Application of Taguchi robust design to the optimization of the synthesis of holmium carbonate and oxide nanoparticles and exploring their photocatalyst behaviors for water treatment

Rahimi‐Nasrabadi, Mehdi; Pourmortazavi, Seied Mahdi; Aghazadeh, Mustafa; Karimi, Meisam Sadeghpour; Norouzi, Parviz

doi:10.1007/s10854-017-6932-4

Cited by 3 publications

(2 citation statements)

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“…All the support materials of Au/LREO were determined to be the composites of rare-earth oxides (RE 2 O 3 ) and rare-earth oxycarbonates (RE 2 O 2 CO 3 ). RE 2 O 2 CO 3 is a kind of layered compound with CO 3 2– anions separating the (RE 2 O 2 ) 2+ layers. − The appearance of RE 2 O 2 CO 3 compounds can be attributed to the exchange of intercalated NO 3 – in LREHs to CO 3 2– anions that were released from the hydrolyzed CO(NH 2 ) 2 and further calcination at 400 °C. For instance, Au/LPrO showed the typical peaks of both Pr 2 O 2 CO 3 and Pr 6 O 11 , which are shown in Figure A.…”

Section: Results and Discussionmentioning

confidence: 99%

“…In this region, the DTG curve shows a maximum mass loss rate at 512 °C. Between 555 and 830 °C, the third stage exhibits a steep and rapid weight loss of 3.4% at 622 °C owing to the conversion of Pr 2 O 2 CO 3 to Pr 6 O 11 . − Eventually, the TG curve becomes stable above 830 °C. The TG–DTG curve for the Au/LYO sample in Figure D shows the similar three decomposition stages to Au/LPrO between 30 and 900 °C, indicating the coexistence of Au, Y 2 O 3 , and Y 2 O 2 CO 3 .…”

Section: Results and Discussionmentioning

confidence: 99%

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Gold Nanoparticles on Nanosheets Derived from Layered Rare-Earth Hydroxides for Catalytic Glycerol-to-Lactic Acid Conversion

Wang

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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Layered rare-earth hydroxides (LREHs), as a series of special lamellar compounds having a similar structure to layered double hydroxides (LDHs), are becoming a new type of catalyst materials. In this study, we have prepared a series of uniform LREH (RE = Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm) nanosheets through a reverse-microemulsion method. After deposition–precipitation of HAuCl4 and calcination, supported Au catalysts (denoted as Au/LREO) were subsequently obtained. The catalytic properties of all the derived Au/LREO catalysts were evaluated by aerobic conversion of glycerol to lactic acid under mild conditions (90 °C, 1 atm). Among these catalysts, Au/LPrO displays the best performances, including the highest glycerol conversion, lactic acid, and C3 product selectivity. Both the catalytic activities and the characterizations of the structure of Au/LREO indicate that the kind of rare-earth ions plays a key role in determining the Au particle size and its valence state and reducibility, which are the important factors correlated with the catalytic activities in glycerol conversion. In fact, the three features of gold particles, the extra-small size (∼3 nm), high content of Au0 species, and high reducibility, are the essential prerequisites for achieving the superior catalytic performance of Au/LPrO.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Gold Nanoparticles on Nanosheets Derived from Layered Rare-Earth Hydroxides for Catalytic Glycerol-to-Lactic Acid Conversion

Wang

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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Highly Sensitive Determination of Theophylline Based on Graphene Quantum Dots Modified Electrode

Ganjali¹

2018

International Journal of Electrochemical Science

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In this study we introduce a novel modification for the surface of screen-printed electrode (SPE) by graphene quantum dot (GQD) in order to be used in the determination and detection of theophylline. An uncomplicated technique was employed to stabilize GQD on screen-printed electrode. Function evaluation of the GQD modified SPE (GQD/SPE) by cyclic voltammetry revealed enhanced electroactivity in the oxidation of theophylline in buffer solution of phosphate. Differential-pulse voltammetry (DPV), cyclic voltammetry (CV) and chronoamperometry were applied to determine the sensitivity of GQD/SPE toward detection of theophylline. A wide linear concentration range of 1.0-700.0 μM and detection limit of 0.2 μM (S/N = 3) obtained under optimized conditions. This sensor was successful in the assessment of theophylline in real samples.

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Voltammetric Determination of Dopamine Using Glassy Carbon Electrode Modified with ZnO/Al2O3 Nanocomposite

Ganjali¹

2018

International Journal of Electrochemical Science

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In this work, a new modification strategy was reported to modify a glassy carbon electrode (GCE) based on ZnO/Al 2 O 3 nanocomposite. This modified electrode was designed in order to be used as a sensitive and selective sensor towards detection of trace amount of dopamine (DA). The effective parameters on the optimal performances of the electrode such as pH of the test solution and the applied scan rate during the electrochemical process were also studied. This sensor responded linearly towards detection of dopamine within a wide range of 5.0×10 −6 -7.0×10 −4 M with a low detection limit of 2.0×10 − 6 M (pH=7.0), under the optimum conditions. Moreover, the electrode functioned in the determination of dopamine in real samples was satisfactory.

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Application of Taguchi robust design to the optimization of the synthesis of holmium carbonate and oxide nanoparticles and exploring their photocatalyst behaviors for water treatment

Cited by 3 publications

References 31 publications

Gold Nanoparticles on Nanosheets Derived from Layered Rare-Earth Hydroxides for Catalytic Glycerol-to-Lactic Acid Conversion

Gold Nanoparticles on Nanosheets Derived from Layered Rare-Earth Hydroxides for Catalytic Glycerol-to-Lactic Acid Conversion

Highly Sensitive Determination of Theophylline Based on Graphene Quantum Dots Modified Electrode

Voltammetric Determination of Dopamine Using Glassy Carbon Electrode Modified with ZnO/Al2O3 Nanocomposite

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