Departamento de Química, Universidade Federal de Lavras, P.O. Box 3037, Lavras, Minas Gerais 37200-000, Brazil.
Bioresour Technol. 2010 Jun;101(12):4639-45. doi: 10.1016/j.biortech.2010.01.103. Epub 2010 Feb 21.
The piassava fiber, residue of the broom industry, was used as precursor for the preparation of activated carbons (AC). AC were prepared by chemical activation with zinc chloride (AC ZnCl(2)) or phosphoric acid (AC H(3)PO(4)) and by physical activation with carbon dioxide (AC CO(2)) or water vapor (AC H(2)O). These materials were characterized by adsorption/desorption of N(2) to determine the BET areas, elemental analysis (CHN), thermogravimetric analysis (TG, DTA) and scanning electron microscopy (SEM). The carbons were tested with respect to their adsorption capacity of methylene blue, reactive red, phenol and metallic ions (Cr(+6), Cu(+2) and Zn(+2)). AC ZnCl(2) presented the highest surface area (1190 m(2)g(-1)) and AC H(3)PO(4), the largest pore volume (0.543 cm(3)g(-1)). AC ZnCl(2) was more efficient in the adsorption of methylene blue, Cr(+6) and Cu(+2) ions. AC H(2)O was the better adsorbent for phenol, while AC CO(2) was better for Zn(+2) ions.
剑麻纤维是扫帚工业的残留物，可用作制备活性炭（AC）的前体。通过用氯化锌（AC ZnCl(2)）或磷酸（AC H(3)PO(4)）进行化学活化，以及用二氧化碳（AC CO(2)）或水蒸气（AC H(2)O）进行物理活化来制备 AC。通过氮气吸附/解吸来测定比表面积、元素分析（CHN）、热重分析（TG、DTA）和扫描电子显微镜（SEM）对这些材料进行了表征。研究了这些碳对亚甲基蓝、活性红、苯酚和金属离子（Cr(+6)、Cu(+2)和 Zn(+2)）的吸附能力。AC ZnCl(2)具有最高的比表面积（1190 m(2)g(-1))和最大的孔体积（0.543 cm(3)g(-1))，AC H(3)PO(4)对亚甲基蓝、Cr(+6)和 Cu(+2)离子的吸附效率更高。AC H(2)O 是苯酚的更好吸附剂，而 AC CO(2) 则更适合 Zn(+2)离子。
