Abstract:h i g h l i g h t sFe-La composite (hydr)oxides were synthesized via coprecipitation method. Fe-La composite (hydr)oxides were effective for arsenate removal from water. As(V) was removed by both precipitation and sorption under acidic condition. As(V) removal was achieved by adsorption under alkaline condition.
t r a c tArsenic exists ubiquitously in the environment and has been proved to be of great harm to human health. In this study, a series of Fe-La composite (hydr)oxides were synthesized via a facile c… Show more
“…Similar observation was also found for Cr(VI) adsorption that removal of Cr(VI) decreased significantly with pH increasing from 9 to 11. Trends of both As(V) and Cr(VI) adsorption on La-modified ceramic granules as a function of pH were consistent with anionic contaminant adsorption on other La-based adsorbents 31,40–42 . The dominant As(V) and Cr(VI) species in the solution were all anions under the tested pH range (4–11) 21,22 .…”
Section: Resultssupporting
confidence: 68%
“…Figure 6 shows the adsorption kinetics of As(V) and Cr(VI) by the La-modified ceramic granules treated at 385 °C. Both kinetics curves exhibited a rapid initial uptake and the adsorption plateaued within ~24 h. The adsorption kinetics of As(V) observed in this research was faster than previously reported results while the adsorption kinetics of Cr(VI) was comparable to Cr(VI) adsorption by other reported La-amended adsorbents 29,31 .Figure 6Adsorption kinetics for As(V) and Cr(VI) on La-modified granular ceramic materials treated at 385 °C. Solution pH 6.8, As(V) concentration and adsorbent dosage were 20 mg/L and 1.0 g/L, and Cr(VI) concentration and adsorbent dosage were 3 mg/L and 0.5 g/L, respectively.…”
The development of economical, low-maintenance, environmentally friendly and effective water filtration techniques can have far-reaching public health, social and economic benefits. In this research, a cost-effective La-modified granular ceramic material made of red art clay and recycled paper fiber was developed for the removal of two major anionic contaminants, As(V) (arsenate) and Cr(VI) (chromate). La modification temperature significantly impacted the resulting composition and properties of the adsorbents, and thus played a crucial role in the adsorbent performance. The La-modified ceramic materials were extensively characterized through scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area measurement, thermal gravimetric analysis (TGA), zeta potential measurements, and Fourier-transform infrared spectroscopy (FTIR) analysis. The characterization results suggested that surface coating by LaONO
3
-related compounds was critical for As(V) and Cr(VI) adsorption. At the modification temperature of 385 °C, the adsorption of As(V) and Cr(VI) reached maximum, which were 23 mg/g and 13 mg/g, respectively, under circumneutral conditions that are relevant to various aquatic systems. The adsorption kinetics and isotherm, the influence of pH, ionic strength and coexisting anions on As(V) and Cr(VI) adsorption were investigated to further understand both As(V) and Cr(VI) adsorption behavior. Findings from this research showed that La-modified ceramic material made of recycled paper waste represents a cost-effective adsorbent for anionic contaminant removal under environmentally relevant conditions.
