Kinetics, isothermal and mechanistic insight into the adsorption of eosin yellow and malachite green from water via tri-metallic layered double hydroxide nanosheets

Muhammad Altaf Nazir,Tayyaba Najam,Muhammad Sohail Bashir,Muhammad Sufyan Javed,Muhammad Aswad Bashir,Muhammad Imran,Umair Azhar,Syed Shoaib Ahmad Shah,Aziz ur Rehman 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.1

The use of highly efficient, environment-friendly and economically inexpensive materials for the adsorption removal of contaminants from water has always been considered as emerging task. In this study, we synthesized hybrid tri-metallic nickel cobalt layered double hydroxide (NiCoAl-LDH) porous material for the adsorption removal of Eosin yellow (EY) and Malachite green (MG) from water. The characterization results disclosed that tri-metallic LDH has been synthesized with extraordinary purity, identical morphology and high surface area (134.21 m2·g−1). The NiCoAl-LDH performs the best for adsorption of EY (qe=37.30mg·g−1 at pH=2) and MG (qe=39.61 mg·g−1 at pH=10). The Langmuir and Freundlich isotherm models were applied to explain the adsorption process of dyes on the surface of LDH. The Langmuir model (R2=0.991 and 0.999 for Eosin Y and Malachite G, respectively) was very appropriate to explain the process of adsorption on NiCoAl-LDH as homogeneous (monolayer). The maximum adsorption capacity of EY and MG calculated with Langmuir model was 78.74 and 110.13 mg·g−1 at 30 °C, respectively. Also with 240 minutes contact time 94.8% EY and 89.9% MG was adsorbed by as synthesized NiCoAl-LDH nanosheets. The NiCoAl-LDH nanosheets showed excellent performance of reusability of up to five regeneration cycles. The results showed that the adsorption capacity of NiCoAl-LDH nanosheets after five regeneration cycles, to adsorb EY, decreased only from 40.80 to 36.93 mg·g−1 and that of MG from 79.21 to 75.42 mg·g−1, which is acceptable. The overall results Suggest that the fabricated NiCoAl-LDH is favorable for the purification of dye contaminated water.

Highly Efficient Mg0.75Ce0.25Fe12O19 @ZIF-67 Heterojunction Co-catalyst for Photo-reduction of Rhodamine B

Nazir Muhammad Altaf,Jamshaid Muhammad,Altaf Muhammad,Najam Tayyaba,Al-Mohaimeed Amal M.,Al-onazi Wedad A.,Rehman Aziz ur,Shah Syed Shoaib Ahmad 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.8

This research presents a comprehensive investigation into the synthesis and application of novel composite photocatalysts, namely Mg 0.75 Ce 0.25 Fe 12 O 19 @ZIF-67 for the degradation of Rhodamine B (RhB) dye under sunlight irradiation. The synthesis involved the preparation of Mg 0.75 Ce 0.25 Fe 12 O 19 and ZIF-67 frameworks, followed by the fabrication of the composite catalyst. Various characterization techniques, such as XRD, SEM, EDX, and FTIR, were employed to assess the structural, morphological, and compositional properties of the synthesized materials. Photocatalytic experiments were conducted to evaluate the effi ciency of the catalysts in degrading RhB, revealing remarkable enhancement in degradation effi ciency (90%) using the composite photocatalyst compared to individual components. The eff ects of catalyst type, dosage, and pH on the degradation process were systematically investigated. Furthermore, a proposed mechanism elucidated the role of the Mg 0.75 Ce 0.25 Fe 12 O 19 @ZIF-67 cocatalyst for RhB degradation under solar light, highlighting the generation of radicals as key contributors for degradation process.

Human hand gesture identification framework using SIFT and knowledge-level technique

Muhammad Haroon,Saud Altaf,Zia-ur- Rehman,Muhammad Waseem Soomro,Sofia Iqbal 한국전자통신연구원 2023 ETRI Journal Vol.45 No.6

In this study, the impact of varying lighting conditions on recognition and decision-making was considered. The luminosity approach was presented to increase gesture recognition performance under varied lighting. An efficient framework was proposed for sensor-based sign language gesture identification, including picture acquisition, preparing data, obtaining features, and recognition. The depth images were collected using multiple Microsoft Kinect devices, and data were acquired by varying resolutions to demonstrate the idea. A case study was designed to attain acceptable accuracy in gesture recognition under variant lighting. Using American Sign Language (ASL), the dataset was created and analyzed under various lighting conditions. In ASL-based images, significant feature points were selected using the scale-invariant feature transformation (SIFT). Finally, an artificial neural network (ANN) classified hand gestures using specified characteristics for validation. The suggested method was successful across a variety of illumination conditions and different image sizes. The total effectiveness of NN architecture was shown by the 97.6% recognition accuracy rate of 26 alphabets dataset with just a 2.4% error rate.

