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Adsorption of Anionic and Cationic Dyes from Textile Effluents by Activated Carbon Prepared from Sawdust and Fish Scale

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Advances in Chemical Engineering and Science 2023年第3期13卷 189-202页

作者： Rumana A. Jahan md. Mahedi Hassan Ashequl Alam Rana Mohammad Mainul karim Centre for Advanced Research in Sciences University of Dhaka Dhaka Bangladesh Department of Applied Chemistry and Chemical Engineering University of Dhaka Dhaka Bangladesh

In Bangladesh, there are thousands of textile-dying industries spread across the country’s many regions, the majority of which involve knitting and dying. The dyeing industry uses an enormous quantity of water, as well as colors and chemicals. After the dying process has been completed, they also release a significant amount of wastewater. Cotton, wool, and polyester fiber are typically dyed with textile dyes such as reactive, acid, and disperse dyes. These dyes are utilized most frequently in the respective sectors. The dyes’ colorants are extremely poisonous and dangerous to all forms of life, including aquatic life and living things. The present work has been intended to investigate whether or not it is practicable to remove commonly used textile dyes simultaneously from an aqueous dye solution using an adsorption technique that makes use of a variety of different adsorbents. This study focuses on the removal of color from two distinct types of dyes—Methylene Blue and Reactive Blue-250 which are cationic and anionic in nature respectively, using two different types of activated carbon adsorbents prepared from sawdust and fish scale. Dye removal capacity was tested as a function of contact time, the dosage of the adsorbent, pH during the treatment process, temperature and initial concentration of dye. The applicability of the Langmuir and Freundlich adsorption isotherms in describing experimental data was investigated. The micro and mesoporous activated carbon prepared from sawdust and fish scale identified by Scanning Electron Microscopy (SEM) images indicated that such adsorbents with a large surface area have more dye adsorption potential whereas the variation in dye adsorption occurs due to variation in surface area. From the overall experimental data, maximum removal of 95.39% and 87.92% was found for Methylene Blue and Reactive Blue-250 respectively by sawdust, and 90.64% removal of Methylene Blue by using fish scale.

关键词： Textile Wastewater Ionic Dyes Removal Activated Carbon Adsorbent

The Prospects of Blue Economy to Promote Bangladesh into a Middle-Income Country

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Open Journal of Marine Science 2018年第3期8卷 355-369页

作者： md. Monjur Hasan B. M. Sajjad Hossain md. Jobaer Alam K. M. Azam Chowdhury Ahmad Al karim Nuruddin md. Khaled Chowdhury School of Law and Political Science Ocean University of China Qingdao China Department of Law Gono Bishwabidyalay (University) Savar Dhaka Bangladesh University of Dhaka Dhaka Bangladesh Department of Oceanography University of Dhaka Dhaka Bangladesh College of Oceanic and Atmospheric Sciences Ocean University of China Qingdao China Ministry of Foreign Affairs Government of the People’s Republic of Bangladesh Dhaka Bangladesh Department of Geology University of Dhaka Dhaka Bangladesh Department of Geosciences Texas Tech University Lubbock USA

This paper draws attention to the prospects of sea-based economy to promote Bangladesh in a middle-income country through the sustainable use of marine resources. About three-fourths of the earth is covered by the seas. It plays the vital role in two important functions from ancient time known as the means of communication and the source of huge living and non-living natural resources. At present, the countries are becoming very much concerned about their marine resources to resolve many of the present and future challenges of their economies. Generally for Bangladesh, ocean is contributing a significant role to its overall socio-economic progress through rising up the economic activities across the country and especially to the coastal zone at southern part. This paper investigates how much Bangladesh is capable to take of or handle the challenges to become a middle income country through the Sustainable Development Goals (SDGs). In addition, it has attempted with a closer-look to find out the barriers or limitations of these activities from different angles if exist.

关键词： Blue Economy Sustainable Development Marine Resources Middle-Income Country Bangladesh

Spatio-temporal variation of cyclone intensity over the coastal region of Bangladesh using 134 years track analysis

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Tropical Cyclone Research and Review 2022年第1期11卷 16-25页

作者： Nm Refat Nasher Kh Razimul karim md.Yachin Islam Department of Geography and Environment Jagannath UniversityBangladesh Graduate School of Human Development and Environment Kobe UniversityJapan Center for Environmental and Geographic Information Services(CEGIS) DhakaBangladesh

