Multistep sequestration and storage of CO₂ to form valuable products using forsterite

Raza, Waseem,Raza, Nadeem,Agbe, Henry,Kumar, R.V.,Kim, Ki-Hyun,Yang, Jianhua Elsevier 2018 ENERGY Vol.155 No.-

<P><B>Abstract</B></P> <P>The potential use of mineralogical carbonation is greatly acknowledged not only in reducing CO<SUB>2</SUB> emissions through carbon capture and storage (CCS) but also in producing industrially viable products. The direct carbonation of stable silicate minerals by supercritical CO<SUB>2</SUB> is unrealistic due to the low conversion efficiencies. The natural abundance of silicate minerals (e.g., olivine) is theoretically sufficient to fix the entire quantity of man-made CO<SUB>2</SUB> emissions, while carbonation of sorbents obtained from the dissolution of silicate rocks could proceed in a multistep (or continuous) process. In this work, the optimum experimental conditions for a multistep procedure of sequestration of minerals and conversion of CO<SUB>2</SUB> into valuable products were investigated using synthetic forsterite. In this research, magnesium sulfate obtained from the dissolution of forsterite in aqueous H<SUB>2</SUB>SO<SUB>4</SUB> was successfully carbonated to produce valuable byproducts (e.g., silica and hydrates of magnesite) with an economical carbonation as a means of CO<SUB>2</SUB> mitigation. Hydromagnesite, while being commercially applied in various fields (e.g., fire retardation and catalysis), can be transformed to magnesite which is stable for millions of years.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The carbonation of synthetic forsterite can be achieved via multistep reaction pathways. </LI> <LI> Through such conversion, the complete set of valuable products can be produced. </LI> <LI> This approach can effectively mitigate CO<SUB>2</SUB> through the formation of valuable products. </LI> <LI> In this work, optimum reaction conditions for such conversion has been sought. </LI> </UL> </P>

Recent developments in analytical quantitation approaches for parabens in human-associated samples

Raza, Nadeem,Kim, Ki-Hyun,Abdullah, Muhammad,Raza, Waseem,Brown, Richard J.C. Elsevier 2018 Trends in analytical chemistry Vol.98 No.-

<P>Parabens are an important class of antimicrobial compounds used as preservatives. Although they are considered to be safe when used within specified concentration limits, concerns about their potential toxicity have been raised due to their presence in cancerous breast tissues and their association with estrogenic activity, various kinds of allergies, and the malfunctioning of reproductive organs. The small quantities of parabens in human samples and complex nature of biological matrices make it difficult to determine free and/or conjugated forms of parabens and their metabolites. Consequently, it is desirable to develop sophisticated approaches for their sample pretreatments and subsequent determination. This review presents recent developments in the extraction, pre-concentration, and instrumental detection methods needed for the accurate quantification of parabens in human samples. This review is thus expected to help readers assess the potential impacts of parabens on human health through proper description of their exposure routes to human. (C) 2017 Elsevier B.V. All rights reserved.</P>

Quantification techniques for important environmental contaminants in milk and dairy products

Raza, Nadeem,Kim, Ki-Hyun Elsevier 2018 Trends in analytical chemistry Vol.98 No.-

<P>The growing demands of milk and milk products necessitated the use of various kinds of chemicals including antibiotics, urea, and hormones. Although they are essential in the bulk production of milk, they can pose serious health issues not only to animals but also to consumers. To identify and quantify various contaminants (e.g., antibiotics, pesticides, and polycyclic aromatic hydrocarbons) in milk and its related products, it is desirable to establish reliable means for instrumental detection. This review was organized to summarize the analytical techniques currently available for the identification and quantification of contaminants in milk and dairy products. To this end, this review emphasizes the compositional diversity of various contaminants in milk and its products. This study thus aims to provide valuable insights into the essential protocols for the quantification of dairy-related contaminants while helping make the fast and firm decisions needed for the legislation, regulations, and health care. (C) 2017 Elsevier B.V. All rights reserved.</P>

