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Study on Modified Zeolite Synthesized from Coal Fly Ash in Adsorption and Desorption of Ammonia Nitrogen

机译：氨氮吸附和解吸中煤粉煤灰合成改性沸石的研究

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The "Twelfth Five-Year" plan of China starts at the emission reduction task in controlling the total amount of ammonia nitrogen. Therefore, the method of how to remove ammonia nitrogen quickly and effectively will be the key point of wastewater treatment. In the current paper, One zeolite synthesized from coal fly ash (P-type zeolite, ZP) was prepared and then modified using lanthanum. The structure of the zeolite was characterized by means of SEM, X-ray, TG-DSC, and the like. The characteristics of ZP and lanthanum-modified ZP (LaZP) in the adsorption and desorption of ammonia nitrogen were simultaneously studied, wherein the results show that ZP and LaZP are featured with obvious crystal characteristics, lots of gap structures, and a strong characteristic peak of P-type zeolite shown in the XRD atlas. For the LaZP, the adsorption equilibrium can be carried out in 30 min. The data for the adsorption dynamics to the ammonia nitrogen are in line with the pseudo-second order kinetics equation, and the adsorption isotherme is well fitted to the Langmuir model. The regeneration test shows that the desorption rate of ammonia nitrogen is proportional to the concentration of NaCl when the pH is about 7. The desorption rate of LaZP to the ammonia nitrogen can reach 90% when the concentration of NaCl is 0.4 mol/l, and the desorption rate of ZP is 70%. Compared with ZP, the desorption speed of the LaZP is quicker, the adsorption equilibrium can be carried out in 6 h, and the adsorption equilibrium of ZP can be slowly carried out in 10 h. Moreover, the adsorption and desorption properties of the LaZP are greatly improved.
机译：中国的“十二五”规划开始在控制氨氮总量减排任务。因此，如何快速有效地去除氨氮和方法将是废水处理的关键点。在当前的纸，一种沸石从煤飞灰（P型沸石，ZP）制备合成，然后使用镧改性。沸石的结构进行表征通过SEM，X射线，TG-DSC等。 ZP和镧改性的吸附和氨氮的解吸ZP（LaZP）的特性进行同时研究，其中，所述结果表明，ZP和LaZP与明显晶体特性，大量的间隙的结构，和强烈特征峰精选在XRD图谱所示的P型沸石。对于LaZP，吸附平衡可以在30分钟内进行。用于吸附动力学氨氮的数据与伪二阶动力学方程线，并且所述吸附isotherme是公嵌合于Langmuir模型。再生试验表明，氨氮的解吸速率正比于NaCl浓度时pH为约7。LaZP的解吸速率的氨氮可以达到90％时的NaCl浓度为0.4摩尔/升，和ZP的解吸率为70％。与ZP相比，LaZP的解吸速度更快，吸附平衡可以在6小时进行，ZP的吸附平衡可以在10 H缓慢进行。此外，LaZP的吸附和解吸性能大大提高。

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