Study of chromium adsorption by iron hydroxide

Hmamou, Mhamed; Sbihi, K.; Ammary, Bouchaib; Bellaouchou, A.

doi:10.1016/j.matpr.2019.07.528

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…2b) suggests that their retention is controlled by the iron present in the sediments. It is well known that As and Cr oxyanion species are often sorbed on Al, Fe and Mn oxides and hydroxides hosted as cement or coatings in lithic fragments of loess sediments (Hmamou et al, 2020;Li et al, 2017;Nicolli et al, 2012;Tufo, 2013). In addition, these trace elements may also be retained by clays (Goldberg, 2002;Lin & Puls, 2000;Uddin, 2017;Unda-Calvo et al, 2019).…”

Section: Geochemistrymentioning

confidence: 99%

Geochemical characterization and the assessment of trace element retention in sediments of the Reconquista River, Argentina

Cantera

Tufo

Scasso

et al. 2021

Environ Geochem Health

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The mineralogical and geochemical characterization of sediments of the Reconquista River allows analyzing the geochemical partition of trace elements in one of the most polluted water courses of Argentina. The low dissolved oxygen and high ammonia contents, together with the high chemical oxygen demand, attest to the poor water quality. Ammonia, Cd and Cu content in surficial water exceeds the maximum guidelines for freshwater in Argentina. The recent sediments of the uppermost bed are enriched in organic matter (OM), sulfur, Zn, Cu and Pb. The enrichment factor is moderate, and the geoaccumulation index (Igeo) for Cu and Pb indicates uncontaminated to moderately contaminated sediments. The positive and significant correlation between As, Cr, Pb and Zn with the iron content suggests that their retention is controlled by the amount of iron oxy (hydr)oxides in the sediments, probably combined with the silt ? clay abundance. In comparison with its tributary, the Las Catonas Stream, the Reconquista River, has less OM and trace elements in the sediments and more dissolved trace elements in the interstitial water. We interpret that OM is the main

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Section: Geochemistrymentioning

confidence: 99%

Geochemical characterization and the assessment of trace element retention in sediments of the Reconquista River, Argentina

Cantera

Tufo

Scasso

et al. 2021

Environ Geochem Health

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The synthesis of nanocellulose-based nanocomposites for the effective removal of hexavalent chromium ions from aqueous solution

et al. 2022

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The present study reports the synthesis of a polydopamine (PDA)/nanocellulose (NC) nanocomposite for the effective removal of chromium ions from water. PDA was used to modify NC surface producing a nanocomposite namely PDA/NC, by in situ polymerization of dopamine on the surface of NC. Thereafter, the as-synthesized nanocomposite was characterized using familiar techniques such as Fourier transform infrared, X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, and transmission electron microscopy. All results indicated the successful combination of PDA and NC in one nanocomposite. The PDA/NC nanocomposite was evaluated for the removal of hexavalent Cr(vi) ions from an aqueous solution. The adsorption conditions, such as pH, contact time, and initial Cr(vi) concentration, were optimized. Adsorption kinetic studies revealed that Cr(vi) removal on the surface of PDA/NC nanocomposite followed the pseudo-second-order kinetic model. Furthermore, isotherm studies revealed that Cr(vi) removal followed the Langmuir isotherm model with a maximum adsorption capacity (q m) of 210 mg/g. The adsorption mechanism study indicated that the Cr(vi) removal was reached via complexation, adsorption, and chemical reduction. The reusability of a PDA/NC nanocomposite for the removal of Cr(vi) ions was studied up to five cycles with acceptable results. The high adsorption capacity and multiple removal mechanisms validated the effective applicability of PDA/NC nanocomposite as a useful adsorbent for the removal of Cr(vi) ions from aqueous solution.

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Study of chromium adsorption by iron hydroxide

Cited by 2 publications

References 23 publications

Geochemical characterization and the assessment of trace element retention in sediments of the Reconquista River, Argentina

Geochemical characterization and the assessment of trace element retention in sediments of the Reconquista River, Argentina

The synthesis of nanocellulose-based nanocomposites for the effective removal of hexavalent chromium ions from aqueous solution

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