Preparation and Characterization of Mesoporous Silica from Bagasse Bottom Ash from the Sugar Industry

Noorul Amin; Saeed Gul; Sabiha Sultana; Sultan Alam

doi:10.3390/cryst11080938

Preparation and Characterization of Mesoporous Silica from Bagasse Bottom Ash from the Sugar Industry

Crystals ◽

10.3390/cryst11080938 ◽

2021 ◽

Vol 11 (8) ◽

pp. 938

Author(s):

Noorul Amin ◽

Saeed Gul ◽

Sabiha Sultana ◽

Sultan Alam

Keyword(s):

Mesoporous Silica ◽

Sugar Industry ◽

Bottom Ash ◽

Research Literature ◽

Protective Layers ◽

Pure Silica ◽

Alkaline Dissolution ◽

Alkaline Conditions ◽

Optimized Conditions ◽

First Time

A novel and sustainable process to recycle an environmentally injurious material rich in silica—waste bagasse bottom ash from the sugar industry—into mesoporous pure silica of high purity is reported. Bagasse bottom ash (BBA) is a major byproduct of the sugar industry, with very inadequate recycling possibilities due to environmentally detrimental pollutants, whose production is dramatically increasing. In this study, for the first time, more than 70% of the silica from the bottom ash could be extracted for the synthesis of mesoporous silica using a low-temperature alkaline dissolution method instead of the customary elevated-temperature process. Furthermore, the process of dissolution was thoroughly studied to obtain the essential insight into silica hydrolysis that is largely missing from the existing research literature. Under alkaline conditions, the hydrolysis of silica is hindered due to the formation of zeolites and protective layers around the etching particles. This layer becomes a protective barrier that hinders the mass transfer of silica monomers to the solution, thus halting the dissolution process. Therefore, sequential extractions with optimized conditions of 100 °C for 72 h were employed to attain maximum silica extraction efficiency.

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Preparation of Nano-Sized Mesoporous Silica and Its Application in Immobilization of β-galactosidase from Aspergillus Oryzae

International Journal of Chemistry ◽

10.5539/ijc.v9n1p65 ◽

2017 ◽

Vol 9 (1) ◽

pp. 65

Author(s):

Jiao Yang ◽

Zhenzhen Liu ◽

Huan Ge ◽

Sufang Sun

Keyword(s):

Mesoporous Silica ◽

Aspergillus Oryzae ◽

Nitrogen Adsorption ◽

Ammonium Bromide ◽

Experimental Conditions ◽

Transmission Electron ◽

Alkaline Conditions ◽

Activity Yield ◽

Cetyl Trimethyl Ammonium ◽

First Time

In alkaline conditions, monodisperse nano-sized mesoporous silica was synthesized using cetyl trimethyl ammonium bromide (CTAB) as template and tetraethoxysilane (TEOS) silica as source in ethanol / water cosolvent conditions. Using method of nitrogen adsorption, specific surface area of the dried monodisperse nano-sized mesoporous silica was about 1591 m2/g and the pore size was about 3.8 nm. The field-emission scanning electron microscope (SEM) micrographs showed that the silica particles obtained were spherical with an approximate diameter of 160 nm and of good dispersion. Transmission electron microscopy (TEM) revealed that the carrier had an excellent cellular structure with disordered multi-channels and smooth surface. The nano-sized mesoporous silica above was employed to immobilize β-galactosidase from aspergillus oryzae for the first time. At the experimental conditions in section 2.4, the enzyme activity and the activity yield were 535.11 U/g dry carrier and 79.63%, respectively. Kinetic data of the immobilized enzyme such as optimum temperature, pH, and thermal and pH stability among other valuable results were also determined.

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Digital Printing Performance of Cashmere Fabric under Acid or Alkaline Conditions

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.214.240 ◽

2011 ◽

Vol 214 ◽

pp. 240-244

Author(s):

Yi Nong Yan ◽

Xiang Ru Zhang ◽

Dan Li ◽

Jian Jian Xu

Keyword(s):

Ph Value ◽

Digital Printing ◽

Dye Uptake ◽

Printing Quality ◽

Alkaline Conditions ◽

Basic Reference ◽

Minimal Damage ◽

First Time ◽

Pretreatment Solution

Pretreatment solution which was obtained by many experiments who had a good printing effect was used to do the digital printing experiment on the cashmere fabric. Printing performance of the cashmere fabric in different pH value was compared to improve the printing quality of the cashmere fabric. Digital printing experiments in the alkaline environment were carried out for the first time and the best pH value was found out which could ensure dye uptake, color fastness, anti-seepage property and minimal damage to cashmere fabric. The paper provided basic reference to the actual production.

