Efficient removal of lead and copper ions in aqueous solution by glutamic acid-functionalized SBA-15,International Journal of Environmental Science and Technology

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Efficient removal of lead and copper ions in aqueous solution by glutamic acid-functionalized SBA-15
International Journal of Environmental Science and Technology ( IF 3.0 ) Pub Date : 2021-09-07 , DOI: 10.1007/s13762-021-03646-y
Chunlai Wu ₁ , Qiong Liu ₁ , Chuanyun Peng ₁ , Wenwen Xu ₁

Affiliation

In this work, novel glutamic acid-functionalized SBA-15 was prepared for sensitive and selective lead and copper ions removal from wastewater sample. The material was characterized by X-ray diffractometry, scanning electron microscope, Brunauer–Emmett–Teller surface area measurement and Fourier transform infrared spectroscopy. The as-prepared material maintains the coordination properties of glutamic acid to lead and copper ions and exhibited better adsorption performance than that of pure SBA-15. The effects of different parameters such as pH of the solution, adsorption time, initial concentration, ion selectivity and regeneration were investigated on the Pb(II) and Cu(II) adsorption by the prepared adsorbent. It was found that the adsorption process can reach equilibrium within 20 min and can be described by pseudo-second-order kinetic model. Adsorption isotherm analysis showed that the adsorption was in accordance with Langmuir adsorption isotherm model, and the maximum adsorption capacity of lead and copper ions was 12.14 mg/g and 13.29 mg/g, respectively. In addition, common co-existed ions have no interference on Pb(II) and Cu(II) adsorption. Moreover, adsorption–elution cyclic results demonstrated that Pb(II)- and Cu(II)-adsorbed composite adsorbent could be effectively regenerated by 0.5 mol/L of HCl, and the regenerated adsorbent could be employed for repeated use without significant deterioration in its real performances, demonstrating the good stability of the adsorbents. Therefore, the composite adsorbent can be used potentially to remove Pb(II) and Cu(II) ions from water samples in practical applications for environmental remediation.

Graphic abstract

Glutamic acid-functionalized SBA-15 can be used as adsorbent for efficient adsorption/desorption of Pb(II) and Cu(II) from wastewater.

中文翻译：

谷氨酸功能化SBA-15高效去除水溶液中的铅和铜离子

在这项工作中，制备了新型谷氨酸功能化的 SBA-15，用于灵敏和选择性地去除废水样品中的铅和铜离子。该材料通过 X 射线衍射、扫描电子显微镜、Brunauer-Emmett-Teller 表面积测量和傅里叶变换红外光谱进行表征。所制备的材料保持了谷氨酸与铅和铜离子的配位特性，并表现出比纯 SBA-15 更好的吸附性能。研究了溶液pH、吸附时间、初始浓度、离子选择性和再生等不同参数对制备的吸附剂吸附Pb(II)和Cu(II)的影响。发现吸附过程可以在20分钟内达到平衡，并且可以用准二级动力学模型来描述。吸附等温线分析表明，吸附符合Langmuir吸附等温线模型，对铅和铜离子的最大吸附容量分别为12.14 mg/g和13.29 mg/g。此外，常见的共存离子对 Pb(II) 和 Cu(II) 吸附没有干扰。此外，吸附-洗脱循环结果表明，0.5 mol/L HCl 可有效再生 Pb(II)-和 Cu(II)-吸附的复合吸附剂，再生后的吸附剂可重复使用而不会显着劣化。真实的性能，证明了吸附剂的良好稳定性。因此，在环境修复的实际应用中，复合吸附剂可潜在地用于去除水样中的 Pb(II) 和 Cu(II) 离子。