Sequestration of CO 2 using Cu nanoparticles supported on spherical and rod-shape mesoporous silica

Khdary, Nezar H.; Ghanem, Mohamed A.; Abdesalam, Mamduoh E.; Al-Garadah, Mohamed M.

doi:10.1016/j.jscs.2016.05.004

Cited by 31 publications

(14 citation statements)

References 42 publications

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“…demonstrate the need for basic pH to achieve high copper loading under our synthesis conditions; even in the weakly acidic solution at pH 5.4, little copper was found in the product. In contrast, the Cu-silica-10.4 sample had a high copper loading of 31.5 wt%; much higher than many previous reports using wet chemical techniques that typically achieve around 10 wt.%[15,[65][66][67][68][69]. Previous investigations of pH-dependent metal loading on silica that achieved copper loadings above 30 wt.% have formed Cu-PS structures [10, 58, 70, 71], consistent with our results.…”

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confidence: 90%

Controlling the morphology of copper-silica nanocomposites from laser ablation in liquid

John

Tibbetts

2020

Applied Surface Science

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Synthesis of copper-silica nanocomposites with controllable morphology and composition were produced with a one-step femtosecond reactive laser ablation in liquid (fs-RLAL) technique. The composite nanomaterials were generated by focusing femtosecond near-IR laser pulses onto a silicon wafer immersed in an aqueous copper(II) nitrate solution, with the solution pH adjusted using nitric acid or potassium hydroxide. Under acidic conditions (pH 3.0 and 5.4), little copper was incorporated in the predominantly silica product (1.4 and 1.5 wt.%). These acidic conditions yielded large ~30-80 nm silica particles, with some particles consisting of copper core/silica shell. In contrast, increasing the solution pH to 10.4 resulted in extremely high Cu loading of 31.5 wt.% and a composite product consisting of 1.5 nm copper clusters distributed throughout a matrix of amorphous silica and copper phyllosilicate. The relationship between the precursor solution pH and the product morphology and copper loading is attributed to the point of zero charge (PZC) of silica, in which the high solution pH allows for electrostatic adsorption to occur between the deprotonated silica clusters from the ablated silicon wafer and the copper hydroxide dimer formed in solution. File list (2) download file view on ChemRxiv CuSiO2_v7.pdf (4.09 MiB) download file view on ChemRxiv sicu_SI.pdf (1.16 MiB)

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confidence: 90%

Controlling the morphology of copper-silica nanocomposites from laser ablation in liquid

John

Tibbetts

2020

Applied Surface Science

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“…Mesoporous silica (MSN) is an uprising adsorbent that can be used to adsorb ammonia and can be apply for water treatment. The MSN shows an excellent results and can be apply in various field such as drug delivery (Zhou et al 2018), water purification (Karim et al 2012;Kango et al 2015;Nasreen et al 2018), and carbon dioxide sequestration (Khdary et al 2018). Eventhough, it stills new in water treatment area but this new technology shows a positive feedback.…”

Section: Introductionmentioning

confidence: 98%

Synthesis of Mesoporous Silica for Ammonia Adsorption in Aqueous Solution

Arifin¹,

Hasan²,

Kamarudin³

et al. 2018

JKUKM

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In this work, mesoporous silica (MSN) was synthesized and tested for ammonia adsorption. The synthesized MSN was characterized using the Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Brunauer-Emmett-Teller (BET). In the ammonia adsorption experimental, the mass of MSN was varied at 0.5, 1.0, 1.5, 2.0 and 2. 5 g. The data of ammonia uptake by MSN was plotted using Langmuir and Freundlich isotherms, while the kinetic adsorptions were determined using pseudo-first order and pseudo-second order kinetics. The results showed the MSN structural was hexagonal form and particle size of 70 to 150 nm. Characterization using FTIR shows the MSN contained various chemical functional groups. The adsorption of ammonia rest resulted with a high percentage of ammonia removal. At 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 g of MSN, the highest adsorption uptake at 5 minutes were 0. 79, 0.42, 0.31, 0.21, 0.17 and 0.12 mg/g, respectively. The adsorption data were fitted to the isotherm and kinetic models to predict the mechanism and kinetic characteristics of the adsorption process. The Freundlich isotherm model shows the highest correlation with the Freunclidh (K F ) and adsorption constant (n) of 6.78 and 0.39 mg/g, respectively. For the kinetic modeling, the data of ammonia adsorption process were well fitted to the pseudo-second order with coefficient determination (R 2 ) value of 0.9992. These results indicated the potential for a new application of MSN as an effective adsorbent for ammonia removal and it can be applied in the water treatment processes. Brunauer-Emmett-Teller (BET). Dalam uji kaji penjerapan ammonia, jisim MSN diubah pada 0.5, 1.0, 1.5, 2.0 dan 2. 5 g. Data pengambilan ammonia oleh MSN telah diplot menggunakan isoterma Langmuir dan Freundlich, sementara kinetik penjerapan telah ditentukan dengan menggunakan kinetik urutan pseudopertama dan kinetik urutan pseudo-kedua. Keputusan menunjukkan struktur MSN adalah berbentuk heksagon dengan saiz partikel antara 70 -150 nm. Pencirian melalui FTIR pula menunjukkan MSN mempunyai pelbagai kumpulan kimia berfungsi. Saiz liang MSN yang besar telah menghasilkan peratusan penyingkiran ammonia yang tinggi. Pada jisim MSN sebanyak 0.5, 1.0, 1.5, 2.0, 2.5 dan 3.0 g, 0.42, 0.31, 0.21, 0.17 and 0.12 mg/g. Data penjerapan diplot pada model isoterma dan kinetik untuk meramalkan mekanisme dan ciri-ciri kinetik proses penjerapan ammonia. Model isoterma Freundlich menunjukkan korelasi tertinggi dengan pemalar Freunclidh (K F ) dan penjerapan (n) masing-masing sebanyak 6.78 dan 0.39 mg/g. Pemodelan kinetik menunjukkan data penjerapan ammonia berpadanan dengan pesanan pseudo-kedua dengan nilai penentuan koefisien (R 2 ) sebanyak 0.9992. Ini menunjukkan potensi aplikasi MSN sebagai penjerap berkesan untuk penyingkiran ammonia dan boleh diaplikasikan dalam proses rawatan air. ABSTRAK Dalam kajian ini, silika mesoliang (MSN) telah disintesis dan diuji untuk penjerapan ammonia. Pencirian terhadap MSN dilakukan dengan menggunakan ...