Elemental Composition of the Soils using LIBS Laser Induced Breakdown Spectroscopy

Muhammad Aslam Khoso,Seher Saleem,Altaf H. Nizamani,Hussain Saleem,Abdul Majid Soomro,Waseem Ahmed Bhutto,Saifullah Jamali,Nek Muhammad Shaikh International Journal of Computer ScienceNetwork S 2024 International journal of computer science and netw Vol.24 No.6

Laser induced breakdown spectroscopy (LIBS) technique has been used for the elemental composition of the soils. In this technique, a high energy laser pulse is focused on a sample to produce plasma. From the spectroscopic analysis of such plasma plume, we have determined the different elements present in the soil. This technique is effective and rapid for the qualitative and quantitative analysis of all type of samples. In this work a Q-switched Nd: YAG laser operating with its fundamental mode (1064 nm laser wavelength), 5 nanosecond pulse width, and 10 Hz repetition rate was focused on soil samples using 10 cm quartz lens. The emission spectra of soil consist of Iron (Fe), Calcium (Ca), Titanium (Ti), Silicon (Si), Aluminum (Al), Magnesium (Mg), Manganese (Mn), Potassium (K), Nickel (Ni), Chromium (Cr), Copper (Cu), Mercury (Hg), Barium (Ba), Vanadium (V), Lead (Pb), Nitrogen (N), Scandium (Sc), Hydrogen (H), Strontium (Sr), and Lithium (Li) with different finger-prints of the transition lines. The maximum intensity of the transition lines was observed close to the surface of the sample and it was decreased along the axial direction of the plasma expansion due to the thermalization and the recombination process. We have also determined the plasma parameters such as electron temperature and the electron number density of the plasma using Boltzmann's plot method as well as the Stark broadening of the transition lines respectively. The electron temperature is estimated at 14611 °K, whereas the electron number density i.e. 4.1 × 10¹⁶ cm^-3 lies close to the surface.

Prevalence and Sociodemographic Factors of Overweight and Obesity among Pakistani Adults

Muhammad Asif,Muhammad Aslam,Saima Altaf,Saima Atif,Abdul Majid 대한비만학회 2020 The Korean journal of obesity Vol.29 No.1

Background: Obesity is a serious public health problem that is growing alarmingly worldwide. The main objective of this study is to examine the current prevalence of overweight and obesity among Pakistani adults and to identify the sociodemographic factors that are associated with overweight and obesity. Methods: Secondary data from a population-based household survey (the Pakistan Panel Household Survey) were used for this study. A total of 10,063 participants (3,916 men and 6,147 women) were included. Overweight and obese individuals were identified using the World Health Organization-recommended cutoffs for body mass index (kg/m2). Along with descriptive statistics, the Pearson chi-square test was used to investigate the association among categorical variables. Odds ratios (ORs) along with 95% confidence intervals (CIs) were estimated using univariate logistic regression analysis to evaluate the most significantly associated risk factors for overweight/obesity. Results: The mean age and body mass index of the participants were 38.2 years and 22.9 kg/m2, respectively. Overall, 22.8% of the participants (23.9% of the women and 21.1% of the men) were overweight, and 5.1% (6.3% of the women and 3.2% of the men) were obese. Sociodemographic factors, such as sex, marital status, and residential area, were significantly associated with body mass index categories. Women (OR, 1.34; 95% CI, 1.23–1.47; P<0.01), ever-married individuals (OR, 1.92; 95% CI, 1.70–2.16; P<0.01), and individuals living in urban areas (OR, 1.23; 95% CI, 1.12–1.35; P<0.01) were more likely to become overweight/obese than their counterparts. Conclusion: We have found the excess weight problem to be quite high in the Pakistani adult population. The government and other health agencies should take initiatives in launching programs about nutritional awareness for adults to prevent obesity.

Application of Disaster Management Cycle on Flood Risk in Urban Areas of Pakistan: A Review

Muhammad Azam,Jae Eun Lee,Zeeshan Waheed,Muhammad Nauman Altaf 위기관리 이론과 실천 2021 Disastronomy Vol.4 No.1

A disaster prevention and mitigation cycle seem to be generally well-known tool in dealing with disasters as well as their consequences. Furthermore, use of this cycle in urban areas is still into doubt. As a result, this study takes a practical strategy to identify problems within its traditional disaster risk management cycle as well as its stages in the scenario of increasing urban floods throughout Pakistan. Semi-structured queries were used to examine flood risk management organizations. Three focus group talks were also undertaken to have a better understanding of the perspectives of various populations. Under each step, thematic analysis was utilized to classify opinions and responses. The results showed that climate change adaptation has become a critical component of long-term disaster risk reduction.

