چكيده به لاتين
Water pollution that is caused by various heavy metal ions especially lead and mercury, is considered as a universal challenge for public health. Today, several methods are applied to purify wastewater including chemical precipitation, ion exchange, membrane filtration and adsorption process. Different kinds of adsorbent have been used for heavy metal ions removal from water. Recently, researchers have been attracted to the porous nanostructures such as Metal Organic Frameworks (MOFs) because of their grate pores volume, large surface area, selectivity and so on. In this study, three Metal Organic Frameworks (MOFs), namely Zn-HKUST-1, Cu-HKUST-1 and PCN-221, were prepared. Zn-HKUST-1 and Cu-HKUST-1 were designed with benzene 1,3,5-tricarboxylic acid linker and PCN-221 framework was constructed by porphyrin linker, leading to rapid, efficient and selective removal of various heavy metal ions like Pb2+ and Hg2+ from wastewater. Adsorption capacity were obtained up to 333 and 312 mg/g for Pb2+ by Cu-BTC and Zn-BTC, respectively, and 277 mg/g for Hg2+ by PCN-221 during 30 min. Moreover, adsorption of Pb2+ and Hg2+ were fitted with Langmuir model and experimental kinetic data were followed pseudo-second-order model well. This work exhibits two BTC- and a porphyrin-based MOFs to remove Pb2+ and Hg2+ from pollutant water in less than 30 min effectively.