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“…The solution temperature was increased to 90 • C, and 3 mL of (3-Aminopropyl) trimethoxysilane was slowly injected. The reaction was left to proceed with stirring for 7 h under a nitrogen environment [26]. When the temperature was reduced to room temperature (25 • C), the modified TiO 2 was separated using a high-speed centrifuge.…”

Section: Methodsmentioning

confidence: 99%

“…The peaks of TiO-Ti for the anatase phase were observed at 752 and 1450 cm −1 . The peaks at 1650 and 3410 cm −1 are attributed to the OH stretching vibration of the Titania [26]. In the case of TiO 2 -NH 2 , several additional peaks are observed for CH 2 , Si-O from the silane coupling agent, and N-H along with the TiO 2 peaks.…”

Section: Characterization Of the Prepared And Modified Tio 2 Nanopartmentioning

confidence: 96%

“…Upon quantifying the percentage of two Cu states from the XPS spectra, it was found that the percentage of Cu 2+ and Cu 1+ was 81.91% and 18.09%, respectively. The capability of copper to donate and accept electrons explains its important character in oxidation-reduction reactions [26]. Therefore, the presence of two valences of oxidation states (Cu 1+ and Cu 2+ ) could enhance photocatalytic activity due to the possibility of mid-level state formation [38].…”

Section: Characterization Of the Prepared And Modified Tio 2 Nanopartmentioning

confidence: 99%

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Synthesis of Superior Visible-Light-Driven Nanophotocatalyst Using High Surface Area TiO2 Nanoparticles Decorated with CuxO Particles

et al. 2020

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This work provides an alternate unique simple methodology to design and synthesize chemically modified nanophotocatalyst based on high surface area TiO2 nanoparticles that can be used efficiently for the photodegradation of organic pollutants under normal visible light rather than complicated UV irradiation. In this study, dual visible light and UV-driven nanophotocatalysts were synthesized via wet chemistry procedures using high surface area TiO2 nanoparticles functionalized with (3-Aminopropyl) trimethoxysilane and attached chemically to the CuXO to improve the charge separation and maintain the non-charge recombination. The successful modification of the TiO2 nanoparticles and the formation of the TiO2-NH2-CuxO nanophotocatalyst were confirmed using different characterization techniques, and the results revealed the synthesis of high surface area TiO2 nanoparticles, and their chemical modification with an amino group and further decoration with copper to produce TiO2-NH2-CuxO nanophotocatalyst. The photocatalytic activity of TiO2 and TiO2-NH2-CuxO nanophotocatalyst were evaluated using methylene blue (MB) dye; as an example of organic pollutants. The resulting TiO2-NH2-CuxO nanophotocatalyst exhibited superior photocatalytic activity for the degradation of MB dye under visible light irradiation, due to the reduction in the energy bandgap. The degradation of the MB dye using the TiO2-NH2-CuxO nanophotocatalyst was investigated using LC-MS, and the results revealed that the hydroxyl free radical is mainly responsible for the cleavage and the degradation of the MB dye.

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Sequestration of CO 2 using Cu nanoparticles supported on spherical and rod-shape mesoporous silica

Cited by 31 publications

References 42 publications

Controlling the morphology of copper-silica nanocomposites from laser ablation in liquid

Controlling the morphology of copper-silica nanocomposites from laser ablation in liquid

Synthesis of Mesoporous Silica for Ammonia Adsorption in Aqueous Solution

Synthesis of Superior Visible-Light-Driven Nanophotocatalyst Using High Surface Area TiO2 Nanoparticles Decorated with CuxO Particles

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