EDTA-functionalized mesoporous silica for the removal of corrosion products: Adsorption studies and performance evaluation under gamma irradiation

Iqbal, Sajid,Yun, Jong-Il Elsevier 2017 Microporous and mesoporous materials Vol.248 No.-

<P><B>Abstract</B></P> <P>Ethylenediaminetetraacetic acid functionalized mesoporous silica (EDTA-SBA-15) was synthesized and used to efficiently remove corrosion products like Co(II), Ni(II), and Cu(II) generated in nuclear reactor coolants. The mesoporosity, long range order, and functional group loadings were confirmed by N<SUB>2</SUB> adsorption/desorption, small angle x-ray scattering (SAXS), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR) techniques. The improved loading of EDTA on the SBA-15 surface significantly increased its adsorption capacity (1.33–1.44 mmol/g) for the above-mentioned corrosion products. Additionally, the fast equilibrium adsorption kinetics (<20 min) was observed, and the experimental data fitted the pseudo second order model. Complete sequestration of Co(II), Ni(II), and Cu(II) from their equimolar mixture was achieved with the optimum adsorbent dose. EDTA-SBA-15 had good stability over a wide pH range from 1 to 6 as well as in concentrated ionic media and at temperatures up to 75 °C. This study further evaluated the performance of the EDTA-SBA-15 under gamma irradiation. The results suggest that it has potential for use in the decontamination of radioactive corrosion products from the primary coolant system of nuclear power plants.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The adsorbent showed an excellent adsorption capacity for metal ions. </LI> <LI> The adsorbent is feasible to use for radioactive decontamination. </LI> <LI> The adsorbent retains its adsorption properties under different conditions. </LI> <LI> Complete sequestration of metal ions can be achieved within 20 min. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Computer-assisted brain tumor type discrimination using magnetic resonance imaging features

Sajid Iqbal,M. Usman Ghani Khan,Tanzila Saba,Amjad Rehman 대한의용생체공학회 2018 Biomedical Engineering Letters (BMEL) Vol.8 No.1

Medical imaging plays an integral role in theidentification, segmentation, and classification of braintumors. The invention of MRI has opened new horizons forbrain-related research. Recently, researchers have shiftedtheir focus towards applying digital image processingtechniques to extract, analyze and categorize brain tumorsfrom MRI. Categorization of brain tumors is defined in ahierarchical way moving from major to minor ones. Aplethora of work could be seen in literature related to theclassification of brain tumors in categories such as benignand malignant. However, there are only a few worksreported on the multiclass classification of brain imageswhere each part of the image containing tumor is taggedwith major and minor categories. The precise classificationis difficult to achieve due to ambiguities in images andoverlapping characteristics of different type of tumors. Inthe current study, a comprehensive review of recentresearch on brain tumors multiclass classification usingMRI is provided. These multiclass classification studies arecategorized into two major groups: XX and YY and eachgroup are further divided into three sub-groups. A set ofcommon parameters from the reviewed works is extractedand compared to highlight the merits and demerits ofindividual works. Based on our analysis, we provide a setof recommendations for researchers and professionalsworking in the area of brain tumors classification.

Recent development in hybrid conducting polymers: Synthesis, applications and future prospects

Sajid Iqbal,Sharif Ahmad 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-

The hybrid conducting polymers (HCPs) possesses unusual properties of both conducting polymers (CPs) and organic/inorganic nanoparticles, which drawn much attraction to the scientist and researchers. The processing of HCPs have helped in overcoming the drawbacks associated with CPs such as poor processability, solubility, stability and low yield. In view of this, the present review article highlights the important synthesis techniques of HCPs and their conduction mechanism. Additionally, much attention has been paid to their diverse applications in energy storage devices, EMI shielding, sensors, biomedicals, anti-corrosive coatings. Finally, the future prospects and current challenges of such polymers have also been overviewed.

