Green Tea Leaves as a Natural Adsorbent for the Removal of Cr(VI) from Aqueous Solutions

Jeyaseelan, Christine; Gupta, Astha

doi:10.4137/aswr.s35227

Cited by 41 publications

(21 citation statements)

References 16 publications

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“…However, it was determined that similar percentage removal results were achieved for the Pb and Cd ions at certain contact times and that there was no statistical difference between the results (p > 0.01). Similar findings have been reported in the removal of heavy metal ions by tea wastes 42 . In addition, some studies in the literature have reported similar results for heavy metals using different agricultural wastes 43,44 .…”

Section: Effect Of Btw Amount On the Adsorption Efficiencysupporting

confidence: 90%

Adsorption capability of brewed tea waste in waters containing toxic lead(II), cadmium (II), nickel (II), and zinc(II) heavy metal ions

Çelebi

Gök

2020

Sci Rep

154

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Recently, the search for low-cost eco-friendly adsorbents has become one of the main objectives of researchers. The aim of this study was to test the removal of four heavy metals, namely lead (Pb), zinc (Zn), nickel (Ni) and cadmium (Cd), from a simulated watery solution using brewed tea waste as a potentially suitable adsorbent. The effects of pH levels (2.0–6.0), adsorbent amount (0.1–5.0 g), contact times (1–150 min.) were examined throughout the adsorption process. The results of the experiments showed that the heavy metals elimination yields had an inverse relationship with pH and a linear relationship between the other parameters. The optimum pH for the removal of the heavy metals was between 4.0 and 5.0 in the case of the brewed tea waste. Equilibrium times of 2, 10, 30 and 5 min were required for the adsorption of Pb, Zn, Ni, Cd onto Camellia sinensis, respectively. Based on the results of this study it can be said that brewed tea waste has a high potential to remove heavy metals from aqueous solutions. The maximum adsorption capacities were calculated as 1.197, 1.457, 1.163 and 2.468 mg/g, for Pb, Zn, Ni and Cd, respectively, by fitting the equilibrium data to the Langmuir isotherm model.

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Section: Effect Of Btw Amount On the Adsorption Efficiencysupporting

confidence: 90%

Adsorption capability of brewed tea waste in waters containing toxic lead(II), cadmium (II), nickel (II), and zinc(II) heavy metal ions

Çelebi

Gök

2020

Sci Rep

154

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“…optimum percentage removal of 99% ± 1%) at around 0.5 g of the adsorbent. Jeyaseelan and Gupta [8] observed similar results with the removal efficiency reaching a constant value at 0.8 g/50 ml adsorbent dosage of green tea leaves of Camellia sinensis plant species. The results obtained obviously follow such a trend due to more adsorption sites being available with the as amount of adsorbent increases.…”

Section: Effect Of Adsorbent Dosagesupporting

confidence: 57%

“…The results obtained obviously follow such a trend due to more adsorption sites being available with the as amount of adsorbent increases. Since adsorption sites adsorbent particles increase, it would be more probable for CrO − ions to be adsorbed and thus adsorption efficiency should also increase as stated articulated by Bansal et al, [8]. In this particular case, the concentration of the Cr(VI) ions is constant and therefore increasing the adsorbent dosage increases the available adsorption surface area.…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 89%

“…However, Freundlich isotherm model shows a better agreement with the equilibrium data. Cooked tea dust 30.39 25 -125 2 [19] Camellia sinensis green tea leaves 34.59 5 -500 2 [8] The characterization of the surface of the green Moringa tea leaves biomass by some analytical techniques such as infrared spectroscopy, scanning electron microscopy (SEM), BET surface area, and surface charge by measuring zeta potential may have provided more insight the adsorption mechanism of Cr(VI).…”

Section: Discussionmentioning

confidence: 99%

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Adsorptive Removal from Aqueous Solution of Cr(VI) by Green Moringa Tea Leaves Biomass

Timbo¹,

Kandawa‐Schulz²,

Amuanyena³

et al. 2017

JEAS

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Hexavalent chromium, Cr(VI), is a toxic metal present in industrial effluents. The study was carried to test the use of green Moringa leaves biomass as adsorbent for Cr(VI) from aqueous solutions. Batch adsorption method was used and the concentration of Cr(VI) measured using an ultraviolet-visible (UV-Vis) spectrophotometry. The effects of the adsorption contact time, adsorbent dosage, pH, initial adsorbate concentration and temperature were studied. Results show maximum removal of Cr(VI) of 99% ± 1%, with maximum adsorption capacity of 33.9 mg/g at a pH 2, 60 minutes contact time and 100 mg/l initial Cr(IV) concentration. The Langmuir and Freundlich adsorption isotherm models were used to fit the experimental data. The data showed that adsorption on green Moringa oleifera leaves tea biomass fitted well to Freundlich isotherm (r 2 = 0.9432) compared to the Langmuir isotherm (r 2 = 0.9122). M. oleifera leaves biomass can be used in water purification systems. The sludge of M. oleifera leaves is biodegradable, cost effective and environmentally friendly and therefore attractive in hexavalent chromium removal in water.

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“…Even small amounts of Cr(VI) compounds can be harmful to human health [ 13 ]. Contact with Cr-containing materials often results in allergic reactions [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Successful Outcome of Phytostabilization in Cr(VI) Contaminated Soils Amended with Alkalizing Additives

Radziemska

Bęś

Gusiatin

et al. 2020

IJERPH

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This study analysed the effect of three alkalizing soil amendments (limestone, dolomite chalcedonite) on aided phytostabilization with Festuca rubra L. depending on the hexavalent chromium (Cr(VI)) level in contaminated soil. Four different levels of Cr(VI) were added to the soil (0, 50, 100 and 150 mg/kg). The Cr contents in the plant roots and above-ground parts and the soil (total and extracted Cr by 0.01 M CaCl2) were determined with flame atomic absorption spectrometry. The phytotoxicity of the soil was also determined. Soil amended with chalcedonite significantly increased F. rubra biomass. Chalcedonite and limestone favored a considerable accumulation of Cr in the roots. The application of dolomite and limestone to soil contaminated with Cr(VI) contributed to a significant increase in pH values and was found to be the most effective in reducing total Cr and CaCl2-extracted Cr contents from the soil. F. rubra in combination with a chalcedonite amendment appears to be a promising solution for phytostabilization of Cr(VI)-contaminated areas. The use of this model can contribute to reducing human exposure to Cr(VI) and its associated health risks.

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Green Tea Leaves as a Natural Adsorbent for the Removal of Cr(VI) from Aqueous Solutions

Cited by 41 publications

References 16 publications

Adsorption capability of brewed tea waste in waters containing toxic lead(II), cadmium (II), nickel (II), and zinc(II) heavy metal ions

Adsorption capability of brewed tea waste in waters containing toxic lead(II), cadmium (II), nickel (II), and zinc(II) heavy metal ions

Adsorptive Removal from Aqueous Solution of Cr(VI) by Green Moringa Tea Leaves Biomass

Successful Outcome of Phytostabilization in Cr(VI) Contaminated Soils Amended with Alkalizing Additives

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