Department of Environmental Sciences, Fatima Jinnah Women University, The Mall, Rawalpindi 46000, Pakistan.
Department of Environmental Sciences, Fatima Jinnah Women University, The Mall, Rawalpindi 46000, Pakistan.
Ultrason Sonochem. 2021 Jan;70:105299. doi: 10.1016/j.ultsonch.2020.105299. Epub 2020 Aug 4.
Spherical shaped nano-size aluminium oxide and its hybrids with indole and indole derivatives have been synthesized using sol-gel and post grafting methods coupled with sonication (Branson Digital SonifierS-250D; 20 kHz; 40%) for the remediation of toxic metals (lead and mercury). Different spectroscopic techniques (FTIR, SEM, BET, XRD, and XPS) have been applied to assess the properties of synthesized aluminium oxide and its hybrids. FTIR spectra showed the absorption bands of aluminium oxide (Al-O-Al) and aluminium hybrids (Al-O-C) at 800-400 cm and 1650-1100 cm region, respectively. SEM showed spherical shaped clusters of aluminium oxide which changed into the net-shape structure after the hybrid synthesis. It is worth noting that sonication energy increases the total surface area of aluminium oxide when it gets hybridized with indole and its derivatives from 82 m/g to 167 m/g; it also improved the product yield from 68% to 78%. Simultaneously, FTIR, SEM and BET analysis of non-sonicated aluminium oxide and its hybrids were also recorded for comparison. While XRD and XPS analysis were only conducted for sonicated aluminium oxide and its hybrids to manifest the structural and compositional properties. XRD patterns indexed as the cubic crystal system with an average 41 nm crystallite size of sonicated aluminium oxide which remains unaffected after hybrid synthesis. A survey scan under XPS confirmed the presence of all expected elements (aluminium, oxygen, carbon, nitrogen) and deconvolution of each recorded peak showed binding of element with its neighboring elements. The performance of aluminium oxide and its hybrids synthesize with and without sonication are also evaluated using a time-dependent batch adsorption protocol optimize for one hour. The maximum adsorption of lead (37%) and mercury (40%) are found onto sonicated aluminium oxide. The sonicated aluminium hybrids showed 43-63% of lead and 55-67% of mercury at pH 7. The fitness of experimental data using adsorption kinetics and isotherms revealed that adsorption follows Pseudo-second-order kinetic, Langmuir, and Freundlich isotherms.
采用溶胶-凝胶法和后接枝法，结合超声（Branson Digital SonifierS-250D；20 kHz；40%），合成了球形纳米氧化铝及其与吲哚和吲哚衍生物的混合物，用于修复有毒金属（铅和汞）。应用不同的光谱技术（FTIR、SEM、BET、XRD 和 XPS）来评估合成氧化铝及其混合物的性能。FTIR 光谱显示氧化铝（Al-O-Al）和铝基混合物（Al-O-C）的吸收带分别在 800-400 cm 和 1650-1100 cm 区域。SEM 显示氧化铝呈球形簇状，在杂化合成后变成网状结构。值得注意的是，当与吲哚及其衍生物杂化时，超声能增加氧化铝的总表面积，从 82 m/g 增加到 167 m/g；它还将产率从 68%提高到 78%。同时，还记录了未超声处理的氧化铝及其混合物的 FTIR、SEM 和 BET 分析结果，以便进行比较。而 XRD 和 XPS 分析仅针对超声处理的氧化铝及其混合物进行，以显示其结构和组成特性。XRD 图谱索引为立方晶系，平均晶粒尺寸为 41nm 的超声处理氧化铝在杂化合成后保持不变。XPS 的全扫描证实了所有预期元素（铝、氧、碳、氮）的存在，并且对每个记录峰的分解表明元素与其相邻元素的结合。还通过优化一小时的时间依赖批量吸附协议，评估了有和没有超声处理的氧化铝及其混合物的性能。超声处理的氧化铝对铅（37%）和汞（40%）的最大吸附量。超声处理的铝基混合物在 pH 7 时对铅的吸附率为 43-63%，对汞的吸附率为 55-67%。使用吸附动力学和等温线拟合实验数据表明，吸附遵循准二级动力学、朗缪尔和弗罗因德利希等温线。
Zotero 插件
