Oxidative desulfurization of refinery diesel pool fractions using LaVO4 photocatalyst

Iqrash Shafiq,Murid Hussain,Sumeer Shafique,Ruhma Rashid,Parveen Akhter,Ashfaq Ahmed,전종기,박영권 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-

Oxidative desulfurization (ODS) is a swiftly rising organosulfur compounds eradicating system, effectiveenough at a mild temperature and pressure, overwhelming the necessity of costly hydrogen in thetraditional HDS systems. In this study, pure LaVO4 photocatalyst was prepared using the hydrothermalapproach and employed for deep oxidative desulfurization application in the aerobic environment undervisible-light irradiations. The as-prepared photocatalyst semiconductor material was characterized byFTIR, SEM, UV–vis DRS and Raman analyses. The examined photocatalyst presented a narrow bandgap, asmall particle size, high photo-responsive monoclinic phase, high light photons capturability, plenteousactive sites accessibility and reduced recombination of photogenerated charge carriers, ensuing a goodvisible-light-driven deep oxidative desulfurization ability. The photocatalytic material was tested for itsperformance over different petroleum refinery diesel pool fraction streams including hydrodesulfuriza-tion unit diesel rundown, mild hydrocracking unit rundown gas oil, heavy kerosene oil and the ultimatediesel oil blend, containing organosulfur compounds ranging from disulfides to the stringentorganosulfur compounds, with the quantity lying between 57 and 863 ppm. The kinetic study wasfound in agreement with the pseudo-first-order kinetics. The conceivable desulfurization mechanismwas also anticipated. Moreover, the recyclability of the photocatalytic material was also discussed.

A comprehensive numerical design of firefighting systems for onshore petroleum installations

Iqrash Shafiq,Murid Hussain,Sumeer Shafique,Muhammad Haris Hamayun,Muhammad Mudassir,Zeeshan Nawaz,Ashfaq Ahmed,박영권 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.9

Petroleum facilities containing welded steel bulk flammable liquid product storage tanks possess sundry fire hazards inherent to the facility. These installations urgently require indigenous efficient firefighting systems. So, the efficient design of firewater and firefighting foam system is dynamic in controlling fire-related emergencies. The paper deals with the in-depth conceptualization of the design and analysis of firefighting systems for a typical petroleum handling, processing and storage facility in compliance with international standards. The study is aimed to formulate the elementary technique for designing an optimized firefighting system. The proposed objective was achieved by considering an ideal tank farm site that is most commonly located in a range of terminal stations, pumping stations, petroleum refineries, well sites, etc. Sufficient illumination was enumerated on the standardized classification of the liquid fuel product with respect their flammability range. Special guidelines regarding firefighting system design basis were defined and an optimized firefighting and foam system design was developed. Moreover, sufficient limitations that must be considered during the firefighting of huge tank fires are discussed. This comprehensive numerical design philosophy offers a simple and wide-ranging guide to industrial practitioners by formulating the principles for industrial firefighting system design.

Montmorillonite-Supported BiVO4 nanocomposite: Synthesis, interface characteristics and enhanced photocatalytic activity for Dye-contaminated wastewater

Parveen Akhter,Iqrash Shafiq,Faisal Ali,Faiza Hassan,Roeya Rehman,Nasir Shezad,Ashfaq Ahmed,Farrukh Jamil,Murid Hussain,Young-Kwon Park 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-

Textile effluents may harm the human body as well as cause environmental pollution. For several decadesresearchers have been attempting to overcome this issue by introducing environmentally friendly technologiesthat degrade bulk dyes to mitigate hazards. Synthetic dyes are carcinogenic for humans as wellas for other living organisms. Various techniques have been developed for the removal of these toxiccompounds, advanced oxidation processes (AOPs) being the most used processes. In this study,Montmorillonite (MMT) supported BiVO4 nanocomposite was prepared by the sol–gel method to degradeBrilliant Red 80 dye using photocatalysis. The BiVO4/MMT composite was comprehensively characterizedby several characterization techniques including X-ray diffraction (XRD), Fourier-transform infraredspectroscopy (FTIR), Scanning electron microscopy (SEM), Raman, Photoluminescence spectroscopy(PL), and UV–Vis diffuse reflectance spectroscopy (UV–Vis-DRS). Interestingly, the composite materialshowed a narrow bandgap of 2.26 eV with strong light absorption in the visible range. A 1000-wattXenon Lamp was used for activity performance measurement. The photocatalytic Brilliant Red 80 degradationactivity was observed to be 99% degraded within 120 min of illumination compared to conventionalBiVO4 which showed around 80% degradation. Moreover, in this work, an acidic media wasfound to favor the degradation of Brilliant Red 80 dye.

