Biosorption of cr(vi) from a queous solution using cao nanoparticles extracted from tahong (asian green mussels) waste shells/ Errol B. Aquino, Dana Kay J. Dagohoy, Jan Richellow D. Daladio, and Aliya Mae B. Viray.--

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Aquino, Errol B [author]

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TextPublication details: Manila: Technological University of the Philippines, 2025.Description: ix, 117pages: 29cmContent type:

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BTH RB 37 A68 2025

Dissertation note: College Of Science.-- Bachelor of applied science in laboratory technology: Technological University of the Philippines, 2025. Summary: This study investigated the potential of biosorption to remove hexavalent chromium [Cr(VI)] from aqueous solutions using calcium oxide (CaO) nanoparticles synthesized from Tahong (Asian green mussel) waste shells. CaO nanoparticles were synthesized via two methods: Sol-gel and Hydrothermal. Characterization using Fourier-Transform Infrared Spectroscopy (FTIR) confirmed successful decomposition of calcium carbonate to CaO, indicated by the disappearance of carbonate peaks and the appearance of a strong Ca–O stretching peak at ~554 cm−1. Scanning Electron Microscopy (SEM) revealed that Sol-gel CaO nanoparticles had an average particle size of approximately 99 nm with porous, aggregated structures ideal for adsorption. Energy-Dispersive X-ray Spectroscopy (EDX) showed that the synthesized nanoparticles contained 48.33% calcium and 44.67% oxygen by weight, with minor impurities of chlorine and sodium; post-adsorption analysis confirmed chromium uptake, with 1.09% Cr detected. The Sol-gel-derived CaO nanoparticles exhibited a finer morphology and higher adsorption efficiency, attributed to their increased surface area. Adsorption experiments examined the effects of various parameters, including adsorbent dosage, initial chromium concentration, pH, and temperature. Optimal removal efficiency (76.41%) was achieved at pH 5 and 30°C using Sol-gel CaO nanoparticles. Kinetic data fitted best with the pseudo-second-order model, while equilibrium studies followed the Freundlich isotherm, indicating multilayer adsorption. This study highlights the efficacy of Tahong-derived CaO nanoparticles as a sustainable, low-cost biosorbent for heavy metal remediation.

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Item type	Current library	Shelving location	Call number	Copy number	Status	Date due	Barcode
Bachelor's Thesis COS	TUP Manila Library	Thesis Section-2nd floor	BTH RB 37 S68 2025 (Browse shelf(Opens below))	c.1	Not for loan		BTH0006352

Bachelor's thesis

College Of Science.--
Bachelor of applied science in laboratory technology: Technological University of the Philippines,
2025.

Includes bibliographic references and index.

This study investigated the potential of biosorption to remove hexavalent chromium [Cr(VI)]
from aqueous solutions using calcium oxide (CaO) nanoparticles synthesized from Tahong
(Asian green mussel) waste shells. CaO nanoparticles were synthesized via two methods: Sol-gel
and Hydrothermal. Characterization using Fourier-Transform Infrared Spectroscopy (FTIR)
confirmed successful decomposition of calcium carbonate to CaO, indicated by the
disappearance of carbonate peaks and the appearance of a strong Ca–O stretching peak at ~554
cm−1. Scanning Electron Microscopy (SEM) revealed that Sol-gel CaO nanoparticles had an
average particle size of approximately 99 nm with porous, aggregated structures ideal for
adsorption. Energy-Dispersive X-ray Spectroscopy (EDX) showed that the synthesized
nanoparticles contained 48.33% calcium and 44.67% oxygen by weight, with minor impurities of
chlorine and sodium; post-adsorption analysis confirmed chromium uptake, with 1.09% Cr
detected. The Sol-gel-derived CaO nanoparticles exhibited a finer morphology and higher
adsorption efficiency, attributed to their increased surface area. Adsorption experiments
examined the effects of various parameters, including adsorbent dosage, initial chromium
concentration, pH, and temperature. Optimal removal efficiency (76.41%) was achieved at pH 5
and 30°C using Sol-gel CaO nanoparticles. Kinetic data fitted best with the pseudo-second-order
model, while equilibrium studies followed the Freundlich isotherm, indicating multilayer
adsorption. This study highlights the efficacy of Tahong-derived CaO nanoparticles as a
sustainable, low-cost biosorbent for heavy metal remediation.

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