In the present work, we studied the impact of adsorption parameters on adsorption of M (II) [Cadmium and Lead] using calcinated chicken egg shell as biomaterial. The characterization of biomaterial reveals; crystallite size by Scherrer formula is 66.58 nm and 9.80 m2/g BET surface area. The adsorption of cadmium and lead on calcinated egg shell was found to be dependent on equilibrium adsorption parameters. The adsorption kinetic models and adsorption isotherm were successfully applied. The removal method was validated with anodic stripping voltametric technique. For standard aqueous sample of M (II), maximum removals were obtained at pH 5 and 200 mg of adsorbent and 120 minutes of contact time. The kinetic model followed pseudo second order kinetics at equilibrium contact time of 120 minute. The amounts of M (II) adsorbed per unit mass of calcinated egg shell increases with initial concentration up to 50 mg/L followed by deviation in results were observed. The Freundlich’s adsorption isotherm model is better fitted for M (II) adsorption with R2 closed to unity i.e0.9998 for Cadmium and 0.9983 for Lead. For real samples, adsorbed M (II) also recovered with 98 + 0.5 % recovery using 10 ml of 1.0 M HCl with flow rate of 2 ml per minute.
Crystallized silver nanoparticles (AgNPs) were synthesized by using the eco-friendly Artocarpus heterophyllus biomaterial. The synthesis of AgNPs was a green approach and a rapid method. The AgNPs were characterized by field-emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy, X-ray diffraction and inductively coupled plasma atomic emission spectroscopy. The FE-SEM analysis showed that the size of the synthesized AgNPs ranged around 45 nm. The plant leaves acted as both a reducing and a capping agent. The synthesized AgNPs showed an absorption peak at 400–440 nm. The biosynthesized AgNPs were tested for their antimicrobial activity against both the gram-positive bacterium Staphylococcus aureus and the gram-negative bacterium Escherichia coli and the fungus Aspergillus niger. The method used in the present work is simple, rapid, single-step, environment-friendly and very cheap and is an alternative to the current physicochemical methods. The antimicrobial activity of biosynthesized AgNPs suggests their possible application in the medical and pharmaceutical industry.
Biosynthesized silver nanoparticle is a very expanding and useful area. The reductant material in the plant extracts (leaves and bark) of Carissa carandas can produce silver nanoparticles. The plant leaves and bark extract of Carissa caranadas act as reducing and capping agent. Conventionally, chemical reduction is the most frequently applied approach for preparation of metallic nanoparticles; however, it might be hazardous to environment. In the present work we report eco-friendly, cost effective, and green approach for the synthesis of AgNPs by using 0.02 M AgNO3 solution and plant extracts (leaves and bark) of Carissa caranadas as reducing and capping agent. The synthesized nanoparticles were characterized using UV-VIS spectrophotomer, XRD, FT-IR, FE-SEM, and ICP-AES analysis. The biosynthesized silver nanoparticles showed a comparable antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Aspergillus niger. Antimicrobial activity of the biosynthesized silver nanoparticles suggests their possible application in medical and pharmaceuticals industry.
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