Enhanced Adsorption of Selenium Ions from Aqueous Solution Using Iron Oxide Impregnated Carbon Nanotubes

Bakather, Omer Y.; Fard, Ahmad Kayvani; Ihsanullah, Ihsanullah; Khraisheh, Majeda; Nasser, Mustafa S.; Atieh, Muataz Ali

doi:10.1155/2017/4323619

Cited by 41 publications

(41 citation statements)

References 54 publications

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“…This result is consistent with the previous literature showing Freundlich fit for Se(IV) sorption using different sorbents such as layered double hydroxide (LDH) nanoparticle 39 and iron oxide impregnated carbon nanotubes. 16 …”

Section: Results and Discussionmentioning

confidence: 99%

“…Iron oxide impregnated carbon nanotubes showed the maximum Se(IV) adsorption capacity of 111 mg·g –1 , which is lower than that of Ca-alginate@citrus observed in the present study. 16 When compared to the maximum Se(IV) adsorption capacity of other adsorbents such as iron oxy-hydroxides, 42 Fe-metal organic framework (Fe-MOF) and Al-impregnated Fe-MOF (Al@Fe-MOF), 43 magnetite nanoparticles, 44 Fe 3 O 4 -chitosan nanocomposites, 45 MgO nanosheets, 46 and Fe/Si and Al/Si coprecipitate, 47 the citrus peels and Ca-alginate@citrus in the present study showed superior maximum biosorption capacity.…”

Section: Results and Discussionmentioning

confidence: 99%

“… 14 The membrane processes suffer from fouling and need regular replacement of membranes, 15 while microbial processes are slow and require an additional and ongoing supply of a carbon source. 16 Biosorption techniques, however, have gained importance for the treatment of Se contaminated waters especially due to their low-cost and waste resource recovery potential, making them alternative sustainable options. 17 − 20 Se has been removed from contaminated water using different biosorbents such as peanut shell, 21 crustacean shell, 22 wheat, maize, and rice bran, 23 dry yeast biomass, 24 and seaweed.…”

Section: Introductionmentioning

confidence: 99%

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Adsorptive Removal of Se(IV) by Citrus Peels: Effect of Adsorbent Entrapment in Calcium Alginate Beads

et al. 2020

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Selenium (Se) contamination in natural waters impacted by anthropogenic activities is becoming a prevalent and widespread problem. Investigation of novel, low-cost, and sustainable food-waste-sourced adsorbents for Se removal has largely been unexplored. Here, we report on the Se(IV) biosorption from a liquid solution using three waste-derived/low-cost biosorbents, namely citrus peels (bare), Ca-alginate gel beads, and Ca-alginate-citrus peels composite beads (Ca-alginate@citrus). The entrapment of citrus peels by Ca-alginate not only provided a structural framework for the citrus peel particles but also preserved the high-efficiency Se(IV) removal property of the citrus peels. From the modeling results, it was established that Se(IV) biosorption followed the fixed-film diffusion model, along with pseudo-second-order kinetics. Investigation of pH impacts along with initial dosing of sorbent/sorbate demonstrated that all of the three biosorbents exhibited optimum biosorption of Se(IV) at pH 6−8, 50–75 mg·L –1 of Se(IV), and 1–5 mg·L –1 of biosorbent. Overall, the maximum Se(IV) biosorption capacities were measured to be 116.2, 72.1, and 111.9 mg·g –1 for citrus peels, Ca-alginate, and Ca-alginate@citrus, respectively, with citrus peels (bare and immobilized) showing among the highest reported values in the literature for Se(IV) adsorption. This work provides a platform for the future development of an efficient filtration system using Ca-alginate@citrus as an inexpensive, novel, and sustainable biosorbent to treat Se(IV) contaminated water.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorptive Removal of Se(IV) by Citrus Peels: Effect of Adsorbent Entrapment in Calcium Alginate Beads

et al. 2020

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“…The BET results for IOCS and ZVICS show increases since the irregular structure of the coated particles on the sand grains caused an increased surface area. Bakather et al 44 found that the removal of selenium (Se) by CNTs modified with 5%, 10% and 20% iron oxide nanoparticles increased due to increasing available sorption area, with apparent values of 226.6, 295.4, and 360 m 2 /g, respectively. Furthermore, Sharma et al 45 found that the iron sorption capacity onto coated sand appeared to be 10 to 55 times higher than that of the new sand due to the large specific surface area.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the chemical nonequilibrium TSM model was applied to estimate the nonequilibrium parameters, including Kf, 1/n, f and α for As(V) transport in the column experiments. The sum of square errors (SSE) and coefficient of determination (R 2 ) were used to assess the goodness of fit the curves 44 .…”

Section: Methodsmentioning

confidence: 99%

Influences of pH on transport of arsenate (As5+) through different reactive media using column experiments and transport modeling

