Coadsorption of Cd(II) and oxalate ions at the TiO2/electrolyte solution interface

Janusz, W.; Matysek, M.

doi:10.1016/j.jcis.2005.08.067

Cited by 39 publications

(27 citation statements)

References 16 publications

(17 reference statements)

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“…Recently, TiO 2 has been used to remove heavy metals by means of adsorption. Previous studies on the adsorption of heavy metal ions demonstrated that TiO 2 could adsorb heavy metal ions including Cd (10), Cu (11), Pb (12), Ag (13), and Zn (14). The removal efficiency of Cu 2þ cations was 88% when the adsorption conditions were pH 6, TiO 2 concentration 5.5 g L À1 , initial Cu 2þ concentration 10 g L À1 , temperature 313 K, and contact time 20 h, respectively.…”

Section: Introductionmentioning

confidence: 94%

Adsorption of Cu²⁺Cations from Aqueous Solution by S-doped TiO₂

Wang

Wan

et al. 2011

Separation Science and Technology

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S-doped TiO 2 as a novel adsorbent for Cu 2þ cations removal from aqueous solutions was synthesized by simple sol-gel process. Removal of Cu 2þ cations from aqueous solutions was investigated with particular reference to the effects of initial Cu 2þ cations concentration, pH-value, adsorbent dosage, and temperature on adsorption. It was found that the maximum adsorption capacity was 96.35 mg g À1 at 328 K. The adsorption equilibrium isotherms and the kinetic data were well described by the Langmuir and pseudo-second-order kinetic models, respectively. The high uptake capability of S-doped TiO 2 makes it a potentially attractive adsorbent for the removal of heavy metal pollutants from aqueous solution.

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Section: Introductionmentioning

confidence: 94%

Adsorption of Cu²⁺Cations from Aqueous Solution by S-doped TiO₂

Wang

Wan

et al. 2011

Separation Science and Technology

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“…This pH decrease can be attributed to surface complexation reactions of As(III) and Cd that resulted in the net release of one and two protons, respectively. The surface complexation reactions evidenced by EXAFS studies are descried as follows Janusz and Matysek, 2006;Pena et al, 2006;Randall et al, 1999):…”

Section: 2mentioning

confidence: 99%

Simultaneous As(III) and Cd removal from copper smelting wastewater using granular TiO2 columns

Huang

Cui

et al. 2015

Water Research

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Fixed-bed columns Adsorbent regenerationOn-line treatment process a b s t r a c t Remediation of metallurgical industry wastewater has presented a great environmental challenge for decades. In this study, a complete remediation technology was proposed for simultaneous As(III) and Cd adsorptive removal, adsorbent regeneration, and recovery of As and Cd. Using three granular TiO 2 columns in series, As(III) and Cd in the raw water at 2590 ± 295 and 12 ± 2 mg/L, respectively, could be reduced to 0.16 ± 0.11 and 0.0133 ± 0.0134 mg/L, well below the wastewater discharge limit. Spent TiO 2 media could be regenerated using H 2 SO 4 and NaOH, and the regenerated adsorbent could be re-used for at least 10 treatment cycles and 770 bed volumes with no decrease in its adsorption capacity.Remediation of 1 L wastewater generated 0.89e1.5 g solid residue which could be used as an intermediate for the As and Cd chemical refinement. The waste solution can be further treated after mixing with raw water to adjust the raw pH from 1.4 to 7. This adsorption, regeneration, and reuse process provides an innovative technology for metallurgical industry wastewater remediation that is promising for practical application.© 2014 Elsevier Ltd. All rights reserved. IntroductionMining and smelting are major industrial processes that are associated with multiple toxic metal contaminants (Bian et al., 2012). In these industrial wastewaters, coexistence of As(III) and Cd is a great public concern because of their carcinogenicity (Barrett, 2012;Lubin et al., 2008). Thus, developing effective and robust wastewater treatment technology for simultaneous As(III) and Cd removal has motivated extensive research (Allende et al., 2012;Deschamps et al., 2005;Dey et al., 2009;Jiang et al., 2014;Johnson and Hallberg, 2005). Many efforts have been made to solve this problem over past decades, with the result that neutralization-precipitation has been adopted as a commonly used method for removal of heavy metals, including As(III) and Cd, from mining and smelting wastewaters (Dong et al., 2011;McDonald et al., 2006;Wang et al., 2003). For example, an approach using iron precipitation and high density sludge (HDS) recycling has become a benchmark procedure in acid mine drainage treatment (Dey et al., 2009). This HDS process requires increasing the pH with hydrated lime and subsequently adding iron salts to form precipitates with As. However, HDS generates large volumes of sludge with low chemical stability (Dey et al., 2009;McDonald et al., 2006), which may release As under the attack of carbon dioxide (Nishimura and Robins, 1998;Pantuzzo and Ciminelli, 2010 Available online at www.sciencedirect.com ScienceDirect journal homepage: ww w.else vier.com/locate /wa tres w a t e r r e s e a r c h 6 8 ( 2 0 1 5 ) 5 7 2 e5 7 9http://dx

