Fredeve John Pacatang | University of the Philippines Visayas (original) (raw)

Papers by Fredeve John Pacatang

Philippine Science Letters, 2020

Annually, large volumes of synthetic textile dyes are released in effluent into natural streams c... more Annually, large volumes of synthetic textile dyes are released in effluent into natural streams causing damage to human health and environment. Conventional methods have been proven inefficient due to the stability of these dyes. An alternative emerging approach is the use of nanocatalysts in photocatalytic dye degradation. In this study, the ability of citrate-stabilized silver nanoparticles (cit-AgNP) to degrade methylene blue (MB) dye was investigated. Cit-AgNP was successfully synthesized using chemical reduction method and stabilized by sodium citrate. The resulting solution was yellow in color with absorbance peak at 393 nm. The particles were spherical in shape with average diameter of 9.19 ± 4.91 nm. In the degradation study, the photocatalytic degradation of MB is visually manifested by its reduction in color when exposed to light and the eventual reduction in absorbance at peak 663 nm. The percent degradation was quantified by calculating the amount of MB that remained in the solution and showed 94.45% after 10 minutes of exposure to light. Four different setups were also compared and analyzed based on color changes, absorbance curve profiles, and percent degradation to prove the catalytic activity of cit-AgNP and it was found out that the highest and fastest degradation was the setup with MB, NaBH4, and cit-AgNP. River water samples were also utilized to evaluate the effectivity of degradation in real water applications. It has showed no significant difference compared to the setup prepared with distilled water after statistical tests. Hence, this study showed the potential of cit-AgNP for dye degradation.

Pacatang, Fredeve John P., Macasio, Danielle Faye Z., Sarong, Donna Richel B. 2013.Milkfish (Chan... more Pacatang, Fredeve John P., Macasio, Danielle Faye Z., Sarong, Donna Richel B. 2013.Milkfish (Chanos chanos) Scales as an Alternative Chick Booster. Kidapawan City National High School, Kidapawan City.

The study entitled “Milkfish (Chanos chanos) Scalesas an Alternative Chick Booster” aimed to test the ability of Milkfish scalesin making Chick Booster. Specifically, it attains the following: (1) to distinguish the treatments obtained from the Milkfish scalesin making chick booster; (2) to determine which treatment is most preferred by the subjects; (3) to find out if there is a significant difference among the treatments and replications in terms of the weight of the chicks; (4) to find out if it is cost effective compared to the commercial one.
In making the chick booster, the Milkfish scales were collected. Afterwards, it was washed thoroughly in plenty of water, strained through a sieve during the rinsing, sun dried then roasted. The prepared scales were then grinded and mixed to obtain the product.
The study was laid out using Randomized Complete Block Design (RCBD) with four (4) treatments and three (3) replications to evaluate the feasibility of Milkfish scales as an alternative chick booster. Two-way Analysis of Variance (ANOVA) was used to determine the difference of each treatment and replications in terms of growth rate of the subjects. There were 24 randomly selected subjects which were tested with the product.
The result showed that the first treatment with 100 grams of pure fish scales is the most preferred among the experimental group in terms of weight of the chicks with a mean of 5.74. Thus, the use of Milkfish scales as an alternative Chick Booster is feasible.

Philippine Science Letters, 2020

Annually, large volumes of synthetic textile dyes are released in effluent into natural streams c... more Annually, large volumes of synthetic textile dyes are released in effluent into natural streams causing damage to human health and environment. Conventional methods have been proven inefficient due to the stability of these dyes. An alternative emerging approach is the use of nanocatalysts in photocatalytic dye degradation. In this study, the ability of citrate-stabilized silver nanoparticles (cit-AgNP) to degrade methylene blue (MB) dye was investigated. Cit-AgNP was successfully synthesized using chemical reduction method and stabilized by sodium citrate. The resulting solution was yellow in color with absorbance peak at 393 nm. The particles were spherical in shape with average diameter of 9.19 ± 4.91 nm. In the degradation study, the photocatalytic degradation of MB is visually manifested by its reduction in color when exposed to light and the eventual reduction in absorbance at peak 663 nm. The percent degradation was quantified by calculating the amount of MB that remained in the solution and showed 94.45% after 10 minutes of exposure to light. Four different setups were also compared and analyzed based on color changes, absorbance curve profiles, and percent degradation to prove the catalytic activity of cit-AgNP and it was found out that the highest and fastest degradation was the setup with MB, NaBH4, and cit-AgNP. River water samples were also utilized to evaluate the effectivity of degradation in real water applications. It has showed no significant difference compared to the setup prepared with distilled water after statistical tests. Hence, this study showed the potential of cit-AgNP for dye degradation.

Pacatang, Fredeve John P., Macasio, Danielle Faye Z., Sarong, Donna Richel B. 2013.Milkfish (Chan... more Pacatang, Fredeve John P., Macasio, Danielle Faye Z., Sarong, Donna Richel B. 2013.Milkfish (Chanos chanos) Scales as an Alternative Chick Booster. Kidapawan City National High School, Kidapawan City.

The study entitled “Milkfish (Chanos chanos) Scalesas an Alternative Chick Booster” aimed to test the ability of Milkfish scalesin making Chick Booster. Specifically, it attains the following: (1) to distinguish the treatments obtained from the Milkfish scalesin making chick booster; (2) to determine which treatment is most preferred by the subjects; (3) to find out if there is a significant difference among the treatments and replications in terms of the weight of the chicks; (4) to find out if it is cost effective compared to the commercial one.
In making the chick booster, the Milkfish scales were collected. Afterwards, it was washed thoroughly in plenty of water, strained through a sieve during the rinsing, sun dried then roasted. The prepared scales were then grinded and mixed to obtain the product.
The study was laid out using Randomized Complete Block Design (RCBD) with four (4) treatments and three (3) replications to evaluate the feasibility of Milkfish scales as an alternative chick booster. Two-way Analysis of Variance (ANOVA) was used to determine the difference of each treatment and replications in terms of growth rate of the subjects. There were 24 randomly selected subjects which were tested with the product.
The result showed that the first treatment with 100 grams of pure fish scales is the most preferred among the experimental group in terms of weight of the chicks with a mean of 5.74. Thus, the use of Milkfish scales as an alternative Chick Booster is feasible.