Sorption behavior of nano-TiO2 for the removal of selenium ions from aqueous solution

Zhang, Lei; Liu, Na; Yang, Lijun; Lin, Qi

doi:10.1016/j.jhazmat.2009.05.098

Cited by 110 publications

(58 citation statements)

References 22 publications

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“…Hu et al (2005) also found NaOH as the most effective desorbing agent (up to six cycles) as it removed 87.7 % of Cr(VI) from maghemite nanoparticle. In a further study by Zhang et al (2009), NaOH again proved to be better desorbing agent as it helped in achieving desorption of [95 % and recovery of 95-105 % for Se(IV). Zhu et al (2009) achieved almost 100 % desorption of adsorbed arsenic using alkaline solution (NaOH) from nano-zero-valent iron and recommended NaOH as a noble desorbing agent, but on the other hand when it was studied for recovery of Cd and Pb from yeast biomass, it was less effective in comparison with that of acids (Kordialik-Bogacka 2011; Table 1).…”

Section: Use Of Acids For Regeneration and Recovery Of Heavy Metalsmentioning

confidence: 93%

“…In first desorption cycle, use of 0.1 N and 0.5 N NaOH was very effective for removing As(V) (78-85 %) but was less effective for As(III) (only 26-49 %). Zhang et al (2009) used 0.1 M NaOH for desorption of Se(IV) from titanium dioxide nanoparticles and found more than 95 % desorption efficiency. They found 95-105 % recovery for Se(IV) ( Table 1).…”

Section: Review Of Literaturementioning

confidence: 99%

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Regeneration of adsorbents and recovery of heavy metals: a review

Lata

Singh

Samadder

2014

Int. J. Environ. Sci. Technol.

385

136

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In last a few decades, significant improvements were made in both efficiency and economy for removal of heavy metals and metalloid (arsenic) from water using adsorbents. But less attention was paid to recycling of used adsorbents and recovery of the heavy metals from the desorbing agents. For regeneration and reuse of adsorbents, various possible regenerating agents such as acids, alkalis and chelating agents (such as ethylene diamine tetraacetic acid) were used by many researchers with very limited success in some of the studies only up to a limited number of adsorption-desorption cycles. Only a few of the reported studies were focused on recovery of adsorbed (from saturated adsorbents) and desorbed metals (from regenerating agents). Though the management of the used adsorbent and recovery of heavy metals is one of the most important aspects, but only a limited number of research works considered the fate of spent adsorbents before disposal. This review summarizes the removal efficiency of various adsorbents, desorption efficiency of various regenerating agents and recovery of the heavy metals from both saturated adsorbents and desorbing solvents used for regeneration. The study will help the scientific community working on adsorption studies to take up research initiatives required to address the feasible recovery methods of heavy metals from the used adsorbents, to study the possible reuse of the desorbing agents and to choose a suitable desorbing/regenerating agent for a particular adsorbent.

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Section: Use Of Acids For Regeneration and Recovery Of Heavy Metalsmentioning

confidence: 93%

Section: Review Of Literaturementioning

confidence: 99%

Regeneration of adsorbents and recovery of heavy metals: a review

Lata

Singh

Samadder

2014

Int. J. Environ. Sci. Technol.

385

136

View full text Add to dashboard Cite

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“…Adsorption isotherm is important to describe how solutes interact with the sorbent. The Langmuir model is often used: 30 c e /q e = 1/bq m + c e /q m (5) where q m is the maximum adsorption at monolayer (mg· …”

Section: Adsorption Isotherm and Adsorption Capacitymentioning

confidence: 99%

Kinetic and Thermodynamic Investigations of Zn(II) Adsorption on Microcrystalline Anthracene Modified with 8‐Hydroxyquinoline and Its Application to the Preconcentration and Determination of Trace Zinc

Wang

Yan

2011

J Chinese Chemical Soc

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A new method that utilizes microcrystalline anthracene modified with 8-hydroxyquinoline as an adsorbent has been developed for the preconcentration of trace Zinc(II). The possible reaction mechanism is discussed in detail. The influences of different parameters, such as acidity, other metal ions, the amounts of 8-hydroxyquinoline and anthracene, etc. on the enrichment yield of Zn(II) have been studied to optimize the experimental conditions. The experimental data were fitted well with the pseudo-second-order kinetic model and Langmuir model at all studied temperatures and the maximum adsorption capacity was 32.58 mg·g -1 (300 K). The thermodynamic parameters (DG q , DH q and DS q ) showed the feasibility, exothermic and spontaneous nature of the adsorption at 280~320 K. Experiments indicate that Zn(II) can be completely separated from Cu(II), Co(II), Cd(II), Mn(II), Ni(II) in the eluent. The recovery of this method is in the range of 96.0%~105.0% with preconcentration factor of 100 and the limit of detection after preconcentration is 0.068 mg·L -1 . The proposed method has been successfully applied to the determination of trace Zn(II) in effluents and synthetic water sample having a composition similar to certified water sample SLRS-4 (NRC, Canada). Analytical results obtained by this recommended method were very satisfactory.

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“…A variety of treatment methods have been studied for Se removal from contaminated waters, including ion-exchange [9], reverse osmosis [10], zero-valent iron [11], microbial reduction [12], chemical precipitation [13], a hybrid electro-coagulation membrane process [14] and adsorption [15][16][17][18][19][20][21][22][23]. Among these, adsorption is believed to be the most promising process and has been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Removal of Se(IV) and Se(VI) from drinking water by coagulation

Chen

et al. 2015

Separation and Purification Technology

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a b s t r a c t Selenium (Se) is one of contaminants required to be regulated during drinking water treatment, however, little information has been collected to date regarding Se removal by coagulation. In this study, the performance of Se removal by coagulation has been evaluated with respect to the dependence on Se species, coagulant type, water pH and interfering ions. The results showed that a Fe-based coagulant was much more efficient than Al-based coagulants in Se removal. The removal of selenite (Se(IV)) by coagulation was much more pronounced than that of selenate (Se(VI)). With an FC dosage of more than 0.4 mM Fe/L, Se(IV) removal efficiency of more than 98% could be achieved when the initial Se(IV) concentration was 250 lg/L. For Al-based coagulants (AlCl 3 (AC) and polyaluminum chloride (PACl)) Se removal efficiency was positively correlated with the content of Al 13 species during the coagulation process. Adsorption onto hydroxide flocs was the most active coagulation mechanism for Se removal and precipitation also played specific roles at low dosage, especially for Se(IV) removal and with Fe coagulant. High coagulant dosage and weakly acidic pH could enhance the formation of hydroxide flocs having more active adsorption sites and high zeta potential, and thus favored Se removal. These findings are important to understand the efficiency and mechanisms of Se removal by coagulation.

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Sorption behavior of nano-TiO2 for the removal of selenium ions from aqueous solution

Cited by 110 publications

References 22 publications

Regeneration of adsorbents and recovery of heavy metals: a review

Regeneration of adsorbents and recovery of heavy metals: a review

Kinetic and Thermodynamic Investigations of Zn(II) Adsorption on Microcrystalline Anthracene Modified with 8‐Hydroxyquinoline and Its Application to the Preconcentration and Determination of Trace Zinc

Removal of Se(IV) and Se(VI) from drinking water by coagulation

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