Khedr Abdalla M, Elwakiel Nadia, Halawia Sameh E, Mansour Ramadan Abdelghany
Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt.
Basic Sciences and Engineering Department, Higher Institute of Engineering and Technology, New Damietta, 34517, Egypt.
Sci Rep. 2024 Jul 5;14(1):15523. doi: 10.1038/s41598-024-65043-y.
Andesite was employed to effectively extract mercury(II) in an aqueous solution. After evaluating its characteristics, andesite was characterized by applying modern techniques such as BET and TGA methods. The study employed SEM and TEM measurements to analyze the variation in the surface shape and crystallinity of the metal due to adsorption. Using the EDX process, the chemical composition, weight, and atomic percentage of each element of andesite were determined. FTIR techniques were also used to confirm the TEM-EDX findings. Zeta potential was estimated. Cycles of regeneration and desorption have been examined. 99.03% was the highest uptake percentage. Adsorbent quantity (0.0025-0.05) g/L, contact time (5-60) min, pH (2-10), temperature (25-60) °C, and dose (0.0027, 0.0044, 0.0125, 0.0155, and 0.0399) mg/L all affect the amount of removal that increases with the increase in contact time, pH, dose, and temperature but drops as the metal ion concentration rises. The ideal values for contact time, pH, metal ion concentration, dose, and temperature were found to be, respectively, 30 min, 0.0155 mg/l, 0.02 g/l, and 40 °C. The calculation of thermodynamic parameters, including ΔH, ΔG, and ΔS, was imperative in establishing that the mechanism of heavy metal adsorption on andesite was endothermic, exhibiting a physical nature that escalated with temperature rise. The Freundlich adsorption equation's linear form is matched by the adsorption of mercury(II) on andesite; constant n was 1.85, 1.06, 1.1, and 1.1, whereas the Langmuir constant q was found to be 1.85, 2.41, 3.54, and 2.28 mg/g at 25-60 °C. Furthermore, adsorption follows a pseudo-second-order rate constant of (3.08, 3.24, 3.24, and 13) g/mg/min under identical temperature conditions, as opposed to a first-order rate constant of 4, 3, 2.6, and 2. Hg, NH, Cl, Br, NO, SO, Na, K, HS, and CHSH were all extracted from wastewater by this application.
使用安山岩有效地萃取水溶液中的汞(II)。在评估其特性之后，通过应用诸如BET和TGA方法等现代技术对安山岩进行了表征。该研究采用扫描电子显微镜（SEM）和透射电子显微镜（TEM）测量来分析由于吸附导致的金属表面形状和结晶度的变化。使用能量散射X射线光谱（EDX）方法确定了安山岩中各元素的化学成分、重量和原子百分比。还使用傅里叶变换红外光谱（FTIR）技术来证实TEM-EDX的研究结果。估算了zeta电位。研究了再生和解吸循环。最高吸附率为99.03%。吸附剂用量（0.0025 - 0.05）g/L、接触时间（5 - 60）分钟、pH值（2 - 10）、温度（25 - 60）°C和剂量（0.0027、0.0044、0.0125、0.0155和0.0399）mg/L均会影响去除量，去除量随接触时间、pH值、剂量和温度的增加而增加，但随金属离子浓度的升高而下降。发现接触时间、pH值、金属离子浓度、剂量和温度的理想值分别为30分钟、0.0155 mg/l、0.02 g/l和40 °C。计算包括ΔH、ΔG和ΔS在内的热力学参数对于确定安山岩对重金属的吸附机制是吸热的至关重要，这表明其具有随温度升高而增强的物理性质。汞(II)在安山岩上的吸附符合弗伦德利希吸附方程的线性形式；常数n为1.85、1.06、1.1和1.1，而在25 - 60 °C时，朗缪尔常数q分别为1.85、2.41、3.54和2.28 mg/g。此外，在相同温度条件下，吸附遵循伪二级速率常数（3.08、3.24、3.24和13）g/mg/min，而一级速率常数为4、3、2.6和2。通过该应用从废水中萃取了汞、铵、氯、溴、硝酸根、硫酸根、钠、钾、硫氢根和甲硫醇。
