Khairunissa Syairah Ahmad Sohaimi
Thumbnail Image
Preferred name
Khairunissa Syairah Ahmad Sohaimi
Official Name
Ahmad Sohaimi, Khairunissa Syairah
Alternative Name
Ahmad Sohaimi, Khairunissa Syairah
Ahmad Sohaimi, K. S
Main Affiliation
Scopus Author ID
57200989580
Researcher ID
GBL-8741-2022

Research Output

Filters

1
13
Reset filters

Settings
Now showing 1 - 10 of 13
  • Publication
    Synthesis and Characterisation of Dual Z-Scheme V2O5/g-C3N4 Photocatalysts for Degrading Ciprofloxacin Antibiotics Under Visible Light
    ( 2024)
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Juhana Jaafar
    ;
    Hadi Nugraha Cipta Dharma
    ;
    Ojo Samuel
    ;
    A. F. Ismail
    ;
    M. H. D. Othman
    ;
    Mukhlis A. Rahman
    ;
    F. Aziz
    ;
    W. N. W. Salleh
  • Publication
    Ammonium adsorption - Desorption using rice husk biochar
    ( 2021-05-24)
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Nur Izzati Iberahim
    ;
    Ghani A.A.
    ;
    Zafifah Zamrud
    ;
    Heng C.W.
    Rice husk was utilized into biochar by pyrolysis and used as adsorbent for ammonium removal. Rice husk biochar (RHB) was produced at temperature of 3500C, 4000C, 4500C, 5000C, and 5500C. Characteristics of biochar were analyzed by moisture content, ash content, pH Zero Charge and Fourier Transform Infrared (FTIR) Spectroscopy. As the temperature for the pyrolysis increases, the moisture content of RHB decreases while the ash content of RHB increases. From the pH zero charge analysis, the value obtained from analysis is pH 7. The FTIR spectra showed the organic part of RHB with different functional groups such as alkene, alcohol, phenol, ether, ester etc. Based on the result of the characterization test, RHB500 was chosen as the best biochar for the adsorption of ammonium. The equilibrium contact time was 180 minutes and the optimum adsorbent dosage was 0.1g and the optimum concentration of ammonium was 1.2 ppm. For the adsorption-desorption of ammonium, RHB can run up to 5 cycles for biochar regeneration. Adsorption kinetic, pseudo-second-order model is more preferable than pseudo-first-order model because R2 value is 0.9995 which closer to 1.
  • Publication
    Coagulation-flocculation process for turbidity removal using alum sludge from water treatment plant
    (AIP Publishing, 2023)
    J. H. Chan
    ;
    Nor Aida Yusoff
    ;
    Noor Ainee Zainol
    ;
    Nor Munirah Rohaizad
    ;
    Khairunissa Syairah Ahmad Sohaimi
    The aim of this research was to utilize alum sludge, also known as water treatment residual (WTR) from water treatment plant for preparing sludge reagent product (SRP) as coagulant in removing turbidity of kaolin suspension and river water. The WTR was characterized by examine the inorganic component (functional group, and surface morphology using X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM) respectively. WTR had an amorphous structure and contained high aluminum metal constituents with 35.4 %, which can be recovered as coagulant. Acidification was conducted to recover these aluminium in WTR by using sulphuric acid and produced SRP. The optimum condition of SRP prepared from WTR was evaluated through parameters such as sludge concentration, normality and dosage of acid. It has been observed that 1 % sludge concentration acidified with 0.08 ml/ml sludge and 2.0 N H2SO4 of SRP gave the maximum percentage turbidity removal of 99.46 %. The performance of SRP in coagulation-flocculation process by using a standard jar test was studied based on the effect of pH, kaolin concentration, and SRP dosage. The highest percentage turbidity removal (99.79 %) was obtained at pH 7, kaolin concentration of 800 mg/L, and SRP dosage of 80 mg/L. The SRP performance was also compared to alum coagulant. The percentage turbidity removal of river water for both coagulants were almost similar, with 90.60 % for SRP and 91.18 % for alum respectively. Thus, SRP has the potential to replace commercial coagulant in water treatment plant in terms of costing and sustainability.