Mid-upper-arm circumference as a screening measure for identifying children with elevated body mass index: a study for Pakistan

Muhammad Asif,Muhammad Aslam,Saima Altaf 대한소아청소년과학회 2018 Clinical and Experimental Pediatrics (CEP) Vol.61 No.1

Purpose: Mid-upper-arm circumference (MUAC) is considered an alternative screening method for obesity. The aims of this investigation were to examine the ability of MUAC to correctly identify children with elevated body mass index (BMI) and to determine the best MUAC cutoff point for identification of children with high BMI. Methods: Anthropometric measurements (height, weight, and MUAC) from a cross-sectional sample of 7,921 Pakistani children aged 5–14 years were analyzed. Pearson correlation coefficients between MUAC and other anthropometric measurements were calculated. Receiver operating characteristic curve analysis was used to determine the optimal MUAC cutoff point for identifying children with high BMI. Results: Among 7,921 children, the mean (±standard deviation) age, BMI, and MUAC were 10.00 (±2.86 years), 16.16 (±2.66 kg/m2), and 17.73 (±2.59 cm), respectively. The MUAC had a strong positive correlation with BMI. The optimal MUAC cutoff points indicating elevated BMI in boys ranged from 16.76 to 22.73, while the corresponding values in girls ranged from 16.38 to 20.57. Conclusion: MUAC may be used as a simple indicator of overweight/obesity in children, with reasonable accuracy in clinical settings.

Anthropogenic impact on the distribution of the birds in the tropical thorn forest, Punjab, Pakistan

Muhammad Altaf,Arshad Javid,Abdul Majid Khan,M.S.H. Khan,Muhammad Umair,Zulfiqar Ali 국립중앙과학관 2018 Journal of Asia-Pacific Biodiversity Vol.11 No.2

The present research was conducted to assess the anthropogenic impacts on avian diversity around the river Chenab, Pakistan. The avian diversity was recorded on different landscapes along the river Chenab, that is, forest, agricultural, rural, and urban habitats. The data on diversity and distribution of various avian species were collected through linear count along with direct count methods viz. personal observations and sound records and indirect count methods viz. presences of carcasses and meeting with local communities. The habitat preferences of birds varied significantly. A decline in avian diversity was observed from forest habitat to urban landscapes. One year of bird surveys compiled a total of 150 species from all habitats along the river Chenab. Computed statistical data show that Shannon's index provides a quantitative report of diversity which was highest at forest habitat (4.261) followed by rural forest habitat (3.746), agri–rural habitat (3.746), agriculture habitat (3.623), WLH (2.723), urban vegetative habitat (3.215), and very least at urban nonvegetative habitat (2.247). It can be concluded from the present study that many of the avian species have specific habitats and also noted that corridors and connections among different landscapes are important for the conservation of avian diversity.

Mid-upper-arm circumference as a screening measure for identifying children with elevated body mass index: a study for Pakistan

Asif, Muhammad,Aslam, Muhammad,Altaf, Saima The Korean Pediatric Society 2018 Clinical and Experimental Pediatrics (CEP) Vol.61 No.1

Purpose: Mid-upper-arm circumference (MUAC) is considered an alternative screening method for obesity. The aims of this investigation were to examine the ability of MUAC to correctly identify children with elevated body mass index (BMI) and to determine the best MUAC cutoff point for identification of children with high BMI. Methods: Anthropometric measurements (height, weight, and MUAC) from a cross-sectional sample of 7,921 Pakistani children aged 5-14 years were analyzed. Pearson correlation coefficients between MUAC and other anthropometric measurements were calculated. Receiver operating characteristic curve analysis was used to determine the optimal MUAC cutoff point for identifying children with high BMI. Results: Among 7,921 children, the mean (${\pm}$standard deviation) age, BMI, and MUAC were 10.00 (${\pm}2.86years$), 16.16 (${\pm}2.66kg/m^2$), and 17.73 (${\pm}2.59cm$), respectively. The MUAC had a strong positive correlation with BMI. The optimal MUAC cutoff points indicating elevated BMI in boys ranged from 16.76 to 22.73, while the corresponding values in girls ranged from 16.38 to 20.57. Conclusion: MUAC may be used as a simple indicator of overweight/obesity in children, with reasonable accuracy in clinical settings.

Experimental and numerical characterization of mechanical properties of carbon/jute fabric reinforced epoxy hybrid composites

Aakash Ali,Muhammad Ali Nasir,Muhammad Yasir Khalid,Saad Nauman,Khubab Shaker,Shahab Khushnood,Khurram Altaf,Muhammad Zeeshan,Azhar Hussain 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.9

Natural fiber composites have great potential for reducing the product cost, lowering weight and enhancing renewability. Functionality and performance of natural fibers can be enhanced many folds using them together with synthetic fibers. Hybridization of carbon and low-cost natural jute fiber offers a sustainable hybrid composite having high modulus and mechanical strength. This study investigates flexural behavior of carbon/jute epoxy composites experimentally and numerically. Also, impact response is characterized through drop weight method. Study concludes that flexural strength decreases with increase in jute percentage. Simulation of flexural behavior diverges more than 10 % from experimental results. This anomaly is due to waviness of fiber resulting in heterogeneous property distribution in composites. Further, the fracto-graphic study revealed modes of failure. The drop weight impact tests reveal increased damage area with increase in jute percentage.