Chotpantarat

Amasvata

2020

Sci Rep

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This research aims to evaluate the effects of pH, including both acidic and neutral conditions to simulate an acid mine environment, on the sorption and transport of As(V) in contaminated groundwater through different reactive materials by using column experiments and mathematical modeling. Six saturated columns were set up to evaluate the migration and removal efficiency of As(V) with three different materials acting as permeable reactive barrier (PRB) media under different pH conditions (pH 4 and pH 7). The reactive materials consisted of pure sand (control column), iron oxide-coated sand (IOCS) and a combination of IOCS and zero-valent iron-coated sand (ZVICS) (ZVICS + IOCS). According to the column experiments, the descending order of removal capacity (mg As/g) for ZVICS + IOCS, IOCS and sand was 0.452 > 0.062 > 0.0027 mg As/g at pH 4 and 0.117 > 0.0077 > 0.0022 mg As/g, respectively, at pH 7. The column experiments showed that the removal and retardation factor (RF) of As(V) generally increased with decreasing pH. The SEM images and the corresponding EDX spectra of acid-washed natural sand, IOCS and ZVICS + IOCS from the columns showed that the peak of As was detectable on the reactive materials. The mechanism of As(V) sorption onto sand at pH 4 and pH 7 corresponded to the uniform (equilibrium) solute transport model, whereas the IOCS and ZVICS + IOCS columns corresponded to the two-site model (TSM) with the Freundlich isotherm. The fraction of instantaneous sites (f) for As(V) sorption onto IOCS and ZVICS + IOCS appeared to decrease with increasing pH, especially for ZVICS + IOCS, which indicates that nonequilibrium sorption/desorption mainly dominated during As(V) migration.Arsenic (As) can contaminate the environment via natural processes (e.g., erosion and weathering processes of soils, minerals, and ores) and human activities (e.g., mining activities, combustion of fossil fuels, and use of pesticides and herbicides) 1 . Arsenic is often found at elevated concentrations in groundwater. Its occurrence in groundwater depends on the types of rock and soil in the area. Regarding the increased concentrations of As in natural groundwater, there are many areas in the world, including some areas in Thailand, where As is found in higher concentrations than the World Health Organization (WHO) guideline of 10 μg/L 2 . For example, Choprapawon et al. 3 has studied the impact of As for decades in the Ronpibool District, Nakorn Sri Thammarat, the Southern province of Thailand. The provincial administrative organization and the inhabitants of this district have recognized the harmful effects of As contamination in natural water sources in Ronpibool District for more than 10 years. Moreover, villagers who live near the area surrounding gold mines in the Wangsaphung District, Loei province, Thailand, complained in 2006 about contamination of As and found significant high levels of As in soils, water and plants near the gold mine area 4 . This has become a serious issue because groundwater has been increasingly used for ...

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Bifunctional Peptide‐Assisted Synthesis of Magnetic Carbon Nanotubes for Toluidine Blue Dye Remediation in Aqueous Conditions

et al. 2022

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Carbon nanotubes (CNTs) are known to be a suitable adsorbent of organic contaminants due to their large surface area and hollow structures; but at the nanoscale, CNTs have poor solubility and can be difficult to remove from solution. Studies have shown that the use of peptides can control the size, shape, and structure of materials during synthesis. In this research, magnetic CNTs were synthesized in a co‐precipitation reaction in the presence of the M6A−B1 peptide to correct these deficiencies in CNTs. Characterization of nanoparticles was facilitated by analytical methods including scanning electron microscopy, infrared spectroscopy, x‐ray diffraction, elemental analysis, and more. Water remediation studies were conducted to study the effect of dye, pH, and adsorbent on the removal of Toluidine Blue O from an aqueous solution. Pseudo‐second order kinetics were used in describing the rate of adsorption while a Langmuir isotherm model was used to study the interaction between the peptide‐functionalized material and the adsorbate. The separation factor, RL, calculated for the studied dye concentrations showed that adsorption with the peptide‐functionalized material was favorable.

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Enhanced Adsorption of Selenium Ions from Aqueous Solution Using Iron Oxide Impregnated Carbon Nanotubes

Cited by 41 publications

References 54 publications

Adsorptive Removal of Se(IV) by Citrus Peels: Effect of Adsorbent Entrapment in Calcium Alginate Beads

Adsorptive Removal of Se(IV) by Citrus Peels: Effect of Adsorbent Entrapment in Calcium Alginate Beads

Influences of pH on transport of arsenate (As5+) through different reactive media using column experiments and transport modeling

Bifunctional Peptide‐Assisted Synthesis of Magnetic Carbon Nanotubes for Toluidine Blue Dye Remediation in Aqueous Conditions

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