Journal ArticleDOI
Sensitive voltammetric determination of bromate by using ion-exchange property of a Sn(II)-clinoptilolite-modified carbon paste electrode
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In this paper, a modified carbon paste electrode with Sn(II)-exchanged clinoptilolite nanoparticles (CNP-Sn(I)-CPE) showed voltammetric current (in cyclic voltammetry (CV)) for Sn (II)/Sn(IV) in sulfuric acid electrolyte (pH 2), the peak current was decreased when bromate was added to the solution.Abstract:
A modified carbon paste electrode with Sn(II)-exchanged clinoptilolite nanoparticles (CNP-Sn(II)-CPE) showed voltammetric current (in cyclic voltammetry (CV)) for Sn(II)/Sn(IV) in sulfuric acid electrolyte (pH 2). The peak current was decreased when bromate was added to the solution. Hence, this decrease was used for indirect voltammetric determination of bromate. In designed experiments using response surface methodology (RSM) approach in square-wave voltammetry (SqW), strong acidic pH values (pH 1.8–2.5) caused an increased SqW voltammetric response, because such pH values bring sufficient Sn(II) as the electroactive species at the electrode surface via ion-exchange process. The optimal variables obtained are sulfuric acid as supporting electrolyte at pH 1.80, modifier% at 25, amplitude at 498.4 mV, step potential at 5.4 mV, and frequency at 25 Hz. The peak current of Sn(II)/Sn(IV) redox pair was inversely proportionate to the concentration of bromate. Hence, ΔI (difference in peak current in the absence and presence of bromate) was proportionally increased with increasing the concentration of bromate in the range of 5.00 to 100.00 μmol L−1 with a detection limit of 0.06 μmol L−1 bromate. The effect of some strong oxidizing agents was studied, and the results showed that when such agents are present at levels of 2.5 to 5 times greater than the bromate in the solution, they can cause a maximum error of 3% in the determination of bromate in sulfuric acid electrolyte at pH 2.5.read more
Citations
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Utilization of rice husk and waste aluminum cans for the synthesis of some nanosized zeolite, zeolite/zeolite, and geopolymer/zeolite products for the efficient removal of Co(II), Cu(II), and Zn(II) ions from aqueous media.
TL;DR: The synthesized products were efficiently applied for removing Co(II, Cu(II), and Zn(II) ions from aqueous media and wastewater which was taken from Abuzaabal- Qalyubiyah-Egypt and fitted well with the Langmuir isotherm and pseudo-2nd-order kinetic model.
Journal ArticleDOI
A statistical modeling-optimization approach for efficiency photocatalytic degradation of textile azo dye using cerium-doped mesoporous ZnO: A central composite design in response surface methodology
TL;DR: In this paper, a new modeling approach of central composite design (CCD) in Response Surface methodology (RSM) was investigated for the optimization of methyl orange (MO) photodegradation based to the prepared materials under UV-vis irradiation.
Journal ArticleDOI
Efficient removal of Pb(II) ions from aqueous solution by modified red mud.
TL;DR: The advertisementsorption experiments found that the adsorption capacity of the modified red mud for Pb(II) ions was significantly improved, almost 10 times as much as that of the original red mud.
Journal ArticleDOI
NiO nanoparticles decorated hexagonal Nickel-based metal-organic framework: Self-template synthesis and its application in electrochemical energy storage
TL;DR: The results indicate the potential of Ni-MOF@NiO composite as an electrode material for application in supercapacitors and can be used to synthesize other MOF@metal oxide materials for electrochemical energy storage and other related applications.
Journal ArticleDOI
Preparation and application of Mg–Al composite oxide/coconut shell carbon fiber for effective removal of phosphorus from domestic sewage
TL;DR: A simple and cheap adsorbent using waste coconut shell fiber (CSF) as the biomass carbon precursor was successfully prepared with the in-situ growth of Mg-Al composite oxide and the resulting Mg−Al/CSF with fractional structure was used for the removal of phosphorus from wastewater as mentioned in this paper.
References
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