The cyclone tracks from 1877 to 2020 were analyzed to detect the spatial and temporal *** tracks were gathered from previously published *** previous articles’tracks were digitized and converted to shape files for analysis in Arc-GIS.A total 126 cyclone tracks were used to detect monthly and seasonal cyclone intensity and spatial *** fluctuations were examined over a 30-year period,which is believed to be the climate of a particular *** cyclones hit the Bay of Bengal’s coast starting in May and lasting until *** May and October,the number of cyclones is at its peak(26 nos in each month).From June through September,the number of cyclones *** October and November,the number of cyclones increased *** number of cyclones substantially fell in December,and no cyclones were observed from January through *** 1939 through 1969,the highest number of cyclones(36)was *** the mid-and latetwentieth century,there were a higher number of *** coastal region of Bangladesh suffered the fewest cyclones in history over the recent era(2001–2020).The western shore was particularly vulnerable from 1877 to 1907,and the entire coastal region was dangerous from 1908 to *** the Post-monsoon(October to December)season,the number of cyclones is lower than in the Monsoon period(May to September).In the pre-monsoon season,71 cyclones strike,while in the Monsoon season,53 cyclones strike.

关键词： Digitize Tropical Seasonal Monthly Strike Coastal

Outcome of Long Segment Transpedicular Screw Fixation in Unstable Thoracolumbar Spine Injury with Incomplete Neurological Deficit

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Journal of Biosciences and Medicines 2020年第3期8卷 166-187页

作者： Shah md. Rezaul karim A. K. M. Shahidur Rahman Syed Abdus Sobhan md. Shahidul Islam Akon Muhammad Akter Hossain Ashraf Ali Shah Newas md. Ruhul Quddus md. Moshiur Rahman Mollick Department of Surgery Sheikh Hasina Medical College Hospital Habiganj Bangladesh Department of Nephrology Bangabandhu Sheikh Mujib Medical University (BSMMU) Dhaka Bangladesh Department of Orthopaedic Surgery Dhaka Medical College Hospital (DMCH) Dhaka Bangladesh Department of Anatomy Chandpur Medical College Chandpur Bangladesh Department of Cardiology Abdul Malek Ukil Medical College Hospital Noakhali Bangladesh Department of Orthopaedic Surgery National Institute of Traumatology and Orthopedic Rehabilitation (NITOR) Dhaka Bangladesh Department of Biochemistry Pabna Medical College Pabna Bangladesh Department of Orthopaedic Surgery Sheikh Hasina Medical College Hospital Habiganj Bangladesh

Background: Long segment transpedicular screw fixation in thoracolumbar spine injury has gained popularity in the last decades as it provides immediate stability, prevents further risk of complications and allows early mobilization of patient. Objectives: Evaluation of clinical and functional outcome after long segment transpedicular screw fixation in unstable thoracolumbar spine injury with incomplete neurological deficit patients. Methods: This quasi experimental study was conducted at Dhaka Medical College and Hospital (DMCH), Dhaka, Bangladesh from January 2016 to December 2017. A total of twenty four (24) patients with traumatic unstable fracture of the thoracolumbar spine with incomplete neurological deficit underwent long segment transpedicular screw fixation were included in this study. Clinical and radiologic outcomes were assessed pre-operatively and post-operatively. Results: A total of 24 patients aged between 20 - 60 years of both sexes (Male-21, Female-03) were included in this study. Their mean (±SD) age was 33.12 (±8.57) years. Most of them were farmer [09 (37.5%)] and day labour [08 (33.33%)]. Motor vehicle accidents were the most common [16 (66.67%)] cause of injury and then fall from height [08 (33.33%)]. The most common level of injury involved was L1-10 (41.67%) patients, followed by L2-07 (29.17%), T12-05 (20.83%) and T11-02 (8.33%) of the study patients. Burst fracture was the commonest [22 (91.67%)] type of fracture followed by Chance fracture [02 (8.33%)]. Pre-operative mean (±SD) Cobb angle, Kyphotic deformation of vertebral body, Beck index and vertebral compression deformity were 21.83 ± 4.5 degrees, 22.09 ± 4.40 degrees, 0.78 ± 2.65 and 0.18 ± 0.93 mm respectively, after procedure which were significantly (p Conclusions: Long segment transpedicular screw fixation is an effective method of treatment in patients having thoracolumbar spine injury with incomplete neurological deficit.

