Controllable Biogenic Synthesis of Intracellular Silver/Silver Chloride Nanoparticles by Meyerozyma guilliermondii KX008616

( Saad A. M. Alamri ),( Mohamed Hashem ),( Nivien A. Nafady ),( Mahmoud A. Sayed ),( Ali M. Alshehri ),( Gamal A. El-shaboury ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.6

Intracellular synthesis of silver/silver chloride nanoparticles (Ag/AgCl-NPs) using Meyerozyma guilliermondii KX008616 is reported under aerobic and anaerobic conditions for the first time. The biogenic synthesis of Ag-NP types has been proposed as an easy and cost-effective alternative for various biomedical applications. The interaction of nanoparticles with ethanol production was mentioned. The purified biogenic Ag/AgCl-nanoparticles were characterized by different spectroscopic and microscopic approaches. The purified nanoparticles exhibited a surface plasmon resonance band at 419 and 415 nm, confirming the formation of Ag/AgCl-NPs under aerobic and anaerobic conditions, respectively. The planes of the cubic crystalline phase of the Ag/AgCl-NPs were confirmed by X-ray diffraction. Fourier-transform infrared spectra showed the interactions between the yeast cell constituents and silver ions to form the biogenic Ag/AgCl-NPs. The intracellular Ag/AgCl-NPs synthesized under aerobic condition were homogenous and spherical in shape, with an approximate particle size of 2.5-30nm as denoted by the transmission electron microscopy (TEM). The reaction mixture was optimized by varying reaction parameters, including temperature and pH. Analysis of ultrathin sections of yeast cells by TEM indicated that the biogenic nanoparticles were formed as clusters, known as nanoaggregates, in the cytoplasm or in the inner and outer regions of the cell wall. The study recommends using the biomass of yeast that is used in industrial or fermentation purposes to produce Ag/AgCl-NPs as associated by-products to maximize benefit and to reduce the production cost.

Synthesis, characterization and application of curcumin formaldehyde resin for the removal of Cd2+ from wastewater: Kinetics, isotherms and thermodynamic studies

Mu. Naushad,Saad M. Alshehri,Tansir Ahamad,Zeid A. AlOthman,Muhammad Ali Shar,Noura S. AlHokbany 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-

The present work deals with the removal of highly toxic Cd2+from wastewater using ecofriendlycurcumin (7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione) formaldehyde resin (CFR). The CFR resin was characterized using several analytical techniques. The adsorption kinetics andisotherms were well fitted by pseudo-second-order and Freundlich models, respectively. The adsorptionof Cd2+ onto CFR was increased with the ionic strength (NaCl). The regeneration studies demonstrated adecrease in the adsorption of Cd2+ from 94% to 80% after five consecutive cycles. All results illustratedthat CFR was a promising adsorbent for the environmental pollution cleanup.

Measurements of Service Quality of Islamic Banking in Malaysia: A Non-Malaysian Customers’ Perspective

Abdo Yousef Qaid SAAD,Amer M Alhusini ALSHEHRI 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5

The study aims to measures the service quality of Islamic banking in Malaysia from non-Malaysian customers’ perspective based on the six different dimensions of the SERVQUAL model, namely, Shariah, assurance, reliability, tangibles, empathy and responsiveness. This study surveyed 100 non-Malaysian respondents from 25 different countries who have first-hand experience with Islamic banking services in Malaysia. The collected data were analysed by using the SPSS v23 for reliability analysis and descriptive statistics. The results indicates that customers’ impressions of Islamic banks’ service quality in Malaysia did not meet their standards. The independent variables, namely, compliance, assurance, reliability and empathy have positively affected customer satisfaction, while two dimensions, namely, tangibility and responsiveness does not significantly influence non-Malaysian customer satisfaction in the Islamic banking system in Malaysia. The findings of the study suggested that the Islamic banks should develop and obey the customer perception’s policy by following customers’ expectations and the results are also expected to include recommendations for improving the level of satisfaction of the Islamic banking system’s foreign clients in Malaysia. Since this study was limited to Islamic banks in Malaysia, the findings may not be applicable to other traditional banks.

