Khairunissa Syairah Ahmad Sohaimi
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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

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  • 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
    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.
  • Publication
    Kinetic and isotherm studies of empty fruit bunch biochar on ammonium adsorption
    ( 2021-02-23)
    Razi Ahmad
    ;
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Mohamed A.R.
    ;
    Siti Nazrah Zailani
    ;
    Salleh N.H.M.
    ;
    Azizan N.H.
    The presence of excessive ammonium in wastewater due to agriculture and other industrial activities affects the aquatic plants, animals and human health. Common wastewater practice offers high cost and maintenance as well as low performance. The adsorption technique offers an efficient, economically favourable and reliable physicochemical treatment method. Despite the efficiency, the studies on Empty Fruit Bunch (EFB) biochar as an adsorbent for ammonium removal is under discovered. The conducted study described the characterization of EFB biochar together with its kinetic and isotherm studies for ammonium removal. EFB underwent conventional pretreatment using fixed bed reactor at temperature of 350, 450,550 and 650 °C for 60 min of holding time prior for characterization and kinetic studies. For characterization studies, moisture, ash and pH anlysis were performed before proceed with adsorption and kinetic studies. It was found that the increment of temperature resulted in high content of ash and low content of moisture while optimum pH was in the range of pH 7. The optimum condition for ammonium adsorption was 2.5 ppm of EFB, 0.05g of ammonia dosage and time exposure of 200 minutes. The ammonium adsorption followed the pseudo-second-order kinetic model which suggests that the ammonium adsorption process is controlled by the chemical adsorption mechanism. The finding suggests the utilization of EFB biochar as a good alternative for ammonium removal through adsorption process while increasing the biomass value.
  • Publication
    Surface Water Treatment with Natural Starches as Coagulant via Coagulation Process
    ( 2020-12-18)
    Noor Ainee Zainol
    ;
    Bakar S.N.S.
    ;
    Siti Nazrah Zailani
    ;
    Azlinda Abdul Ghani
    ;
    Khairunissa Syairah Ahmad Sohaimi
    In this study, natural polymers in the forms of starch from sago and tapioca were used as coagulant. The removal of turbidity and chemical oxygen demand (COD) using coagulation process from river water was examined. The treatment on the river water sample was evaluated via a series of Jar Test experimental works with rapid mixing speed of 120 rpm for 1 minute, slow mixing speed of 30 rpm for 20 minutes and settling time of 60 minutes. The tapioca starch removed 93.7% of turbidity at dosage of 1000 mg/L. While, sago starch successfully removed 96.4% of turbidity under optimum dosage of 2000 mg/L. pH 12 was optimum pH for turbidity removal by using sago and tapioca starch whereas the highest percentage of COD removal occurred at pH 4 using sago and tapioca starch. At pH 4, tapioca and sago starch removed 22.5% and 25% of COD respectively. Overall tapioca starch showed better removal percentage of turbidity compared to sago starch throughout the experiment study. Generally, the usage of natural polymers as coagulants is good for turbidity removal; however, it did not work well on COD removal.
  • 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.
  • 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
    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.
  • Publication
    Ammonium adsorption-desorption by using rice straw biochar
    (AIP Publishing, 2023)
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Norhidayah Abd Aziz
    ;
    Nor Aida Yusoff
    ;
    Noor Ainee Zainol
    ;
    Nor Munirah Rohaizad
    ;
    Siti Shilatul Najwa Sharuddin
    Rice straw was utilized into biochar by pyrolysis and used as adsorbent for ammonium removal. Rice straw biochar was found as one of the adsorbents for wastewater treatment. This study was conducted to analyses the capability of rice straw biochar on ammonium adsorption-desorption. Rice straw biochar was characterized by ash content, moisture content analysis, Fourier Transform Infrared (FTIR) analysis and pH of Zero Point Charge. Ash content increased meanwhile moisture content decreased as pyrolysis temperature increased. pH of Zero Point Charge for rice straw biochar was at pH 7.5. The rice straw produced at 550 °C was selected as best adsorbent for the adsorption of ammonium. The effect of process parameters such as adsorbent dosage, adsorption contact time, initial concentration and pH of ammonium were studied on the performance of ammonium adsorption. The results showed that maximum ammonium adsorption capacity was occurred at pH 7.5 by using 0.05 g of rice straw biochar in 3.0 ppm of ammonium solution for 130 minutes of contact time. Kinetic adsorption showed pseudo-second order is the best kinetic adsorption because involving a chemical adsorption as the value of R2 which was 0.9163 closer to 1. The adsorption-desorption of ammonium shown that rice straw biochar can run up to 5 cycles.
  • 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.
  • 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.