Removal of Cadmium and Copper From Aqueous Solutions by Modified Fe3O4 Magnetic Nanoparticles

• Main Authors: Guan-Cheng Ou, 歐冠呈
• Other Authors: Cheng-Hsien Tsai
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/9e2ddp

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 103 === Effluents from many industries contain heavy metals. Heavy metals are not biodegradable and tend to accumulated in the food chain, causing various diseases. For example, effluents from electronic industry contain Cr, Co, Ni, Mo, Ag, In. Magnetic nanoparticles have been widely used to resolve environmental problems, because of their extremely small size, absence of internal diffusion resistance, low cost, high magnetism, and high separation convenience. Fe3O4 magnetic nanoparticles (Fe3O4 MNP) should be a great tool to remediate these pollutants in industrial effluents. Bare Fe3O4 MNP tend to agglomerate into larger agglomerations and then reduce their sorption capacity when the wastewater treatment process. Therefore, the research are to investigate and compare the feasibility of removal of heavy metals from aqueous solution by using naked Fe3O4 MNP, humic acid modified Fe3O4 MNP (Fe3O4/ Humic acid MNP) and sodium citrate modified Fe3O4 MNP (Fe3O4/ Sodium citrate MNP). The SEM, ESEM-EDS and XRD analysis showed that the synthesized Fe3O4 nanoparticles are spherical, solving the agglomeration after modification. The mean specific surface area of the Fe3O4 MNP, Fe3O4/ Humic acid MNP and Fe3O4/ Sodium citrate MNP are 79.4 m2/g, 77.4 m2/g and 56.4 m2/g, respectively. Removal of cadmium and copper aqueous solutions by Fe3O4/ Humic acid MNP conditions are contact time 15 min, room temperature, pH 5 and dosage 5 g/L that the removal efficiency are 99.95% and 99.5% , respectively. Removal of cadmium from aqueous solutions by Fe3O4/ Humic acid MNP dosage 3 and 7 (g/L) that sorption capacity at equilibrium (qe) and rate constant (k2) are 4.84, 3.41 (mg/g) and 0.11, 0.21 (g mg-1 min-1) , respectively. Removal of copper from aqueous solutions by Fe3O4/ Humic acid MNP dosage 3 and 7 (g/L) that sorption capacity at equilibrium (qe) and rate constant (k2) are 3.63, 3.13 (mg/g) and 0.079, 0.16 (g mg-1 min-1) , respectively. The studies on the adsorption of cadmium and copper have shown that the process comply with pseudo-second order kinetic model.