关键词： Neurological Deficit Transpedicular Screw Fixation Unstable Thoracolumbar Spine Injury

De-Speckling of SAR Images with Fuzzy Filters along with Altered Preserved Edge Values

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Journal of Computer and Communications 2022年第3期10卷 10-28页

作者： md. Mynoddin Mohd. Foyzul Kabir Nazrul Islam Rezaul karim Hasin Rehana Sayed Asaduzzaman Department of Computer Science and Engineering Rangamati Science and Technology University Rangamati Bangladesh Department of Software Engineering Daffodil International University Dhaka Bangladesh Department of Information and Communication Technology Mawlana Bhashani Science and Technology University Tangail Bangladesh Department of Mathematics Mawlana Bhashani Science and Technology University Tangail Bangladesh Department of Computer Science and Engineering Daffodil International University Dhaka Bangladesh

In this research, the denoising of speckled SAR image has been done with fuzzy filters (ATMED, TMED, ATMAV & TMAV). SAR image or Synthetic Aperture Radar image consists of the informatics of ISW (Internal solitary waves). A new technique has been proposed which preserved the edge pixels by fuzzy edge detection method and then altered with the filtered image-pixels by fuzzy filtration for getting the denoised image. The comparative result shows that the proposed filter performs better than the other filtered results in terms of PSNR (41.61 dB), MAE (1.47), MSE (4.54) for TMAVxAPE & SSIM (81%) for ATMEDwAPE. The proposed method in this research shows better SSI (Spackle Suppression Index) value. Therefore the experimental result illustrates that the suggested fuzzy filter is much more capable of simultaneously protecting edges and suppressing speckle noise. This research will be beneficial to remove spackle noise from SAR images and can be used for remote sensing and mapping of surface area of earth.

关键词： SAR Image Image Processing Fuzzy Logic Speckle Noise Noise Reduction

Oxidase Enzyme Activities and Their Correlations with Antioxidative Stress Biomarkers in Patients with Acute Coronary Syndrome in Bangladesh

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World Journal of Cardiovascular Diseases 2020年第4期10卷 163-177页

作者： Nourin Ferdausi md. Eahsanul karim Anik Nabila Nawar Binti Laila N. Islam Department of Biochemistry and Molecular Biology University of Dhaka Dhaka Bangladesh

Acute coronary syndrome (ACS) is a range of conditions associated with decreased blood flow in the coronary arteries resulting from sudden rupture of atherosclerotic plaques. Several studies have found that oxidative stress is involved in the initiation and progression of atherosclerosis. The role of oxidase enzymes and antioxidative stress biomarkers in these processes needs further attention. In this study, a total of 120 participants were enrolled which comprised 60 ACS patients and 60 control subjects. The major oxidase enzyme, xanthine oxidase, which plays a pivotal role in the generation of reactive oxygen species (ROS), showed significantly higher activities in both serum (158.03 ± 43.30 mU/mL) and red blood cells (RBC) lysate (309.07 ± 75.73 mU/mL) of the ACS patients compared to controls, 48.51 ± 13.41 mU/mL and 184.10 ± 70.14 mU/mL, respectively. The nicotinamide adenine dinucleotide phosphate (NADPH) oxidase and myeloperoxidase, both of which are major contributors to ROS production, showed significantly higher activities in patients (14.13 ± 3.38 U/L and 10.9 ± 3.3 U/mg) than in controls, 6.90 ± 1.94 U/L and 5.9 ± 1.5 U/mg, respectively. Ceruloplasmin, an emerging biomarker of inflammation, showed significantly higher activity in patients (83.8 ± 26.2 U/L) compared to controls, 70.0 ± 18.9 U/L. The antioxidant enzyme glutathione reductase showed significantly lower activity in patients than controls, 60.7 ± 47.8 U/mL/min and 85.2 ± 49.5 U/mL/min, respectively. Evaluation of cardioprotective biomarkers nitric oxide and high-density lipoprotein-cholesterol (HDL-C) showed significantly lower values in patients. Correlation analyses between these parameters further corroborated increased oxidative stress in patients. These findings suggest that excessive productions of ROS by the oxidase enzymes cause an imbalance between oxidants and antioxidants in favor of oxidants leading to increased oxidative stress in patients with ACS.

