Umi Fazara Md Ali
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Preferred name
Umi Fazara Md Ali
Official Name
Umi Fazara, Md Ali
Alternative Name
Ali, Umi Fazara Md
Md. Ali, Umi Fazara
Umi Fazara, M. A.
Main Affiliation
Scopus Author ID
57195513638
Researcher ID
AAU-4840-2020

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  • Publication
    Optimization of Nickel Precipitation and Leaching Process from Simulated Industrial Waste: A Study on pH, Contact Time, and Sulfuric Acid Concentration
    ( 2024-01-01)
    Zulkurnai N.Z.
    ;
    Umi Fazara Md Ali
    ;
    Naimah Ibrahim
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Nor Ashikin Ahmad
    ;
    Zuki F.M.
    The presence of nickel in industrial waste has emerged as a significant environmental concern, predominantly attributed to the plating industry. The significant objective of this study is to optimize the precipitation and leaching method to extract valuable nickel from the waste material. The high concentration of nickel found in the waste makes it a potentially valuable resource. To explore its potential extraction, the precipitation and leaching processes were optimized using a simulated Watts bath solution which is widely employed in the industry. This study focuses on examining the influence of pH, contact time, and sulfuric acid concentration on the extraction of nickel concentration during the precipitation and leaching processes. To develop a prediction model for the process, three models were taken into consideration: quadratic, linear, and 2F1. The quadratic model exhibited the greatest adjusted R2 value, suggesting a superior level of fit in comparison with the linear and 2F1 models. The predicted R2 value of 0.8169 exhibits a satisfactory level of concordance with the adjusted R2 value of 0.9737. The recommended optimal conditions proposed by response surface methodology (RSM) consisted of a pH value of 10.56, a contact time of 16.52 h, and a sulfuric acid concentration of 1.80 M in order to achieve a nickel concentration of 28,415 mg/L.
      1
  • Publication
    Impact of Power Supply on Electro-Precipitation of Nickel Hydroxide from Industrial Electronic Waste
    ( 2023-01-01)
    Huzairy Hassan
    ;
    Mismisuraya Meor Ahmad
    ;
    Hui G.X.
    ;
    Sabri M.S.A.M.
    ;
    Ismail M.
    ;
    Umi Fazara Md Ali
    Nickel is a silvery-white metal that is in high demand for a variety of commercial applications due to its ability to withstand high temperatures and corrosive environments. However, the widespread use of nickel compounds in many applications has resulted serious environmental pollutions if they are not properly treated before discharging. The electro-precipitation technique for depositing nickel from industrial waste has become one of the most favorable treatment methods because of its simplicity and low environmental requirements. In this study, the efficiency of nickel deposition from industrial electronic waste with relation to power supply variation (5A and 10A) was explored using various parameters such as electrode type and reaction time. The experiments were conducted in a 500 mL batch reactor with dual electrodes: aluminum (Al) as and stainless-steel (SS) as the anode and the cathode. The results show that the optimum condition of electro-precipitation process of nickel removal efficiency of 99.9% was obtained at 5 A, for 45 min. This research could pave the way for a low-power treatment of industrial nickel wastes.
      1  18
  • Publication
    Optimization of Nickel Electrowinning from Simulated Watts Bath of Electronics Industrial Waste
    ( 2023-01-01)
    Zulkurnai N.Z.
    ;
    Hua Y.M.
    ;
    Umi Fazara Md Ali
    ;
    Mohd Irfan Hatim Mohamed Dzahir
    ;
    Naimah Ibrahim
    ;
    Zuki F.M.
    Plating process now has been widely used in the electronics industries for corrosion resistance purpose. One of favorable solution used in nickel-plating process is Watts Bath solution. After several duration of time, the used Watts Bath must be discarded. Due to high amount of nickel concentration inside the Watts Bath, it has been considered as a schedule waste and need a proper disposal process which is expensive. One of reliable methods to dispose and recover nickel from the Watts Bath is by using electrowinning process. The aims of this study are to determine concentration of Watts Bath and to optimize the electrowinning process by using Box-Bhenken Design from Simulated Watts Bath of Electronics Industrial Waste. During this study, the electrolyte concentration, potential applied and contact time were optimized, and the surface morphology of nickel deposited also has been studied. From the result, the concentration of Watts Bath solution is 153 g/L and the removal of 75.04% was obtained under optimized condition which were 0.4 M of electrolyte concentration, 0.4 V of potential applied, and 60 min of contact time.
      1