  • Publication
    Durability properties of demineralized and torrefied Empty Fruit Bunch (EFB) pellets
    (IOP Publishing, 2020)
    Alina Rahayu Mohamed
    ;
    Ras Izzati Ismail
    ;
    Rashid, Mohammad Abdur
    ;
    Khairunissa Syairah Ahmad Sohaimi
    ;
    N N Kasim
    ;
    R Badlishah Ahmad
    The pelletization of raw and demineralized and torrefied empty fruit bunch (TDEFB) were conducted upon mixing with bio-oil that was obtained from EFB pyrolysis. The ratio of bio-oil addition to raw and TDEFB was varied from 0-20 wt%. Then it was pressed using the single pellet press machine. The effects of the ratio of bio-oil addition to raw and TDEFB and the thickness of pellets were evaluated towards its durability. It was identified that the ratio of bio-oil addition to raw and TDEFB pellet of 5 wt% had produced the optimum durability which was 69.27 and 74.46 % respectively. In terms of the thickness of the raw and torrefied pellets, it was determined that at thickness of 3 cm, the durability was the highest which were 70.12 and 71.12 % for both raw and TDEFB pellets respectively. The raw and TDEFB pellets were analysed using Fourier Transform Infra-Red (FTIR) spectroscopy in order to evaluate the presence of functional groups within the materials. The presence of O-H hydroxyl group, C=O from carbonyl or ester and C-H alkane groups are detected in both raw and torrefied pellets.
  • Publication
    Synthesis, properties, and applications of Vanadium Pentoxide (Vâ‚‚Oâ‚…) as photocatalyst: a review
    (Penerbit UTM Press, 2023)
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Juhana Jaafar
    ;
    Norafiqah Rosman
    Water pollution has increased worldwide, sparking interest in photocatalysis, a viable water treatment approach. Vanadium pentoxide (V2O5) is a good photocatalyst for photocatalytic degradation due to its excellent crystallinity, high yield and recyclability, low cost, photo-corrosion resistance, small band gap (2.3 eV), improved electron mobility, and broad absorption range. Pure V2O5‘s photocatalytic efficiency is limited by inefficient photonic and quantum processes, and its tiny structure enables photogenerated carriers to recombine, reducing efficiency. This prevents widespread use of V2O5. This mini-review examines V2O5 as a potent visible-light photocatalyst, focusing on its structure, synthesis methods, and modifications that improve its efficiency. Hydrothermal, sol-gel, co-precipitation, solvothermal, and others are reviewed. The methods employed affect the photocatalyst’s efficiency. Photogenerated electron-hole separation, charge transfer to catalyst surface or across two-phase catalyst interfaces, and reactive species interaction with hazardous contaminants are all affected. Photoredox uses have been explored for dyes, phenols, and pharmaceutical wastes. According to a review of the past decades, V2O5 has primarily been used for the degradation of dye pollutants, with fewer applications for pharmaceutical wastes and other pollutants. More research on V2O5‘s capabilities and qualities on diverse target pollutants is needed. This mini-review discusses present obstacles in producing vanadium pentoxide-based systems and future research prospects. Despite its potential as a photocatalyst, V2O5 has not been thoroughly researched as an electron storage material. Numerous investigations have shown that V2O5 can store energy like lithium batteries. This finding will likely motivate researchers and newcomers to explore V2O5‘s potential to synthesise nanomaterials with increased electron storage capacity, making it a good day-night photocatalyst. This review should improve future V2O5 research.
