White bean (Phaseolus vulgaris L.) as a sorbent for the removal of zinc from rainwater.

摘要: Abstract The present work aimed to assess the sorption capacity of common white bean (Phaseolus vulgaris L.) remove Zn(II) from rainwater, rendering it suitable for use in buildings, and efficiency process was evaluated two initial concentrations, representing high (100 μg L-1) very (500 μg L−1) levels rainwater. effects amount beans (1, 5 10 per 50 mL), as well pH values zinc solution [acid (4), neutral (5.6) basic (7) atmospheric waters] were also assessed. removal Zn water affected by change values. When used, after 4 h 2 h contact time, respectively, accumulated on released back into solution, this release occurred first highest tested value. rate increased with increasing beans, but only took place up 2 h, respectively. Furthermore, percentages increase concentrations metal water. Kinetic studies revealed that a pseudo-first-order model provided best fitting experimentally obtained Fourier transform infrared spectroscopy coupled attenuated total reflectance (FTIR-ATR) analyses shells cores indicated did not cause notable alterations chemical structures these components. Scanning electron microscopy (SEM) energy dispersive X-ray (EDX) suggested at surface (shells). results study suggest matrix rainwater samples interfere metal, can be applied real samples. On whole, indicate 1 6 h, or used 50 mL 60% water, thus constituting viable effective reduction