Synthesis and performance evaluation of diphenylcarbazide functionalized mesoporous silica for selective removal of Cr(VI)

Mumtaz, Kiran; Iqbal, Sajid; Shahida, Shabnam; Shafique, Munib Ahmed; Wasim, Mohammad; Ahmad, Bashir

doi:10.1016/j.micromeso.2021.111361

Cited by 12 publications

(4 citation statements)

References 66 publications

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“…For this purpose, materials having high removal capacity and chemical stability and are easily transformable to the solid monolith directly or by mixing with the least amount of external binders are considered promising materials. Various materials like bio-adsorbents, 14,23–25 composites, 26–29 magnetic materials 30 and inorganic materials 27,31,32 have been used for the removal of Sr( ii ) from contaminated water. Each of these materials has its own merits and demerits, for instance, bio-sorbents show limited removal efficiency for metal ions at low or trace level concentrations.…”

Section: Introductionmentioning

confidence: 99%

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

et al. 2023

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“…In addition, the Cr(VI) ion adsorption capacity of the NH-silica beads obtained in this study was compared with those of various particles functionalized by silane coupling reactions in Table 9 [ 8 , 11 , 12 , 13 , 46 , 47 , 48 , 49 , 50 , 51 ]. First, we should bear in mind that the experimental conditions, such as the initial pH value, temperature, dose of the adsorbent sample, and initial concentration and volume of the aqueous K 2 Cr 2 O 7 solution, vary from article to article.…”

Section: Resultsmentioning

confidence: 99%

“…The construction of new adsorbent materials is a current requirement of great necessity. In recent years, mesoporous silica or glass beads have been used as an adsorbent matrix because of their high surface areas, adjustable size of pores, evident surface properties, good mechanical stability, and reduced toxicity [ 8 , 9 , 10 , 11 , 12 , 13 ]. Reactively active Si-OH bonds present on the surfaces of the pore walls can be modified with functional moieties.…”

Section: Introductionmentioning

confidence: 99%

Kinetic, Isotherm, and Equilibrium Investigation of Cr(VI) Ion Adsorption on Amine-Functionalized Porous Silica Beads

et al. 2022

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The hexavalent chromium (Cr(VI)) ion adsorption properties were conferred to porous silica beads by introducing alkylamine chains through functionalization with an aminosilane coupling agent, [3-(2-aminoethylamino)propyl]triethoxysilane (AEAPTES), or with an epoxysilane coupling agent, (3-glycidyloxypropyl)triethoxysilane (GOPTES), and polyfunctional amine compounds or poly-ethylenimines (PEIs). The presence of amino groups on the silica beads was confirmed by XPS and the amount of amino groups increased to 0.270 mmol/g by increasing the AEAPTES concentration and/or reaction time. The adsorption capacity of the silica beads functionalized with AEAPTES was the maximum at the initial pH value of 3.0 and the initial adsorption rate increased with an increase in the temperature. The adsorption capacity increased with an increase in the amount of amino groups at pH 3.0 and 30 °C. The adsorption behavior obeyed the pseudo-second order kinetic model and was well expressed by the Langmuir isotherm. These results support that Cr(VI) ion adsorption is accomplished through the electrostatic interaction between protonated amino groups and HCrO4- ions. In addition, the adsorption capacity further increased to 0.192–0.320 mmol/g by treating the GOPTES-treated silica beads with triethylenetetramine, pentaethylenehexamine, or PEI. These empirical, equilibria, and kinetic aspects obtained in this study support that the porous silica-based adsorbents prepared in this study can be applied to the removal of Cr(VI) ions.

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“…Therefore, it is still interesting to explore another type of ionophore to be used in the fabrication of solid-state membranes for ISE construction. One of the most common reagents for chromium(VI) measurement in 1,5-diphenylcarbazide (DPC) is a chelating agent with a significant affinity and selectivity for Cr(VI) complexation [22,23]. Zeolite as a porous material provides uniformity in terms of shape and pore selectivity, which facilitates ions in accessing its framework for sensing purposes during electroanalytical studies [24,25].…”

Section: Introductionmentioning

confidence: 99%

Potentiometric sensor for chromium(VI) using a composite of diphenylcarbazide-natural zeolite-modified membrane electrodes

Heryanto¹,

Rohaeti²,

Wulansari³

et al. 2022

ScienceAsia

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The construction and performance of ion selective electrodes (ISEs) for the determination of chromium(VI) based on PVC membranes modified with 1,5-diphenylcarbazide (DPC) and natural zeolite as ionophores are reported in this study. ISE was fabricated in an optimum composition of chromium(VI)-selective membrane consisting of 29 mol% DPC, 43.6 mol% natural zeolite, 25 mol% plasticizer, and 2.2 mol% PVC. The investigation of the performance of the proposed ISE was evaluated in terms of the Nernstian response, range of concentration, limit of detection, response time, and selectivity coefficient. The proposed ISE displayed a linear potential response over a concentration range of 10 −1 -10 −6 M K 2 Cr 2 O 7 with a Nernstian response of −28.8 mV/decade. Adequate sensitivity for chromium(VI) was offered by the proposed ISE with a limit of detection of 2.14×10 −6 M and a response time of ∼250 s. The fabricated ISE has also been investigated in selectivity studies in the presence of Cu 2+ and Fe 3+ and was found to be more selective in the concentration range of 10 −1 -10 −6 M. Therefore, a novel membrane electrode using a composite of DPC and natural zeolite as an ionophore has shown a satisfactory result for the direct potentiometric measurement of chromium(VI) in the presence of Cu 2+ and Fe 3+ , which may have the potential to be used in real sample analysis.

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Synthesis and performance evaluation of diphenylcarbazide functionalized mesoporous silica for selective removal of Cr(VI)

Cited by 12 publications

References 66 publications

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

Kinetic, Isotherm, and Equilibrium Investigation of Cr(VI) Ion Adsorption on Amine-Functionalized Porous Silica Beads

Potentiometric sensor for chromium(VI) using a composite of diphenylcarbazide-natural zeolite-modified membrane electrodes

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