Department of Chemistry, College of Science, University of Hafr Al Batin, Al Jamiah District, P.O. Box 1803, Jeddah 39524, Saudi Arabia.
Department of Applied Chemistry, Faculty of Pharmaceutical Chemistry, Tehran Medical Sciences, Islamic Azad University, Tehran 1913674711, Iran.
Molecules. 2022 Dec 13;27(24):8841. doi: 10.3390/molecules27248841.
In this study, a novel biomass adsorbent based on activated carbon incorporated with sulfur-based binary metal oxides layered nanoparticles (SML-AC), including sulfur (S2), manganese (Mn), and tin (Sn) oxide synthesized via the solvothermal method. The newly synthesized SML-AC was studied using FTIR, FESEM, EDX, and BET to determine its functional groups, surface morphology, and elemental composition. Hence, the BET was performed with an appropriate specific surface area for raw AC (356 m2·g−1) and modified AC-SML (195 m2·g−1). To prepare water samples for ICP-OES analysis, the suggested nanocomposite was used as an efficient adsorbent to remove lead (Pb2+), cadmium (Cd2+), chromium (Cr3+), and vanadium (V5+) from oil-rich regions. As the chemical structure of metal ions is influenced by solution pH, this parameter was considered experimentally, and pH 4, dosage 50 mg, and time 120 min were found to be the best with high capacity for all adsorbates. At different experimental conditions, the AC-SML provided a satisfactory adsorption capacity of 37.03−90.09 mg·g−1 for Cd2+, Pb2+, Cr3+, and V5+ ions. The adsorption experiment was explored, and the method was fitted with the Langmuir model (R2 = 0.99) as compared to the Freundlich model (R2 = 0.91). The kinetic models and free energy (<0.45 KJ·mol−1) parameters demonstrated that the adsorption rate is limited with pseudo-second order (R2 = 0.99) under the physical adsorption mechanism, respectively. Finally, the study demonstrated that the AC-SML nanocomposite is recyclable at least five times in the continuous adsorption−desorption of metal ions.
在这项研究中，开发了一种新型生物质吸附剂，它基于活性炭与硫基二元金属氧化物层状纳米粒子（SML-AC）的复合材料，其中包含硫（S2）、锰（Mn）和锡（Sn）氧化物，采用溶剂热法合成。利用傅里叶变换红外光谱（FTIR）、场发射扫描电子显微镜（FESEM）、能谱（EDX）和比表面积分析仪（BET）对新合成的 SML-AC 进行了研究，以确定其官能团、表面形态和元素组成。因此，对原始活性炭（356 m2·g−1）和改性活性炭-SML（195 m2·g−1）进行了 BET 分析。为了制备用于电感耦合等离子体发射光谱（ICP-OES）分析的水样，建议使用纳米复合材料作为高效吸附剂，从富含油的地区去除铅（Pb2+）、镉（Cd2+）、铬（Cr3+）和钒（V5+）。由于金属离子的化学结构受溶液 pH 的影响，因此实验中考虑了该参数，结果发现 pH 4、用量 50 mg 和时间 120 min 是最佳条件，对所有吸附剂都具有较高的容量。在不同的实验条件下，活性炭-SML 对 Cd2+、Pb2+、Cr3+和 V5+离子的吸附容量分别为 37.03−90.09 mg·g−1。对吸附实验进行了探讨，并采用 Langmuir 模型（R2 = 0.99）对其进行了拟合，而 Freundlich 模型（R2 = 0.91）拟合效果较差。动力学模型和自由能（<0.45 KJ·mol−1）参数表明，吸附速率受限于物理吸附机制下的准二级动力学模型（R2 = 0.99）。最后，研究表明，在金属离子的连续吸附-解吸过程中，AC-SML 纳米复合材料至少可重复使用五次。