  • Publication
    Effectiveness of banana pith as plant based coagulant for river water treatment
    (AIP Publishing, 2023)
    Noor Ainee Zainol
    ;
    Tan Li Ting
    ;
    Nor Aida Yusoff
    ;
    Nor Munirah Rohaizad
    ;
    Khairunissa Syairah Ahmad Sohaimi
    River water pollution is one of the remarkable global issues that cause water crisis worldwide. Coagulation-flocculation treatment is extensively applicable for treating river water. Nonetheless, many developing countries still paying high cost for importing chemical-based coagulant as water treatment agent which is non-environmentally friendly and possess potential hazard to human health. Thus, in this research, banana pith was selected as natural coagulant as alternative material for existing chemical coagulant in river water treatment. Optimum dosage and pH of banana pith in river water treatment was examined through a series of Jar Test experiment. A comparative study on river water treatment from two different sampling sites using banana pith was evaluated in term of the percentage of turbidity and COD removal. The results indicated that the banana pith was able to effectively remove 73.53% and 92.72% of COD and turbidity respectively for Station 2 (Esplanade Pengkalan Asam) at optimum pH of 4 with desired dosage of 6 mg/L. On the contrary, banana pith eliminated 56.03% of COD and 82.80% of turbidity for river water from Station 1(Bukit Lagi) at optimum pH of 4 and dosage of 10 mg/L. Obviously, banana pith can perform well in removing turbidity and COD river water (Station 2) as compared to Station 1 for both parameters. Overall, the finding indicated that the banana pith has a potential and promising alternative natural coagulant in future for replacing commercial coagulant used in river water treatment.
      3  14
  • Publication
    Compost Physical Properties Study on Degradation of Poultry Manure Composting in Closed-Aerated Composter
    ( 2020-12-18)
    Siti Nazrah Zailani
    ;
    Lee C.T.
    ;
    Noor Ainee Zainol
    ;
    Yusoff N.A.
    ;
    Khairunissa Syairah Ahmad Sohaimi
    A variety of parameters including physical, chemical, and biological properties of different input materials contribute to different composting performance. This study aimed to investigate the compost physical properties (bulk density, porosity, specific surface area and water holding capacity) on the composting process at different initial moisture content (MC). The degradation of total organic carbon (TOC) for the compost inoculated with Bacillus coagulans (BC) and effective microorganism (EM) was determined. The composting materials consisted of 50 % sawdust, 12 % chicken dung and 38 % rice husk with a fixed initial C/N ratio of 30. A closed-aerated composter was fabricated with an optimum air flow rate of 0.3 L/min.kg compost to avoid O2 limitation for 7 d of composting. The compost temperature was recorded to exhibit the active reaction between microorganisms and compost materials will generate a considerable amount of heat. The effect of the initial MC of the compost bed has been intensively investigated with regards to compaction analysis and compost particle for the composting inoculated with BC or EM in an aerated closed-system composter. The results showed that composting using the single strain of BC provides comparable results to that degraded by the commercial mixed culture EM.
      9  38
  • Publication
    Effect of carbonized coconut shell as a filler on tensile properties and water absorptivity of HDPE composite
    (AIP Publishing, 2023)
    Loh Shao Tee
    ;
    Nor Munirah Rohaizad
    ;
    Nor Aida Yusoff
    ;
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Noor Ainee Zainol
    Generation of agricultural wastes have detrimental effect to our surrounding especially visual impacts and inefficient land use. Some of these wastes are natural fibers which can be used as potential filler in composite materials. In this study, carbonized coconut shell (CCS) had been utilized as filler and it was incorporated in the high density polyethylene (HDPE) matrix to develop carbonized coconut shell filled HDPE composites. Firstly, the coconut shell powder was treated by sodium hydroxide (NaOH) with the concentration of 1, 3, 5 and 7 wt% for 2 hours. The 7 wt% treated coconut shell revealed better filler properties in the proximate analysis. Next, it was converted into carbonized coconut shell via carbonization process at 600 °C and used as filler in HDPE composites. The carbonized coconut shell filled HDPE composites with different filler loading of 5 to 20 wt% were prepared using extruder at operating conditions of 180 °C at 70 rpm of screw speed. The increase in the filler loading enhanced the tensile strength and the Young’s modulus of the filled HDPE composite. However, the elongation at break of the composite was observed to decrease with an increasing in the filler loading. There are some voids observed in the HDPE/CCS5 composites while good surface adhesion was presented in HDPE/CCS15 composites. The water uptake by the composites was observed to be increased with the filler loading. In conclusion, the optimum filler loading for carbonized coconut shell filled HDPE composites was determined as 15 wt% because it imparts high tensile strength with moderate water absorption properties.
