Abstract:
The alginate bead (Algi) can be mixed with hexagonal mesoporous silicate (HMS) or amino functionalized HMS (A-HMS) in order to pelletize HMS bead (Algi-HMS) and A-HMS bead (Algi-A-HMS), respectively. From obtained data, it was found that all adsorbents (Algi, Algi-HMS and Algi-A-HMS) can adsorb copper (Cu) by electrostatic interaction with carboxyl group. TX-100® (TX100) can be adsorbed via hydrogen bonding with silanol group of Algi-HMS and electrostatic force via amino group on Algi-A-HMS. All adsorption kinetic followed pseudo 2nd order kinetic. Adsorption isotherms of TX-100 on Algi-HMS were fitted well with Langmuir isotherm. While, adsorption isotherms of AB45 and Cu on Algi-A-HMS and Cu on Algi-HMS can be fitted well with all isotherm equation except linear isotherm. And adsorption isotherms of Cu on Algi had high correlation with all isotherm equation except Freundlich and linear isotherm. For column adsorption experiments, increasing of column length can decrease adsorbent usage rate which represented better efficiency. The depth of adsorbent bed and breakthrough time had linear relation base on Bohart-adams equation. The column sequencing using Algi, Algi-HMS and Algi-A-HMS had high selectivity efficiency for removing Cu, TX100 and AB45 from mixed solution respectively. Algi saturated with Cu can be regenerated by using nitric acid, however, Cu adsorption capacity of reused Algi was a little bit decreased. Regeneration of Algi-HMS and Algi-A-HMS by using water-ethanol regenerant might have destroyed the adsorbent structure.