Sorption characteristics of heavy metal ions by aquatic weed

Dixit, Savita; Dhote, Sangeeta; Dubey, Rajat; Vaidya, Harsh Mohan; Das, Rana Jyoti

doi:10.5004/dwt.2010.1406

Cited by 4 publications

(2 citation statements)

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“…Many techniques such as chemical precipitation, electrochemical treatment, ion exchange, filtration, reverse osmosis, and solvent extraction have been employed for treatment of wastewater containing heavy metals [5]. However, most of these conventional techniques are often non-eco-friendly and very costly especially when the heavy metals concentration is in the range of 10-100 mg/L [6,7]. The adsorption of contaminants is adopted as an efficient and promising technique comparable to the current methods in decrease of heavy metals concentrations to acceptable levels.…”

Section: Introductionmentioning

confidence: 99%

“…The utilization of agricultural wastes as sorbent can promote the decrease of environmental problems related to green wastes management and their disposal. A vast variety of green wastes have been evaluated for sorption studies such as rice husk [9], wheat bran [10], corn cobs [11], tree leaves and barks [12], and aquatic weeds [7]. Thousands of tons of wasted black tea are produced and disposed unutilized in tea shops, restaurants, and houses every day.…”

Section: Introductionmentioning

confidence: 99%

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Valorization of Wasted Black Tea as a Low-Cost Adsorbent for Nickel and Zinc Removal from Aqueous Solution

Malakahmad

Tan

Yavari

2016

Journal of Chemistry

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Characteristics and efficiency of wasted black tea (WBT) were investigated as a low-cost sorbent in removal of Ni 2+ and Zn 2+ ions from aqueous solution. Initial findings showed WBT potential to be applied as an effective sorbent due to high concentrations of carbon and calcium and high porosity and availability of functional groups. Sorption dynamics were studied with varying pH, contact time, and adsorbent dose. Maximum percentages of metal ions removal were recorded at pH 5, contact time 250 min, and 20 g/L of adsorbent concentration. Binary metal sorption studies showed that Ni 2+ and Zn 2+ do not compete with each other for available sorption sites, so the adsorption trend in binary system appears similar to monocomponent metal adsorption. Evaluation of the isotherms confirmed that WBT has high value of adsorption capacity. Sorption data fitted well with both Freundlich and Langmuir models. In the optimum conditions, maximum capacity of WBT could reach up to 90.91 mg-Ni/g adsorbent and 166.67 mg-Zn/g adsorbent. This experiment demonstrated the ability of tea waste as an effective, sustainable, and low-cost adsorbent for removal of the heavy metal ions.

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Section: Introductionmentioning

confidence: 99%