Arsenic(V) removal with a Ce(IV)-doped iron oxide adsorbent

Zhang, Yu; Yang, Min; Huang, Xia

doi:10.1016/s0045-6535(02)00850-0

Cited by 247 publications

(136 citation statements)

References 23 publications

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“…The obtained sorption capacity for Fe-modified peat was 15.11 mg g -1 , whereas in the presence of SO 4 2− anions it was 13.67 mg g -1 , and in the presence of NO 3 − , Cl − and tartrate anions - 13.12 mg g -1 , 15.01 mg g -1 and 13.3 mg g -1 respectively. The results of this study are in agreement with the research done under the supervision of Y. Zhang [36], who suggested that Cl − , NO 3 − and SO 4 2− do not interfere with the removal of As(V) using Ce-Fe adsorbent. In contrast to that, the presence of oxalate, phosphate and humic acid significantly reduced the removal rate of arsenic (Fig.…”

Section: Influence Of Competing Substances On Sorption Of Metalloidssupporting

confidence: 91%

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

Ansone-Bertina

Kļaviņš

2016

Open Chemistry

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Abstract:The present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5-9 and for As(V) and Sb(V) -3-6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3-9. The presence of competing ions as well as HA affect sorption of metalloids on Fe-modified peat. A minor impact on the reduction of metalloid sorption was detected in the presence of nitrate, sulphate, carbonate and tartrate ions, while in the presence of phosphate and HA the sorption ability of metalloids can be considerably reduced. The obtained results of kinetic experiments indicate that sorption of metalloids on Fe-modified peat mainly occurs relying on mechanisms of physical sorption processes.Keywords: peat, sorbents, arsenic, antimony, tellurium, metalloids Environmental contextGrowing attention is being paid to environmental pollution with metalloids (As, Sb, Te) requiring new approaches for removal of these elements from water. The present work investigates arsenic, antimony and tellurium sorption using iron modified peat. Iron modified peat has high sorption capacity in respect to all environmentally relevant metalloid speciation forms [As(V), As(III), As(org.), Sb(III), Sb(V), Te(IV) and Te(VI)]. The sorption takes place according to mechanisms of physical sorption and is affected by pH of a solution as well as competing ions.

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Section: Influence Of Competing Substances On Sorption Of Metalloidssupporting

confidence: 91%

Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

Ansone-Bertina

Kļaviņš

2016

Open Chemistry

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“…100 mmol L −1 stock solutions of arsenate, P, and F ions were prepared by dissolving dibasic sodium arsenate, potassium dihydrogen phosphate, and sodium fluoride, respectively, in distilled water. Fe-Ce bimetal oxide adsorbents were prepared by a coprecipitation method and were characterized as described in our previous work [6,7].…”

Section: Methodsmentioning

confidence: 99%

“…The surface hydroxyl groups on metal oxides are considered as the most abundant and active adsorption sites for adsorption of anions from water [28][29][30]. In our previous studies [6,7] the surface acidity and formation of surface hydroxyl groups of the Fe-Ce have been provide to the interpretation of the adsorption behaviors. At the same time, the exchange of surface sulfate groups has also been suggested to be an important mechanism for the removal of arsenate [31,32].…”

Section: Surface Active Sites For Arsenate Adsorptionmentioning

confidence: 99%

“…Recently, an iron-cerium (Fe-Ce) bimetal oxide adsorbent has been successfully developed for arsenate removal, which has a higher adsorption capacity (2.00 mmol g −1 ) than many reported adsorbents [6]. Batch and long-term column studies on arsenate adsorption performance using groundwater samples from Inner Mongolia and the suburbs of Beijing, respectively, have shown that the adsorbent is a promising one, although its performance might be affected by some coexisting substances [7,8]. However, how F or P competes with arsenate for sites on the adsorbent surface has hitherto been unclear.…”

Section: Introductionmentioning

confidence: 99%

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Removal of arsenate from water by using an Fe–Ce oxide adsorbent: Effects of coexistent fluoride and phosphate

Zhang

Dou

Yang

et al. 2010

Journal of Hazardous Materials

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“…Human poisoning and death from arsenic have occurred in Taiwan, Bangladesh, India, etc. [2]. Chronic arsenism poses a serious health problem in China also [3].…”

Section: Introductionmentioning

confidence: 99%