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RISS 인기검색어
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- 저자 : Hussain Qasim, Gullam (검색결과 5 건)
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Qasim, Ghulam Hussain,Lee, Sangwook,Lee, Giehyeon,Lee, Woojin,Hong, Yongseok,Han, Seunghee The Royal Society of Chemistry 2018 Environmental science Vol.4 No.10
<P>A series of batch experiments were conducted to identify the effects of dissolved oxygen (DO) and nitrate on the removal and reduction of Hg(ii) by a pumice supported nanoscale zero-valent iron (p-nZVI) composite. After the adsorption and consecutive reduction of Hg(ii) in an anoxic solution, zero-valent iron, and ferrous and ferric irons were found on the surface of the p-nZVI with a chain-like structure; while in the oxic solution, a thick ferric shell was found on the surface of the p-nZVI with collapsed chain structures. In Hg(ii) sorption isotherm tests, with 25, 250, 1000, and 2500 nM of Hg(ii), the Hg(ii) sorption capacity of the p-nZVI was 6.1 mg g<SUP>−1</SUP> in the oxic aqueous solution and 1.5 mg g<SUP>−1</SUP> in the anoxic aqueous solution. While the adsorption of Hg(ii) was more favorable in the presence of DO, the headspace Hg(0), as well as dissolved Fe(ii), was largely increased in the absence of DO. The removal of Hg(ii) in oxic and anoxic suspensions was not affected by nitrate levels ranging from 0.08 to 8 mM. In contrast, Hg(0) concentration in headspace increased with an increase of nitrate, which was related to the enhanced dissolved Fe(ii) production. The experimental results of this study suggest that the absence of DO and the presence of nitrate in groundwater could significantly increase Hg(0) in groundwater and adjacent atmosphere during the usual remediation process using relevant nZVI techniques. The effective capture and treatment methods of Hg(0) should be developed for better application of p-nZVI-based technologies.</P>
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Resilience Assessment Framework for an Urban Road Network Subjected to Disruptions
Syed Qasim Abbas Kazmi,Syed Ahsan Ali Naqvi,Etikaf Hussain,Shoaib Ahmed 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.12
This research paper introduces a novel framework for assessing the resilience of urban transport networks. Traditional approaches to quantify resilience primarily focus on evaluating resilience based on the accessibility and vulnerability of network links. However, this study proposes a different approach by considering the dynamic role of links within the overall network, including their ability to accommodate additional traffic demand from other links. To accomplish this, a comprehensive scanning network approach is implemented using an iterative traffic assignment performed. The framework is applied to the urban transport network of Karachi, Pakistan. The model incorporates parameters for calibrations derived from volume delay functions, specifically alpha and beta, which are obtained from actual traffic travel times during free-flow and peak hours. The accuracy of the model is validated by comparing observed traffic counts at various locations with the simulated traffic volumes, resulting in an average error of 9% and a standard deviation of 7.4%. The study’s findings reveal significant losses within the network and identify critical links that are particularly susceptible to disruptions. The analysis provides valuable insights into delays experienced by travellers and the additional distances travelled when specific links are closed. Furthermore, the framework enables the evaluation of the overall impacts of disruptions at the network level. The proposed methodology will allow traffic engineers and decision-makers to effectively plan rerouted through alternative links during disruptions.
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Polypyrrole multilayer-laminated cellulose for large-scale repeatable mercury ion removal
Hanif, Zahid,Lee, Seyeong,Hussain Qasim, Gullam,Ardiningsih, Indah,Kim, Jeong-Ah,Seon, Jaeyoung,Han, Seunghee,Hong, Sukwon,Yoon, Myung-Han The Royal Society of Chemistry 2016 Journal of materials chemistry. A, Materials for e Vol.4 No.32
<P>In this research, we report a polypyrrole (PPy) multilayer-laminated cellulose network aimed at the cost-effective removal of aqueous potentially toxic metal ions with high adsorption efficiency and good adsorbent recyclability. The preparation of conformal adsorbent coatings on a fibrous cellulose network was accomplished by performing multiple cycles of simple dip-coating of a non-toxic oxidant and vapor-phase polymerization of PPy. The resultant PPy multilayer-deposited cellulose exhibited stable adhesion between the vapor-deposited PPy and the underlying cellulose support even in a strongly acidic solution. Using this non-hazardous hybrid adsorbent, mercury ions could be efficiently adsorbed over a large pH range with a maximum specific adsorption capacity of 31.689 mg g<SUP>−1</SUP>, either in the form of a thick suspended adsorbent for large-scale decontamination or a thin dripper-type membrane for portable water purification. Furthermore, the PPy multilayer-laminated cotton fabric enabled the large-scale repetitive removal of mercury ions (100 ppm, 1 liter) with efficiency above 91%. This study suggests that the PPy-cotton hybrid may serve as a large-scale, economical, and recyclable decontamination platform for efficient removal of highly potentially toxic metal ions (<I>e.g.</I>, Hg(ii) and Cr(vi)), which could be beneficial for water purification, particularly in resource-limited locations.</P>
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Seah, Kahyee Cary,Qasim, Ghulam Hussain,Hong, Yong Seok,Kim, Eunsuk,Kim, Kyung Tae,Han, Seunghee Elsevier 2017 Estuarine, coastal and shelf science Vol.188 No.-
<P>Colloidal Cu speciation along the salinity gradient in the Mekong River Delta was investigated using diffusive gradients in thin films (DGT) probes equipped with diffusive layers that had nominal pore sizes of 390 nm (DGT(390)) and 45 nm (DGT(45)). An open pore gel made of 1.5% agarose was used for the 390 nm pore size cutoff, and a restricted gel made of 40% acrylamide monomer was used for the 45 nm cutoff. When DGT390 and DGT45 were deployed in a 0.01 M NaNO3 solution for up to four days, the mean ratio of Cu accumulated in DGT390 to dissolved Cu (dCu) (<0.45 gm) was 1.0, and Cu accumulated in DGT45 to dCu was 0.98. By contrast, when DGT390 and DGT45 probes were deployed in Mekong River water of salinity 0, the ratio increased with increasing deployment time, from 0.15 to 1.0 for DGT390 and from 0.02 to 0.52 for DGT45, for four days. This demonstrates that the slow dissociation of colloidal Cu complex confines the rapid accumulation of colloidal Cu in DGT45, implying the potential of DGT probes for colloidal Cu monitoring. The same DGT probes were deployed in the Mekong River in order to test its in situ applicability. The colloidal fraction, determined by the difference between dCu and Cu accumulated in DGT45, ranged from 67% to 77% of dCu at the low-salinity sites but from 8.7% to 9.1% of dCu at the brackish sites. A large amount of particle suspension typically found at the salinity front of the Mekong River seemed to play a critical role in the transport of Cu by providing dCu and organic colloids from suspended sediment. Based on our test results, employing DGT probes is likely a promising method for monitoring colloidal Cu in natural water. (C) 2017 Elsevier Ltd. All rights reserved.</P>
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