Ghimire Kedar Nath, Inoue Katsutoshi, Yamaguchi Hiroki, Makino Kenjiro, Miyajima Tohru
Faculty of Science & Engineering, Department of Applied Chemistry and Chemistry, Saga University, Honjo-machi 1, Saga 840-8502, Japan.
Water Res. 2003 Dec;37(20):4945-53. doi: 10.1016/j.watres.2003.08.029.
Cellulose and orange waste were chemically modified by means of phosphorylation. The chemically modified gels were further loaded with iron(III) in order to create a suitable chelating environment for arsenate and arsenite removal. The loading capacity for iron(III) on the gel prepared from orange waste (POW) was 1.21 mmol g(-1) compared with 0.96 mmol g(-1) for the gel prepared from cellulose (PC). Removal tests of arsenic with the iron(III)-loaded gel were carried out batchwise and by using a column. Arsenite removal was favored under alkaline condition for both PC and POW gels, however, the POW gel showed some removal capability even at neutral pH. On contrary, arsenate removal took place under acidic conditions at pH=2-3 and 2-6 for the PC and POW gels, respectively. Since iron(III) loading is higher on the POW gel than on the PC gel greater arsenic removal has been achieved by the POW gel compared with the PC gel. It can be concluded that the POW gel can be used for the removal and recovery of both arsenite and arsenate from arsenic contaminated wastewater.
纤维素和橙子皮废料通过磷酸化进行化学改性。对化学改性凝胶进一步负载铁（III），以便为去除砷酸盐和亚砷酸盐创造合适的螯合环境。由橙子皮废料制备的凝胶（POW）对铁（III）的负载量为1.21 mmol g⁻¹，而由纤维素制备的凝胶（PC）为0.96 mmol g⁻¹。用负载铁（III）的凝胶进行砷去除试验，采用分批法和柱法。对于PC和POW凝胶，在碱性条件下有利于亚砷酸盐的去除，然而，POW凝胶即使在中性pH值下也表现出一定的去除能力。相反，PC凝胶和POW凝胶分别在pH = 2 - 3和2 - 6的酸性条件下去除砷酸盐。由于POW凝胶上的铁（III）负载量高于PC凝胶，与PC凝胶相比，POW凝胶实现了更高的砷去除率。可以得出结论，POW凝胶可用于从受砷污染废水中去除和回收亚砷酸盐和砷酸盐。
