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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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

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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.

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Durability properties of demineralized and torrefied Empty Fruit Bunch (EFB) pellets

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.

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Ammonium adsorption-desorption by using rice straw biochar

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.

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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.

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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.

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Effectiveness of banana pith as plant based coagulant for river water treatment

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.

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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.

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Coagulation-flocculation process for turbidity removal using alum sludge from water treatment plant

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.

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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.

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