scholarly journals Efficient Removal of Chromium(VI) Anionic Species and Dye Anions from Water Using MOF-808 Materials Synthesized with the Assistance of Formic Acid

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1398
Author(s):  
Khoa D. Nguyen ◽  
Phuoc H. Ho ◽  
Phuong D. Vu ◽  
Thuyet L. D. Pham ◽  
Philippe Trens ◽  
...  
Keyword(s):  
Formic Acid ◽  
Crystal Size ◽  
High Specific Surface Area ◽  
Particle Sizes ◽  
Ambient Conditions ◽  
Sunset Yellow ◽  
Anionic Dyes ◽  
Chromium Vi ◽  
Anionic Species ◽  
Quinoline Yellow

This study presents a simple approach to prepare MOF-808, an ultra-stable Zr-MOF constructed from 6-connected zirconium clusters and 1,3,5-benzene tricarboxylic acid, with tailored particle sizes. Varying the amount of formic acid as a modulator in the range of 200–500 equivalents results in MOF-808 materials with a crystal size from 40 nm to approximately 1000 nm. Apart from the high specific surface area, a combination of a fraction of mesopore and plenty of acidic centers on the Zr-clusters induces a better interaction with the ionic pollutants such as K2Cr2O7 and anionic dyes. MOF-808 shows uptakes of up to 141.2, 642.0, and 731.0 mg/g for K2Cr2O7, sunset yellow, and quinoline yellow, respectively, in aqueous solutions at ambient conditions. The uptakes for the ionic dyes are significantly higher than those of other MOFs reported from the literature. Moreover, the adsorption capacity of MOF-808 remains stable after four cycles. Our results demonstrate that MOF-808 is a promising ideal platform for removing oxometallates and anionic dyes from water.

scholarly journals Investigation of the aqueous adsorption capacity of a 6-connected Zr-MOF for anionic and cationic dyes in comparison with other traditional porous materials

2021 ◽  
Vol 947 (1) ◽  
pp. 012032
Author(s):  
Thuyet L.D. Pham ◽  
Khanh T.M. Le ◽  
Nhi T. Vo ◽  
Khoa D. Nguyen ◽  
HaV. Le
Keyword(s):  
Porous Materials ◽  
Adsorption Capacity ◽  
Cationic Dyes ◽  
Bet Surface Area ◽  
High Porosity ◽  
X Ray Diffraction ◽  
Sunset Yellow ◽  
Anionic Dyes ◽  
Surface Areas ◽  
Quinoline Yellow

Abstract A 6-connected Zr-MOF (MOF-808) was successfully synthesized via the solvothermal method with the assistance of formic acid (HCOOH). The resulting MOF showed high crystallinity and thermal stability, which was verified by powder X-ray diffraction (PXRD) measurement, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). As can be expected, the obtained material possessed high porosity with an extremely high specific BET surface area (SABet) of 2372 m2/g. The adsorption capacity of MOF-808 for anionic dyes (i.e. sunset yellow, quinoline yellow, and methyl orange) and cationic ones (i.e. methylene blue and malachite green) in aqueous solutions was respectively investigated. For comparison purpose, the adsorption experiments were also carried out using other traditional porous materials, including commercial microporous activated carbon and synthesized mesoporous SBA-15 with BET surface areas of 1030 m2/g and approximately 800 m2/g, respectively. It was demonstrated that the efficiency of MOF-808 in trapping anionic dyes in water was significantly higher while carbon and silica materials exhibited better performances for the case of cationic dyes.

Study of aerobic oxidation of phenyl PtII complexes (dpms)PtIIPh(L) (dpms = di(2-pyridyl)methanesulfonate; L = water, methanol, or aniline)

2009 ◽  
Vol 87 (1) ◽  
pp. 110-120 ◽  
Author(s):  
Julia R Khusnutdinova ◽  
Peter Y Zavalij ◽  
Andrei N Vedernikov
Keyword(s):  
Aqueous Solution ◽  
Aerobic Oxidation ◽  
Reductive Elimination ◽  
High Yield ◽  
Ambient Conditions ◽  
Activation Barriers ◽  
Methanol Solutions ◽  
Anionic Species ◽  
Mechanism Of Oxidation ◽  
Solution Mechanism

