Shakhawat H. Firoz

Bangladesh University of Engineering and Technology

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Chanchal Kumar Roy

Bangladesh University of Engineering and Technology

Akter Hossain Reaz

Bangladesh University of Engineering and Technology

Hridoy Roy

Bangladesh University of Engineering and Technology

Yeasin Arafat Tarek

Bangladesh Council of Scientific and Industrial Research

Al‐Nakib Chowdhury

Bangladesh University of Engineering and Technology

Mohammad Mozammal Hosen

Bangladesh Atomic Energy Commission

Md. Mominul Islam

Sher-e-Bangla Agricultural University

Ragib Shakil

Bangladesh University of Engineering and Technology

Mahmuda Akter

Universiti Malaysia Pahang Al-Sultan Abdullah

Md. Shahinoor Islam

Bangladesh University of Engineering and Technology

Cooperative Institutions

Bangladesh University of Engineering and Technology

University of Dhaka

Shahjalal University of Science and Technology

University of Queensland

National Institute for Materials Science

Bangladesh Council of Scientific and Industrial Research

Griffith University

Bangladesh Atomic Energy Commission

Brisbane School of Theology

King Fahd University of Petroleum and Minerals

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Synthesis, Characterization and Performance Evaluation of Burmese Grape (Baccaurea ramiflora) Seed Biochar for Sustainable Wastewater Treatment

Water (2023)

Hridoy Roy Dipayan Sarkar Md. Nahid Pervez Shuvo Paul Yingjie Cai

Biochar prepared from different bio-sources serves as a feasible solution for the decontamination of dye-contaminated wastewater. In this study, biochar was synthesized from a sustainable source, i.e., local fruit waste, Burmese grape seeds (BGSs). The seeds were collected from a local market, washed, pre-teated and finally converted into biochar by pyrolysis in a N2 furnace. The removal efficiency of the synthesized biochar was evaluated towards a cationic industrial azo dye, methylene blue (MB). The phosphoric acid (H3PO4) and potassium hydroxide (KOH) pretreated BGS were pyrolized at 500 °C for 3 h in a N2 furnace at a heating rate of 10 °C/min. The spectroscopic analysis confirmed the presence of multiple surface functional groups, e.g., R-OH, OH, -C=O, -COOH, etc. The surface of the biochar was randomized with porous tunnel-like structures. The specific surface area and pore volume obtained from BET analysis were 19.90 ± 1.20 m2/g and 5.85 cm3/g. The MB concentration (mg/L), contact duration (min) and pH were varied to assess the MB sorption phenomena. The optimum pH was found to be 8. During the first 20 min of contact time, adsorption was rapid and equilibrium was reached after 75 min. The adsorption was best described by pseudo-first-order kinetics with a good fit (R2 = 0.99). The maximum removal percentage was ~85%, and per gram of BGS can adsorb 166.30 mg of MB, which supports the Langmuir adsorption isotherm model. The obtained results were compared with the reported literature, and BGS showed its excellent candidacy to be industrially utilized in the tertiary stage of wastewater treatment plants.

Langmuir adsorption model

Potassium hydroxide

Methylene blue

10.3390/w15030394

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Citations (14)

Room temperature ferromagnetic behavior of manganese/manganese oxides nanocomposites

Materials Letters (2018)

A. K. M. Atique Ullah Aslam Hossain Mahmuda Akter M. F. Kabir M. N. I. Khan

Nanorod

10.1016/j.matlet.2018.12.003

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Citations (12)

The 10% Gd and Ti co-doped BiFeO3: A promising multiferroic material

Journal of Alloys and Compounds (2016)

M. A. Basith Areef Billah Md. Abdul Jalil Nilufar Yesmin Mashnoon Alam Sakib

Rietveld Refinement

10.1016/j.jallcom.2016.10.018

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Citations (78)

Boosting capacitive performance of manganese oxide nanorods by decorating with three-dimensional crushed graphene

Nano Convergence (2022)

Akter Hossain Reaz Shimul Saha Chanchal Kumar Roy Md A. Wahab Geoffrey Will

This work reports the rational design of MnO

Nanorod

10.1186/s40580-022-00300-2

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Citations (25)

Wrinkled Flower-Like rGO intercalated with Ni(OH)₂ and MnO₂ as High-Performing Supercapacitor Electrode

ACS Omega (2022)

Yeasin Arafat Tarek Ragib Shakil Akter Hossain Reaz Chanchal Kumar Roy Hasi Rani Barai

This study reports a simple one-step hydrothermal method for the preparation of a Ni(OH)2 and MnO2 intercalated rGO nanostructure as a potential supercapacitor electrode material. Having highly amorphous rGO layers with turbostratic and integrated wrinkled flower-like morphology, the as-prepared electrode material showed a high specific capacitance of 420 F g-1 and an energy density of 14.58 Wh kg-1 with 0.5 M Na2SO4 as the electrolyte in a symmetric two-electrode. With the successful intercalation of the γ-MnO2 and α-Ni(OH)2 in between the surface of the as-prepared rGO layers, the interlayer distance of the rGO nanosheets expanded to 0.87 nm. The synergistic effect of γ-MnO2, α-Ni(OH)2, and rGO exhibited the satisfying high cyclic stability with a capacitance retention of 82% even after 10 000 cycles. Thus, the as-prepared Ni(OH)2 and MnO2 intercalated rGO ternary hybrid is expected to contribute to the fabrication of a real-time high-performing supercapacitor device.

