Arsenate removal from aqueous solutions using modified red mud

Zhang, Shuwu; Liu, Changjun; Luan, Zhaokun; Peng, Xianjia; Ren, Haijing; Wang, Jun

doi:10.1016/j.jhazmat.2007.07.031

Cited by 104 publications

(43 citation statements)

References 25 publications

(29 reference statements)

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“…Phosphate element and arsenic element are located in the same main group, and the molecular structure of phosphate ion is very similar to that of arsenic ion. CO 3 2− was less adversely effects on arsenic removal compared this work to Zhang et al [9] (arsenic removal efficiency reduced by 4-6% compared to 20-22% when 1 mM CO 3 2− /HCO 3 − was added). The reasons may be as follows: (1) arsenic removal mechanism is different.…”

Section: Effects Of Anion Concentrations On As(v) Removalsupporting

confidence: 41%

“…The iron can be adsorbed on the surface of RM, thus strengthening the arsenic adsorption capacity [9]. The setting performance of FRS is pretty good, small RM particles may be accelerating the setting process by acting as the crystal nucleus.…”

Section: Release Of Arsenic and Iron From Frs In Acid Watermentioning

confidence: 99%

“…About 1-2 tons of RM residues are produced for a ton of alumina [8]. At present, about 10-20 million tons of caustic RM must be disposed of annually in China [9] and such residue has accumulated over years and causes a serious environmental problem due to its high alkalinity and large amount. Researches focused on the application of RM in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

“…For example, iron based sorbents and impregnated adsorbents were found effective in removing arsenic from aqueous environment [13][14][15]. Zhang et al [9] prepared ferric modified RM as adsorbent in arsenic removal, and the arsenic adsorption capacity was high.…”

Section: Introductionmentioning

confidence: 99%

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Arsenic removal from aqueous solution using ferrous based red mud sludge

Wang

Luan

et al. 2010

Journal of Hazardous Materials

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a b s t r a c tFerrous based red mud sludge (FRS) which combined the iron-arsenic co-precipitation and the high arsenic adsorption features was developed aimed at low arsenic water treatment in rural areas. Arsenic removal studies shown that FRS in dosage of 0.2 or 0.3 g/l can be used effectively to remove arsenic from aqueous solutions when initial As(V) concentration was 0.2 or 0.3 mg/l. Meanwhile, turbidity of supernatant in disturbing water was lower than 2 NTU after 24 h. The pH range (4.5-8.0) for FRS in effective arsenic removal was applicable in natural circumstance. Phosphate can greatly reduce the arsenic removal efficiency while the presence of carbonate had no significant effect on arsenic removal. Arsenic fractionation experiments showed that amorphous hydrous oxide-bound arsenic was the major components. When aqueous pH was decreased from 8.0 to 4.5, arsenic in FRS was not obviously released. The high arsenic uptake capability, good settlement performance and cost-effective characteristic of FRS make it potentially attractive material for the arsenic removal in rural areas.

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Section: Effects Of Anion Concentrations On As(v) Removalsupporting

confidence: 41%

Section: Release Of Arsenic and Iron From Frs In Acid Watermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Arsenic removal from aqueous solution using ferrous based red mud sludge

Wang

Luan

et al. 2010

Journal of Hazardous Materials

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“…Red mud (RM) is a waste residue formed after the caustic digestion of bauxite during the production of alumina. It has been studied as a coagulant for removal of pollutants, such as AsO 3À 4 [20], H 2 S [21], NO À 3 [22], PO 3À 4 , Cu 2+ [23], Zn 2+ , Ni 2+ , and CrO 2À 4 [24] from aqueous solution, for it is mainly composed of fine-grained particles containing aluminum oxide, iron oxide, silica, titanium oxides, and hydroxides. RM is unsuitable for direct application due to the high dosage, alkalinity, and low efficiency, although it was found to be good phosphorus-removing medium.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Phosphorus removal from domestic sewage by adsorption combined photocatalytic reduction with red mud

Zeng¹,

Xia²,

Dandan³

et al. 2013

Desalination and Water Treatment

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A B S T R A C TPhosphorus removal from domestic sewage by adsorption combined photocatalytic reduction with raw and modified red mud (RM) was studied in this paper. The results indicated that RM dosage, reaction time, stirring rate, phosphorus concentration, and initial pH of solution (pH i ) were the main factors to effect on phosphorus removal. It was found that the phosphorus removal efficiency of modified red mud (RM-m) under the photocatalytic test conditions was higher than only by adsorption process, while raw red mud (RM-raw) showed no significant difference under the two conditions. With initial phosphorus concentration 8.26 mg/L, reaction time 60 min, stirring rate 200 r/min, under the adsorption and photocatalytic test conditions, the optimum dosage and pH i of both RM-raw and RM-m were 1.8 g/L and 4.0, respectively, and the corresponding phosphorus removal of RM-raw and RM-m were 90.18 and 91.70%, respectively. The optimum amount of RM-m under the two conditions were 1.6 and 1.5 g/L, respectively, the optimal pH i 3.0, correspondingly, the phosphorus removal could reach high up to 94.30 and 99.96%, respectively.

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Coordination and Solution Chemistry of the Metals: Biological, Medical and Environmental Relevance

Ruggiero

2011

The Group 13 Metals Aluminium, Gallium, Indium and Thallium: Chemical Patterns and Peculiarities

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Arsenate removal from aqueous solutions using modified red mud

Cited by 104 publications

References 25 publications

Arsenic removal from aqueous solution using ferrous based red mud sludge

Arsenic removal from aqueous solution using ferrous based red mud sludge

Phosphorus removal from domestic sewage by adsorption combined photocatalytic reduction with red mud

Coordination and Solution Chemistry of the Metals: Biological, Medical and Environmental Relevance

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