Chemistry Department, Yasouj University, Yasouj 75914-35, Iran.
Chemistry Department, Yasouj University, Yasouj 75914-35, Iran.
Ultrason Sonochem. 2016 Sep;32:119-131. doi: 10.1016/j.ultsonch.2016.03.004. Epub 2016 Mar 2.
Chromium doped zinc oxide nanoparticles (ZnO: Cr-NPs) was synthesized by ultrasonically assisted hydrothermal method and characterized by FE-SEM, XRD and TEM analysis. Subsequently, this composite ultrasonically assisted was deposited on activated carbon (ZnO: Cr-NPs-AC) and used for simultaneous ultrasound-assisted removal of three toxic organic dye namely of malachite green (MG), eosin yellow (EY) and Auramine O (AO). Dyes spectra overlap in mixture (major problem for simultaneous investigation) of this systems was extensively resolved by derivative spectrophotometric method. The magnitude of variables like initial dyes concentration, adsorbent mass and sonication time influence on dyes removal was optimized using small central composite design (CCD) combined with desirability function (DF) approach, while pH was studied by one-a-time approach. The maximized removal percentages at desirability of 0.9740 was set as follow: pH 6.0, 0.019g ZnO: Cr-NPs-AC, 3.9min sonication at 4.5, 4.8 and 4.7mgL(-1) of MG, EY and AO, respectively. Above optimized points lead to achievement of removal percentage of 98.36%, 97.24%, and 99.26% correspond to MG, EY and AO, respectively. ANOVA for each dyes based p-value less than (<0.0001) suggest highly efficiency of CCD model for prediction of data concern to simultaneous removal of these dyes within 95% confidence interval, while their F-value for MG, EY and AO is 935, 800.2, and 551.3, respectively, that confirm low participation of this them in signal. The value of multiple correlation coefficient R(2), adjusted and predicted R(2) for simultaneous removal of MG is 0.9982, 0.9972 and 0.9940, EY is 0.9979, 0.9967 and 0.9930 and for AO is 0.9970, 0.9952 and 0.9939. The adsorption rate well fitted by pseudo second-order and Langmuir model via high, economic and profitable adsorption capacity of 214.0, 189.7 and 211.6mgg(-1) for MG, EY and AO, respectively.
采用超声辅助水热法合成了掺铬氧化锌纳米粒子（ZnO:Cr-NPs），并通过 FE-SEM、XRD 和 TEM 分析进行了表征。随后，将该复合材料通过超声辅助沉积在活性炭（ZnO:Cr-NPs-AC）上，并用于同时超声辅助去除三种有毒有机染料，即孔雀石绿（MG）、曙红 Y（EY）和金胺 O（AO）。通过导数分光光度法，对该体系混合物中染料光谱重叠（同时研究的主要问题）进行了广泛的解析。通过小中心组合设计（CCD）与可接受性函数（DF）方法的结合，优化了初始染料浓度、吸附剂质量和超声时间等变量对染料去除的影响，而 pH 值则通过一次实验法进行了研究。在可接受性为 0.9740 时，设定了最大去除百分比为：pH6.0、0.019g ZnO:Cr-NPs-AC、4.5、4.8 和 4.7mgL(-1)的 MG、EY 和 AO 的超声时间分别为 3.9min。在优化点以上，MG、EY 和 AO 的去除率分别达到 98.36%、97.24%和 99.26%。基于每个染料的 ANOVA 的 p 值小于 (<0.0001) 表明 CCD 模型对于预测这些染料同时去除的实验数据具有很高的效率，置信区间为 95%，而它们对于 MG、EY 和 AO 的 F 值分别为 935、800.2 和 551.3，这表明它们在信号中参与度较低。MG 的同时去除的多元相关系数 R(2)、调整和预测 R(2)的值分别为 0.9982、0.9972 和 0.9940，EY 分别为 0.9979、0.9967 和 0.9930，AO 分别为 0.9970、0.9952 和 0.9939。吸附速率通过准二级和 Langmuir 模型拟合良好，MG、EY 和 AO 的吸附容量分别为 214.0、189.7 和 211.6mgg(-1)，具有高、经济和有利的吸附能力。