Oxidation of phenyl PtII complexes K[(dpms)PtIIPh2], 1, (dpms)PtIIPh(MeOH), 2, (dpms)PtIIPh(OH2), 3, and methyl PtII complex (dpms)PtIIMe(NH2Ph), 6, with O2 in aqueous or methanol solutions under ambient conditions leads to corresponding (dpms)PtIVR(X)OH complexes (R = X = Ph, 7; R = Ph, X = OH, 8; R = Ph, X = OMe, 9; R = Me, X = NHPh; 11; dpms = di(2-pyridyl)methanesulfonate). Complexes 7–9 could be isolated in high yield. Complex 11 as well as its phenyl analogue (dpms)PtIVPh(NHPh)OH, 10 can be prepared in high yield by oxidation of corresponding (dpms)PtIIR(NH2Ph) with H2O2 in methanol. Phenyl PtII complexes (dpms)PtIIPh(HX) derived from HX = aniline and DMSO, 4 and 5, respectively, are inert toward O2. The rate of oxidation of 1–5 with O2 decreases in the order 1 > 3 ~ 2 » 4, and 5 is unreactive. Methyl analogues are significantly more reactive compared with their phenyl counterparts. Proposed mechanism of oxidation with O2 includes formation of anionic species (dpms)PtIIR(X)– responsible for reaction with dioxygen. Attempts at C–O and C–N reductive elimination from phenyl PtIV complexes 7–10 do not lead to phenyl derivatives PhX at 80–100 °C, consistent with the results of the DFT estimates of corresponding activation barriers, ΔG0 exceeding 28 kcal/mol.Key words: platinum phenyl complexes, oxidation, dioxygen, aqueous solution, mechanism.

scholarly journals Quaternization of Poly(2-diethyl aminoethyl methacrylate) Brush-Grafted Magnetic Mesoporous Nanoparticles Using 2-Iodoethanol for Removing Anionic Dyes

2021 ◽  
Vol 11 (21) ◽  
pp. 10451
Author(s):  
Khalid Mohammed Alotaibi ◽  
Abdurrahman A. Almethen ◽  
Abeer M. Beagan ◽  
Hassan M. Al-Swaidan ◽  
Ashfaq Ahmad ◽  
...  
Keyword(s):  
Mesoporous Silica Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
Polymer Chains ◽  
Sunset Yellow ◽  
Anionic Dyes ◽  
Solution Ph ◽  
Effects Of Ph ◽  
Weak Adsorption ◽  
Ph Level

Magnetic mesoporous silica nanoparticles (Fe3O4-MSNs) were successfully synthesized with a relatively high surface area of 568 m2g−1. Fe3O4-MSNs were then modified with poly(2-diethyl aminoethyl methacrylate) (PDEAEMA) brushes using surface-initiated ARGET atom transfer radical polymerization (ATRP) (Fe3O4@MSN-PDMAEMA). Since the charge of PDEAEMA is externally regulated by solution pH, tertiary amines in the polymer chains were quaternized using 2-iodoethanol to obtain cationic polymer chains with a permanent positive charge (Fe3O4@MSN-QPDMAEMA). The intensity of the C−O peak in the C1s X-ray photoelectron spectrum increased after reaction with 2-iodoethanol, suggesting that the quaternization process was successful. The applicability of the synthesized materials on the removal of methyl orange (MO), and sunset yellow (E110) dyes from an aqueous solution was examined. The effects of pH, contact time, and initial dyes concentrations on the removal performance were investigated by batch experiments. The results showed that the Fe3O4@MSN-PDMAEMA sample exhibited a weak adsorption performance toward both MO and E110, compared with Fe3O4@MSN-QPDMAEMA at a pH level above 5. The maximum adsorption capacities of MO and E110 using Fe3O4@MSN-QPDMAEMA were 294 mg g−1 and 194.8 mg g−1, respectively.

scholarly journals Structurally ordered Pt–Zn/C series nanoparticles as efficient anode catalysts for formic acid electrooxidation

2015 ◽  
Vol 3 (44) ◽  
pp. 22129-22135 ◽  
Author(s):  
Jing Zhu ◽  
Xin Zheng ◽  
Jie Wang ◽  
Zexing Wu ◽  
Lili Han ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
Particle Sizes ◽  
Anode Catalysts ◽  
Formic Acid Electrooxidation

Structurally ordered Pt3Zn and PtZn nanoparticles with ultrasmall particle sizes were obtained and exhibited enhanced catalytic activity toward HCOOH electrooxidation.

