CAJ | 학술논문

采用共沉淀法,以Al2(SO4)3?18H2O和AlCl3?6H2O为铝源,分别制备了2种用于除氟的羟基氧化铝吸附剂。通过吸附试验,从吸附速率、 pH值影响、吸附等温线3方面评价吸附剂的吸附性能。借助红外光谱(FTIR)和能谱(EDX)2种手段,对吸附剂进行表征,进而探讨吸附机理。结果表明,以Al2(SO4)3?18H2O为铝源制备的吸附剂,在投加量为0.4 g/L, F-的质量浓度为8 mg/L,温度为25℃,溶液pH值为7时,吸附量为37 mg/g,具有良好的除氟效果,其吸附规律符合Langmuir等温方程,动力学符合准二级动力学方程,最大吸附量为138.60 mg/g,明显高于以AlCl3?6H2O为铝源所制备的吸附剂的最大吸附量96.62 mg/g。 Al2(SO4)3?18H2O制备的吸附剂中包含的SO42-能够与F-发生置换,且SO42-的存在稳定了反应过程中溶液pH值的变化,有利于氟的吸附。因此使用经济性更好的Al2(SO4)3?18H2O制备吸附剂,比AlCl3?6H2O所制备的吸附剂具有更好的应用前景。
채용공침정법,이Al2(SO4)3?18H2O화AlCl3?6H2O위려원,분별제비료2충용우제불적간기양화려흡부제。통과흡부시험,종흡부속솔、 pH치영향、흡부등온선3방면평개흡부제적흡부성능。차조홍외광보(FTIR)화능보(EDX)2충수단,대흡부제진행표정,진이탐토흡부궤리。결과표명,이Al2(SO4)3?18H2O위려원제비적흡부제,재투가량위0.4 g/L, F-적질량농도위8 mg/L,온도위25℃,용액pH치위7시,흡부량위37 mg/g,구유량호적제불효과,기흡부규률부합Langmuir등온방정,동역학부합준이급동역학방정,최대흡부량위138.60 mg/g,명현고우이AlCl3?6H2O위려원소제비적흡부제적최대흡부량96.62 mg/g。 Al2(SO4)3?18H2O제비적흡부제중포함적SO42-능구여F-발생치환,차SO42-적존재은정료반응과정중용액pH치적변화,유리우불적흡부。인차사용경제성경호적Al2(SO4)3?18H2O제비흡부제,비AlCl3?6H2O소제비적흡부제구유경호적응용전경。
With Al2 (SO4)3?18H2O and AlCl3?6H2O as aluminum sources, two kinds of AlOOH were pre-pared by co-precipitation method and were used as adsorbents to remove F-. According to the test results, the adsorption performance of the said two adsorbents on F-were evaluated from aspects of adsorption rate, pH value influence and adsorption isotherm. The adsorbents were characterized by FTIR and EDX, and then, the adsorp-tion mechanism was discussed. The results showed that, under the condition that the adsorbent dosage was 0.4 g/L, the mass concentration of F-was 8 mg/L, the temperature was 25℃, the solution pH value was 7, the adsor-bent prepared with Al2(SO4)3?18H2O as the aluminum source had a good defluorination effect with adsorbing ca-pacity of 37 mg/g. Besides, its adsorption pattern fit Langmuir isotherm equation, and the adsorption kinetics fit pseudo-second order kinetic equation, the maximal adsorbing capacity was 138.60 mg/g, which was obviously su-perior to that of the adsorbent prepared with AlCl3?6H2O(96.62 mg/g). The SO42-in the adsorbent prepared with Al2(SO4)3?18H2O could be replaced by F-, and it stabilized the pH value of the solution during the reaction pro-cess, which was also beneficial to fluoride adsorption. Therefore, Compared to adsorbent prepared by AlCl3?6H2O, using adsorbent prepared by Al2 (SO4)3?18H2O to remove fluoride was more economical, and its application prospect was also better.