جستجوی مقالات مرتبط با کلیدواژه « zinc metal » در نشریات گروه « محیط زیست »

Heavy metals cases are threatening the health of ecosystems. Accumulation of metals in the soil allows them to plant crops and thus increases the risk of agriculture crops health. The goal of this research was conducted to evaluate zinc stress resistance for Pharagmites australis in greenhouse conditions.

Experimental design was performed in an entirely randomized plan having two factors and three replications, 2016 at University of Jiroft. Digestion and preparation of samples were done by dry burning method and then Zinc concentration was measured by atomic absorption.

Greenhouse experiments results showed that with increasing in metal concentration treatments, its absorbing with shoot and root were increased. However, impressive accumulation of zinc was in root and its translocation and accumulation in shoot has been reported much less.

With absorb and accumulate of metals in root, ability of plant growth was decreased with changes in physiological characteristics. Results of regression analysis showed concentration increasing of zinc in P. australis organs under these metal stress condition were fitted as a quadratic function with R2 >90 (p<0.01). In summary results of this research show high relatively resistant of P. australis to zinc stress as necessary metal in plants, high accumulation capacity for metal in its root organ and low heavy metal translocation factor.

Water pollution with heavy metals is one of the most important environmental problems that affect human life and health by causing serious diseases. Therefore, it is necessary to control their presence in the environment. Despite the high use of zinc in industry and the pollution of water resources by effluents containing it and the problems caused 0062002y the presence of this metal in drinking water, a study on the use of chitosan nanoparticles taken from the waste of fish breeding workshops and Shrimp has not been done to optimally remove this metal from water sources.

Here, a nanocomposite of chitosan and graphene oxide was synthesized at the University of Jiroft in 2019 and used for removal of zinc metal from industrial wastes. The effects of initial solution pH (2-7), chitosan/graphene oxide bio-sorbent dose (0-1.5 g/l), initial zinc (II) concentration (10-200 mg/l) and contact time on the uptake capacity of metal (30- 420 min) were investigated.

This nanocomposite was exhibited the highest metal ions uptake capacity (89.2 mg/g) at pH value of 4.0, biomass dose 0.01 g/l, metal concentration of 200 mg/l and contact time 420 min. The structural stability and efficient adsorption capacity of adsorbent was proved after four times adsorption–desorption cycles and after that uptake capacity was 19.35 mg/g.

The results showed that the synthesized nanocomposite from chitosan and graphene oxide could be used as a potentially good adsorbent to remove Zn2+ simultaneously in aqueous solutions.