Chemistry Department, Faculty of Science, Damanhour University, Damanhour 22511, Egypt.
Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications, Alexandria 21934, Egypt.
Int J Biol Macromol. 2023 Sep 30;249:126075. doi: 10.1016/j.ijbiomac.2023.126075. Epub 2023 Aug 2.
This work aims to examine the two techniques' efficiency for the elimination of malachite green (MG) by photocatalytic degradation and adsorption onto synthesized solid nanomaterials. Three solid samples were prepared as calcium alginate (AG), nanotitania (NT), and nanotitania/calcium alginate composite (TG). The morphological and physicochemical characteristics of the solid nanomaterials were investigated by XRD, TGA, DRS, FTIR, pH nitrogen adsorption/desorption isotherm, SEM, and TEM. The main experimental conditions were determined for sample dose, shaking time, pH, initial malachite green concentration, temperature, ionic strength, and UV lamp power. The resulting data proved that TG attained the higher adsorption capacity (252.52 mg/g) at 40 °C. The adsorption of MG was well fitted by Langmuir, Temkin, Dubinin-Radushkevich, pseudo-second order, intra-particle diffusion, and Elovich models onto all the prepared samples, confirming the endothermic, spontaneous, and favorable adsorption process. The maximum degradation percent (99.6 %) of MG was achieved by using 1.0 g/L as a catalyst dose, 10 mg/L of initial MG concentration, and 33 W for TG. The photodegradation of MG was well fitted by Eyring-Polanyi and Arrhenius models onto the surface of catalyst. The TG reusability resulted in a decrease in the degradation efficiency by 9.8 %, indicating its great capacity as the first nanotitania/calcium alginate nanocomposite used in removing MG from wastewater by two technologies in the same article.
这项工作旨在研究两种技术在光催化降解和吸附到合成固体纳米材料上去除孔雀石绿（MG）的效率。制备了三种固体样品：海藻酸钠（AG）、纳米二氧化钛（NT）和纳米二氧化钛/海藻酸钠复合材料（TG）。通过 XRD、TGA、DRS、FTIR、pH 值氮气吸附/解吸等温线、SEM 和 TEM 研究了固体纳米材料的形态和物理化学特性。主要实验条件确定为样品剂量、搅拌时间、pH 值、初始孔雀石绿浓度、温度、离子强度和 UV 灯功率。所得数据证明 TG 在 40°C 时达到了较高的吸附容量（252.52 mg/g）。MG 的吸附在所有制备的样品上都很好地符合朗缪尔、坦金、杜比宁-拉德什科夫、伪二阶、内扩散和埃洛维奇模型，证实了吸附过程是吸热的、自发的和有利的。使用 1.0 g/L 作为催化剂剂量、10 mg/L 的初始 MG 浓度和 33 W 的 TG 可实现 MG 的最大降解百分比（99.6%）。MG 的光降解在催化剂表面上很好地符合 Eyring-Polanyi 和 Arrhenius 模型。TG 的可重复使用性导致降解效率下降了 9.8%，这表明它作为第一个纳米二氧化钛/海藻酸钠纳米复合材料，在同一篇文章中通过两种技术从废水中去除 MG 具有很大的潜力。
