CAJ | 학술논문

以杨梅单宁为模板,Al(NO3)3．9H2O为铝源制备了介孔Al2O3吸附材料,研究了介孔Al2O3对水体中氟的吸附特性。 X-射线衍射分析表明,所制备的Al2 O3的晶形为γ-Al2 O3。 N2-吸附/脱附分析表明,γ-Al2 O3存在明显的介孔结构。吸附实验发现,在酸性条件下介孔γ-Al2 O3对氟的吸附量较高；介孔γ-Al2 O3对水体中氟的吸附量随温度的升高而增大,当初始氟离子浓度为95mg·L-1、温度为303K 时的平衡吸附量达到58．28mg·g-1,而温度为323K时的平衡吸附量达到68．27mg·g-1,而且吸附等温线符合Langmuir方程。介孔γ-Al2 O3对氟的吸附在前2h吸附较快,8h基本达平衡,吸附动力学符合拟二级速度方程。介孔γ-Al2 O3吸附氟达平衡后经5mmol·L-1的NaOH溶液解吸,能将吸附的氟全部解吸,解吸后的介孔γ-Al2 O3对氟的吸附能力基本不变,表现出良好的重复使用性能。
이양매단저위모판,Al(NO3)3．9H2O위려원제비료개공Al2O3흡부재료,연구료개공Al2O3대수체중불적흡부특성。 X-사선연사분석표명,소제비적Al2 O3적정형위γ-Al2 O3。 N2-흡부/탈부분석표명,γ-Al2 O3존재명현적개공결구。흡부실험발현,재산성조건하개공γ-Al2 O3대불적흡부량교고；개공γ-Al2 O3대수체중불적흡부량수온도적승고이증대,당초시불리자농도위95mg·L-1、온도위303K 시적평형흡부량체도58．28mg·g-1,이온도위323K시적평형흡부량체도68．27mg·g-1,이차흡부등온선부합Langmuir방정。개공γ-Al2 O3대불적흡부재전2h흡부교쾌,8h기본체평형,흡부동역학부합의이급속도방정。개공γ-Al2 O3흡부불체평형후경5mmol·L-1적NaOH용액해흡,능장흡부적불전부해흡,해흡후적개공γ-Al2 O3대불적흡부능력기본불변,표현출량호적중복사용성능。
Mesoporous γ-Al2O3 adsorbent was prepared by using bayberry tannin as template and Al(NO3)3. 9H2O as aluminum source,and the adsorption behaviors of this novel adsorbent to fluoride in aqueous solution were also investigated. XRD analysis in-dicated that the crystal structure of as prepared Al2 O3 wasγ-Al2 O3 ,and N2 adsorption/desorption analysis confirmed that the meso-porous were obviously existed inγ-Al2 O3 . Adsorption experimental results indicated that the adsorption capacity of as prepared ad-sorbent to fluoride was higher at relative low pH. The adsorption capacity was increased as the increase of temperature. When the in-itial concentration of fluoride was 95mg·L-1 ,adsorption capacity was 58. 28mg·g-1 at 303K,while it was increased to 68. 27mg·g-1 at 323K. It was also found that the adsorption isotherms can be well described by the Langmuir equation. Furthermore,the adsorption rate of as prepared adsorbent to fluoride was very quickly at first 2 h and adsorption equilibrium was attended about 8 h,and its ad-sorption kinetics can be well fitted by using pseudo-second-order rate model. In addition,mesoporousγ-Al2 O3 can be easily regen-erated after saturated adsorption,exhibiting excellent repeated application property.