Dong Yingbo, Lin Hai, He Yinhai
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Environ Monit Assess. 2017 Mar;189(3):107. doi: 10.1007/s10661-017-5806-9. Epub 2017 Feb 16.
The physicochemical properties of the 24 modified clinoptilolite samples and their ammonia-nitrogen removal rates were measured to investigate the correlation between them. The modified clinoptilolites obtained by acid modification, alkali modification, salt modification, and thermal modification were used to adsorb ammonia-nitrogen. The surface area, average pore width, macropore volume, mecropore volume, micropore volume, cation exchange capacity (CEC), zeta potential, silicon-aluminum ratios, and ammonia-nitrogen removal rate of the 24 modified clinoptilolite samples were measured. Subsequently, the linear regression analysis method was used to research the correlation between the physicochemical property of the different modified clinoptilolite samples and the ammonia-nitrogen removal rate. Results showed that the CEC was the major physicochemical property affecting the ammonia-nitrogen removal performance. According to the impacts from strong to weak, the order was CEC > silicon-aluminum ratios > mesopore volume > micropore volume > surface area. On the contrary, the macropore volume, average pore width, and zeta potential had a negligible effect on the ammonia-nitrogen removal rate. The relational model of physicochemical property and ammonia-nitrogen removal rate of the modified clinoptilolite was established, which was ammonia-nitrogen removal rate = 1.415[CEC] + 173.533 [macropore volume] + 0.683 [surface area] + 4.789[Si/Al] - 201.248. The correlation coefficient of this model was 0.982, which passed the validation of regression equation and regression coefficients. The results of the significance test showed a good fit to the correlation model.
测量了24个改性斜发沸石样品的物理化学性质及其氨氮去除率，以研究它们之间的相关性。采用酸改性、碱改性、盐改性和热改性得到的改性斜发沸石吸附氨氮。测定了24个改性斜发沸石样品的比表面积、平均孔径、大孔体积、中孔体积、微孔体积、阳离子交换容量（CEC）、ζ电位、硅铝比和氨氮去除率。随后，采用线性回归分析方法研究不同改性斜发沸石样品的物理化学性质与氨氮去除率之间的相关性。结果表明，CEC是影响氨氮去除性能的主要物理化学性质。按影响由强到弱的顺序为：CEC＞硅铝比＞中孔体积＞微孔体积＞比表面积。相反，大孔体积、平均孔径和ζ电位对氨氮去除率的影响可忽略不计。建立了改性斜发沸石物理化学性质与氨氮去除率的关系模型，即氨氮去除率=1.415[CEC]+173.533[大孔体积]+0.683[比表面积]+4.789[Si/Al]-201.248。该模型的相关系数为0.982，通过了回归方程和回归系数的检验。显著性检验结果表明该相关模型拟合良好。
