Department of Chemistry, College of Science and Arts, Jouf University, Al Qurayyat, 75911, Kingdom of Saudi Arabia.
Department of Chemistry, College of Science, Jouf University, P.O. Box 2014, Sakaka, Aljouf, Kingdom of Saudi Arabia.
Environ Sci Pollut Res Int. 2023 Oct;30(49):108247-108262. doi: 10.1007/s11356-023-29649-5. Epub 2023 Sep 25.
Water pollution by synthetic anionic dyes is one of the most critical ecological concerns and challenges. Therefore, there is an urgent need to find an efficient adsorbent and photocatalyst for dye removal. In the present study, we aimed to fabricate a hybrid mesoporous composite of spongy sphere-like SnO and three-dimensional (3D) cubic-like MgO (SnO/MgO) as a promising adsorbent/photocatalyst to remove the anionic sunset yellow (SSY) dye from real wastewater at neutral pH conditions. The as-synthesized SnO and MgO composite was investigated using XRD, SEM, EDX, TEM, XPS, BET, and zeta potential. The experimental study of the SSY removal using SnO/MgO composite was performed at different conditions, such as pH, stirring time, dose, and temperature. More than 99% of 10 mg/L SSY was effectively adsorbed from aqueous solution using 40 mg of SnO/MgO composite at pH 7 and a stirring time of 60 min. The SSY adsorption behavior was well fitted by pseudo-second order and the Langmuir model, indicating that the SSY was chemisorbed to the composite-active sites as a monolayer. On the other hand, photocatalytic degradation process exhibited better results in terms of speed of removal and used quantity of photocatalyst, where 20 mg of SnO/MgO composite can be used to remove > 99% of SSY dye within 30 min. Mechanism of SSY adsorption and photocatalytic degradation was discussed. In addition, elution experiments demonstrated that the SnO/MgO composite as an SSY adsorbent could be reused for nine cycles without considerable reduction in the SSY adsorption efficiency. Therefore, this work exhibited that the mesoporous SnO/MgO composite can be considered an effective adsorbent/photocatalyst to remove SSY dye from real industrial effluent water at neutral pH conditions.
水污染是由合成阴离子染料造成的，这是最关键的生态问题和挑战之一。因此，迫切需要寻找一种高效的吸附剂和光催化剂来去除染料。在本研究中，我们旨在制备一种具有海绵状球体状 SnO 和三维（3D）立方状 MgO 的混合介孔复合材料（SnO/MgO），作为一种有前途的吸附剂/光催化剂，在中性 pH 条件下从实际废水中去除阴离子日落黄（SSY）染料。使用 XRD、SEM、EDX、TEM、XPS、BET 和 zeta 电位对合成的 SnO 和 MgO 复合材料进行了研究。在不同条件下，如 pH、搅拌时间、剂量和温度，对使用 SnO/MgO 复合材料去除 SSY 的实验进行了研究。使用 40mg 的 SnO/MgO 复合材料在 pH 为 7 和搅拌时间为 60min 的条件下，可有效从水溶液中吸附 10mg/L 的 SSY 超过 99%。SSY 吸附行为很好地符合准二级和 Langmuir 模型，表明 SSY 作为单层化学吸附到复合材料的活性位点上。另一方面，光催化降解过程在去除速度和光催化剂用量方面表现出更好的效果，其中 20mg 的 SnO/MgO 复合材料可在 30min 内去除超过 99%的 SSY 染料。讨论了 SSY 吸附和光催化降解的机理。此外，洗脱实验表明，SnO/MgO 复合材料作为 SSY 吸附剂可重复使用九次，而 SSY 吸附效率没有明显降低。因此，这项工作表明，介孔 SnO/MgO 复合材料可被视为在中性 pH 条件下从实际工业废水中去除 SSY 染料的有效吸附剂/光催化剂。
