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

Synthesis of Ce(III)-doped Fe3O4 magnetic particles for efficient removal of antimony from aqueous solution

“…However, the reported chemical compositions of the as-prepared samples were not exactly the same as those of the initial mixed solutions. The maximum Ce/(Fe + Ce) molar ratio of Ce-doped Fe 3 O 4 was about 0.23 for Ce-doped (0.5) Fe 3 O 4 , a similar result can be found from co-precipitation samples synthesized by Zhang et al [39]. To compare with other trivalent ions, the maximum doping ratio of Fe-oxide for Al III , Cr III , Mn III , V III , and Co III is in the range from 0.06 to 0.47 [40].…”

Arsenic and fluoride contaminated groundwaters: A review of current technologies for contaminants removal

“…The presence of humic acid also affects As and F adsorption on various adsorbents (Dadwhal et al, 2011;Guan et al, 2012;Jimenez-Nunez et al, 2012;Wei et al, 2011). In fact, the coexistence of As and F too affects the individual removal (Chen et al, 2010Zhang et al, 2010).…”

“…e3.76 mg/L B ¼ 0.1e33.9 mg/L À 16 sites, Kyushu, Japan À Reduction of As concentration to less than 0.01 mg/L was obtained up to bed volume ¼ 200 À Remarks: À The focus was only on As; no mention on F removal Yoshizuka et al (2010) À Ceramic adsorbent prepared with a mixture of akadama mud, wheat starch, and Fe 2 O 3 À Lab scale research À Synthetic water As(V) ¼ 10 and 20 mg/L (kinetic studies) As(V) ¼ 5, 10, 20, 50, 65, 80, and 100 mg/L, respectively (isotherm studies) À As(V) adsorption capacity (Langmuir isotherm) ¼ 4.19 mg/g À Complex multilayer As(V) adsorption was observed on ceramic material À Presence of P and F affected As(V) adsorption Chen et al (2010) À Bone char, goethite coated sand (G-IOCS) and hematite coated sand (H-IOCS) À Lab scale research À Synthetic water À Composition: F ¼ 1e200 mg/L with or without As (0.25 mg/ L) As ¼ 0.1e2.5 mg/L with or without F (10 mg/L) À F and As(III) and As(V) adsorption capacity was higher in bone char than in G-IOCS and H-IOCS À F removal was not affected by the presence of environmentally significant As(III) and As(V) concentrations À F competes with As(V) for adsorption onto bone char Mlilo et al (2010) À Goethite À Lab scale research À Synthetic water À Composition: F ¼ 5.1e25.1 mg/L As(V) ¼ 2.51e10.12 mg/L À F adsorption capacity ¼ 0.191e0.518 mg/g À As(V) adsorption capacity ¼ 0.247e0.941 mg/g À F and As adsorption was seen strongly dependent on contact time, pH, and surface loading À F and As(V) adsorption onto goethite obeyed pseudo second-order rate law À As(V) showed much stronger affinity for goethite than F À FeeCe oxide À Lab scale research À Synthetic water À Composition: As(V) ¼ 13.3 mmol/L Series of molar ratios of As to P (1:0.1, 1:1, and 1:10) and As to F (1:1, 1:10, and 1:100) À pH ¼ 5.0 ± 0.2 À P strongly inhibited adsorption of As(V) at the low-bindingenergy sites À Coexistence of F, only influenced total adsorption capacity of As(V) at high simultaneous F concentrations À As(V) and P were mainly adsorbed through the substitution of Fe surface active sites À F was mainly adsorbed through substitution of Ce surface active sites on FeeCe surface Zhang et al (2010) À Adsorption on layered double hydroxides À Lab scale research À Power plant effluent data from greater Los Angeles, USA used to simulate water À Composition: As ¼ 0.02 mg/L F ¼ 1 mg/L NO 3 ¼ 5 mg/L Cl ¼ 100 mg/L CO 3 ¼ 5 mg/L SO 4 ¼ 100 mg/L HPO 4 ¼ 1 mg/L À pH ¼ 8 À Effect on As adsorption F < NO 3 < Cl < CO 3 < SO 4 < P À Presence of F greatly affected adsorption equilibrium constant in As adsorption À As adsorption capacity ¼ 3.6 mg/g À F adsorption capacity ¼ 34.9 mg/g Dadwhal et al (2011) À Inorganic ion exchangers developed based on double hydrous oxides of Mg and Al À Lab scale research À Synthetic water À Very fast kinetics of arsenate adsorption was observed À As(V) adsorption capacity ¼ 220 mg/g À As(III) adsorption capacity ¼ 30e35 mg/g À Fluoride, bromate, bromide, selenate, borate, etc. compete for adsorption sites Chubar (2011) À Adsorption on ferric-impregnated volcanic ash À Lab scale research À Synthetic water and surface water À Composition: As z 1 mg/L F ¼ 0.2e0.5 mg/L À Lake Kasumigaura, Japan À As(V) adsorption capacity (Langmuir isotherm) ¼ 6.13 mg/g À Existence of multivalence metallic cations improved As(V) adsorption À Competing anions (F and P) affected As(V) adsorption Chen et al (2011) À Fe and Al doped micro and nano-polymeric beads À Lab scale research À Synthetic water À Composition: F ¼ 10e100 mg/L As ¼ 1 e50 mg/L (Separately tre...…”

Arsenic Adsorption on Lanthanum-Impregnated Activated Alumina: Spectroscopic and DFT Study

“…8,9 Their results show that As(V) is covalently bonded with Fe instead of Ce on REMA. 9 The addition of Ce in iron oxides, alternatively, contributes to the destruction of the magnetite crystal phase and the formation of an amorphous Fe−Ce structure. 8 However, this explanation had difficulty interpreting the enhanced As removal efficacy of REMAs without iron oxides.…”