000			02942nam a22003137a 4500
003			OSt
005			20250717145528.0
008			250715b |||||||| |||| 00| 0 eng d
040			_aTUPM _bEnglish _cTUPM _dTUPM _erda
050			_aBTH RB 37 _bA68 2025
100			_aAquino, Errol B. _eauthor
245			_aBiosorption of cr(vi) from a queous solution using cao nanoparticles extracted from tahong (asian green mussels) waste shells/ _cErrol B. Aquino, Dana Kay J. Dagohoy, Jan Richellow D. Daladio, and Aliya Mae B. Viray.--
260			_aManila: _bTechnological University of the Philippines, _c2025.
300			_aix, 117pages: _c29cm.
336			_2rdacontent
337			_2rdamedia
338			_2rdacarrier
500			_aBachelor's thesis
502			_aCollege Of Science.-- _bBachelor of applied science in laboratory technology: _cTechnological University of the Philippines, _d2025.
504			_aIncludes bibliographic references and index.
520			_aThis 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.
650			_aBiosorption
650			_aCalcium oxide nanoparticles
650			_aTahong shells
700			_aDagohoy, Dana Kay J. _eauthor
700			_aDaladio, Jan Richellow D. _eauthor
700			_aViray, Aliya Mae B. _eauthor
942			_2lcc _cBTH COS _n0
999			_c30385 _d30385