关键词： ACS Xanthine Oxidase NADPH Oxidase Ceruloplasmin Glutathione Reductase

Geomorphological, Geological and Engineering Geological Aspects for Sustainable Urban Planning of Mymensingh City, Bangladesh

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Open Journal of Geology 2018年第7期8卷 737-752页

作者： Salma Akter Reshad md. Ekram Ali Shahtaj karim Mahmuda Khatun Mohammad Feruj Alam Geological Survey of Bangladesh Dhaka Bangladesh Jahangirnagar University Dhaka Bangladesh

Geomorphological, geological and engineering geological information is used as the base data to characterize the subsurface condition and for sustainable urban planning and development of the rapidly expanding Mymensingh city. Extensive field work has been completed to get the realistic scenario, data and samples have been collected from surface and subsurface with auguring and geotechnical boring. The laboratory tests have been performed following standard laboratory procedures. Geomorphologically the area is broadly classified into Older Floodplain or Mymensingh Terrace and Younger Floodplain. These two flood plains are separated by Old Brahmaputra River. Geologically the area is mainly covered by the recent alluvial flood plain deposits which are underlain by the Pleistocene Madhupur clay deposits. The Younger Flood Plain deposit consists of mainly unconsolidated fine to medium sands with some silt and clay whereas the Older Flood Plain deposits are mainly consisting of silty clay and fine to medium sand. Moderately compacted sediments of older flood plain deposit are suitable for urban development. Based on geotechnical characteristics and the N values (blow counts of Spontaneous Penetration Test, SPT) of the subsurface sediments, the study area is classified into four Engineering Geological Units. Unit I indicates loose soil and is suitable for shallow foundation. Unit II is indicating compact soil packing;N value of these two units increase with depth and would be good for heavy foundation. Unit III is suitable for shallow structures. Unit IV, which is composed of mostly clay, silty clay and sand with highly compressive organic clay, is recommended to avoid any heavy construction and could be used as open place, water retaining zone etc. Beside the geological and engineering geological study details hydrology and hydrogeological and a systematic study on seismic hazards are strongly recommended before planning of urban area.

关键词： Geology Engineering Geology Standard Penetration Test (SPT)

Developing Denim Like Wash Effect on Corduroy Garments and Investigation of Different Physical Properties of Washed Corduroy Garments

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Journal of Textile Science and Technology 2021年第1期7卷 1-13页

作者： Gazi Farhan Ishraque Toki Akash Banik Taosif Ahmed Rony Mia Rezaul karim Khan Alave Jarin Jahan md. Mostafizur Rahman Palash md. Salman Farsee Department of Textile Engineering National Institute of Textile Engineering & Research (NITER) Savar Dhaka Bangladesh School of Environmental Engineering Wuhan Textile University Wuhan China College of Chemistry & Chemical Engineering Wuhan Textile University Wuhan China School of Technical Research Wuhan Textile University Wuhan China Department of Textile Engineering Pabna Textile Engineering College (PTEC) Shalgaria Pabna Bangladesh

Corduroy yarn is generally introduced in a fabric structure of garments due to developing different designs in terms of appearance of fabric which is called corduroy garment. In this study, both corduroy and denim garments have been made to develop a denim-like wash effect on corduroy garments that will create a new fashion, value addition and sustainability in washing technology. Both the garments are treated with the same washing process. Also, some physical properties have been investigated for both washed garments such as Washing Effect Test, Tear Strength Test, GSM Test, and Rubbing Test. Then a comparative study has been done on both washed garments. The appearance of washed corduroy garments is satisfactory. The physical properties also show a better result. Finally, a satisfactory result is achieved from this work.

关键词： Washing and Finishing Treatments Denim Corduroy Rubbing Test Tearing Strength Gram Per Square Meter Test

A Security System for Kindergarten School Using RFID Technology

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Journal of Computer and Communications 2019年第4期7卷 21-30页

作者： Salma Nazia Rahman Shikder Shafiul Bashar md. Abdullah Al Mahmud md. Sazal Miah A. H. M. Zadidul karim Maliha Marium Department of Electrical and Electronic Engineering University of Asia Pacific Dhaka Bangladesh Department of Computer Science and Engineering University of Asia Pacific Dhaka Bangladesh

An RFID (Radio Frequency Identification) based security and access control system is proposed in this paper. Recently, a crime against children is increasing in higher rate and it is high time to offer a safety system for the school going children. In this work, our aim is to build a security system to keep the student secure. This system provides a unique identification number that is RFID card. Generally, the RFID card will be scanned in an RFID reader. RFID reader will send data to Arduino where the database program is previously set. Arduino programs are written in C language. If anyone remains absent after school starts, the GSM module will send an automated SMS to his or her parents. Students may need to leave school for an emergency case. Then he/she can take special permission from the administration. There is a button set for the administration to open the gate immediately for this reason. Parents will be provided RFID card from the school authority. Because student card won’t work for the second time in a day. So parents will have to scan their card after school to receive their children. And their card will only work after school. Hence, the risks of any occurrence are reduced and ensured the safety of the student.

关键词： Radio Frequency Identification Ardunio Safety System GSM