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羟基磷灰石除氟滤料的吸附平衡及动力学

Keywords: 除氟,羟基磷灰石,吸附热力学,吸附动力学

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Abstract:

羟基磷灰石（HAP）是一种高容量、环保型饮用水除氟材料。以氢氧化钙和磷酸为原料采用沉淀法合成了羟基磷灰石，并用红外光谱和XRD图谱进行了表征。研究了接触时间、pH值和温度等因素对羟基磷灰石吸附氟性能的影响。通过对吸附过程中的热力学动力学参数的计算来判断吸附的实质过程。研究结果表明，60min以内吸附速率较快，在约70min时吸附过程趋于平衡；酸性环境中的吸附效果要比在碱性环境中要好；升高温度有利于吸附的进行。吸附过程更符合Langmuir吸附模型，说明化学吸附占主导地位；吸附过程是一个自发的吸热过程，其中ΔGo<0，ΔHo为13.10kJ/mol，Ea为15.24kJ/mol，ΔSo为31.42J/（mol?K）；吸附过程符合拟二级动力学模型。

 References

[1]  Krishna B;Kaushik G;Uday C. G,Adsorption of fluor- ide by hydrous iron(m)-tin(IV) bimetal mixed oxide from the aqueous solutions,Chemical Engineering Journal,2009(1-3).
[2]  Daifullah A. A. M;Yakout S. M;Elreefy S.A,Ad- sorption of fluoride in aqueous solutions using KMnQ-mod- ified activated carbon derived from steam pyrolysis of rice straw,Journal of Hazardous Materials,2007(1-2).
[3]  王萍;李国昌.羟基磷灰石的制备及除氟性能研究[J].环境工程学报,2009(3)
[4]  刘海波,左文武,林文周.合成羟基磷灰石除氟研究[J].南华大学学报(自然科学版),2007(4)doi:10.3969/j.issn.1673-0062.2007.04.014
[5]  查春花,张胜林,夏明芳.饮用水除氟方法及其机理[J].净水技术,2005(6)doi:10.3969/j.issn.1009-0177.2005.06.013
[6]  Khatibikamal V;Torabian A;Janpoor F,Fluor- ide removal from industrial wastewater using electrocoagula- tion and its adsorption kinetics,Journal of Hazardous Materials,2010(1-3).
[7]  Subhashini Ghorai ；K.K.Pant,Equilibrium,kinetics and breakthrough studies for adsorption of fluoride on activated alumina,Separation and Purification Technology？,2005, 42(3).
[8]  Popat K. M;Anand P. S;Dasare B. D,Selective re- moval of fluoride ions from water by the aluminum form of the aminomethylphosphonic acid-type ion exchanger,Re- act Polym,1994(1).
[9]  盂紫强;耿江;刘海龙,6种吸附材料饮用水除氟效果比较研究,中国地方病学杂志,2002(3).
[10]  王鼎.粉末状骨炭用于饮用水除氟的实验研究[J].水资源保护,2008(1)doi:10.3969/j.issn.1004-6933.2008.01.017
[11]  谢虹;贾文波.活性氧化铝除氟剂的除氟性能研究[J].华中科技大学学报(医学版),2005(5)doi:10.3870/j.issn.1672-0741.2005.05.041
[12]  R. Leyva-Ramos ；J. Rivera-Utrilla ；N.A. Medellin-Castillo,Kinetic modeling of fluoride adsorption from aqueous solution onto bone char,Chemical engineering journal？,2010, 158(3).
[13]  李新云,郑大威,应波.羟基磷灰石降氟剂合成方法降氟机理研究进展[J].卫生研究,2002(2)doi:10.3969/j.issn.1000-8020.2002.02.026
[14]  Sairam S. C;Natrayasamy V;Meenakshi S,Fluoride sorption by nano-hydroxyapatite/chitin composite,J Haz- ard Mater,2009(1).
[15]  Chen B. H;ChenK. I;HoM. L,Synthesis of calcium phosphates and porous hydroxyapatite beads pre- pared by emulsion method,Materials Chemistry and Phys- ics,2009(1).
[16]  Eric M. Rivera ；Miguel Araiza ；Witold Brostow,Synthesis of hydroxyapatite from eggshells,Materials Letters？,1999, 41(3).
[17]  Sairam S. C;Natrayasamy V;Meenakshi S,Defluori- dation chemistry of synthetic hydroxyapatite at nano scale:Equilibrium and kinetic studies,Journalof Hazardous Ma- terials,2008(1-2).
[18]  张洪滨;冯莉;戚冬伟.羟基磷灰石除氟性能研究[J].中国农村水利水电,2011(3)
[19]  G. Alagumuthu ；M. Rajan,Equilibrium and kinetics of adsorption of fluoride onto zirconium impregnated cashew nut shell carbon,Chemical engineering journal？,2010, 158(3).
[20]  Viswanathan, N ；Meenakshi, S,Enhanced fluoride sorption using La(III) incorporated carboxylated chitosan beads,Journal of Colloid and Interface Science？,2008, 322(2).
[21]  Khan A;Singh R,Adsorption thermodynamics of carbofu- ran on Sn (IV) arsenosilicate in H+, Na and Ca2+ forms,Colloids and Surfaces,1987(1).
[22]  Shan Gao ；Rong Sun ；Zhenggui Wei,Size-dependent defluoridation properties of synthetic hydroxyapatite,Journal of Fluorine Chemistry？,2009, 130(6).
[23]  Shan Gao ；Rong Sun ；Zhenggui Wei,Size-dependent defluoridation properties of synthetic hydroxyapatite,Journal of Fluorine Chemistry？,2009, 130(6).
[24]  雒和敏,曹国璞.活性炭对含铅废水吸附特性研究[J].环境工程学报,2010(2)
[25]  张金梅,羟基磷灰石去除饮用水中氟的实验研究,昆明:昆明理工大学,2008.

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