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Synthesis of hexagonal and cubic mesoporous silica using power plant bottom ash

Microporous and Mesoporous Materials ◽

10.1016/j.micromeso.2007.08.019 ◽

2008 ◽

Vol 111 (1-3) ◽

pp. 455-462 ◽

Cited By ~ 52

Author(s):

Govindasamy Chandrasekar ◽

Kwang-Seok You ◽

Ji-Whan Ahn ◽

Wha-Seung Ahn

Keyword(s):

Power Plant ◽

Mesoporous Silica ◽

Bottom Ash ◽

Cubic Mesoporous

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About the basic issues of interpreting the content of K. S. Stanislavsky's lecturing about the supreme problem

National Academy of Managerial Staff of Culture and Arts Herald ◽

10.32461/2226-3209.1.2021.229604 ◽

2021 ◽

Author(s):

Оlena Moskalenko-Vysotska

Keyword(s):

Research Literature ◽

Soviet Period ◽

Present Stage ◽

True Meaning ◽

Logical Method ◽

Depth Study ◽

Historical Truth ◽

First Time ◽

Further Development ◽

Death Of The Author

The purpose of the article is to examine in detail the features of the historical fate of K. S. Stanislavsky's doctrine of the supertask, which is considered the cornerstone of his system, and to find out the reasons for the tendentiously limited interpretation of the term “supertask” in the research literature of the second half of the last century, which still remains unconsidered. The methodology of the research is the general logical method of cognition, which involves an analysis of the features of the historical era of the emergence of the doctrine of the super-task and specific measures for its dissemination among art workers. This method makes it possible to determine the causes of deformation of the defining term of the system of K. Stanislavsky. The method of comparison is also used as a cognitive operation, which makes it possible to clearly understand the primary content of the concept of "super task" and its differences from the interpretations of many other researchers of the theoretical heritage of K. S. Stanislavsky – those authors whose interpretation is based on the judgment about the similarity or difference of objects. Scientific novelty. An attempt is made to look at the fate of the Stanislavsky system as a whole and the doctrine of the super-task, in particular, from the standpoint of historical truth, in contrast to the standpoint of myth-making, which was characteristic of researchers of the Soviet era. The novelty also lies in the fact that for the first time in the theory of acting, an attempt was made to compare the true meaning put by the author of the system into the very term of the supertask itself, with the way it was interpreted by theoretical thought in the Soviet period in accordance with the ideological needs of the then society. Conclusions. As a result of a comparative analysis of the texts of K. Stanislavsky, dedicated to the disclosure of the content of the doctrine of the super-task with the formulations that tried to reveal its content in the period after the death of the author of the system, it becomes obvious that the true meaning of the doctrine has suffered a rather significant semantic deformation. This actualizes the need for a detailed and in-depth study of all the materials of his heritage, which are related to the disclosure of the content of the doctrine of the supertask, which will contribute to the further development of the system at the present stage.

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Flotation Behavior of Diatomite and Albite Using Dodecylamine as a Collector

Minerals ◽

10.3390/min8090371 ◽

2018 ◽

Vol 8 (9) ◽

pp. 371 ◽

Cited By ~ 1

Author(s):

Ying Gao ◽

Yuexin Han ◽

Wenbo Li

Keyword(s):

Unit Area ◽

Alkaline Ph ◽

Force Microscopy ◽

Atomic Force ◽

Mineral Flotation ◽

Alkaline Conditions ◽

Negative Surface ◽

Negative Surface Charge ◽

Ph Range ◽

First Time

The flotation behaviors of diatomite and albite using dodecylamine (DDA) as a collector were investigated and compared. The pure mineral flotation results indicate that the flotability difference between albite and diatomite is above 87% at pH 5.5 to 10.5. The recovery of albite improves with increasing DDA dosage at pH 5.5 to 10.5. In the same pH range, diatomite has weaker flotability than albite, particularly in alkaline pH pulp. Zeta potential measurements indicate that diatomite has a higher negative surface charge than albite at pH 7 to 12, DDA interacts strongly with albite and weakly with diatomite. Thus, DDA preferentially absorbs on albite surface rather than diatomite under alkaline conditions. Fourier transform infrared spectra (FTIR) indicate that the amount of DDA adsorbed to albite is greater than that adsorbed to diatomite, under the same conditions. The adsorption of DDA on the surface of diatomite is investigated by using atomic force microscopy (AFM) for the first time. The adsorption of the collector DDA on the surface of albite per unit area is greater than that on diatomite. This accounts for the lower recovery of diatomite than that of albite.

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Absorption of Mechanical Energy via Formation of Ice Nanotubes in Zeolite

Physical Chemistry Chemical Physics ◽

10.1039/d1cp01482j ◽

2021 ◽

Author(s):

Kenji Mochizuki

Keyword(s):

Molecular Dynamics ◽

Molecular Dynamics Simulations ◽

Heterogeneous System ◽

Mechanical Energy ◽

Bulk Water ◽

Pure Silica ◽

Dynamics Simulations ◽

First Time

Abstract Molecular dynamics simulations are carried out for a heterogeneous system composed of bulk water and pure-silica zeolites of the AFI type. Our simulations show, for the first time, the...

