CAJ | 학술논문

利用粉煤灰合成改性沸石吸附Cr(VI)与F-,考察沸石投加量、初始pH、吸附时间对其竞争吸附效果的影响,研究沸石吸附Cr(VI)与F-的吸附等温线和吸附动力学模型。结果表明,沸石投加量、初始pH与吸附时间均对沸石吸附Cr(VI)与F-的效果影响显著。沸石对Cr(VI)与F-吸附去除率随着沸石投加量的增加而提高,而单位质量的沸石吸附剂对Cr(VI)与F-的吸附容量均不断下降。沸石对Cr(VI)的吸附去除率随初始pH升高而降低,而对F-的吸附去除率随初始pH升高先下降再上升。沸石对两种离子的吸附去除率随着吸附时间的延长而不断提高,且竞争吸附主要集中在90 min以内完成。在整个吸附过程中,Cr(VI)在竞争吸附过程中占优势,两种离子的吸附顺序始终为Cr(VI)﹥F-。沸石对Cr(VI)与F-的吸附过程均更符合Freundlich吸附等温模型,且准二级动力学方程能够较好的描述沸石对两种离子的吸附行为。
이용분매회합성개성비석흡부Cr(VI)여F-,고찰비석투가량、초시pH、흡부시간대기경쟁흡부효과적영향,연구비석흡부Cr(VI)여F-적흡부등온선화흡부동역학모형。결과표명,비석투가량、초시pH여흡부시간균대비석흡부Cr(VI)여F-적효과영향현저。비석대Cr(VI)여F-흡부거제솔수착비석투가량적증가이제고,이단위질량적비석흡부제대Cr(VI)여F-적흡부용량균불단하강。비석대Cr(VI)적흡부거제솔수초시pH승고이강저,이대F-적흡부거제솔수초시pH승고선하강재상승。비석대량충리자적흡부거제솔수착흡부시간적연장이불단제고,차경쟁흡부주요집중재90 min이내완성。재정개흡부과정중,Cr(VI)재경쟁흡부과정중점우세,량충리자적흡부순서시종위Cr(VI)﹥F-。비석대Cr(VI)여F-적흡부과정균경부합Freundlich흡부등온모형,차준이급동역학방정능구교호적묘술비석대량충리자적흡부행위。
The experiments were conducted to examine the adsorption of Cr(VI) and F- ions through synthesizing modified (K) zeolite from coal fly ash. The adsorbent dosage, the initial pH and the adsorption reaction time were investigated to study the competitive adsorption effect of Cr(VI) and F- ions. The adsorption isotherm and the adsorption kinetics equation were also discussed. The results showed that, the adsorbent dosage, initial pH and had significant effects on the competitive adsorption of Cr(VI) and F- ions. With the increasing of the adsorbent dosage, the adsorption removal rate of Cr(VI) and F- ions by zeolite were all improved, and the saturated adsorption capacity of two ions were decreased gradually. With the increasing of initial pH, the adsorption removal rate of Cr(VI) was decreased, while the adsorption removal rate of F- ion was increased firstly, and then decreased. The adsorption removal rate of Cr(VI) and F- ions by modified zeolite were all improved with the increasing of reaction time, and the competitive adsorption mainly completed within 90 minutes. In the whole process of adsorption, the adsorption of Cr(VI) predominated in the competitive adsorption process. The competitive adsorption sequence of Cr(VI) and F- ions was Cr(VI) ﹥F-. The adsorption process of Cr(VI) and F- ions accorded with Freundlich adsorption isotherm. The adsorption reaction to the Cr(VI) and F- ions matched to the pseudo-second class reac-tion kinetics model.