In this paper the self-regeneration process of the mixed resins consisting of cationand anion ion exchangers in the electrolialyser of the packed bed is analyzed and anelectric regeneration method is put forward to su...In this paper the self-regeneration process of the mixed resins consisting of cationand anion ion exchangers in the electrolialyser of the packed bed is analyzed and anelectric regeneration method is put forward to supply the desalinated water by mixedbed The electric regeneration technology is a new one used for regeneration of theexhausted ion exchangers in the mixed bed instead of the traditional regeneratingprocess by using acid and abc liquor Electric energy is consumed to regenerat theion exchangers loaded by salts from water treatment without any chemicals- acid alkali. The advantage of the electric regeneration process edibited convenientoperation, no discharge any waste, and therefore no Polluted to the recehang waterbode and the environmental ground展开更多
It was generally considered that contamination of the gel type polystyrenestrong basic anion exchange resin by organic matter in natural water is the result ofion exchange and Van der waal's adsorption on it. On t...It was generally considered that contamination of the gel type polystyrenestrong basic anion exchange resin by organic matter in natural water is the result ofion exchange and Van der waal's adsorption on it. On the basis of laboratory and industrial experiments, this paper confirmed that the interreaction between organicmatter and resin polymer matrix is primarily controled by a Van der waal's adsorption.展开更多
The exchange performances and the distribution coefficient of Cesium Ion-Sieve (Cs-IS) for cesium and for some rare earth elements were compared. In particula r, the effects of neodymium on the cesium ion exchange an...The exchange performances and the distribution coefficient of Cesium Ion-Sieve (Cs-IS) for cesium and for some rare earth elements were compared. In particula r, the effects of neodymium on the cesium ion exchange and the Cs+ selectivity v ariation on Cs-IS owing to introduction of rare earth elements into HLLW were s tudied. Though rare earth elements exhibit a small influence on the distributio n coefficient for Cs+, they impair Cs-exchange capacity of Cs-IS to some ext ent. This interruption on the selectivity to Cs+ can be significantly eliminat ed provided an appropriate ratio of liquid to solid V:m is used.展开更多
离子交换法常被应用于胺液净化领域,但是在低碱液浓度下部分离子交换树脂难以再生,存在失效的问题。利用SEM、EDS、FT-IR和XPS等手段对树脂的失效原因进行分析,并利用电再生的方法对失效树脂的再生进行了探究。实验结果显示,树脂净化胺...离子交换法常被应用于胺液净化领域,但是在低碱液浓度下部分离子交换树脂难以再生,存在失效的问题。利用SEM、EDS、FT-IR和XPS等手段对树脂的失效原因进行分析,并利用电再生的方法对失效树脂的再生进行了探究。实验结果显示,树脂净化胺液前后的骨架和功能基团并未改变,但是硫元素的质量分数显著提升,结合S 2p光谱存在162.2 eV和163.4 eV 2个分裂峰,说明树脂失效的主要原因是吸附的硫离子难以解吸;对失效树脂施加电再生时树脂的交换容量提升了3.6倍,吸附的硫元素质量分数下降了57.5%,表明电再生的方式可以提高树脂的交换容量和树脂内硫离子的解吸程度。展开更多
A high-surface-area carbon （KC-1） was prepared from waste polystyrene-based ion exchange resin by KOH activation and used for naphthalene adsorption. The carbon exhibited a good hydrophobic nature with developed por...A high-surface-area carbon （KC-1） was prepared from waste polystyrene-based ion exchange resin by KOH activation and used for naphthalene adsorption. The carbon exhibited a good hydrophobic nature with developed porous structure, favoring the adsorption of organic compounds. The Brunauer-Emmett-Teller surface area and total pore volume of KC- 1 were 3442.2 and 1.68 cm3/g, respectively, which can be compared with those of KOH-activated carbons prepared from other precursors. Batch experiments were carded out to investigate the adsorption of naphthalene onto KC-1. The equilibrium data were analyzed by the Langmuir, Freundlich, and Polanyi- Manes isotherms and agreed with the Polanyi-Manes Model. The adsorption of naphthalene depended greatly on the porosity of the carbon, and the dispersive interactions between naphthalene and carbon could be relatively weak. The pH variation in aqueous solution had little effect on the adsorption process. The equilibrium time for 0.04 g/L of carbon dose was around 5 hr. Different models were used to evaluate the kinetic data and the pseudo second-order model was suitable to describe the kinetic process of naphthalene adsorption onto KC-1. Regeneration of spent carbon could be carded out effectively by alcohol treatment. The results indicated that KC-1 was a promising adsorbent for the removal of polycyclic aromatic hydrocarbons from aqueous solutions.展开更多
