Biosorption of hexavalent chromium by chemically modified seaweed, Cystoseira indica

Basha, Shaik; Murthy, Z.V.P.; Jha, Bhavanath

doi:10.1016/j.cej.2007.04.038

Cited by 147 publications

(81 citation statements)

References 53 publications

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“…they are in a state of dynamic equilibrium; hence an indication of the maximum adsorption capacity of the adsorbent at the experimental conditions [19]. A similar trend has been reported in literature [20]. …”

Section: Effect Of Contact Timesupporting

confidence: 69%

Fly ash: An alternative to powdered activated carbon for the removal of eosin dye from aqueous solutions

Bello¹,

Olusegun²,

Njoku³

2013

Bull. Chem. Soc. Eth.

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ABSTRACT. This paper reports the use of powdered activated carbon (PAC) and raw coal fly ash (RFA) in the removal of eosin dye from aqueous solution in batch processes. Operational parameters such as contact time, initial dye concentration, pH and temperature were investigated. Adsorption equilibrium was established in 120 min for the two adsorbents. Langmuir and Freundlich isotherms were used to fit the adsorption data. Langmuir model gave the best fit in both cases. The adsorption capacities of PAC and RFA were found to be 62.28 mg/g and 43.48 mg/g, respectively. The highest percentage of eosin dye removal for both PAC (98%) and RFA (90%) was observed at pH 2. Pseudo first-order and pseudo second-order kinetic models were used to fit the adsorption data. Pseudo second-order kinetic model gave the best description of the adsorption of eosin dye onto the two adsorbents. Thermodynamic parameters, ∆H 0 , ∆S 0 and ∆G 0 confirmed the physical nature, spontaneity and the endothermic nature of the adsorption process. A regeneration technique and a process calculation for evaluating the adsorbent dose required were carried out. This study has shown that RFA is a good alternative adsorbent in the removal of eosin dye from aqueous solution.

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Section: Effect Of Contact Timesupporting

confidence: 69%

Fly ash: An alternative to powdered activated carbon for the removal of eosin dye from aqueous solutions

Bello¹,

Olusegun²,

Njoku³

2013

Bull. Chem. Soc. Eth.

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“…Figure 1 showed a rapid removal of 65% at 15 min and remained almost constant to 80 -85 % with minute fluctuations. It was attributed the fact that initially all functional groups on biosorbent were vacant and solute concentration was high [8]. However, after 1 hour, very few active sites were left on algal cell wall.…”

Section: Resultsmentioning

confidence: 99%

Effect of acidic and basic pretreatment of wild algal biomass on Cr (VI) biosorption

Singh¹,

Dixit²,

Sundaram³

2014

IOSRJESTFT

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“…Simple, easy to prepare and use, hazard free and environment friendly treatments are the requirement for sustainable preparation of bioadsorbent. Considering the above this research is used simple and non-treated preparation methods rather than the expensive and high-tech pyrolysis and non-environment friendly acid/base pre-treatment methods [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. This is the novelty of this study.…”

Section: Environment Friendly Preparationmentioning

confidence: 99%

“…Huge and abandoned agro-wastes may be the potential sources for producing bioadsorbents besides the high cost adsorbents for heavy metals removal. Different bioadsorbents are developed from agro-wastes and used for heavy metals removal such as rice straw [7], seaweed [8], wood and bark [9], tea-waste [10], maize corn cob, jatropha oil cake, sugarcane bagasse [11], tamarind hull [12], sawdust [13], rice husk [14], saltbush [15], marine algal biomass [16], olive pomace [17], activated sludge [18], sugar beet pulp [19], wool, olive cake, sawdust, pine needles, almond shells, cactus leaves, and charcoal [20], seafood processing waste sludge [21] and pine bark [22]. Bioadsorbents which produced from agro-wastes may act as a significant material for copper adsorption.…”

Section: Introductionmentioning

confidence: 99%

Removal of Copper from Water by Adsorption onto Banana Peel as Bioadsorbent

Hossain¹

2012

geomate

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Banana peel, a fruit waste were used to produce bioadsorbent through environment friendly process. It were cut, washed, dried, grounded into powder and used for copper removal. Copper adsorption onto banana peel was depended upon the controlling parameters such as particle size, doses, pH, contact time, agitation speed and temperature. Slightly acidic water (pH = 6) was found to be suitable for copper removal. Equilibrium data were well fitted (R 2 = 0.998) with the Langmuir and Freundlich isotherms. The monolayer adsorption capacity was 27.78 mg/g. The calculated R L and 'n' values has proved the favorability of copper adsorption onto banana peel. Copper adsorption was followed the second order kinetic properly rather than other models. The equilibrium adsorption capacity was 1. 439, 8.849, 18.182, 31.250 and 71.429 mg/g when initial copper concentrations were 10, 50, 100, 200, and 400 mg/l respectively. Solvent 0.1N Sulphuric acid showed higher desorption of copper (94%) and adsorption-desorption process can be continued till seven cycles efficiently.

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Biosorption of hexavalent chromium by chemically modified seaweed, Cystoseira indica

Cited by 147 publications

References 53 publications

Fly ash: An alternative to powdered activated carbon for the removal of eosin dye from aqueous solutions

Fly ash: An alternative to powdered activated carbon for the removal of eosin dye from aqueous solutions

Effect of acidic and basic pretreatment of wild algal biomass on Cr (VI) biosorption

Removal of Copper from Water by Adsorption onto Banana Peel as Bioadsorbent

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