Photo enhanced detoxification of chromium (VI) by formic acid using 3D palladium nanocatalyst

2017 ◽  
Vol 338 ◽  
pp. 115-122 ◽  
Author(s):  
Uddhav S. Markad ◽  
Ajit M. Kalekar ◽  
Devidas B. Naik ◽  
Kiran Kumar K. Sharma ◽  
Krushna J. Kshirasagar ◽  
...  
Keyword(s):  
Formic Acid ◽  
Chromium Vi

scholarly journals Environmentally Friendly Mesoporous Nanocomposite Prepared from Al-Dross Waste with Remarkable Adsorption Ability for Toxic Anionic Dye

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Inas A. Ahmed ◽  
Najlaa S. Al-Radadi ◽  
H. S. Hussein ◽  
Ahmed H. Ragab
Keyword(s):  
Crystal Size ◽  
Pore Radius ◽  
Morphological Properties ◽  
Anionic Dyes ◽  
Adsorption Ability ◽  
Waste Products ◽  
X Ray ◽  
Anionic Dye ◽  
Eriochrome Black T ◽  
Adsorption Desorption

In this work, a mesoporous nanocomposite composed of nanogibbsite (α-Al(OH)3) and nanosilica was prepared. Gibbsite nanoparticles (GNPs) with a crystal size of ≈38 nm were prepared from Al-dross industrial waste products in an acidic environment at 100°C. Nanosilica (NS) with a crystal size of ≈13 nm was prepared from sodium silicate using dilute hydrochloric acid. The deposition of nanosilica onto gibbsite particles was investigated. The mesoporous silica-gibbsite (NSG) nanocomposite was examined by evaluating its ability to adsorb the toxic anionic dye Eriochrome black T (EBT) from aqueous solution. The compositional and morphological properties of NSG nanocomposites were studied by means of the FTIR spectroscopy, X-ray fluorescence (XRF), XRD, SEM, and TEM techniques. The effect of dye concentration, pH, adsorbent dose, contact time, and temperature was investigated. The sorption models, the isotherms, and the thermodynamic parameters ΔHo, ΔGo, and ΔSo were evaluated. The N2 adsorption-desorption isotherms revealed that mixing the two prepared materials (NS and GNPs) to form the NSG nanocomposite resulted in good properties (a surface area of 62.34 m2·g−1, a pore radius of 22.717 nm, and a pore volume of 0.7081 cm3·g−1). The results show that the prepared NSG nanocomposite has a remarkable ability to adsorb toxic anionic dyes.

scholarly journals Support effect for nanosized Au catalysts in hydrogen production from formic acid decomposition

2016 ◽  
Vol 6 (18) ◽  
pp. 6853-6860 ◽  
Author(s):  
Monika Zacharska ◽  
Andrey L. Chuvilin ◽  
Vladimir V. Kriventsov ◽  
Sergey Beloshapkin ◽  
Miguel Estrada ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Formic Acid ◽  
Support Effect ◽  
Particle Sizes ◽  
Acid Decomposition ◽  
Formic Acid Decomposition

Au catalysts with the same particle sizes demonstrate the following order of activity in formic acid decomposition: Au/Al2O3 > Au/ZrO2 ∼ Au/CeO2 > Au/La2O3 > Au/MgO.

Cooxidation of formic acid and oxalic acid by chromium(VI) in aqueous acid media: a kinetic study

2001 ◽  
Vol 2001 (8) ◽  
pp. 334-335 ◽  
Author(s):  
Asim K. Das ◽  
Aparna Roy ◽  
Bidyut Saha ◽  
Mahua Das
Keyword(s):  
Oxalic Acid ◽  
Formic Acid ◽  
Kinetic Study ◽  
Acid Media ◽  
Aqueous Acid ◽  
Chromium Vi
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