10.1021/acsomega.2c01986

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Citations (23)

One-Step Gel Formation Method for the Synthesis of NiO-MnXOY Mixed Oxide Nanomaterials as a Prospective Supercapacitor Material

Yeasin Arafat Tarek Akter Hossain Reaz Ragib Shakil Hridoy Roy Rumana A. Jahan

Composites of transition metal oxides are very well known for their excellent electrochemical performance. Herein, we have reported the preparation of a nano-architectured mixed metal oxide of NiO-Mn _X O _Y by using simple gel formation method towards high-performance electrochemical supercapacitor. The surface morphology of the mixed oxides was investigated by scanning electron microscope (SEM) and was found to be in nano-dimension with capsule shape. The X-ray diffraction (XRD) pattern demonstrated the highly crystalline structure of the mixed oxides. The quasi-rectangular CV curves of NiO-Mn _X O _Y in between (-0.4 to + 0.3 V) indicated almost ideal double-layer capacitive properties of the prepared material. However, the slightly distorted symmetrical triangular GCD confirmed the contribution of both electric double layer capacitance (EDLC), and pseudo capacitance over the total capacitance. The total specific capacitance of NiO-Mn _X O _Y was found to be 450 Fg ^-1 at a current density of 0.5 Ag ^-1 in 0.5 M Na ₂ SO ₄ aqueous electrolyte. A small half semicircle arcs at the high frequency region of Nyquist plot indicated the low charge transfer resistance of NiO-Mn _X O _Y oxide at the electrode and electrolyte interfaces which facilitated the large ionic charge storage capacity of the electrode material. The excellent capacitance performance of the as prepared material demonstrated the suitability of the material for the application in practical supercapacitors.

Non-blocking I/O

10.1109/sti50764.2020.9350497

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Citations (1)

Refractive Index Measurements of CaF2 Single Crystal and Melt by Ellipsometry

High Temperatures-High Pressures (2008)

Shakhawat H. Firoz Takashi Sakamaki 理恵遠藤匡裕須佐 Masahiro Susa

Refractive indices of CaF2 have been determined by ellipsometry and factors determining the temperature dependence have been discussed. Measurements were made on CaF2 single crystal and melt in dehydrated He atmosphere in the temperature ranges room temperature-1050 K and 1600-1800 K, respectively. The standard deviation in the measured refractive indices was within ± 0.001. The refractive indices obtained have been approximated to the following equations: Single crystal: n = n298 – 1.541×10(T – 298) 298 – 1050 K Melt: n = n1600 – 4.667×10 (T – 1600) 1600 – 1800 K where n298 = 1.429 and n1600 = 1.409. It is likely that the temperature coefficients are determined predominantly by those of the densities.

Ellipsometry

Crystal (programming language)

Source

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Citations (5)

Nanozyme-based electrochemical biosensors for disease biomarker detection

The Analyst (2020)

Rabbee G. Mahmudunnabi Fatema Zerin Farhana Navid Kashaninejad Shakhawat H. Firoz Yoon‐Bo Shim

In this review, we have summarised the synthesis and classification of common nanozymes and their applications in electrochemical biosensor development.

10.1039/d0an00558d

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Citations (166)

Fabrication of highly and poorly oxidized silver oxide/silver/tin(IV) oxide nanocomposites and their comparative anti-pathogenic properties towards hazardous food pathogens

Journal of Hazardous Materials (2020)

Md. Ikram Ul Hoque Al‐Nakib Chowdhury Tofazzal Islam Shakhawat H. Firoz Ummayhanni Luba

Oomycete

Tin oxide

Silver nanoparticle

10.1016/j.jhazmat.2020.124896

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Citations (15)

Role of Ionic Moieties in Hydrogel Networks to Remove Heavy Metal Ions from Water

ACS Omega (2020)

N. D. Chowdhury Solaiman Chanchal Kumar Roy Shakhawat H. Firoz Tahmina Foyez

A variety of methods for removing heavy metal ions from wastewater have been developed but because of their low efficiency, further production of toxic sludge or other waste materials, high expense, and lengthy procedures, limited progress has been achieved to date. Polymeric hydrogel has been attracting particular attention for the effective removal of heavy metal ions from wastewater. Here, ionogenic polymeric hydrogels were prepared by free-radical copolymerization of a neutral acrylamide (AAm) monomer with an ionic comonomer in the presence of a suitable initiator and a cross-linker. Different types of ionic comonomers such as strongly acidic: 2-acrylamido-2-methylpropane sulfonic acid, weakly acidic: acrylic acid (AAc), and zwitterionic: 2-methacryloyloxy ethyl dimethyl-3-sulfopropyl ammonium hydroxide with varying amounts were incorporated into the poly(AAm) networks to fabricate the hydrogels. The heavy metal ions (Fe3+, Cr3+, and Hg2+) removal capacity of the fabricated hydrogels from an aqueous solution via electrostatic interactions, coordination bond formation, and a diffusion process was compared and contrasted. The poly(AAm) hydrogel containing weakly acidic AAc groups shows excellent removal capacity of heavy metal ions. The release and recovery of heavy metal ions from the hydrogel samples are also impressive. The compressive strength of hydrogels was found to be significantly high after incorporating heavy metal ions that will increase their potential applications in different sectors.

Comonomer

Acrylic acid

Polyacrylic acid

10.1021/acsomega.0c05411

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Citations (21)