纳米腐殖酸基离子交换复合树脂动态吸附-脱附冶金镍镉废水

发布时间：2018-10-05 21:26

【摘要】：系统研究了纳米腐殖酸基离子交换复合树脂在多离子共存体系中对Ni~(2+)/Cd~(2+)的选择吸附性能。以此为基础,通过多柱串联、饱和吸附、洗脱液套用方法完成了对Ni~(2+)、Cd~(2+)冶金废水资源化治理研究,用扫描电镜(SEM)、红外光谱仪(FTIR)、热重分析仪(TG-DTA)、X射线光电子能谱仪(XPS)及N2吸附-脱附分析仪(BET)等物理手段对复合树脂的微观形貌、化学结构、耐热性、元素组分变化及孔径分布进行表征。研究结果表明:纳米腐殖酸基复合树脂对Ni~(2+)、Cd~(2+)离子具有吸附速度快[0.55~1.50 mg·(g·min)-1]、交换容量高(Ca~(2+)、Mg~(2+)共存体系中对Ni~(2+)、Cd~(2+)吸附容量分别为139 mg·g~(-1)和148 mg·g-1)、选择性能好等优点,回收溶液中镍和镉离子浓度和纯度高(分别为45.15 g·L~(-1)和39.17g·L~(-1),且CNi(Ⅱ)/Ctotal=0.989,CCd(Ⅱ)/Ctotal=0.994);吸附-洗脱200次后,其物理、化学结构性能稳定;断面形貌变化不明显,交换容量基本不变,可重复使用;比表面积、平均孔径及孔容分别为1189.85 m2·g~(-1)、30.2 nm和0.96 cm3·g~(-1),热稳定性能好;氮含量从16%降至12%、氧含量由26.49%升至29.96%,交换容量由5.38mmol·g-1升至6.06 mmol·g-1。
[Abstract]:The selective adsorption properties of nano-humic acid-based ion-exchange composite resin for Ni~ (2) / CD ~ (2) were systematically studied in a multi-ion coexistence system. On the basis of this, the treatment of Ni~ (2) CD ~ (2) metallurgical wastewater was studied by means of multi-column series, saturated adsorption and eluent application. The microstructure, chemical structure and heat resistance of composite resin were studied by scanning electron microscope (SEM),) infrared spectrometer (SEM), (FTIR), thermogravimetric analyzer (TG-DTA), X-ray photoelectron spectroscopy (XPS) and N2 adsorption-desorption analyzer (BET). The change of element composition and pore size distribution were characterized. The results show that the nano-humic acid based composite resin has the advantages of fast adsorption rate [0.55 ~ 1.50 mg (g min) ~ (-1)], high exchange capacity (Ca~ (2) -Mg2) adsorption capacity of Ni~ (2) CD ~ (2) (139 mg g ~ (-1) and 148 mg g ~ (-1) for Ni~ (2) O ~ (2) CD ~ (2), and good selectivity. The concentration and purity of nickel and cadmium ions in the recovery solution were high (45.15 g / L ~ (-1) and 39.17 g / L ~ (-1), respectively, and CNi (鈪，

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