Adsorption Study of Co(II) by EDTA-Functionalized Nanoporous Silica

Sajid Iqbal,Jong-Il Yun 한국방사성폐기물학회 2016 한국방사성폐기물학회 학술논문요약집 Vol.2016 No.10

Corrigendum to “Environmentally benign and novel management route for radioactive corrosion products by hydroxyapatite” [J. Nucl. Mater. 507 (2018) 218–225]

Iqbal, Sajid,Hassan, Muhmood ul,Ryu, Ho Jin,Yun, Jong-Il Elsevier 2018 JOURNAL OF NUCLEAR MATERIALS Vol.508 No.-

Environmentally benign and novel management route for radioactive corrosion products by hydroxyapatite

Iqbal, Sajid,Hassan, Muhmood ul,Ryu, Ho Jin,Yun, Jong-Il Elsevier 2018 JOURNAL OF NUCLEAR MATERIALS Vol.507 No.-

<P><B>Abstract</B></P> <P>A novel and environmentally benign route for the direct solidification of captured corrosion products (Co, Cr, Fe, Ni, Cu, Zn, and Mn) generated from the primary coolant system of nuclear power plants is introduced in this study. Synthesized calcium hydroxyapatite was used to remove individual and mixtures of corrosion products from aqueous solutions. The results show more than a 95% removal of these corrosion products for both cases. The direct solidification of adsorbed corrosion products was done by pressure-less conventional sintering. The sintered matrix revealed a good hardness (3.70 ± 0.60 GPa) and a relative sintered density > 98% after heat treatment at 1150 °C. The measured compressive strength (207.3 ± 9.5 MPa) was significantly higher than the established waste immobilization criteria of the US (3.5 MPa) and Russia (4.9 MPa). The corrosion products consolidated matrix had a normalized leaching rate ranging from 3.4⨯10<SUP>−2</SUP> to 3.1⨯10<SUP>−6</SUP> g/m<SUP>2</SUP>/day. Moreover, no additional chemical treatments, additives (gypsum, slaked lime, sodium silicate, etc.), and sophisticated equipment were needed for the adsorption and solidification process. Therefore, the proposed waste management route has no adverse effects on the ecosystem and can be highly efficient to immobilize adsorbed waste and to reduce the secondary waste volume.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The direct solidification of the captured corrosion products by HA has been investigated. </LI> <LI> No organic binders were used for solidification of M-HA matrix. </LI> <LI> The sintered matrix showed good densification and mechanical properties. </LI> <LI> ASTM PCT test approved the chemical durability of sintered matrix. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Optimization of Metakaolin-Based Geopolymer for Solidification of Cesium and Molybdenum

Sajid Iqbal,Jong-Il Yun 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2

The sustainability of the nuclear power industry hinges increasingly on the safe, long-term disposal of radioactive waste. Despite significant innovations and advancements in nuclear fuel and reactor design, the quest for a permanent solution to handle accumulating radioactive waste has received comparatively less attention. Conventionally, two widely recognized solidification methods, namely cementation for low and intermediate-level waste and vitrification for high-level waste, have been favored due to their simplicity, affordability, and availability. Recently, geopolymers have emerged as an appealing alternative, gaining attention for their minimal carbon footprint, robust chemical and mechanical properties, cost-effectiveness, and capacity to immobilize a broad spectrum of radionuclides, including radioactive organic compounds. This study delves into the synthesis of metakaolin-based geopolymers tailored for the immobilization of fission products like cesium (Cs) and molybdenum (Mo). The investigation unfolded in two key steps. In the initial step, we optimized the alkali content to prevent the occurrence of efflorescence, a potential issue. Remarkably, as the Na2O/Al2O3 ratio increased from 0.82 to 1.54, we observed significant enhancements in both compressive strength (11.45 to 27.07 MPa) and density (up to 2.23 g/cm3). This suggests the importance of careful adjustment in achieving the desired geopolymer characteristics. The second phase involved the incorporation of 2wt% of Cs and Mo, both individually and as a mixture, into the geopolymer matrix. We prepared the GP paste, which was poured into cylindrical molds and cured at 60°C for one week. To scrutinize the crystallinity, phase purity, and bonding type of the developed matrix, we employed XRD and FTIR techniques. Additionally, we conducted standard compressive strength tests (following ASTM C39/C39M-17b) to assess the stacking durability and robustness of the developed waste form, vital for storage, handling, transportation, and disposal in a deep geological repository. Furthermore, to evaluate the chemical durability, diffusivity and leaching of the GP waste matrix, we employed the ASTM standard Product Consistency Test (PCT: C 1285-02) and American nuclear society’s devised leaching test (ANS 16.1). It is noteworthy that the introduction of Cs and Cs/Mo in the GP matrix led to a reduction of more than 50% and 60% in compressive strength, respectively. This outcome may be attributed to the interference of Cs and Mo with the geopolymerization process, potentially causing the formation of new phases. However, it is crucial to emphasize that both developed matrices exhibited an acceptable normalized leaching rate of less than 10-5 g·m-2·d-1. This finding underscores the promising potential of the GP matrix for the immobilization of cationic and anionic radioactive species, paving the way for more sustainable nuclear waste management practices.