Recent advancements in supercapacitor technology

Raza, Waseem,Ali, Faizan,Raza, Nadeem,Luo, Yiwei,Kim, Ki-Hyun,Yang, Jianhua,Kumar, Sandeep,Mehmood, Andleeb,Kwon, Eilhann E. Elsevier 2018 Nano energy Vol.52 No.-

<P><B>Abstract</B></P> <P>Supercapacitors (SCs) are attracting considerable research interest as high-performance energy storage devices that can contribute to the rapid growth of low-power electronics (e.g., wearable, portable electronic devices) and high-power military applications (e.g., guided missile techniques and highly sensitive naval warheads). The performance of SCs can be assessed in terms of the electrochemical properties determined through a combination between the electrode and the electrolyte materials. Likewise, the charge storage capacities of SCs can be affected significantly by selection of such materials (e.g., via surface redox mechanisms). Enormous efforts have thus been put to make them more competitive with existing options for energy storage such as rechargeable batteries. This article reviews recent advances in SC technology with respect to charge storage mechanisms, electrode materials, electrolytes (e.g., particularly paper/fiber-like 3D porous structures), and their practical applications. The challenges and opportunities associated with the commercialization of SCs are also discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> There has been great demand for a reliable technical platform for electrochemical storage. </LI> <LI> SCs are highly attractive option due to their fast storage capability and enhanced cyclic stability. </LI> <LI> This review covers the charge storage mechanisms of SCs along with comparison of selected SCs. </LI> <LI> We also discuss the technical challenges for developing SCs with high enough energy density. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Aromatic hydrocarbons in air, water, and soil: Sampling and pretreatment techniques

Raza, Nadeem,Hashemi, Beshare,Kim, Ki-Hyun,Lee, Sang-Hun,Deep, Akash Elsevier 2018 Trends in analytical chemistry Vol.103 No.-

<P><B>Abstract</B></P> <P>The co-occurrence of various aromatic hydrocarbon compounds (AHs) in all major environmental compartments (<I>e.g.</I>, air, water, and soil) and the escalating risks they present to humans and animals highlight the significance of understanding the cycling of these compounds in and across systems. To precisely monitor the behavior of AHs and routes of their exposure, it is critical to obtain accurate measurements of these compounds. Therefore, sampling, pre-concentration, and detection methods should be optimized by each or through combination for each medium under proper QA procedures. In this work, we reviewed the sampling and pre-concentration procedures for AHs present in air, water, and soil media. This review will provide basic methodological knowledge needed for the accurate quantitation of AHs samples in air, water, and soil.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Best sampling methods for aromatic hydrocarbons (AHs) are identified and recommended. </LI> <LI> Their accurate analysis is greatly affected by selection of sampling/pre-treatment methods. </LI> <LI> Numerous physical/chemical/biological factors can affect sample integrity of AHs. </LI> <LI> Merits and demerits of all related techniques for AHs quantitation are presented. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Recent Advances in Titania-based Composites for Photocatalytic Degradation of Indoor Volatile Organic Compounds

Nadeem Raza,김기현,Henry Agbe,Suresh Kumar Kailasa,Jan E. Szulejko,Richard J. C. Brown 한국대기환경학회 2017 Asian Journal of Atmospheric Environment (AJAE) Vol.11 No.4

Indoor air pollutants can cause severe health problems, specifically in terms of toxicological impacts on human. Every day, a complex mixture of many air pollutants is emitted from various sources and subject to atmospheric processes that can create varied classes of pollutants such as carboxylic acids, aldehydes, ketones, peroxyacetyl nitrate, and hydrocarbons. To adhere to indoor air quality standards, a number of techniques such as photocatalytic oxidation of various volatile organic compounds (VOCs) have been employed. Among these techniques, titania (TiO2) based photocatalytic reactions have proven to be the best benchmark standard approach in the field of environmental applications. Over the last 45 years, TiO2-based photocatalytic reactions have been explored for the degradation of various pollutants. This review discusses the indoor air quality profile, types of indoor pollutants, available indoor air cleaning approaches, and performance of TiO2- based catalysts. Finally, we have presented the perspectives on the progress of TiO2 induced photocatalysis for the purification of indoor air.

