadjean R;Kooli F.Vibra tional modes in layered double hydroxides and their cal-cined derivatives[J].Chemical Physics,1998:236,-225-234. |
| [22] | Guo SC;Li DQ;Zhang WF;Pu M;Evans DG;Duan X .Preparation of an anionic azo pigment-pillared layered double hydroxide and the thermo- and photostability of the resulting intercalated material[J].International Journal of Quantum Chemistry,2004(12):4597-4604. |
| [23] | 吴正,卫敏,张法智,沈军,段雪.酒石酸插层水滑石层间距的可控性研究[J].北京化工大学学报(自然科学版),2004(04):74-77. |
| [24] | Miyata S .Anion-exchange properties of hydrotalcite-like compounds[J].Clays and Clay Minerals,1983,31(04):305. |
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