The treatment of chromium wastewaters using the sorptive potential of leaf mould

Sharma, Divyanshi; Forster, C.F.

doi:10.1016/0960-8524(94)90170-8

Cited by 146 publications

(45 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1), the maximum removal of chromium was 90% for (CAC-S) and for (OS-S) was 82% from a solution 4 mg/L at pH 1.5. There was a sharp decline in percent adsorption with an increase in either pH or concentration of Cr(VI) of the aqueous solution due to the fact that the covalent coordination bonds between Cr (III) ions and the surface functional groups of both activated carbons, such as carboxylic and hydroxyl are very weak in basic conditions (Sharma and Foster, 1994). Maximum adsorption was observed at pH 1.5.…”

Section: Effect Of Initial Phmentioning

confidence: 86%

Adsorption of chromium ion (VI) by acid activated carbon

Attia¹,

Khedr²,

Elkholy³

2010

Braz. J. Chem. Eng.

164

View full text Add to dashboard Cite

-The activated carbon produced from olive stones was chemically activated using sulfuric acid, (OS-S), and utilized as an adsorbent for the removal of Cr(VI) from aqueous solution in the concentration range 4-50 mg/L. Adsorption experiments were carried out in a batch process and various experimental parameters such as effect of contact time, initial chromium ion concentration, carbon dosage, and pH on percentage removal have been studied. Adsorption results obtained for activated carbon (OS-S) were compared with the acid-treated commercial activated carbon (CAC-S). The optimum efficiency shows that the Cr(VI) uptake being attained at pH 1.5. The equilibrium adsorption data was better fitted to the Langmuir adsorption model. The results of kinetic models showed that the pseudo-first-order kinetic model was found to correlate the experimental data well. It was concluded that activated carbon produced from olive stones (OS-S) has an efficient adsorption capacity compared to (CAC-S) sample.

show abstract

Section: Effect Of Initial Phmentioning

confidence: 86%

Adsorption of chromium ion (VI) by acid activated carbon

Attia¹,

Khedr²,

Elkholy³

2010

Braz. J. Chem. Eng.

164

View full text Add to dashboard Cite

show abstract

“…Bio s o rp tio n o f t o xic h eav y metals b y biomaterials has been suggested as a potential alternative to the conventional methods for recovery of toxic heavy metals f ro m w as te w at er [ 1 -2 ] . M an y b io mate r ia ls s u ch asmic ro-algae [3], fungi [4], fungal b io mass [5][6][7], walnut hull [8], almond green hull [9], Helianthus annuus stem waste [10], banana skin, green tea waste, oak leaf, walnut shell, peanut shell and rice husk [11], Ocimum a mericanum L. seed pods [12], chemically modified coir p ith [13], groundnut shell [14], activated carbon from ta marind wood activated with zinc chloride [15], olive stone [16], grape waste [17], hazelnut [18], walnut, hazelnut and almond shell [19], p istachio hull waste [20], agriculture wastes, carbons [21], rice husk-based active carbon [22], fruit shell of gulmohar [23], coconut husk [24], husk of bengal gram [25], eucalyptus bark [26], agricultural waste biomass [27], pine needles [28], sugar cane bagasse [29], leaf mou ld [30] and waste pomace of olive factory [31].…”

Section: Introductionmentioning

confidence: 99%

Biosorption Studies of Cr(VI) Ions from Electroplating Wastewater by Walnut Shell Powder

Farhan¹,

Salem²,

Al-Dujaili³

et al. 2012

AJEE

View full text Add to dashboard Cite

Biosorption of Cr(VI) ions from aqueous solutions and electroplating wastewater by walnut shell powder has been investigated in a batch biosorption process. The biosorption of Cr(VI) ions was found to be dependent pH, initial chromiu m ion concentrations, biosorbent dose, contact time and temperature. The experimental equilib riu m biosorption data were analy zed by Lang muir, Freundlich, and Temkin isotherm models. The Lang muir model gave a better fit than the Freundlich and Temkin models. The ma ximu m biosorption capacity calculated from the Langmu ir isotherm was 138.89 mg/g at optimu m conditions. The kinetic studies indicated that the biosorption process of the chromiu m ions fo llo wed well pseudo-second-order model. The negative values of ∆G o (-3.51 kJ/ mo l) and positive value of ∆H o (12.95 kJ/ mol) revealed that the biosorption process was spontaneous and endothermic. Biosorption process was successfully applied to the treatment of an electroplating wastewater sample, where the concentration of chro miu m (VI) ions, organic materials and COD were effectively reduced. According to the sorption capacity, walnut shell powder considered as an effective, low cost, and environmentally friendly biosorbent for the removal of Cr(VI) ions fro m aqueous solution and electroplating wastewater.

show abstract

“…The utilization of biomaterials even makes adsorption more environmentally friendly, more cost effective, and more technically feasible. A number of adsorbents, such as Casurina leave (Ranganathan 2003), leaf mould (Sarma and Foster 1994), coconut waste (Selvi et al 2001), rubber wood (Raji and Anirudhan 1997), etc. were used for Cr (VI) abatement.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cr (VI) by treated weed Salvinia cucullata: kinetics and mechanism

et al. 2007

View full text Add to dashboard Cite

In the present study a new low cost, easily available and environmentally friendly adsorbent was used for removal of Cr (VI). The Cr (VI) removal efficiency of the adsorbent was studied as a function of contact time, pH, adsorbent dose, adsorbate concentration, temperature and stirring speed. Different adsorption model equations for kinetics, isotherm and rate mechanism of the process were used to find the best model, which fit well to the experimental data. A full factorial design of n k type was used to find a mathematical relation between the percentage of adsorption and variables affecting the adsorption process such as time, pH, adsorbate concentration and temperature. Using the Students 't' test, the significance of each term of the derived equation was tested. The insignificant terms were removed from the derived equation. The adequacy of the equation after removing the insignificant terms was tested using the Fisher adequacy test. From the factorial design analysis it is found that pH has the most pronounced effect followed by time, temperature and the adsorbate concentration. A column study was performed using the optimum operating conditions.

show abstract

The treatment of chromium wastewaters using the sorptive potential of leaf mould

Cited by 146 publications

References 5 publications

Adsorption of chromium ion (VI) by acid activated carbon

Adsorption of chromium ion (VI) by acid activated carbon

Biosorption Studies of Cr(VI) Ions from Electroplating Wastewater by Walnut Shell Powder

Adsorption of Cr (VI) by treated weed Salvinia cucullata: kinetics and mechanism

Contact Info

Product

Resources

About