Removal Of Toxic Pb Research Articles

A high-performance fluorescent hybrid material for fluorometric detection and removal of toxic Pb(ii) ions from aqueous media: performance and challenges.

Lead(ii) is an extremely toxic heavy metal ion that causes various health problems that are difficult to recover from in many developing countries of the world. Fluorescence-based nanosensors have amazing characteristics such as high sensitivity/selectivity, portability, low detection limit, rapid on-site usability, low cost and capability for removal of heavy metal ions. In this paper, a new fluorescent hybrid material based on silica gel (Bodipy-Si) was developed via a click reaction between alkyne-terminal silica gel and azido-terminal Bodipy. The solid support surface was characterized by various techniques such as SEM, FT-IR, etc. The adsorption and fluorometric properties of the fluorescent nanoparticles were also examined using atomic absorption and fluorescence spectroscopies, and in the presence of metal ions, respectively. The results indicated that the prepared hybrid-fluorescent nanoparticles can be used in the removal and detection of toxic Pb(ii) ions. The limit of detection (LOD) was determined from the fluorescence data as 1.55 × 10-7 M and the maximum adsorption capacity was examined by AAS. The complexometric interactions between Pb(ii) and Bodipy-Si affect the adsorptions of the Pb(ii) metal ion at various concentrations.

Sustainable synthetic approach and applications of ZnO/r-GO in the adsorption of toxic Pb2+ and Cr6+ ions

Highlights • Tectona grandis leaves extract based synthesis of ZnO NPs. • Sono-chemical preparation of ZnO/r-GO and its characterisation using several analytical methods. • Utilisation of ZnO/r-GO in the removal of toxic Pb 2+ and Cr 6+ ions from contaminated water via adsorption. • Isothermal and kinetic studies. The current work presents a sustainable method for the synthesis of ZnO/r-GO material using Tectona grandis leaf extract. Leaf extract was used to synthesise ZnO nanoparticles (ZnO NPs). To synthesise ZnO/r-GO, reduced graphene oxide (r-GO) and ZnO NPs were incorporated under ultrasonic conditions. The characteristic bonds onto ZnO/r-GO were identified as O H, C O, C-Zn, Zn-O, and others. The ZnO/r-GO was analysed using several analytical methods and has been used to eliminate hazardous Pb 2+ and Cr 6+ ions from contaminated water via adsorption. Maximum decontamination has been achieved through optimization. The removal of 68.3 and 60.9 % at 60 min, 67.9 and 63.9 % at 100 mg dosage, and 98 and 88.5 % at optimal pH was recorded for Pb 2+ and Cr 6+ ions. The adsorption equilibrium findings were validated using various isotherm and kinetic models. Pb 2+ and Cr 6+ had the highest adsorption capacities of 16.261 and 10.718 mg/g, respectively. The pseudo second order rate constants (k 2 ) were found to be 2.738 and 3.415 g/mg/min for Pb 2+ and Cr 6+ ions. The regeneration study also revealed the potential of the ZnO/r-GO and, after the first cycle, the % removal has been found to be 77.9 and 73.2 % for Pb 2+ and Cr 6+ ions, respectively.