Synthesis of a recyclable mesoporous nanocomposite for efficient removal of toxic Hg2+ from aqueous medium

Tansir Ahamad,Mu. Naushad,Basheer M. Al-Maswari,Jahangeer Ahmed,Zeid A. AlOthman,Saad M. Alshehri,Ayoub Abdullah Alqadami 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-

A mesoporous magnetic zirconium phosphate was prepared for the removal of Hg2+ from aqueous medium. The saturation magnetization of pure Fe3O4 and Fe3O4@ZrP was observed 82.9 and 62.4 emu/g, respectively. The effect of different adsorption parameters was studied. The kinetic data were fitted to the pseudo 1st and pseudo 2nd order models whereas the adsorption process was best fitted into the pseudo 2nd order model. The adsorption isotherm could be well described with Langmuir model, with the maximum adsorption capacity of 181.8 mg g1 at 25 C. Thus, the present studies suggested that Fe3O4@ZrP have remarkable potential for Hg2+ removal from contaminated water.

Dual-textured Prussian Blue nanocubes as sodium ion storage materials

Kim, Dae Sik,Zakaria, Mohamed B.,Park, Min-Sik,Alowasheeir, Azhar,Alshehri, Saad M.,Yamauchi, Yusuke,Kim, Hansu Elsevier 2017 ELECTROCHIMICA ACTA Vol.240 No.-

<P><B>Abstract</B></P> <P>Sodium ion batteries are being highlighted as a promising energy storage system to resolve the critical issues associated with lithium ion battery usage due to a limited quantity of lithium resources on the earth. Although recent advances in sodium ion battery technology have been remarkable, the reversible capacities and cyclic performance of sodium ion batteries should be further advanced prior to their successful implementation. Herein, we demonstrate dual-textured Prussian blue nanocubes prepared <I>via</I> simple acid etching as a reliable sodium storage material. Taking advantage of their hybrid microstructure composed of porous and non-porous domains, dual-textured Prussian blue nanocubes exhibit high reversible capacities, good rate capabilities, and stable cyclic performance. Moreover, the nanocubes exhibit excellent dimensional stability even after 100 cycles, offering new opportunities for the development of robust and high-performance sodium rechargeable batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dual-textured Prussian Blue nanocubes by controlled chemical etching. </LI> <LI> Highly reversible Na<SUP>+</SUP> storage characteristics of dual-textured PB nanocubes. </LI> <LI> Mechanical integrity of proposed PB against repeated Na<SUP>+</SUP> storage and extraction. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Magnetic molecularly imprinted polymer photocatalysts: synthesis, applications and future perspective

Komal Poonia,Pankaj Raizada,Archana Singh,Narinder Verma,Tansir Ahamad,Saad M. Alshehri,Aftab Aslam Parwaz Khan,Pardeep Singh,Chaudhery Mustansar Hussain 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-

Effective degradation of low-concentration pollutants is a critical challenge during the water purificationprocess. The use of different chemicals can leave residue in samples that can impose potential ecotoxicologicaland adverse impacts on human health. Presently, Magnetic molecularly imprinted polymers(MMIPs) have attracted much attention as the research material comprises a non-magnetic polymerand magnetic material for selective binding for target molecule and recoverability of catalyst via magnetism,respectively. This review explains the synergistic effect of adsorption with photocatalysis tounderstand their recognition mechanism and the possible interaction between the target molecule andMIPs. Then their common imprinting polymerization processes i.e., free radical polymerization andnon-free radical polymerization are briefly discussed with their respective advantages and disadvantages. In addition, this review highlights the photocatalytic degradation mechanism of photocatalyst cumadsorbent is critically discussed by comparing it with non-imprinted polymers. Finally, the applicationsof MMIPs in the removal or degradation of refractory pollutants, sensing, and recognition have alsobeen delineated. This paper summarises progressive future challenges of the technology that need tobe exploited for the preparation of the targeted catalyst.