ON SOME WEIGHTED HARDY-TYPE INEQUALITIES INVOLVING EXTENDED RIEMANN-LIOUVILLE FRACTIONAL CALCULUS OPERATORS

Iqbal, Sajid,Pecaric, Josip,Samraiz, Muhammad,Tehmeena, Hassan,Tomovski, Zivorad Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.1

In this article, we establish some new weighted Hardy-type inequalities involving some variants of extended Riemann-Liouville fractional derivative operators, using convex and increasing functions. As special cases of the main results, we obtain the results of [18,19]. We also prove the boundedness of the k-fractional integral operator on L_p[a, b].

New Butyrylcholinesterase Inhibitory Triterpenes from Salvia santolinifolia

Sajid Mehmood,Naheed Riaz,Sarfraz Ahmed Nawaz,Nighat Afza,Abdul Malik,Muhammad Iqbal Choudhary 대한약학회 2006 Archives of Pharmacal Research Vol.29 No.3

Slavins A (1) and B (2), the new amyrin type triterpenes, have been isolated from the chloroform soluble fraction of Salvia santolinifolia and assigned structures on the basis of spectral studies including 2D NMR. Both the compounds displayed inhibitory potential against the enzyme butyrylcholinesterase.

Surgical Site Infection Following Fixation of Acetabular Fractures

( Faizan Iqbal ),( Sajid Younus ),( Asmatullah ),( Osama Bin Zia ),( Naveed Khan ) 대한고관절학회 2017 Hip and Pelvis Vol.29 No.3

Purpose: Acetabular fractures are mainly caused by high energy trauma. Surgical fixation of these fractures requires extensive surgical exposure which increases the length of operation and blood loss as well. This may increase the risk of surgical site infection. Our aim is to evaluate the prevalence of surgical site infections and the risk factors associated with it so as to minimize its chances. Materials and Methods: A total of 261 patients who underwent acetabular fracture surgery were retrospectively reviewed. Patients were divided into 2 groups, with or without surgical site infection. Factors examined include patients` gender, age, body mass index (BMI), time between injury and surgery, operative time, estimated blood loss, number of packed red blood cell transfused, length of total intensive care unit (ICU) stay, fracture type, surgical approach, smoking status, patients` comorbids and associated injuries. Results: Fourteen patients (5.4%) developed surgical site infection. Out of 14 infections, 4 were superficial and 10 were deep. The factors that were found to be associated with surgical site infection following acetabular fracture fixation were prolonged operation time, increased BMI, prolonged ICU stay, larger amount of packed red blood cell transfused and associated genitourinary and abdominal trauma. Conclusion: In our study, we conclude that measures should be undertaken to attenuate the chances of surgical site infection in this major surgery by considering the risk factors significantly associated with it.