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“…On the contrary, the K n constant is positive in the case of phenol adsorption onto adsorption of phenol onto TiO 2 surface occurs by a chemisorption mechanism via binding ligand complex and the adsorption of heavy metal ions onto TiO 2 proceeds via cation exchange [1,10]. For instance, cadmium ions adsorption is said to proceed via exchange of hydrogen ions from surface hydroxyl groups [14].…”

Section: Single-component Adsorption Onto Tiomentioning

confidence: 99%

“…However few of them deal with competitive adsorption between organic molecules and metal ions whereas natural and waste waters contain both organics and metal ions [15]. For instance, Janusz and Matysek estimate that the presence of oxalate ions affects the adsorption of Cd(II) ions onto TiO 2 , with an important infl uence of pH [14].…”

Section: Introductionmentioning

confidence: 99%

Competitive adsorption of phenol and heavy metal ions onto titanium dioxide (Dugussa P25)

Bekkouche

Baup

Bouhelassa

et al. 2012

Desalination and Water Treatment

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Competitive adsorption of phenol and heavy metal ions onto titanium dioxide (Dugussa P25), Desalination and Water Treatment, 37:1-3, 364-372, A B S T R AC TSingle-solute adsorption of phenol (chosen as an organic pollutant) and single-solute adsorption of four heavy metal ions (Cu(II), Zn(II), Cd(II) and Fe(II) chosen as minerals pollutant) onto titanium dioxide (Dugussa P25) nanoparticles in aqueous suspension are studied. Temperature effect is studied for copper and for phenol. Furthermore, competitive adsorption between phenol and each metal cation is also studied. Phenol is dosed via HPLC while heavy metals are quantifi ed by Atomic Adsorption Spectrophotometry. The single-solute adsorption results were well fi tted by Freundlich, Langmuir, Temkin and Kiselev isotherm models. This study showed that adsorption of the different pollutants onto TiO 2 is favourable and adsorption energy was calculated as well. Moreover it is concluded that phenol adsorption and heavy metal cation adsorption do not proceed with the same mechanism. In the case of competitive adsorption in the 4 studied bisolute systems (phenol in presence of each heavy metal ion), the adsorption is decreased from 30% to 60% in comparison to single-solute results. Moreover, the Shiendorf-Rebuhn-Sheintuch (SRS) -a Freundlich type modifi ed equation -was successfully applied. This competitive model described and simulated well the bisolute isotherms results for both phenol and metal ion. The competition infl uence is based on competitive coeffi cients a ij .

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Coadsorption of Cd(II) and oxalate ions at the TiO2/electrolyte solution interface

Cited by 39 publications

References 16 publications

Adsorption of Cu²⁺Cations from Aqueous Solution by S-doped TiO₂

Adsorption of Cu²⁺Cations from Aqueous Solution by S-doped TiO₂

Simultaneous As(III) and Cd removal from copper smelting wastewater using granular TiO2 columns

Competitive adsorption of phenol and heavy metal ions onto titanium dioxide (Dugussa P25)

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Coadsorption of Cd(II) and oxalate ions at the TiO2/electrolyte solution interface

Cited by 39 publications

References 16 publications

Adsorption of Cu2+Cations from Aqueous Solution by S-doped TiO2

Adsorption of Cu2+Cations from Aqueous Solution by S-doped TiO2

Simultaneous As(III) and Cd removal from copper smelting wastewater using granular TiO2 columns

Competitive adsorption of phenol and heavy metal ions onto titanium dioxide (Dugussa P25)

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Adsorption of Cu²⁺Cations from Aqueous Solution by S-doped TiO₂

Adsorption of Cu²⁺Cations from Aqueous Solution by S-doped TiO₂