氧化铝对硅酸的吸附去除机理
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摘要
探讨了氧化铝对水体中硅酸的吸附去除潜力、影响因素及机理。结果表明,pH 4～8时吸附量随pH、吸附剂投加量的增大而增加,说明氧化铝具有吸附去除硅酸的能力。吸附过程符合Langmuir吸附等温模式,最大吸附量达39.82 mg/g。结合~(27)Al MAS NMR与SEM-EDX分析,氧化铝吸附硅酸的机理是通过硅酸分子与氧化铝中4配位的铝发生化学反应,硅原子取代原来Al—O—Al键上的铝原子形成Al—O—Si键而被固定在氧化铝表面。
The adsorptive removal potential,influencing factors and adsorption mechanism of alumina on silicic acid in water were discussed. The results showed that the adsorption amount of silicic acid increased with the increase of pH( in the range of pH 4-8) and dosage of adsorbent,which showed that alumina had the potential ability to remove silicic acid. The adsorption process was well consistent with the Langmuir isotherm model with a maximum adsorption capacity of 39.82 mg/g. According to the results of ~(27)Al MAS NMR and SEM-EDX analysis,the adsorption mechanism of alumina on silicic acid was that the silicic acid molecular reacted with tetra-coordinated aluminum to form Al—O—Si bond by substitution reaction of the aluminum atom by silicon atom on the original Al —O—Al bond and fixed on the surface of the alumina.
The adsorptive removal potential,influencing factors and adsorption mechanism of alumina on silicic acid in water were discussed. The results showed that the adsorption amount of silicic acid increased with the increase of pH( in the range of pH 4-8) and dosage of adsorbent,which showed that alumina had the potential ability to remove silicic acid. The adsorption process was well consistent with the Langmuir isotherm model with a maximum adsorption capacity of 39.82 mg/g. According to the results of ~(27)Al MAS NMR and SEM-EDX analysis,the adsorption mechanism of alumina on silicic acid was that the silicic acid molecular reacted with tetra-coordinated aluminum to form Al—O—Si bond by substitution reaction of the aluminum atom by silicon atom on the original Al —O—Al bond and fixed on the surface of the alumina.
引文
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[2]支苏丽.工业用水中电化学深度除硅的特性研究[D].天津:天津大学,2014.
[3]Lee B E,Fletcher C A J,Shin S H,et al.Computational study of fouling deposit due to surface-coated particles in coal-fired power utility boilers[J].Fuel,2002,81(15):2001-2008.
[4]Pan Yadi,Si Fengqi,Xu Zhigao,et al.An integrated theoretical fouling model for convective heating surfaces in coal-fired boilers[J].Powder Technology,2011,210(2):150-156.
[5]李广兵,方健,徐敬,等.水垢成垢诱导期机理研究[J].同济大学学报:自然科学版,2000,28(5):555-559.
[6]Frayne C.Cooling water treatment:principles and practice[M].New York:Chemical Publishing Company,1999.
[7]Ning R Y.Discussion of silica speciation,fouling,control and maximum reduction[J].Desalination,2003,151(1):67-73.
[8]叶德霖.硅垢及其阻垢剂[J].工业水处理,1994,14(4):3-6.
[9]周本省.循环冷却水系统中的水垢及其控制[J].腐蚀与防护,2006,27(1):26-31.
[10]杜聪,阿柔娜,包仓,等.硅酸水垢及防治方法研究进展[J].工业水处理,2017,37(10):6-10.
[11]金若菲,王栋,周集体,等.混凝法处理含硅酸盐废水的实验研究[J].工业水处理,2003,23(1):42-44.
[12]Swedlund P J,Webster J G.Adsorption and polymerisation of silicic acid on ferrihydrite,and its effect on arsenic adsorption[J].Water Research,1999,33(16):3413-3422.
[13]Latour I,Miranda R,Blanco A.Silica removal with sparingly soluble magnesium compounds.PartⅡ[J].Separation and Purification Technology,2015,149:331-338.
[14]Hiemstra T,Barnett M O,Riemsdijk W H V.Interaction of silicic acid with goethite[J].Journal of Colloid and Interface Science,2007,310(1):8-17.
[15]Bouguerra W,Ali M B S,Hamrouni B,et al.Equilibrium and kinetic studies of adsorption of silica onto activated alumina[J].Desalination,2007,206(1/2/3):141-146.
[16]Yokoyama T,Takahashi Y,Tarutani T.Retarding and accelerating effects of aluminum on the growth of polysilicic acid particles[J].Journal of Colloid and Interface Science,1991,141(2):559-563.
[17]Sanciolo P,Milne N,Taylor K,et al.Silica scale mitigation for high recovery reverse osmosis of groundwater for a mining process[J].Desalination,2014,340:49-58.
[18]Iler R K.The Chemistry of Silica:Solubility,Polymerization,Colloid and Surface Properties and Biochemistry[M].New York:WileyInterscience Publication,1979:13.
[19]Bouguerra W,Ali M B S,Hamrouni B,et al.Equilibrium and kinetic studies of adsorption of silica onto activated alumina[J].Desalination,2007,206(1/2/3):141-146.
[20]Mahramanlioglu M,Kizilcikli I,Bicer I O.Adsorption of Fluoride from Aqueous Solution by Acid Treated Spent Bleaching Earth[J].Journal of Fluorine Chemistry,2002,115(1):41-47.
[21]刘亚静.硅/铝溶液溶解沉降的研究[D].沈阳:沈阳理工大学,2012.
[22]Foo K Y,Hameed B H.Insights into the modeling of adsorption isotherm systems[J].Chemical Engineering Journal,2010,156(1):2-10.
[23]张玲玲.选择性吸附去除硅酸的研究[D].呼和浩特:内蒙古大学,2017.
[24]Ding Wei,Bai Shuqin,Mu Haorong,et al.Investigation of phosphate removal from aqueous solution by two coal gangues[J].Water Science&Technology,2017,76(3/4):785-792.
[25]王乐乐.磁性氧化石墨烯及其复合纳米材料对铀(Ⅵ)的吸附性能研究[D].南昌:东华理工大学,2017.
[26]Bremere I,Kennedy M,Mhyio S,et al.Prevention of silica scale in membrane systems:removal of monomer and polymer silica[J].2000,132(1/2/3):89-100.
[27]Badruk M,Matsunaga I.Experimental results of silica removal from simulated solutions of geothermal brine of Kizildere field,Turkey[J].Geothermics,2001,30(5):561-570.
[28]Yokoyama T,Ueda A,Kato K,et al.A Study of the Alumina-Silica Gel Adsorbent for the Removal of Silicic Acid from Geothermal Water:Increase in Adsorption Capacity of the Adsorbent due to Formation of Amorphous Aluminosilicate by Adsorption of Silicic Acid[J].Journal of Colloid and Interface Science,2002,252(1):1-5.
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