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首页> 外文期刊>Separation and Purification Technology >Photoinduced catalytic adsorption of model contaminants on Bi/Cu pillared montmorillonite in the visible light range
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Photoinduced catalytic adsorption of model contaminants on Bi/Cu pillared montmorillonite in the visible light range

机译：Bi / Cu柱撑蒙脱石在可见光范围内对模型污染物的光诱导催化吸附

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Montmorillonite K10 clay was pillared with BiCl3 and Cu(NO3)2 to extend its applicability as catalytic adsorbent to degrade aqueous solution of anionic azo-dye methyl orange (MO) in the presence of visible light irradiation. The preparation of Bi/Cu-montmorillonite utilized benign precursors, mild reaction conditions and avoided the use of organic solvents. The as-prepared catalytic adsorbents were characterized by X-ray diffraction (XRD) and diffuse reflectance spectroscopy (DRS). Surface morphology was evaluated by means of scanning electron microscopy (SEM) equipped with EDS. The solution phase photocatalytic activity was assessed by the degradation of a relevant concentration of MO and dichlorophenol (DCP) in the presence of visible light irradiation from 300 W metal halogen desk lamp. Bi/Cu-pillared montmorillonite completely destroyed and bleached MO (initial concentration of 160 mg L~(-1) after adsorption in the dark) and completely degraded DCP (initial concentration of 86 mg L~(-1) after adsorption in the dark) in 120 and 240 min, respectively. It was also observed that the most effective dosage for the removal of MO and DCP, respectively, was 1 g L~(-1) (98% and 95% removal efficiencies) followed by 0.5 (82% and 70%), 2 (80% and 70%) and 3 g L~(-1) (75% and 65%). The reaction rates at 1 g L~(-1) catalyst loadings were k_d 2.1 x 10~(-2) min~(-1) and 1.18 x 10~(-2) min~(-1) for MO and DCP, respectively. Total organic carbon (TOC) decreased by 95 and 70% in 120 and 240 min of the treatment when MO and DCP, respectively, were introduced. Actual turnovers (ATON), turnover frequency (TOF) and quantum efficiency (Q_e) for MO, which was selected as the representative target contaminant for the photo-induced adsorption process, were 12.5,6.25 h~(-1) and 43.8%, respectively.
机译：蒙脱土K10粘土以BiCl3和Cu（NO3）2为柱基，以扩展其在可见光照射下降解阴离子偶氮染料甲基橙（MO）水溶液的催化吸附剂的适用性。 Bi / Cu-蒙脱土的制备利用了良好的前体，反应条件温和，避免了使用有机溶剂。所制备的催化吸附剂通过X射线衍射（XRD）和漫反射光谱（DRS）进行表征。通过配备EDS的扫描电子显微镜（SEM）评估表面形态。溶液相的光催化活性是通过在300 W金属卤素台灯照射可见光的情况下，将相应浓度的MO和二氯苯酚（DCP）降解来评估的。 Bi / Cu柱状蒙脱石完全破坏和漂白MO（在黑暗中吸附后的初始浓度为160 mg L〜（-1）），并完全降解DCP（在黑暗中吸附后的初始浓度为86 mg L〜（-1）） ）分别在120和240分钟内。还观察到，去除MO和DCP的最有效剂量分别为1 g L〜（-1）（去除效率为98％和95％），然后依次为0.5（82％和70％），2（ 80％和70％）和3 g L〜（-1）（75％和65％）。在1 g L〜（-1）催化剂负载下，MO和DCP的反应速率分别为k_d 2.1 x 10〜（-2）min〜（-1）和1.18 x 10〜（-2）min〜（-1），分别。当分别引入MO和DCP时，在120和240分钟内总有机碳（TOC）分别下降了95％和70％。用作光诱导吸附过程的代表性目标污染物的MO的实际周转率（ATON），周转频率（TOF）和量子效率（Q_e）分别为12.5、6.25 h〜（-1）和43.8％，分别。

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