Removal and Recovery of Chromium(VI) from Industrial Waste Water

Singh, Vinay Kumar; Tiwari, Preeti

doi:10.1002/(sici)1097-4660(199707)69:3<376::aid-jctb714>3.0.co;2-f

Cited by 132 publications

(33 citation statements)

References 4 publications

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“…The applicability of Langmuir isotherm in the present system indicates the mono layer coverage of malathion on the outer surface of the adsorbent. Similar results for other adsorbate-adsorbent systems have been reported earlier [24][25][26][27][28].…”

Section: Adsorption Isothermsupporting

confidence: 90%

Removal of Malathion from Aqueous Solutions and Waste Water Using Fly Ash

Singh¹,

Singh²,

Tiwari³

et al. 2010

JWARP

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Fly ash, obtained from a thermal power plant, Anpara, Sonebhadra, India has been used as an effective ad-sorbent for the removal of malathion from aqueous solutions. The time required to attain equilibrium was found to increase from 40 to 60 minutes as the initial malathion concentration increases from 1 to 10 mg/L. The optimum pH value for adsorption was 4.50. The removal of malathion increased by increasing the tem-perature indicating endothermic nature of removal process. The fly ash exhibited first order rate kinetics and followed both Langmuir and Freundlich isotherm models. Endothermic nature of adsorption process was further supported from increasing values of Langmuir and Freundlich constants with increase in temperature. The adsorbent can be used as an economical product for the removal of malathion from wastewater also. A comparison of the adsorption capacity of fly ash with other adsorbents shows that fly ash can be used for the removal of malathion from aqueous solutions

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Section: Adsorption Isothermsupporting

confidence: 90%

Removal of Malathion from Aqueous Solutions and Waste Water Using Fly Ash

Singh¹,

Singh²,

Tiwari³

et al. 2010

JWARP

Self Cite

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“…The modeling of kinetics data aids in the selection of the optimum operating conditions. Lagergren's pseudo‐first order equation is expressed as follows:

\frac{d q_{normalt}}{d t} = k_{1} (q_{normale} - q_{normalt})

where q e and q t are the adsorption capacities at equilibrium and at time t , respectively, and k 1 is the rate constant of the pseudo‐first order adsorption (min −1 ). After integrating and applying boundary conditions, q t = 0 to q t = q t at t = 0 to t = t , the integrated form of Eq.…”

Section: Resultsmentioning

confidence: 99%

Removal of Tartrazine Dye onto Mixed‐Waste Activated Carbon: Kinetic and Thermodynamic Studies

Habila

ALOthman

Rahmat

et al. 2014

CLEAN Soil Air Water

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Numerous studies have been performed on the conversion of individual types of waste into activated carbon (AC). However, this study focused on the evaluation of the simultaneous conversion of different types of wastes (palm, paper, and plastic wastes) into AC via copyrolysis. The tartrazine adsorption capacity onto the produced AC was optimized. The results showed that the carbon content of the AC improved as the calcium hydroxide concentration varied from 0.0 to 2.0 mol L À1 . In addition, the volatile matter and ash content were reduced as the concentration of calcium hydroxide was increased from 0.0 to 2.0 mol L À1 . The tartrazine adsorption capacity of the prepared AC samples increased as the calcium hydroxide concentration increased from 0.5 to 2 mol L À1 at a carbonization temperature of 400°C for 2 h and a final activation temperature of 500°C for 1 h. Effective adsorption occurred at pH 2. The maximum adsorption capacity (74.9 mg g À1 ) was obtained with a contact time of 300 min and an initial tartrazine concentration of 150 ppm. The adsorption kinetics of tartrazine were modeled with pseudo-first order, pseudo-second order, and intraparticle diffusion models, which revealed that the tartrazine adsorption onto the AC showed a best fit with the pseudo-second order kinetic model. The thermodynamic parameters DG 0 , DH 0 , and DS 0 indicated that the adsorption of tartrazine onto the AC was spontaneous and endothermic. The values of DG 0 were between À1.3 and À2.3 kJ mol À1 , and the DH 0 and DS 0 values, in the temperature range of 25-50°C, were 9.12 kJ mol À1 and 35.5 J mol À1 K À1 , respectively. In general, the thermodynamic parameters indicate that the adsorption is spontaneous and endothermic.

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“…Several methods including adsorption, solvent extraction, ion exchange, cementation, have been utilized more often than pyrometallurgical method. 2,3) Among those methods, adsorption is considered as a promising technology because this method uses a simple equipment, and shows low cost, ease operation, and high efficiency even at low metal-ion concentration 4,5,6) . An effective and selective adsorbent should consist of a stable and insoluble porous matrix having suitable active groups (typically organic groups) that interact effectively with gold ion.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Au(III), Cu(II) and Ni(II) on Magnetite Coated with Mercapto Groups Modified Rice Hull Ash Silica

Nuryono¹,

Muliaty²,

Rusdiarso³

et al. 2014

J.I.E.

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Adsorption of Au(III) in multi-metal systems Au/Cu/Ni on mercapto modified silica coated on magnetite (Fe 3 O 4 /SiO 2 -SH) has been studied. Fe 3 O 4 /SiO 2 -SH was synthesized via sol-gel process by using magnetite obtained through co-precipitation of Fe 2+ /Fe 3+ salt mixture with NH 4 OH as the precipitating solution, sodium silicate solution extracted from rice hull ash and 3-mercaptopropyltrimethoxysilane (MPTMS) as the mercapto group source. Fe 3 O 4 /SiO 2 -SH was characterized with Fourier transform infrared (FTIR) spectrophotometer, X-ray diffraction (XRD) and ion chromatography for sulfur analysis. Optimization of Au(III) adsorption in a batch system was carried out as function of pH, contact time and ion concentration. Adsorption kinetics was evaluated with pseudo-first order and pseudo-second order models based on the data of contact time variation, while the adsorption isotherm was studied based on Langmuir and Freundlich models. The adsorbed metal ions Au(III), Cu(II) and Ni(II) quantitatively were calculated based on the difference of metal concentrations before and after adsorption analyzed with flame atomic absorbance spectrophotometer (FAAS). Results of characterization showed that Fe 3 O 4 /SiO 2 -SH has been successfully synthesized. Adsorption of Au(III) on Fe 3 O 4 /SiO 2 -SH slightly decreased with increasing the pH in a range of 2.0-6.0 and fits to pseudo-second order model with the rate constant of 1.37x10 -3 g mg -1 min -1 . Fe 3 O 4 /SiO 2 -SH shows a linear plot of Langmuir isotherm model with adsorption the capacity for Au(III) of 125 mg/g. Adsorption on multimetal systems shows that capacity of Au(III) on Fe 3 O 4 /SiO 2 -SH is higher than that of Cu(II) and Ni(II), and high selectivity for Au(III) toward Cu(II) and Ni(II) ions.

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Removal and Recovery of Chromium(VI) from Industrial Waste Water

Cited by 132 publications

References 4 publications

Removal of Malathion from Aqueous Solutions and Waste Water Using Fly Ash

Removal of Malathion from Aqueous Solutions and Waste Water Using Fly Ash

Removal of Tartrazine Dye onto Mixed‐Waste Activated Carbon: Kinetic and Thermodynamic Studies

Adsorption of Au(III), Cu(II) and Ni(II) on Magnetite Coated with Mercapto Groups Modified Rice Hull Ash Silica

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