Preliminary Studies of Methylene Blue Remotion from Aqueous Solutions by Ocimum basilicum

Khalid Hashim,Magomed Muradov,Haneen A K Karaghool,Patryk Kot

doi:10.3390/environments9020017

Khalid Hashim, Magomed Muradov + Show 2 more

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https://doi.org/10.3390/environments9020017

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Abstract

The continuous expansion in the textile industry results in high loads of coloured wastewaters that heavily pollute the limited freshwater sources. Therefore, a wide array of treatment methods has been used to remediate water/wastewater from dyes. One common practice is the use of plants to degrade, absorb, metabolise, and detoxify different types of pollutants, including dyes. This study employs sweet basil (Ocimum basilicum) as a phytoremediation model herb to remove different concentrations (5–25 mg/L) of methylene blue (MB) dye from synthetic water, taking into account the effects of the MB dye concentration (5–25 mg/L) and contact time (up to 10 days). The results showed that the ability of Ocimum basilicum to absorb MB dye decreased with the increase of the MB dye concentration and increased with the increase of the contact time. The best removal of the MB dye was 93% when the concentration of the MB dye was 25 mg/L and the contact time was 10 days. Additionally, it was noticed that the relative growth rate (RGR) of the herbs was adversely influenced by increasing MB dye concentrations and that the best RGR value was 2.2 g/day when the MB dye concentration was 5 mg/L.

Highlights

Various industrial sectors are increasingly employing various dyes, resulting in the buildup of hazardous chemicals in the environment [1]
It was noticed that the relative growth rate (RGR) of the herbs was adversely influenced by increasing methylene blue (MB) dye concentrations and that the best RGR value was 2.2 g/day when the MB dye concentration was 5 mg/L
This study aims to assess the bioremoval of MB by sweet basil (Ocimum basilicum) using the phytoremediation concept

Summary

Introduction

Various industrial sectors are increasingly employing various dyes, resulting in the buildup of hazardous chemicals in the environment [1]. Dyes are used in a variety of sectors, including textiles, plastics, paper, concrete, pharmaceuticals, and rubber [2]. The textile sector is thought to be responsible for more than 50% of dye wastewater [3]. The production of dye metabolites and the presence of heavy metals within the dye structure are both responsible for toxicity in textile effluents [4]. Dyes are considered dangerous because of their toxic characteristics, including carcinogenic, allergic, and dermal impacts. In addition to the toxicological considerations, the most serious environmental adverse impact with dyes is the restriction of sunlight penetration into surface waters, which inhibits the growth of microorganisms (phytoplankton or/and cyanobacteria) and submerged aquatic plants, resulting in oxygen depletion in the water [5]

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