Preparation of novel heterogeneous catalysts by adsorption of a cationic tetrapyrrole on to bentonite: equilibrium, kinetics, and thermodynamics

Sevim, Altuğ Mert; Hojiyev, Rustam; Gül, Ahmet; Çelik, M.S.

doi:10.1007/s00706-011-0599-y

Cited by 11 publications

(6 citation statements)

References 39 publications

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“…In Figure d, the bands of 3300–3450 cm –1 show the moisture bonded to the surface of nano-MMT which contains about 10% water in its structure. These data have previously been reported by Sevim et al as well, who explained the relationship between the bending peak at 1639 cm –1 (Figure c,d) and the wide and flat peak at 3623 cm –1 belonging to deformation and bending of water molecules.…”

Section: Resultssupporting

confidence: 90%

“…Stresses at wavelengths of 1115, 909, and 979 cm −1 are caused by −Si, −O, and −Si−O−Si, respectively (Figure 5c,d). Finally, as also mentioned in the literature, 42,43 deformation of the groups containing Mg, Fe, and Al atoms of clay are observed at 717 and 791 cm −1 which are presented in Figure 5c but not in Figure 5d. It could be concluded that although clay structure is amorphized in the attritor, characteristic clay spectra are presented in nano-MMT samples.…”

Section: Ee%supporting

confidence: 71%

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Enhancing the Kinetic Stability of Polymeric Nanomicelles (PLGA) Using Nano-Montmorillonite for Effective Targeting of Cancer Tumors

et al. 2022

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The toxic profile of chemical cross-linkers used in enhancing the stability of self-assembled nanomicelles made of amphiphilic polymeric materials hinders their use in clinical applications. This study was aimed to use the layered structure of Na-montmorillonite (MMT) as a stabilizer for nanomicelles made of poly(d,l-lactide-co-glycolide) (PLGA) amphiphilic polymer. The size of Na-MMT was reduced below 40 nm (nano-MMT) by processing in an attritor prior to its incorporation with PLGA. Hybrid PLGA nano-MMT (PM) nanoparticles (NPs) were prepared using dialysis nanoprecipitation. The size distribution was measured using dynamic light scattering (DLS). Loading 1250 μg of the model drug molecule curcumin to PM (PMC) resulted in obtaining 88 nm-sized particles, suitable for passive targeting of cancer tumors. The structure of nano-MMT and its position in PMC were investigated using FT-IR, differential scanning chalorimetry (DSC), XRF, XRD, ESEM, and EDAX assays, all of which showed the exfoliated structure of nano-MMT incorporated with both hydrophilic and hydrophobic blocks of PLGA. Curcumin was mutually loaded to PLGA and nano-MMT. This firm incorporation caused a serious extension in the release of curcumin from PMC compared to PLGA (PC). Fitting the release profile to different mathematical models showed the remarkable role of nano-MMT in surface modification of PLGA NPs. The ex vivo dynamic model showed the enhanced stability of PMC in simulated blood flow, while cytotoxicity assays showed that nano-MMT does not aggravate the good toxic profile of PLGA but improves the anticancer effect of payload. Nano-MMT could be used as an effective nontoxic stabilizer agent for self-assembled NPs.

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Section: Resultssupporting

confidence: 90%

Section: Ee%supporting

confidence: 71%

Enhancing the Kinetic Stability of Polymeric Nanomicelles (PLGA) Using Nano-Montmorillonite for Effective Targeting of Cancer Tumors

et al. 2022

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“…The activated sodium bentonite shows the stretching vibration of structural O-H groups at 3645 cm −1 , structural Si-O groups at 1103, 999 and 789 cm −1 , structural Al-Al-OH groups at 902 cm −1 , structural Al-Fe-OH groups at 883 cm −1 , the free and interlayer water in bond stretching vibration at 3396 cm −1 , and adsorbed water-yielded bending at 1643 cm −1 [52][53][54][55].…”

Section: Coagulants Characterizationmentioning

confidence: 99%

Combination of Coagulation–Flocculation–Decantation and Ozonation Processes for Winery Wastewater Treatment

