000			02045nam a2200277Ia 4500
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003			ft7893
005			20251013135915.0
008			240722n 000 0 eng d
040			_erda
041			_aengtag
050			_aQD1.M37 2024
082			_a.
100			_aYuan S. masuda, Jemeul M. De Guzman, Jovelyn E. Duave, Marie Adeana Therese S. Sy.
245		0	_aHeavy metal biosorption using Tripneustes gratilla (striped sea urchin ) test: equilibrium isotherm and kinetic studies.
264			_aManila: _bPLM, _cc2024
300			_bUndergraduate Thesis: (Bachelor of Science in Chemistry) - Pamantasan ngf Lungsod ng Maynila, 2024
336			_btext _atext _2text
337			_bunmediated _aunmediated _2unmediated
338			_bvolume _avolume _2volume
505			_aABSTRACT: An untreated biosorbent prepared from Tripneustes gratilla test was utilized as an eco-friendly alternative for the aqueous removal of Mn(II), Co(II), Ni(II), and Cu(II). Characterization revealed a moisture content of 5.064 (=0.096)%, a pH of 8.279 (=0.033) at 20.9 (=0.5) C, a conductivity of 59.6 (=0.5)uS cm-1 at 24.6 (=0.3) 0C, and aqueous solubility of 6.1 (=0.3) %. ATR-FTIR analysis confirmed the presence of amorphous CaCO3 and supported physisorption. SEM-EDS revealed non-porous particulates, primarily composed of O (53%), Ca (34%), C (11%), and Mg (2%). Optimization determined an optimal pH of 6 for Mn and 5 for Co, Ni, and Cu, and an optimal biosorbent dosage of 125 g L-1 for Cu. Kinetic studies favoured PSO kinetics for all metals. Equilibrium isotherm studies showed that the Freundlich isotherm suited Mn biosorption best, whereas the Langmuir isotherm modelled Co, Ni, and Cu better. From the Dibinin-Radushkevich isotherm, physisirptive mean free energy values were determined for all metals. T. gratilla test shows promising biosorptive potential in the removal of the selected divalent metals at the given conditions.
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655			_aacademic writing
942			_alcc _cMS _01 _2lcc
999			_c25449 _d25449