Removal of phosphate from aqueous solutions using calcined metal hydroxides sludge waste generated from electrocoagulation

Golder, Animes Kumar; Samanta, Amar Nath; Ray, Subhabrata

doi:10.1016/j.seppur.2006.03.027

Cited by 112 publications

(54 citation statements)

References 25 publications

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“…The 1,476.6/cm peak indicates the bent vibration of H-O-H. Absorption band at 3,696.4/cm implies the transformation from free protons into a proton conductive state in brucite. The strong peak at 439.2/cm is assigned to the Mg-O stretching vibration (Golder et al 2006;Vasudevan et al 2010). The spectrum data are in good agreement with the reported data (Golder et al 2006).…”

Section: Characterization Of the Anode Surfacesupporting

confidence: 90%

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Removal of lead from aqueous solutions by electrocoagulation: isotherm, kinetics and thermodynamic studies

Kamaraj

Ganesan

Vasudevan

2013

Int. J. Environ. Sci. Technol.

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The present study provides an electrocoagulation process for the removal of lead from water using magnesium and galvanized iron as anode and cathode, respectively. The various operating parameters such as the effect of initial pH, current density, electrode configuration, inter-electrode distance, co-existing ions and temperature on the removal efficiency of lead were studied. The results showed that the maximum removal efficiency of 99.3 % at a pH of 7.0 was achieved at a current density 0.8 A/dm 2 with an energy consumption of 0.72 kWh/m 3 . The experimental data were fitted with several adsorption isotherm models to describe the electrocoagulation process. The adsorption of lead preferably fitting the Langmuir adsorption isotherm suggests monolayer coverage of adsorbed molecules. In addition, the adsorption kinetic studies showed that the electrocoagulation process was best described using the second-order kinetic model at various current densities. Thermodynamic parameters, including the Gibbs free energy, enthalpy and entropy, indicated that the lead adsorption of water on magnesium hydroxides was feasible, spontaneous and endothermic.

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Section: Characterization Of the Anode Surfacesupporting

confidence: 90%

“…The strong peak at 439.2/cm is assigned to the Mg-O stretching vibration (Golder et al 2006;Vasudevan et al 2010). The spectrum data are in good agreement with the reported data (Golder et al 2006). Mg-Pb is observed in -OH stretching region.…”

Section: Characterization Of the Anode Surfacesupporting

confidence: 90%

Removal of lead from aqueous solutions by electrocoagulation: isotherm, kinetics and thermodynamic studies

Kamaraj

Ganesan

Vasudevan

2013

Int. J. Environ. Sci. Technol.

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“…Though a high correlation coefficient (R 2 > 0.9) is obtained in each model, the phosphate adsorption in the present study most closely followed pseudo-second-order kinetics, by which a very accurate estimation of q e is achieved as well as the highest correlation coefficient (R 2 > 0.99) ( Table 3). Comparable results were observed in phosphate adsorption onto ZnCl 2 activated coir pith carbon [31], calcined electrocoagulated metal hydroxides sludge [32], amorphous zirconium hydroxide [14] and dolomite [33].…”

Section: Adsorption Kineticsmentioning

confidence: 77%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

197

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a b s t r a c tA series of layered double hydroxides (LDHs) with different metal cations were synthesized to remove phosphate in waste sludge filtrate from a municipal wastewater treatment plant for phosphorus recovery and to help control eutrophication. The highest phosphate adsorption capacity was obtained by using Zn-Al-2-300, that is LDHs with Zn/Al molar ratio of 2 and calcined at 300 • C for 4 h. Circumneutral and mildly alkaline waters appeared suitable for the possible application of Zn-Al LDHs due to the amphoteric nature of aluminum hydroxide. Phosphate adsorption from the sludge filtrate by the LDHs followed pseudo-second-order kinetics, and the adsorption capacity at equilibrium was determined to be ∼50 mg P/g. Adsorption isotherms showed that phosphate uptake in this study was an endothermic process and had a good fit with a Langmuir-type model. The absorbed phosphate can be effectively desorbed (more than 80%) from LDHs particles by a 5 wt% NaOH solution. The regeneration rate of used LDHs was ∼60% after six cycles of adsorption-desorption-regeneration.