      16  2
  • Publication
    Cactus opuntia as coagulant in treating landfill leachate via coagulation process
    ( 2021-02-23)
    Zainol N.A.
    ;
    Syarmimi F.N.
    ;
    Siti Nazrah Zailani
    ;
    Yusoff N.A.
    ;
    Ghani A.A.
    ;
    Khairunissa Syairah Ahmad Sohaimi
    Coagulation-flocculation treatment is often used for the treatment of stabilized landfill leachate. However, uses a non-environmentally friendly chemical coagulant which is a threat to environment quality, therefore Cactus opuntia is proposed to replace the use of current chemical coagulants such as aluminium sulphate in order to achieve sustainable growth. In this regard, the comparative suitability of Cactus opuntia and alum as coagulants for the treatment of the stabilised leachate of the Padang Siding Landfill Site was evaluated via a series of Jar Test experimental works with a rapid mixing speed of 100 rpm for 3 minutes, a slow mixing speed of 30 rpm for 10 minutes and a set-up period of 30 minutes. In addition, the sludge volume index (SVI) of the treated leachate sample was calculated under optimised conditions. Cactus opuntia was able to remove 66.8 per cent turbidity and 42 per cent COD at optimal pH 2 with a favourable dose of 8000 mg / L, while the optimal pH 5 with a coagulant dose of 8000 mg / L induced 94.5 per cent turbidity and 69 per cent COD reduction from the same leachate sample. In addition, the SVI of alum coagulant was 42.2 while the Cactus opuntia was 4.45 with a relative ratio of alum to opuntia of 9:1. Cactus opuntia may also be proposed as a plentiful coagulant of metal cationic ions such as aluminium, iron and silica elements for the treatment of leachate.
      20  2
  • Publication
    Kinetics Analysis on Catalytic Pyrolysis of Empty Fruit Bunch (EFB) with Copper Oxide Doped Aluminium Oxide (CuO/Al2O3) Catalyst
    ( 2020-12-18)
    Alina Rahayu Mohamed
    ;
    Zin A.M.
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Izhar N.I.I.N.
    This study focuses on dynamic non-catalytic and catalytic pyrolysis of empty fruit bunch (EFB) with copper oxide doped aluminium oxide (CuO/Al2O3) at linear ramp rates of 10, 15, 20, 25, 30 and 40 Cmin-1 at pyrolysis temperature of 28-1000 C in a thermogravimetric analyzer (TGA). The thermogravimetric profiles for the thermochemical breakdown of EFB under non-catalytic and catalytic pyrolysis with CuO/Al2O3 comprise of three different levels. The kinetics analysis for the reactions were evaluated using the Kissinger and Ozawa methods. The values of activation energy (Ea) for non-catalytic EFB pyrolysis were 167.95 and 177.68 kJmol-1 based on Kissinger and Ozawa methods respectively. For catalytic pyrolysis with approximately 9.09 wt% CuO/Al2O3 catalyst, the values of Ea reduced to 127.72 and 137.42 kJmol-1 by Kissinger and Ozawa methods respectively. These values indicate that the presence of 9.09 wt% CuO/Al2O3 catalyst has successfully reduced Ea value for the EFB pyrolysis reaction.
      29  6