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Semi-Synthetic Approach Leading to 8-Prenylnaringenin and 6-Prenylnaringenin: Optimization of the Microwave-Assisted Demethylation of Xanthohumol Using Design of Experiments

Molecules ◽

10.3390/molecules25174007 ◽

2020 ◽

Vol 25 (17) ◽

pp. 4007

Author(s):

Corinna Urmann ◽

Herbert Riepl

Keyword(s):

Reaction Time ◽

Lithium Chloride ◽

Biological Effects ◽

Synthetic Approach ◽

Prenylated Flavonoids ◽

Microwave Assisted ◽

Synthesis Strategy ◽

Final Yield ◽

Optimized Conditions ◽

First Time

The isomers 8-prenylnaringenin and 6-prenylnaringenin, both secondary metabolites occurring in hops, show interesting biological effects, like estrogen-like, cytotoxic, or neuro regenerative activities. Accordingly, abundant sources for this special flavonoids are needed. Extraction is not recommended due to the very low amounts present in plants and different synthesis approaches are characterized by modest yields, multiple steps, the use of expensive chemicals, or an elaborate synthesis. An easy synthesis strategy is the demethylation of xanthohumol, which is available due to hop extraction industry, using lithium chloride and dimethylformamide, but byproducts and low yield did not make this feasible until now. In this study, the demethylation of xanthohumol to 8-prenylnaringenin and 6-prenylnaringenin is described the first time and this reaction was optimized using Design of Experiment and microwave irradiation. With the optimized conditions—temperature 198 °C, 55 eq. lithium chloride, and a reaction time of 9 min, a final yield of 76% of both prenylated flavonoids is reached.

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Calculation of Seven Photovoltaic Cells Parameters Using Parallelized Successive Discretization Algorithm

International Journal of Photoenergy ◽

10.1155/2020/6669579 ◽

2020 ◽

Vol 2020 ◽

pp. 1-13

Author(s):

Adrian M. Deaconu ◽

Daniel T. Cotfas ◽

Petru A. Cotfas

Keyword(s):

Root Mean Square Error ◽

Mean Square Error ◽

Root Mean Square ◽

Photovoltaic Cell ◽

Research Literature ◽

Photovoltaic System ◽

Mean Square ◽

Solar Module ◽

Discretization Algorithm ◽

First Time

Some parameters must be calculated with very good accuracy for the purpose of designing, simulating, and evaluating the performance of a photovoltaic system. The seven parameters of the photovoltaic cell and panels for the two-diode model are determined using a parallelized metaheuristic algorithm based on successive discretization. The parameters obtained for a photovoltaic cell and four panels using the proposed algorithm are compared with the ones calculated through over twenty methods from recent research literature. The root mean square error is used to prove the superiority of the Parallelized Successive Discretization Algorithm (PSDA). The smallest values for root mean square error (RMSE) in both cases, photovoltaic cell and panels, are obtained for the algorithm presented in this paper. The seven parameters for three panels known in the specialised literature, Kyocera KC200GT, Leibold Solar Module LSM 20, and Leybold Solar Module STE 4/100 are determined for the first time using PSDA.

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Synthesis of Mesoporous Silica from Bottom Ash Waste for CH4 Adsorption

Materials Science Forum ◽

10.4028/www.scientific.net/msf.964.130 ◽

2019 ◽

Vol 964 ◽

pp. 130-135

Author(s):

Pradena Bhesari Fitrah Laharto ◽

Aristin Putri Kusuma Anggraini ◽

Umirul Solichah Fauzany ◽

Randy Yusuf Kurniawan ◽

Purwanti Setyaningsih Endang

Keyword(s):

Mesoporous Silica ◽

Adsorption Capacity ◽

High Temperatures ◽

Gas Adsorption ◽

Bottom Ash ◽

Gravimetric Method ◽

Basic Material ◽

Melting Method ◽

Peg 4000

The aim of this research is to synthesize mesoporous silica directly from the bottom ash waste through the melting method using alkali at high temperatures. The resulting mesoporous silica will be used as CH4 gas adsorbent. The bottom ash waste was firstly separated by Fe and Ca using 37% HCl followed by melting at high temperatures and producing silica extract. The extract will be used as the basic material for making mesoporous silica which impregnation with PEG 4000. The resulting solids will then be characterized using XRD and BET. The result of mesoporous silica was then carried out by measuring CH4 gas adsorption capacity by gravimetric method with interval temperature of 30, 40, and 50 °C and pressure of 1, 3, and 5 atm.

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