“…Similar observation was also found for Cr(VI) adsorption that removal of Cr(VI) decreased significantly with pH increasing from 9 to 11. Trends of both As(V) and Cr(VI) adsorption on La-modified ceramic granules as a function of pH were consistent with anionic contaminant adsorption on other La-based adsorbents 31,40–42 . The dominant As(V) and Cr(VI) species in the solution were all anions under the tested pH range (4–11) 21,22 .…”
Section: Resultssupporting
confidence: 68%
“…Figure 6 shows the adsorption kinetics of As(V) and Cr(VI) by the La-modified ceramic granules treated at 385 °C. Both kinetics curves exhibited a rapid initial uptake and the adsorption plateaued within ~24 h. The adsorption kinetics of As(V) observed in this research was faster than previously reported results while the adsorption kinetics of Cr(VI) was comparable to Cr(VI) adsorption by other reported La-amended adsorbents 29,31 .Figure 6Adsorption kinetics for As(V) and Cr(VI) on La-modified granular ceramic materials treated at 385 °C. Solution pH 6.8, As(V) concentration and adsorbent dosage were 20 mg/L and 1.0 g/L, and Cr(VI) concentration and adsorbent dosage were 3 mg/L and 0.5 g/L, respectively.…”
The development of economical, low-maintenance, environmentally friendly and effective water filtration techniques can have far-reaching public health, social and economic benefits. In this research, a cost-effective La-modified granular ceramic material made of red art clay and recycled paper fiber was developed for the removal of two major anionic contaminants, As(V) (arsenate) and Cr(VI) (chromate). La modification temperature significantly impacted the resulting composition and properties of the adsorbents, and thus played a crucial role in the adsorbent performance. The La-modified ceramic materials were extensively characterized through scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area measurement, thermal gravimetric analysis (TGA), zeta potential measurements, and Fourier-transform infrared spectroscopy (FTIR) analysis. The characterization results suggested that surface coating by LaONO
3
-related compounds was critical for As(V) and Cr(VI) adsorption. At the modification temperature of 385 °C, the adsorption of As(V) and Cr(VI) reached maximum, which were 23 mg/g and 13 mg/g, respectively, under circumneutral conditions that are relevant to various aquatic systems. The adsorption kinetics and isotherm, the influence of pH, ionic strength and coexisting anions on As(V) and Cr(VI) adsorption were investigated to further understand both As(V) and Cr(VI) adsorption behavior. Findings from this research showed that La-modified ceramic material made of recycled paper waste represents a cost-effective adsorbent for anionic contaminant removal under environmentally relevant conditions.
“…The point of zero charge (pzc) for Fe-Ag MBON was determined by plotting as final pHinitial pH (pHf-pHi) versus pH, yielded the pzc as the pH where pHf-pHi = 0 according to the method described by Zhang et al [29] 2.4.Batch adsorption experiments Fluoride adsorption experiments by prepared Fe-Ag MBON carried out in batch condition and experimental scale in 100 ml flask while shaking on a shaker-incubator at 180 RPM. Structural analysis of an adsorbent and the information of various functional groups in the adsorbent were conveyed by Fourier transform infrared spectroscopy with spectral grade KBr in an agate mortar (FTIR, FTS-165, BIO-RAD, USA).…”
Section: 3adsorbent Characterizationmentioning
confidence: 99%
“…2. In simpler terms, can be expressed that adsorbents with ball-like nanoparticle has the largest specific surface area compare than nano fragment materials [25]. Fe-Ag with 3:1 molar ratio was micro porous (average pore diameters <2 nm) and other materials with different molar ratio were mesoporous (2nm <average pore diameters> 50 nm) since they showed a hysteresis loop for the desorption isotherm.…”
Section: 2specific Surface Area Of Fe-ag Mbonmentioning
confidence: 99%
“…Studies of late focus on searching for various sorbents with low cost and high efficient for fluoride removal including activated alumina [12], zeolite [13], hydroxyapatite [14], clay [15], modified chitosan beads [16]. These composites exhibited superior adsorption performance for Fluoride removal than their individual components (Their parent materials) [25]. Iron oxides are regarded as well-known adsorbent due to their high affinities toward inorganic pollutant, high selectivity in sorption processes, low-cost and environmental friendliness [18,19].…”
Fe-Ag magnetic binary oxide nanoparticle (Fe-Ag MBON) are prepared with co-precipitation of ferric and ferrous chloride solution, and used for the adsorption of Fluoride from aqueous solution. The surface morphology of adsorbent was characterized by XRD, SEM, TEM, FTIR, XPS, EDX, BET, DLS and VSM techniques. Batch method was followed to optimize the conditions for the removal of Fluoride. The results showed maximum removal was occurred at pH 3.0 and adsorption equilibrium was achieved within 20 min. Chemical kinetics of the adsorption were well fitted by pseudo-second order models (R 2 >0.968) and the adsorption process followed the Langmuir isotherm model well (R 2 >0.976). The Fluoride adsorption capacity of Fe-Ag MBON were 22.883 mg/g, and decreased with increasing the temperature. Thermodynamic values revealed that the Fluoride adsorption process was spontaneous and exothermic. Regeneration experiments were carried out for six cycles and the results indicate a removal efficiency loss of < 22%.
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