Synthesis and characterization of modified sulfonated chitosan for beryllium recovery

El-Soad, A.M. Abu; El‐Magied, Mahmoud O. Abd; Atrees, Mohamed S.; Kovaleva, Elena G.; Lazzara, Giuseppe

doi:10.1016/j.ijbiomac.2019.07.162

Cited by 26 publications

(18 citation statements)

References 53 publications

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“…According to the data obtained from elemental analysis, the greatest degree of grafting was achieved by using the molar ratio 1:1:3. As reported in our recent work, the effect of HNT/silane molar ratio on silanization of HNTs using (3-aminopropyl) triethoxy silane and (3-mercaptopropyl) trimethoxy silane was studied, and the results reveal that the degree of grafting of silane onto the HNT surface decreased as the number of moles of silane increased [2,18,35]. In the present work, it was found that for a HNTs:CPTMS:H 2 O molar ratio equal to 1:1:3, a larger degree of grafting is obtained (Table 1).…”

Section: Effect Of Hnts:cptms:h 2 O Molar Ratiomentioning

confidence: 55%

“…The degree of grafting of CPTMS onto HNTs using ethanol, toluene, tetrahydrofuran, 1,4-dioxane, and n-hexane was 10.75, 24.29, 11, 14.3, and 15.32%, respectively. Relying on the data obtained from elemental analysis, it was found that toluene is the most effective solvent for the grafting of (3-chloropropyl) trimethoxy silane onto the HNT surface [18,30].…”

Section: Effect Of Solventmentioning

confidence: 99%

“…Compared to other tube-shaped materials such as boron nitride, metal oxide, and carbon nanotubes, halloysite gains attention as an attractive and appropriate material for nanotechnology applications because of its nature and its availability [4,[7][8][9][10][11][12][13]. Halloysite mineral surfaces can be altered using different methods, i.e., adsorption, grafting with organic compounds, and ion exchange using inorganic/ organic cations [14][15][16][17][18]. One of these methods that can be used to modify the halloysite nanotube surface is the grafting of silane, improving HNTs' clay dispersion in polymeric, fluidic materials [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Halloysite mineral surfaces can be altered using different methods, i.e., adsorption, grafting with organic compounds, and ion exchange using inorganic/ organic cations [14][15][16][17][18]. One of these methods that can be used to modify the halloysite nanotube surface is the grafting of silane, improving HNTs' clay dispersion in polymeric, fluidic materials [18,19]. It is worth noting that halloysite nanotubes have garnered great interest as polymeric fillers due to their reinforcing ability, but also due to the possibility of controlled release of active ingredients for packaging applications and drug delivery [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Grafting of (3-Chloropropyl)-Trimethoxy Silane on Halloysite Nanotubes Surface

et al. 2021

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Modified halloysite nanotubes (HNTs-Cl) were synthesized by a coupling reaction with (3-chloropropyl) trimethoxysilane (CPTMS). The incorporation of chloro-silane onto HNTs surface creates HNTs-Cl, which has great chemical activity and is considered a good candidate as an active site that reacts with other active molecules in order to create new materials with great applications in chemical engineering and nanotechnology. The value of this work lies in the fact that improving the degree of grafting of chloro-silane onto the HNT’s surface has been accomplished by incorporation of HNTs with CPTMS under different experimental conditions. Many parameters, such as the dispersing media, the molar ratio of HNTs/CPTMS/H2O, refluxing time, and the type of catalyst were studied. The greatest degree of grafting was accomplished by using toluene as a medium for the grafting process, with a molar ratio of HNTs/CPTMS/H2O of 1:1:3, and a refluxing time of 4 h. The addition of 7.169 mmol of triethylamine (Et3N) and 25.97 mmol of ammonium hydroxide (NH4OH) led to an increase in the degree of grafting of CPTMS onto the HNT’s surface.

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Section: Effect Of Hnts:cptms:h 2 O Molar Ratiomentioning

confidence: 55%

Section: Effect Of Solventmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Grafting of (3-Chloropropyl)-Trimethoxy Silane on Halloysite Nanotubes Surface

et al. 2021

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“…Leaching kinetics for different metal ions from different ores was discussed recently, such as batch leaching of Canada uranium ore [17] . In Egypt, some efforts have been accomplished to leach uranium and associated lanthanides from El ‐Sela ores materials [18,19] …”

Section: Introductionmentioning

confidence: 99%

Recovery of uranium from ferruginous Shale mineralization from Um Bogma formation, Egypt, via Duolite ES‐467 chelating resin

Radwan

Gado

El–Wahab

et al. 2021

Zeitschrift anorg allge chemie

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The ferruginous shale iron content (27.5 %) is a serious problem that prevents the separation of uranium. Chemical dissolution of the ferruginous shale from Um Bogma Formation, Egypt, has been studied for the recovery of uranium using the acidic leaching method. Um Bogma representative sample assays 700 ppm of uranium as the element of interest. The effective dissolution parameters such as acid concentrations, solid/liquid addition ratio, leaching time, and leaching temperature were planned to investigate. It was found that The dissolution rate was greatly influenced by the studied dissolution factors. Analysis of the kinetic data showed that the dissolution mechanism is fitted well to shrinking core model within chemical reaction as a rate determining step. It was found that the recorded activation energy (Ea) of uranium dissolution is 205 kJ/mol. The uranium dissolution efficiency of 95.2 % has been achieved with optimized conditions of 250 g/L H2SO4; 1 : 7 (S/L) phase ratio; 250 °C for 7 hours. Finally, the best‐controlling factors were applied for uranium separation from Um Bogma leach liquor to produce a uranium concentrate with 69.985 % uranium purity.

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High adsorption performance of Cr(VI) ions from the electroplating waste solution using surface‐modified porous poly 2‐((methacryloxy)methyl)oxirane polymers

Alharthi

Alharthy

Manaa

et al. 2022

Zeitschrift anorg allge chemie

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The stainless steel waste solutions, produced during the electroplating process, were found to contain high chromium content (43.52 g/L). To avoid environmental chromium contamination and chromium toxicity, these wastes must be treated. In this work, new surface‐modified porous poly‐2‐((methacryloxy)‐methyl)‐oxirane polymers were synthesized, characterized, and then used to recover Cr (VI) from electroplating waste solution. Based on the obtained results, Cr(VI) adsorption improved with time and initial metal ion concentration. The results indicate a favourable chemisorption process controlled by pseudo second‐order rate and intraparticle diffusion mechanisms. The used polymers are capable of disposing of Cr(VI) species from wastewater with a maximum adsorption capacity of 4.21 and 5.31 mmol/g for RI@EDA and HCl@RI@EDA, respectively. The used resins showed superior affinity and efficiency in removing Cr(VI) from the electroplating waste solution.

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Synthesis and characterization of modified sulfonated chitosan for beryllium recovery

Cited by 26 publications

References 53 publications

Grafting of (3-Chloropropyl)-Trimethoxy Silane on Halloysite Nanotubes Surface

Grafting of (3-Chloropropyl)-Trimethoxy Silane on Halloysite Nanotubes Surface

Recovery of uranium from ferruginous Shale mineralization from Um Bogma formation, Egypt, via Duolite ES‐467 chelating resin

High adsorption performance of Cr(VI) ions from the electroplating waste solution using surface‐modified porous poly 2‐((methacryloxy)methyl)oxirane polymers

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