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“…5,6 Vários processos têm sido desenvolvidos para a remoção de íons fosfato de efluentes, incluindo a precipitação química, a remoção biológica de fósforo, a cristalização, a adsorção e a troca iônica.…”

Section: Introductionunclassified

“…[1][2][3][4] O excesso de íons fosfato em efluentes também causa a acidificação e a degradação dos corpos de água, devido à alta demanda biológica de oxigênio, destruindo a vida aquática. 5,6 Vários processos têm sido desenvolvidos para a remoção de íons fosfato de efluentes, incluindo a precipitação química, a remoção biológica de fósforo, a cristalização, a adsorção e a troca iônica.…”

Section: Introductionunclassified

Adsorção de íons fosfato em óxido de nióbio hidratado

Rodrigues¹,

Silva²

2009

Quím. Nova

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Recebido em 11/6/08; aceito em 9/12/08; publicado na web em 11/5/09 ADSORPTION OF PHOSPHATE IONS ON HYDROUS NIOBIUM OXIDE. The adsorption kinetics of phosphate on Nb 2 O 5 .nH 2 O was investigated at initial phosphate concentrations 0.25, 0.50 and 1.00 mg.L -1. The kinetic process was described by a pseudo-secondorder rate model very well. The adsorption thermodynamics was carried out at 298, 308, 318, 328 and 338 K. The positive values of both ∆H and ∆S suggest an endothermic reaction and increase in randomness at the solid-liquid interface during the adsorption. ∆G values obtained were negative indicating a spontaneous adsorption process. The Langmuir model described the data better than the Freundlich isotherm model. The effective desorption could be achieved using water at pH 12.Keywords: adsorption of phosphate ions; kinetics models; Langmuir. INTRODUÇÃOA remoção de íons fosfato de efluentes industriais é de grande interesse devido à quantidade de material processado. As indústrias de fertilizantes, detergentes e pigmentos são as que mais produzem efluentes com este ânion originário de seus processos.Embora seja um nutriente essencial, quando em excesso promove o crescimento de macro e microorganismos aquáticos que se transformam na principal causa da eutrofização dos corpos de água receptores.1-4 O excesso de íons fosfato em efluentes também causa a acidificação e a degradação dos corpos de água, devido à alta demanda biológica de oxigênio, destruindo a vida aquática. 5,6 Vários processos têm sido desenvolvidos para a remoção de íons fosfato de efluentes, incluindo a precipitação química, a remoção biológica de fósforo, a cristalização, a adsorção e a troca iônica.O método mais utilizado atualmente é a precipitação química. 7,8 Contudo, essa técnica tradicional está sujeita a custos elevados, problemas de manipulação do precipitado e neutralização do efluente, além de ser inadequada para a descontaminação de efluentes contendo íons em baixas concentrações. 3,9 Com isso, têm-se investigado mé-todos alternativos como, por exemplo, eletrodiálise, osmose reversa, ultrafiltração e adsorção. 3,8 Alguns métodos físicos apresentam-se muito caros, como no caso da osmose reversa e eletrodiálise, ou ineficiente, removendo apenas cerca de 10% do total de íons fosfato.O tratamento biológico pode remover mais que 97% do total de íons fosfato, mas este processo pode ser variável devido às dificuldades operacionais encontradas. As grandes vantagens da adsorção sobre as outras técnicas são a possibilidade de regeneração dos adsorventes e a aplicação de materiais de baixo custo no tratamento de efluentes. 8,10,11 Nos últimos anos, vários adsorventes foram desenvolvidos para a remoção de íons fosfato, tais como hidróxidos duplos lamelares, óxidos hidratados, lama vermelha, dolomita, sulfato de alumínio, hidróxidos metálicos, materiais híbridos, goethite e outros tipos de solos. 7,9,[12][13][14][15][16][17][18][19][20][21][22][23][24] Dentre estes materiais, os óxidos metálicos são materiais promissores para a remoção desse í...

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Removal of phosphate from aqueous solutions using calcined metal hydroxides sludge waste generated from electrocoagulation

Cited by 112 publications

References 25 publications

Removal of lead from aqueous solutions by electrocoagulation: isotherm, kinetics and thermodynamic studies

Removal of lead from aqueous solutions by electrocoagulation: isotherm, kinetics and thermodynamic studies

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Adsorção de íons fosfato em óxido de nióbio hidratado

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