Jorge

Teixeira

Matos

et al. 2021

IJERPH

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This research assessed a novel treatment process of winery wastewater, through the application of a chemical-based process aiming to decrease the high organic carbon content, which represents a difficulty for wastewater treatment plants and a public health problem. Firstly, a coagulation–flocculation–decantation process (CFD process) was optimized by a simplex lattice design. Afterwards, the efficiency of a UV-C/ferrous iron/ozone system was assessed for organic carbon removal in winery wastewater. This system was applied alone and in combination with the CFD process (as a pre- and post-treatment). The coagulation–flocculation–decantation process, with a mixture of 0.48 g/L potassium caseinate and 0.52 g/L bentonite at pH 4.0, achieved 98.3, 97.6, and 87.8% removals of turbidity, total suspended solids, and total polyphenols, respectively. For the ozonation process, the required pH and ferrous iron concentration (Fe2+) were crucial variables in treatment optimization. With the application of the best operational conditions (pH = 4.0, [Fe2+] = 1.0 mM), the UV-C/ferrous iron/ozone system achieved 63.2% total organic carbon (TOC) removal and an energy consumption of 1843 kWh∙m−3∙order−1. The combination of CFD and ozonation processes increased the TOC removal to 66.1 and 65.5%, respectively, for the ozone/ferrous iron/UV-C/CFD and CFD/ozone/ferrous iron/UV-C systems. In addition, the germination index of several seeds was assessed and excellent values (>80%) were observed, which revealed the reduction in phytotoxicity. In conclusion, the combination of CFD and UV-C/ferrous iron/ozone processes is efficient for WW treatment.

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“…For this purpose, suitable supports such as charcoal [15], organic polymers [16], clays [17,18], silica [19] and zeolites [20] have been tested. If they are fixed onto a suitable supporting material, this drawback can be overcome.…”

Section: Introductionmentioning

confidence: 99%

“…If they are fixed onto a suitable supporting material, this drawback can be overcome. For this purpose, suitable supports such as charcoal [15], organic polymers [16], clays [17,18], silica [19] and zeolites [20] have been tested. In comparison with these materials, fabrics and fibres may be preferable candidates because they are easy to handle and they can also be modified structurally by means of well‐established physical and chemical techniques.…”

Section: Introductionmentioning

confidence: 99%

Novel water‐soluble metallophthalocyanines supported on cotton fabric

Yıldırım

Sevim

Gül

2012

Coloration Technology

Self Cite

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In this study, two novel phthalonitrile derivatives were firstly prepared starting from 4-nitrophthalonitrile: substitution of the nitro group with 3-mercaptopropionic acid and 4-mercaptobenzoic acid gave two precursors, namely, 4-(carboxyethylsulphanyl) phthalonitrile and 4-(carboxyphenylsulphanyl)phthalonitrile. Zinc(II), copper(II) and cobalt(II) metallophthalocyanines bearing four carboxylic acid groups on the periphery were prepared by cyclotetramerisation of the new precursors in the presence of the corresponding divalent metal salts. The new compounds were characterised by elemental analyses, infrared, ultraviolet-visible, mass and proton nuclear magnetic resonance techniques. All these newly synthesised water-soluble metallophthalocyanine derivatives were supported on cationic cotton fabrics in the presence of ammonia solution and sodium hydroxide and the dyeing effectiveness, levelness and fastness of these novel dyed fabrics were investigated. These novel dyed fabrics are considered to be useful in the textile industry and also in optical and catalytic applications, especially for air-purifying materials in air conditioners.

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Preparation of novel heterogeneous catalysts by adsorption of a cationic tetrapyrrole on to bentonite: equilibrium, kinetics, and thermodynamics

Cited by 11 publications

References 39 publications

Enhancing the Kinetic Stability of Polymeric Nanomicelles (PLGA) Using Nano-Montmorillonite for Effective Targeting of Cancer Tumors

Enhancing the Kinetic Stability of Polymeric Nanomicelles (PLGA) Using Nano-Montmorillonite for Effective Targeting of Cancer Tumors

Combination of Coagulation–Flocculation–Decantation and Ozonation Processes for Winery Wastewater Treatment

Novel water‐soluble metallophthalocyanines supported on cotton fabric

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