Carbon nanotubes loaded N,S-codoped TiO2: Heterojunction assembly for enhanced integrated adsorptive-photocatalytic performance

Maira Shabir,Nasir Shezad,Iqrash Shafiq,Ibrahim M. Maafa,Parveen Akhter,Kshaf Azam,Ashfaq Ahmed,See Hoon Lee,Young-Kwon Park,Murid Hussain 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-

A visible-light active N,S-codoped TiO2 incorporated with carbon nanotubes (CNTs) was synthesized by amulticomponent heterojunction scheme. The synthesized photocatalysts was examined by several analysistechniques. The conventional TiO2, N-doped TiO2, TiO2/CNT and N,S-codoped TiO2 were also synthesized,characterized, and integrated adsorptive-photocatalytic degradation rates were subsequentlycompared and assessed, for comparative purposes as reference photocatalysts. The parametric studywas also carried out to investigate the effect of various operational factors, such as solution pH, the photocatalystloading and initial concentration of dye solution, on the adsorptive-photocatalytic performance. The best activity performance was attained with the N,S-TiO2/CNTs nanocomposite due to thesynergistic effect of ternary components caused by the incorporation of dopants and CNTs in TiO2 lattice,providing a high number of adsorption sites and facilitating the effective separation of photogeneratedcharge carriers and minimal recombination rates. N,S-TiO2/CNTs exhibited around three times higherphotocatalytic performance than that of the binary composites, i.e., N-TiO2, TiO2/CNTs, N,S-TiO2, andabout four times higher than the conventional TiO2. Furthermore, the superior nanocomposites were alsoinvestigated for their recyclability for five consecutive cycles.

Investigation of the thermodynamic performance of an existing steam power plant via energy and exergy analyses to restrain the environmental repercussions: A simulation study

Muhammad Haris Hamayun,Murid Hussain,Iqrash Shafiq,Ashfaq Ahmed,Young-Kwon Park 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.1

Exergy analysis is an important tool to identify the improvements in various industrial processes. In this study, the existing steam power plant is examined based on energy and exergy analyses. The steam network in the power plant is comprised of two sections, one of them is used for paddy drying, while other portion is used to operate the turbine for in-house electricity production. Mass, energy, and exergy balances are applied to individual equipment of the plant. The power plant is modeled and simulated using Aspen HYSYS® V10. The calculated thermodynamic values are used for in-depth analysis of the power plant. Case-studies are included in this study to show the effect of various operational parameters on the process efficiency. The analysis shows that the boiler is the major source of exergy destruction, because of the incomplete combustion process, and inappropriate insulations. The remedial actions are also suggested in the study.

A review on recent advances in the treatment of dye-polluted wastewater

Maira Shabir,Muhammad Yasin,Murid Hussain,Iqrash Shafiq,Parveen Akhter,Abdul-Sattar Nizami,전병훈,Young-Kwon Park 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-

The textile effluent has an unfavorable effect on the waterbodies as well as on the human health due tothe poor penetration of light by increased turbidity and higher oxygen demands. Therefore, the treatmentof dye-polluted wastewater is gaining an urgent attention. This review emphasizes on the sate-of-the-arttechnologies that have been developed for treating dye-polluted wastewater, including chemical, physical,and biological techniques alongside their benefits, challenges, and upcoming prospects. The studyconcludes that the single process alone may not be appropriate for the treatment of a range of dyepollutedwastewaters and approaching the quality demands as these technologies requires more timeand are complex. Literature exhibiting a range of approaches for treating large volumes of effluents withoutproducing secondary pollutants are reviewed. Moreover, the ecological impact was among the mainconcern due to the loss of catalysts and the production of waste sludge. On the other hand, reusability andregeneration are the integrated strategies to deal with such limitations. This review also provides adetailed environmental and techno-economic analysis, life cycle assessment, and practical implications. Moreover, the key bottlenecks requiring a major consideration concerning the universal appreciation ofhybrid frameworks are emphasized.

Antioxidant activity of sea buckthorn (Hippophae rhamnoides) seed oil extracted using various organic solvents

Akhter Parveen,Bhatti Taseer Yasrab,Shafiq Iqrash,Jamil Farrukh,Nazar Rabia,Nazir Muhammad Shahid,Hassan Sadaf Ul,Hussain Murid,박영권 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.12

Sea buckthorn (SBT) combines very fascinating nutritional composition with vital vitamins (A, C, E, D, K, and B complexes). Flavonoids, sterols, α-carotene, linoleic acid, and many more unsaturated fatty acids are present in the sea buckthorn plant. The organic extract of SBT seeds is commonly utilized as an anti-aging ingredient in numerous cosmetics. SBT oil extracts are used in pharmaceuticals that treat diseases like diabetes, cancer, cardiovascular disease, and neurological disorders, in addition to cosmetology. In this investigation, various concentrations of organic solvents such as n-hexane, isopropyl alcohol, ethyl acetate, ethanol, methanol, and ascorbic acid (standard) were used for the extraction of oil from sea buckthorn seeds. The antioxidant activity of such extracts was checked by the iron chelating, commonly known as the ferric chloride (FeCl3) method, which is based on the ferric reducing ability of plasma (FRAP) assay with the help of UV-Vis. Our results indicate that seed extract of Hippophae rhamnoides, should be considered as a non-toxic source and the ferric reducing ability of plasma (FRAP) assay is used to evaluate the anti-oxidant potential by various organic solvents. The highest (68%) of FRAP is scavenged by the ethyl acetate and least (53%) of isopropyl extracts.