Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, Iran.
Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran.
Sci Rep. 2022 Jul 20;12(1):12381. doi: 10.1038/s41598-022-16676-4.
The zinc sulfide/copper oxide-carbon nanotube nanocomposite (ZnS/CuO-CNT) was fabricated by using an in-situ hydrothermal synthesis method and was used for simultaneous ultrasound-assisted adsorptive removal of a binary mixture of ponceau 4R (P4R) and tartrazine (TA) acid food dyes from contaminated water. The as-synthesized ZnS/CuO-CNT was described by FESEM, XRD, FTIR, BET, and zeta potential analysis. The results included nested network morphology, high purity with the crystalline structure, oxygen-containing functional groups, mesoporous/micropores texture with cumulate interspace, specific surface area of 106.54 m g, and zero-point charge (pH) of 5.3. In adsorption experiments, the simultaneous effect of main independent variables, including solution pH, adsorbent dosage, concentration of each dye, temperature, and sonication time on the removal efficiency of dyes was studied systematically using the central composite design (CCD) method based on response surface methodology (RSM). Also, the second-order multivariate equation was presented to determine the relationship between the removal efficiencies of P4R and AT dyes and six independent effective variables. The high correlation coefficient (R ≥ 0.99), significant p-value (P < 0.0001), and non-significant lack-of-fit (P > 0.05) showed the high accuracy, and validity of the proposed model to predict the removal efficiency of P4R and TA acid food dyes. The experimental removal efficiency for P4R and TA dyes was found to be 98.45 ± 2.54, and 99.21 ± 2.23, respectively. Also, the Langmuir maximum adsorption capacity for P4R and TA dyes was determined to be 190.1 mg g and 183.5 mg g, respectively. Finally, the adsorbent's reusability was tested for six periods and could be reused repeatedly without significant reduction in adsorption performance.
硫化锌/氧化铜-碳纳米管纳米复合材料（ZnS/CuO-CNT）是通过原位水热合成方法制备的，用于同时超声辅助吸附去除受污染水中的对位红 4R（P4R）和柠檬黄（TA）酸食品染料的二元混合物。通过 FESEM、XRD、FTIR、BET 和 ζ 电位分析对合成的 ZnS/CuO-CNT 进行了描述。结果包括嵌套网络形态、高纯度的结晶结构、含氧官能团、具有累积间隔的中孔/微孔结构、比表面积为 106.54 m²/g 和零电荷（pH）为 5.3。在吸附实验中，系统地研究了主要独立变量（包括溶液 pH、吸附剂用量、每种染料的浓度、温度和超声时间）对染料去除效率的同时影响，使用基于响应面法（RSM）的中心复合设计（CCD）方法。此外，还提出了一个二阶多元方程，以确定 P4R 和 AT 染料去除效率与六个独立有效变量之间的关系。高相关系数（R≥0.99）、显著的 p 值（P<0.0001）和非显著的失拟项（P>0.05）表明该模型对预测 P4R 和 TA 酸食品染料的去除效率具有很高的准确性和有效性。实验中对位红和 TA 染料的去除效率分别为 98.45±2.54%和 99.21±2.23%。此外，还确定了 P4R 和 TA 染料的 Langmuir 最大吸附容量分别为 190.1 mg/g 和 183.5 mg/g。最后，对吸附剂的重复使用性能进行了六次测试，结果表明，在不显著降低吸附性能的情况下，该吸附剂可以重复使用。
