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首页> 外文期刊>New Journal of Chemistry >Phenol removal from wastewater by CWPO process over the Cu-MOF nanocatalyst: process modeling by response surface methodology (RSM) and kinetic and isothermal studies
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Phenol removal from wastewater by CWPO process over the Cu-MOF nanocatalyst: process modeling by response surface methodology (RSM) and kinetic and isothermal studies

机译：通过CU-MOF纳米催化剂的CWPO过程从废水中除去酚：通过响应表面方法（RSM）和动力学和等温研究的过程建模

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Water-stable metal-organic frameworks (MOFs), which possess unique porous structures, have attracted attention from scientists exploring novel and efficient methods for the elimination of phenol compounds from aqueous media. The numerous properties of MOFs such as tunable porosity, hierarchical structure, immense pore volume, and specific surface area, together with their excellent adsorption and recyclability performances offer new insight compared to traditional catalysts. Herein, Cu-MOF was synthesized and characterized via FTIR, BET, XRD, TEM, and SEM. Results indicated the formation of nanostructured Cu-MOF with mesoporous and macroporous characteristics. Cu-MOF was employed as a new catalyst in the catalytic wet peroxide oxidation (CWPO) of phenol. The central composite design of the RSM (response surface methodology) approach was used for the design of the CWPO process in the statistical study of the removal of phenol from wastewater. The RSM methodology predicted that the optimal conditions for the phenol degradation occured at phenol concentration 400 ppm, Cu-MOF amount (1.5 g L-1) at 50 degrees C for 30 min. The phenol removal percentage under optimal conditions was predicted by RSM to be 91.4% where experimental test resulted 91.87% removal of phenol. The order of the relative significance of variables predicted by the Pareto analysis was as follows: temperature (X-3) > concentration (X-1) > adsorbent dosage (X-2) > contact time (X-4). Furthermore, the isotherms (Langmuir and Freundlich) and kinetics of phenol oxidation in the CWPO process were investigated for the adsorption of phenol on Cu-MOF. The average values of the empirical constant, adsorption constant (saturation coefficient) and R-2 for the Langmuir equation were q(m) = 500 mg g(-1), K-L = 0.19 L mg and 0.88, respectively. The average values of the Freundlich adsorption constant, empirical coefficient and R-2 were K-f = 1.44 mg g(-1), n = 0.66 L mg(-1) and 0.94, respectively. The results indicated that the data was better fitted with the Freundlich model. Finally, the kinetics of the process was confirmed to correspond to the pseudo-second-order equation.
机译：水稳性金属有机骨架（MOF）具有独特的多孔结构，在探索从水介质中去除酚类化合物的新方法时引起了科学家们的关注。与传统催化剂相比，MOF的许多特性，如可调孔隙率、层次结构、巨大的孔体积和比表面积，以及其优异的吸附和可回收性能，提供了新的见解。在本文中，通过FTIR、BET、XRD、TEM和SEM合成并表征了Cu-MOF。结果表明，纳米结构的Cu-MOF的形成具有中孔和大孔特征。将铜-多氟醚作为一种新型催化剂用于苯酚的催化湿式过氧化氢氧化（CWPO）。在废水中苯酚去除的统计研究中，CWPO工艺的设计采用了RSM（响应面法）方法的中心复合设计。RSM方法预测苯酚降解的最佳条件为苯酚浓度400ppm，铜MOF量（1.5g L-1）在50℃下30分钟。RSM预测最佳条件下的苯酚去除率为91.4%，其中实验测试结果表明苯酚去除率为91.87%。帕累托分析预测变量的相对显著性顺序如下：温度（X-3）>浓度（X-1）>吸附剂用量（X-2）>接触时间（X-4）。此外，还研究了CWPO过程中苯酚在Cu-MOF上吸附的等温线（Langmuir和Freundlich）和动力学。Langmuir方程的经验常数、吸附常数（饱和系数）和R-2的平均值分别为q（m）=500 mg g（-1）、K-L=0.19 L mg和0.88。Freundlich吸附常数、经验系数和R-2的平均值分别为K-f=1.44 mg g（-1）、n=0.66 L mg（-1）和0.94。结果表明，数据更符合Freundlich模型。最后，该过程的动力学符合伪二级方程。

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