文摘In this paper the self-regeneration process of the mixed resins consisting of cationand anion ion exchangers in the electrolialyser of the packed bed is analyzed and anelectric regeneration method is put forward to supply the desalinated water by mixedbed The electric regeneration technology is a new one used for regeneration of theexhausted ion exchangers in the mixed bed instead of the traditional regeneratingprocess by using acid and abc liquor Electric energy is consumed to regenerat theion exchangers loaded by salts from water treatment without any chemicals- acid alkali. The advantage of the electric regeneration process edibited convenientoperation, no discharge any waste, and therefore no Polluted to the recehang waterbode and the environmental ground
文摘It was generally considered that contamination of the gel type polystyrenestrong basic anion exchange resin by organic matter in natural water is the result ofion exchange and Van der waal's adsorption on it. On the basis of laboratory and industrial experiments, this paper confirmed that the interreaction between organicmatter and resin polymer matrix is primarily controled by a Van der waal's adsorption.
文摘The exchange performances and the distribution coefficient of Cesium Ion-Sieve (Cs-IS) for cesium and for some rare earth elements were compared. In particula r, the effects of neodymium on the cesium ion exchange and the Cs+ selectivity v ariation on Cs-IS owing to introduction of rare earth elements into HLLW were s tudied. Though rare earth elements exhibit a small influence on the distributio n coefficient for Cs+, they impair Cs-exchange capacity of Cs-IS to some ext ent. This interruption on the selectivity to Cs+ can be significantly eliminat ed provided an appropriate ratio of liquid to solid V:m is used.
文摘离子交换法常被应用于胺液净化领域,但是在低碱液浓度下部分离子交换树脂难以再生,存在失效的问题。利用SEM、EDS、FT-IR和XPS等手段对树脂的失效原因进行分析,并利用电再生的方法对失效树脂的再生进行了探究。实验结果显示,树脂净化胺液前后的骨架和功能基团并未改变,但是硫元素的质量分数显著提升,结合S 2p光谱存在162.2 eV和163.4 eV 2个分裂峰,说明树脂失效的主要原因是吸附的硫离子难以解吸;对失效树脂施加电再生时树脂的交换容量提升了3.6倍,吸附的硫元素质量分数下降了57.5%,表明电再生的方式可以提高树脂的交换容量和树脂内硫离子的解吸程度。
基金supported by the Program for Changjiang Scholars Innovative Research Team in Universitythe National Natural Science Foundation of China (No.51178215)
文摘A high-surface-area carbon （KC-1） was prepared from waste polystyrene-based ion exchange resin by KOH activation and used for naphthalene adsorption. The carbon exhibited a good hydrophobic nature with developed porous structure, favoring the adsorption of organic compounds. The Brunauer-Emmett-Teller surface area and total pore volume of KC- 1 were 3442.2 and 1.68 cm3/g, respectively, which can be compared with those of KOH-activated carbons prepared from other precursors. Batch experiments were carded out to investigate the adsorption of naphthalene onto KC-1. The equilibrium data were analyzed by the Langmuir, Freundlich, and Polanyi- Manes isotherms and agreed with the Polanyi-Manes Model. The adsorption of naphthalene depended greatly on the porosity of the carbon, and the dispersive interactions between naphthalene and carbon could be relatively weak. The pH variation in aqueous solution had little effect on the adsorption process. The equilibrium time for 0.04 g/L of carbon dose was around 5 hr. Different models were used to evaluate the kinetic data and the pseudo second-order model was suitable to describe the kinetic process of naphthalene adsorption onto KC-1. Regeneration of spent carbon could be carded out effectively by alcohol treatment. The results indicated that KC-1 was a promising adsorbent for the removal of polycyclic aromatic hydrocarbons from aqueous solutions.