Design of non-faradaic EDLC from plasticized MC based polymer electrolyte with an energy density close to lead-acid batteries

Shujahadeen B. Aziz,Rebar T. Abdulwahid,Mohd F. Z. Kadir,Hewa O. Ghareeb,Tansir Ahamad,Saad M. Alshehri 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-

The investigation of biodegradable polymer electrolyte for energy device applications is of great importanceas a suitable alternative to the conventional electrolytes. This paper explores the employment ofplasticized methylcellulose (MC)-based polymer electrolytes for energy storage EDLC device applicationwith an energy density (46.29 Wh kg 1) close enough to lead-acid batteries. The results have shown thatthe inclusion of plasticizer can enhance the ionic conductivity to 1.17 10 3 S cm 1. It was found that theprepared polymer electrolyte was stable up to 2.1 V, which is sufficient to be employed as electrolyte andseparator in fabrication of electrical double layer capacitor (EDLC). Both te and ti values have been quantifiedfrom the TNM measurements, where the ti values for the electrolytes containing 32 wt.% and 40 wt. % of glycerol plasticizer have been found as 0.963 and 0.802, respectively. The performance of the assembledEDLC was assessed using both cyclic voltammetry (CV) and charge-discharging responses. Theabsence of redox peaks is evidenced from the CV. The value of initial specific capacitance (Cspe) of the fabricatedEDLC is 411.52 F g 1. The results achieved in this study can be considered as a breakthrough inEDLC devices.

Efcient and Stable Ideal Bandgap Perovskite Solar Cell Achieved by a Small Amount of Tin Substituted Methylammonium Lead Iodide

Yongqi Yin,Sufang Fu,Sheng Zhou,Yuling Song,Lin Li,Mingyi Zhang,Jie Wang,Pandiyarajan Mariyappan,Saad M. Alshehri,Tansir Ahamad,Yusuke Yamauchi 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.3

Ideal bandgap ~1.4 eV of lead–tin (Pd–Sn) organic–inorganic hybrid perovskite absorber is essential to further enhance thepower conversion efciency of perovskite solar cells (PVSCs). However, due to the facile oxidation of Sn2+, large amount ofSn substituted Pb based PVSCs sufer with low stability in ambient environment. In this work, we realize an ideal bandgapperovskite by introducing a small amount (10 mol%) of Sn2+ to methylammonium lead iodide (MAPbI3). A large grain sizeMAPb0.9Sn0.1I3 flms with strong absorbance can be obtained. As a result, the best performance up to 18.3% efciency isachieved. Importantly, the MAPb0.9Sn0.1I3 cell retains 90% of its performance after operation at the maximum power pointunder full 1-sun illumination for 500 h, in contrast to the quick degradation of MAPbI3 cell. This study demonstrates thepromising potential of stable and efcient ideal band-gap Pb–Sn PVSCs.

An overview of SnO2 based Z scheme heterojuctions: Fabrication, mechanism and advanced photocatalytic applications

Akshay Chawla,Anita Sudhaik,Pankaj Raizada,Aftab Aslam Parwaz Khan,Archana Singh,Quyet Van Le,Van Huy Nguyen,Adem Sreedhar,Saad M. Alshehri,Abdullah M. Asiri,Pardeep Singh 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

Not just people, but all living species, desire a clean and green environment to live a happy and healthylife. However, in our ever-increasingly congested world, it is quite challenging. Excessive deforestation,factory smoke, various chemical compounds, agricultural chemicals, etc. all pollute our environmentseverely. Some of its adverse consequences include water contamination and a shortage of energy supplies. In recent times, photocatalysts have sparked tremendous attention as a means of addressing energydemands as well as environmental challenges (water pollution). For this, SnO2 and SnO2 based photocatalystshave gained a great attention due to its good photocatalytic ability. In the same way, SnO2-based Zschemephotocatalysts has extended significant interest to address these concerns due to its strong photocatalyticcharacteristics, energy savings, eco-friendliness, and lack of adverse health effects. Though, thephotocatalytic effectiveness of conventional SnO2 semiconductors, with their shortcomings, falls wellshort of the real requirements. The current review emphasizes on admirable properties and several synthesisprocesses of SnO2 which make it an ideal photocatalyst. This study also stresses the fundamentalshortcomings of SnO2 that restrict its utilization. The central section of this review is concentrated onSnO2-based Z-scheme photocatalysts and most recent significant research modification of Z-schemeSnO2-based photocatalysts. The photocatalytic applications of Z-scheme SnO2-based photocatalysts forpollutants removal, energy conversion, and water splitting are also summarized. In conclusion, we haveaddressed the challenges and future exploration of SnO2-based photocatalysts with a Z-scheme heterojunctiontype for pollutant degradation and energy conversion.