Adsorption of Zinc using Tea Factory Waste: Kinetics, Equilibrium and Thermodynamics

Wasewar, Kailas L.; Atif, Mohammad; Prasad, B.; Mishra, Indra Mani

doi:10.1002/clen.200700139

Cited by 58 publications

(42 citation statements)

References 29 publications

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“…Calculations showed that 0.243 of a total adsorption may be explained by the fast process (k 1 = 0.072 s -1 ), and 0.757 of the entire adsorption is contributed to a slow process (k 2 = 3.09 9 10 -3 s -1 ). Figure 1c presents the Weber-Morris plot on which the presence of linear region suggests that intraparticle diffusion might be one of these processes (Wasewar et al 2008;Płaziński and Rudziński 2009). However, the specific cellulose structure, for example, specific surface area\1 sq.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Revision of adsorption models of xyloglucan on microcrystalline cellulose

et al. 2016

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Interactions among cellulose, hemicellulose and pectins are important for plant cell wall assembly and properties and also for industrial applications of these polysaccharides. Therefore, binding of pectin and xyloglucan on microcrystalline cellulose was investigated in this experiment by adsorption isotherms, zeta potential and scanning electron microscopy (SEM). Analysis of three isotherm models (Langmuir, Freundlich and Fowler-Guggenheim isotherms) showed that the experimental adsorption isotherm was well described via the Fowler-Guggenheim model, which includes lateral interaction between the adsorbate. The adsorption isotherm and zeta potential measurement showed that at temperature 25°C only xyloglucan adsorbed on the microcrystalline cellulose. In case of xyloglucan on cellulose, the equilibrium was reached in about 3-4 h, and the kinetics of adsorption were well described by the multiexponential equation. Analysis of the model suggests that two steps can be distinguished: diffusion and reconformation in an adsorbed layer. No adsorption of pectin was observed in this study. SEM study showed that xyloglucan may prevent cellulose from aggregation.

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Section: Adsorption Kineticsmentioning

confidence: 99%

Revision of adsorption models of xyloglucan on microcrystalline cellulose

et al. 2016

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“…Therefore, an inexpensive alternative to activated carbon can greatly increase the application of adsorption based method in various developing countries like Bangladesh. Materials such as tea waste, microbial biomass and straw etc., have already been tested generally as low-cost adsorbent (Aikpokpodion et al 2010;Amarasinghe and Williams 2007;Bhaina and D'Souza 2001;Cay et al 2004;Ingole and Bhole 2003;Kamsonlian et al 2011;Mahavi et al 2005;Wasewar 2010;Wasewar et al 2008). The use of waste materials as inexpensive adsorbent can have several additional advantages.…”

Section: Introductionmentioning

confidence: 99%

“…The use of waste materials as inexpensive adsorbent can have several additional advantages. It is reported in general that tea waste is capable to trap heavy metals due to its highly porous structure with insoluble cell (Aikpokpodion et al 2010;Amarasinghe and Williams 2007;Cay et al 2004;Mahavi et al 2005;Wasewar 2010;Wasewar et al 2008). The functional groups present in tea waste also aid the trapping action.…”

Section: Introductionmentioning

confidence: 99%

Removal of arsenic from contaminated water utilizing tea waste

Hossain

Anjum

Tasnim

2016

Int. J. Environ. Sci. Technol.

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Activated carbon is the adsorbent commonly used to remove arsenic from contaminated water. However, the problem is that it is not always available everywhere and considered expensive in developing countries. An inexpensive alternative to activated carbon can therefore aid the adequate treatment of contaminated water. Tea waste, water hyacinth and banana peel are investigated extensively in this study as the inexpensive alternative. Tea waste treated with a right proportion of aqueous FeCl 3 reagent is found to have substantially higher arsenic removing capacity (which is quantified by arsenic concentrations measured employing Double Beam Atomic Absorption Spectrophotometer) than the other two. The comparison made subsequently between tea waste and activated carbon reveals the feasibility of the utilization of tea waste. The arsenic removing capacity of tea waste treated with the right proportion of aqueous FeCl 3 reagent is found to be equal to that of the activated carbon treated with the same reagent over the continuous operative time of 2 h. The tea waste treated rightly with the same reagent also removes arsenic at acceptable capacities over extended operative times such as 4-6 h. It is therefore proposed to consider tea waste as the inexpensive alternative to activated carbon in treating arsenic contaminated water.

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“…The spectra show a strong band at 3327.0 cm -1 attributed to either -OH or -NH groups [92,93]. But the band appears as two peaks, thus an indicator that it is most likely due to -NH groups [92,93].…”

Section: Resultsmentioning

confidence: 99%

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

Bii¹,

Mwangi²,

Wanjau³

et al. 2016

J Pollut Eff Cont

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The dispersal of toxic heavy metals by water from natural and anthropogenic is a worldwide environmental concern due to pollution. Despite some metals playing an important role in body, they are toxic when the level exceeds the tolerance limits while others such as lead have no known physiological value to human beings. Since heavy metals cannot be degraded, then their removal from drinking water is necessary. Mushrooms are readily available in Bomet County and their metal removal ability was investigated. The study aimed at removing heavy metals from water by adsorption using mushroom, as a cost-effective and sustainable method. The raw mushroom was modified with sodium hydroxide and characterization of both the parent material and its modified form was done using Fourier Transform Infrared spectrometry (FTIR). Sorption experiments were carried out using the batch adsorption method and sorption parameters including pH, contact time, adsorbent dose and initial metal ion concentration investigated. The results found out that the sorption capacity for cadmium ions ranged from 1.826-25.285 mg/g by the unmodified edible mushroom (UEM), the modified edible mushroom (EM), unmodified toxic mushroom (UTM) and modified toxic mushroom (TM). For copper ions, sorption capacity ranged from 0.002-4.097 mg/g, while that of the lead ions ranged from 1.345-2.593 mg/g by the UEM, EM, UTM and TM respectively. The sorption capacity showed improvement on modification as sorption of cadmium increased from 1.826-25.285 mg/g by the UEM, EM, UTM and TM. At a pH range of 4-6, the sorbent material was found to remove up to 90% of the metals. The sorbent material had a removal efficiency of 95% of the metals in less than 20 minutes. The UEM and UTM fitted well in Langmuir adsorption isotherm model for cadmium and lead ions. For copper ions, UEM, EM, UTM and TM fitted in the Freundlich model. TM for lead ions best fitted in the Freundlich model. The bio-sorption kinetics was determined by fitting first-order-Lagergreg and Pseudo-second-order kinetics models to the experimental data. It was found that the data for lead was better described by the pseudo-second-order model. For copper ion, the data was best described by Ho's pseudo second order for UEM and UTM, cadmium ions for all sorbents was best described by Lagergreg's first-order kinetics. The FTIR analysis suggested the possibility of the participation of carboxyl groups in metal uptake. The levels of dissolved organic carbon (DOC) were found to be 19.0 mg/L in the raw material and 2.19 mg/L after modification. It was confirmed that modification minimized secondary pollution. This indicated that mushrooms have a potential application for the remediation of metal polluted waters.

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Adsorption of Zinc using Tea Factory Waste: Kinetics, Equilibrium and Thermodynamics

Cited by 58 publications

References 29 publications

Revision of adsorption models of xyloglucan on microcrystalline cellulose

Revision of adsorption models of xyloglucan on microcrystalline cellulose

Removal of arsenic from contaminated water utilizing tea waste

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

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