Removal of phenolic compounds from industrial waste water based on membrane-based technologies

Waseem Raza,이제찬,Nadeem Raza,Yiwei Luo,김기현,Jianhua Yang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-

Phenol and its derivatives from various man-made activities pose threats to public health and aquaticecosystems. A number of technologies (e.g., adsorption, oxidation, and biological methods) have beenproposed and tested to remove phenolic compounds from waste water. Among these technologies,membrane separation is considered one of the most efficient tools for abating phenolic compounds fromwaste water because of low capital cost, easy scalability, and ecofriendly production with the lowestemission of noxious compounds. In this review, we aim to address the potent role of membranetechnology by evaluating its performance in separating various phenolic compounds from industrialeffluents.

A NOTE ON GENERALIZED SKEW DERIVATIONS ON MULTILINEAR POLYNOMIALS

RAZA, MOHD ARIF,REHMAN, NADEEM UR,GOTMARE, A.R. The Korean Society for Computational and Applied M 2021 Journal of applied mathematics & informatics Vol.39 No.1

Let R be a prime ring, Qr be the right Martindale quotient ring and C be the extended centroid of R. If �� be a nonzero generalized skew derivation of R and f(x1, x2, ⋯, xn) be a multilinear polynomial over C such that (��(f(x1, x2, ⋯, xn)) - f(x1, x2, ⋯, xn)) ∈ C for all x1, x2, ⋯, xn ∈ R, then either f(x1, x2, ⋯, xn) is central valued on R or R satisfies the standard identity s4(x1, x2, x3, x4).

Derivations with Power Values on Lie Ideals in Rings and Banach Algebras

Rehman, Nadeem ur,Muthana, Najat Mohammed,Raza, Mohd Arif Department of Mathematics 2016 Kyungpook mathematical journal Vol.56 No.2

Let R be a 2-torsion free prime ring with center Z, U be the Utumi quotient ring, Q be the Martindale quotient ring of R, d be a derivation of R and L be a Lie ideal of R. If $d(uv)^n=d(u)^md(v)^l$ or $d(uv)^n=d(v)^ld(u)^m$ for all $u,v{\in}L$, where m, n, l are xed positive integers, then $L{\subseteq}Z$. We also examine the case when R is a semiprime ring. Finally, as an application we apply our result to the continuous derivations on non-commutative Banach algebras. This result simultaneously generalizes a number of results in the literature.

Parametric optimization for surface roughness, kerf and MRR in wire electrical discharge machining (WEDM) using Taguchi design of experiment

Adeel Ikram,Nadeem Ahmad Mufti1,Muhammad Qaiser Saleem,Ahmed Raza Khan 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.7

This paper reports the effect and optimization of eight control factors on material removal rate (MRR), surface roughness and kerf in wire electrical discharge machining (WEDM) process for tool steel D2. The experimentation is performed under different cutting conditions of wire feed velocity, dielectric pressure, pulse on-time, pulse off-time, open voltage, wire tension and servo voltage by varying the material thickness. Taguchi’s L18 orthogonal array is employed for experimental design. Analysis of variance (ANOVA) and signal-tonoise (S/N) ratio are used as statistical analyses to identify the significant control factors and to achieve optimum levels respectively. Additionally, linear regression and additive models are developed for surface roughness, kerf and material removal rate (MRR). Results of the confirmatory experiments are found to be in good agreement with those predicted. It has been found that pulse on-time is the most significant factor affecting the surface roughness, kerf and material removal rate.