Abstract
Aromatic hydrocarbons are toxic pollutants that enter into environment through various industries. These pollutants are carcinogenic and cause genetic mutations. There are various solutions, including biological methods, extraction, and electrocoagulation. This research aims to synthesize the nano zero-valent iron (nZVI) from the ferrous waste and granules of nZVI by the chemical combination of nZVI with polyvinyl alcohol (PVA). The performance of these two adsorbents was evaluated to degradation of phenol from an aqueous solution. The physical properties of the synthesized nanoparticles were determined using SEM analysis. Effect of pH, contact time, contaminant concentration, and adsorbent dosage on the removal efficiency were studied. The results showed that the maximum removal efficiency of phenol by nZVI and GnZVI was 78, 57.83 %, respectively, at the condition of pH 3, 60 minutes initial concentration of 8 ppm and adsorbent dosage of 2.5 g. The removal efficiency of phenol in acidic conditions and laboratory temperature by adsorption of nZVI is higher than GnZVI with a difference in removal efficiency of approximately 20 %. Equilibrium isotherms were analyzed by Langmuir and Freundlich equations and it was observed that these experiments followed Freundlich model.
Highlights
Cyclic hydrocarbons are organic compounds composed of carbon and hydrogen atoms that form rings or cyclic structures by bonding together
Phenol has a higher removal efficiency in contact with adsorbents at acidic pHs, which can be attributed to the lack of iron hydroxide formatio n in acidic environments, which means that adsorbent surfaces have a better ability to trap phenol
The results of this study show that the adsorption process with adsorbents produced from the waste is a good way to remove phenol
Summary
Cyclic hydrocarbons are organic compounds composed of carbon and hydrogen atoms that form rings or cyclic structures by bonding together. The removal efficiency for phenol in contaminated industrial wastewater for the natural asorbrnts of almond peel and walnut charcoal were 85.54 and 65.49%, respectively [13]. The synthesis of the nano zero-valent iron (nZVI) and granular nano zero-valent iron (GnZVI) fro m the iron waste of the steel plant and the performance of two adsorbents on the degradation of phenol as an aromatic hydrocarbon from the aqueous medium were investigated. Calculated using the slope of the line and the width of the origin from the equation of line Log qe versus Log Ce. qe is the amount of adsorption of phenol on the adsorbent (mg/g), Ce is the equilibrium concentration of solute in the initial solution(mg/L). The Langmuir parameters are calculated using the slope of the line and the width of the origin from the equation of the line Ce versus Ce/qe [24]
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