Noraee Zahra, Jafari Ali, Ghaderpoori Mansour, Kamarehie Bahram, Ghaderpoury Afshin
1Department of Environmental Health Engineering, School of Health and Nutrition, Lorestan University of Medical Sciences, Khorramabad, Iran.
2Nutritional Health Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran.
J Environ Health Sci Eng. 2019 Jun 18;17(2):701-709. doi: 10.1007/s40201-019-00385-8. eCollection 2019 Dec.
Chromium is one of the heavy metals found in industrial wastewaters, which have highly toxic to human beings and the environment. Exposure with it may cause some hazard diseases including stomach ulcers, liver, vomiting, kidney and nerve tissue damage, cancer in the lungs, and eventually death. The main objective of this study was to evaluate the efficiency of Uio-66 and ZIF-8 in removing chromium from aqueous solutions. For the synthesis of Uio-66 and ZIF-8, hydrothermal and sol-gel methods were used, respectively. The prepared Uio-66 and ZIF-8 were identified by FTIR, XRD, FE-SEM, EDX, and BET. All experiments were done in batch conditions. Uio-66 and ZIF-8 efficiency for chromium adsorption from aqueous solutions were investigated by variables like initial concentration (10-200 mg/l), pH (3 to 11), Uio-66 and ZIF-8 dosage (0.2 to 1 g/l) and contact time (45 min). The FE-SEM image showed that the sizes of Uio-66 crystals were between 140 and 280 nm. The specific surface area and total pore volume of the prepared Uio-66 and ZIF-8 were 800 m/g, 0.45 m/g, 1050 m/g, and 0.57 m/g, respectively. The results show chromium adsorption has increased in acid conditions. Equilibrium dosage for Uio-66 and ZIF-8 was 0.4 g/l and 0.6 g/l, respectively. Adsorption equilibrium was performed after 60 min and after this time, chromium adsorption did not significantly change. The study results showed that the experimental data obtained fitted with kinetic model pseudo-order- reaction and isotherm model of Langmuir.
铬是工业废水中发现的重金属之一，对人类和环境具有高毒性。接触铬可能会引发一些危险疾病，包括胃溃疡、肝脏问题、呕吐、肾脏和神经组织损伤、肺癌，最终导致死亡。本研究的主要目的是评估UiO-66和ZIF-8从水溶液中去除铬的效率。分别采用水热法和溶胶-凝胶法合成UiO-66和ZIF-8。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、能谱分析（EDX）和比表面积分析仪（BET）对制备的UiO-66和ZIF-8进行了鉴定。所有实验均在间歇条件下进行。通过初始浓度（10 - 200mg/L）、pH值（3至11）、UiO-66和ZIF-8用量（0.2至1g/L）以及接触时间（45分钟）等变量研究了UiO-66和ZIF-8从水溶液中吸附铬的效率。FE-SEM图像显示UiO-66晶体尺寸在140至280纳米之间。制备的UiO-66和ZIF-8的比表面积和总孔体积分别为800m²/g、0.45cm³/g、1050m²/g和0.57cm³/g。结果表明，在酸性条件下铬的吸附量增加。UiO-66和ZIF-8的平衡用量分别为0.4g/L和0.6g/L。60分钟后达到吸附平衡，此后铬的吸附量没有显著变化。研究结果表明，获得的实验数据符合准一级反应动力学模型和朗缪尔等温线模型。
