首页> 外文期刊>Journal of Applied Polymer Science >A novel fiber-coated strong base-type anion exchanger with superfast kinetics. Removal and recovery of silver thiosulfate from aqueous solutions
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A novel fiber-coated strong base-type anion exchanger with superfast kinetics. Removal and recovery of silver thiosulfate from aqueous solutions

机译:具有超快动力学的新型纤维涂层强碱型阴离子交换剂。从水溶液中去除和回收硫代硫酸银

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摘要

A commercial acrylic fiber with 92% (w/w) acrylonitrile content was partially hydrolyzed converting a fraction of the nitrile (-CN) groups to carboxylic acid (-COOH) groups, to coat the fiber with polyethylenimine (PEI) resin, which was then crosslinked with glutaraldehyde and further quaternized with ethyl chloroacetate to produce a novel strong-base anionic exchanger in the form of fiber. Designated as PAN(QPEI.XG)(Cl-), the fibrous sorbent was compared with a commercial bead-form resin Amberlite IRA-458(Cl-) in respect of sorption capacity, selectivity, and kinetics for removal of silver thiosulfate complexes from aqueous solutions. Though the saturation level of [Ag(S2O3)(2)](3-) on PAN(QPEI.XG)(Cl-) is considerably less than that on IRA-458(Cl-), the gel-coated fibrous sorbent exhibits, as compared to the bead-form sorbent, a significantly higher sorption selectivity for the silver thiosulfate complex in the presence of excess of other anions Such as S2O32-, SO42-, and Cl-, and a remarkably faster rate of both sorption and stripping. The initial uptake of the sorbate by the fibrous sorbent is nearly instantaneous, reaching up to similar to 80% of the saturation capacity within 10 s, as compared to only similar to 12% on the bead-form sorbent. The high initial rate of uptake fits a shell-core kinetic model for sorption on fiber of cylindrical geometry. With 4M HCl, the stripping of the sorbed silver complex from the fibrous sorbent is clean and nearly instantaneous, while, in contrast, a much slower rate of stripping on the bead-form sorbent leads to its fouling due to a slow decomposition of the silver thiosulfate complex in the acidic medium. (c) 2006 Wiley Periodicals, Inc.
机译:将具有92%(w / w)丙烯腈含量的商业丙烯酸纤维部分水解,将一部分腈(-CN)基团转化为羧酸(-COOH)基团,以用聚乙烯亚胺(PEI)树脂包覆该纤维,然后用戊二醛交联,再用氯乙酸乙酯季铵化,以生成纤维形式的新型强碱阴离子交换剂。将其命名为PAN(QPEI.XG)(Cl-),将其与商用珠状树脂Amberlite IRA-458(Cl-)进行了吸附能力,选择性和动力学的比较,以从中去除硫代硫酸银络合物水溶液。尽管PAN(QPEI.XG)(Cl-)上[Ag(S2O3)(2)](3-)的饱和度大大低于IRA-458(Cl-)的饱和度,但凝胶涂层的纤维状吸附剂表现出与珠状吸附剂相比,在过量存在其他阴离子(例如S2O32-,SO42-和Cl-)的情况下,硫代硫酸银络合物的吸附选择性显着提高,并且吸附和汽提速率均显着提高。纤维状吸附剂对山梨酸酯的初始吸收几乎是瞬间的,在10 s内达到饱和容量的80%,而珠状吸附剂仅为12%。高的初始吸收速率符合壳核动力学模型,以吸附在圆柱几何形状的纤维上。使用4M HCl时,从纤维状吸附剂中剥离吸附的银络合物是干净的,几乎是瞬时的,与此相反,由于银的缓慢分解,在珠状吸附剂上的剥离速率较慢会导致其结垢。酸性介质中的硫代硫酸盐络合物。 (c)2006年Wiley Periodicals,Inc.

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