电控离子交换技术(electrochemically switched ion exchange,ESIX)是将电活性离子交换材料(EXIMs)沉积或涂覆在导电基底上,通过电化学控制导电基底上活性材料氧化还原状态实现目标离子置入与释放,从而实现离子的分离。该技术具有痕量...电控离子交换技术(electrochemically switched ion exchange,ESIX)是将电活性离子交换材料(EXIMs)沉积或涂覆在导电基底上,通过电化学控制导电基底上活性材料氧化还原状态实现目标离子置入与释放,从而实现离子的分离。该技术具有痕量提取、无二次污染、速率可控、高选择性等优点。通过共沉淀法制备Ni Fe Mn LDH,并将其与碳纳米管(CNTs)、聚偏二氟乙烯(PVDF)混合涂覆到石墨板上,制得NiFeMn LDH/CNTs/PVDF膜电极。NiFeMn LDH层板上具有丰富的羟基官能团,可与W(Ⅵ)发生羟基配位;层间的阴离子与W(Ⅵ)进行离子交换,可为W(Ⅵ)提供丰富的活性位点。在ESIX系统中,膜电极对W(Ⅵ)的吸附容量可达122.10 mg·g^(-1),且W(Ⅵ)与Mo(Ⅵ)、Cl^(-)、■分离因子(■)分别为1.25、19.60、35.80,实现了W(Ⅵ)选择性分离。此外,该膜电极具有优异的循环稳定性,为钨的高效分离提供了新的方向。展开更多
文中介绍了一种以复合敏感膜为离子载体的新型全固态硫酸根离子选择性电极的制备方法及其性能表征结果。该电极以金丝为基材,利用化学、电化学方法在其表面原位合成聚巯基苯胺层,其外部包覆纳米铅进而合成硫酸铅钡与硫酸铅混合膜,对水...文中介绍了一种以复合敏感膜为离子载体的新型全固态硫酸根离子选择性电极的制备方法及其性能表征结果。该电极以金丝为基材,利用化学、电化学方法在其表面原位合成聚巯基苯胺层,其外部包覆纳米铅进而合成硫酸铅钡与硫酸铅混合膜,对水体中硫酸根离子浓度进行检测。该电极在硫酸根离子浓度为10^(-4)~10^(-1)mol/L的范围内呈现出良好的线性关系,符合Nernst定律,检测下限为10^(-4)mol/L。所测电压与硫酸根离子浓度的负对数之间斜率为-27.13 m V/dec。由于该电极体积微小,易与温度、盐度、p H电极等多种电极集成在同一传感器探头内,实现对水体中多种参数的实时在线监测。该电极制备简易、操作简便,电信号响应迅速,具有较好的应用前景。展开更多
Designing a new material to fabricate electrodes sensitive to ion species of specific interest is the main stream in the ion sensitive electrode research. The research efforts of the present authors have been directed...Designing a new material to fabricate electrodes sensitive to ion species of specific interest is the main stream in the ion sensitive electrode research. The research efforts of the present authors have been directed, in particular, to the development of a phosphate ion sensitive electrode based on non-stoichiometric compound Co1-rO and a Cu2+ ion sensitive electrode based on LaB6. In this paper, a new sulfate ion sensitive electrode is reported based on non-crystal Ni-P alloy, which has a very nice response characteristics including stability, selectivity and linear response range. The electrode shows a linear range of response from 1×10-6 to 1 X 10-2 mol/L and a detection limit of 4×10-7mol/L for the sulfate ion. The selectivity coefficients for common anions Cl-, NO3-, H2PO4-, Br- and I- are obtained as 2×10-1, 8×10-5, 8×10-3, 3×10-1 and 4×10-1, respectively. The electrochemical deposition of the non-crystal Ni-P alloy on different matrix materials has been described for preparation of the titled electrode.展开更多
文摘电控离子交换技术(electrochemically switched ion exchange,ESIX)是将电活性离子交换材料(EXIMs)沉积或涂覆在导电基底上,通过电化学控制导电基底上活性材料氧化还原状态实现目标离子置入与释放,从而实现离子的分离。该技术具有痕量提取、无二次污染、速率可控、高选择性等优点。通过共沉淀法制备Ni Fe Mn LDH,并将其与碳纳米管(CNTs)、聚偏二氟乙烯(PVDF)混合涂覆到石墨板上,制得NiFeMn LDH/CNTs/PVDF膜电极。NiFeMn LDH层板上具有丰富的羟基官能团,可与W(Ⅵ)发生羟基配位;层间的阴离子与W(Ⅵ)进行离子交换,可为W(Ⅵ)提供丰富的活性位点。在ESIX系统中,膜电极对W(Ⅵ)的吸附容量可达122.10 mg·g^(-1),且W(Ⅵ)与Mo(Ⅵ)、Cl^(-)、■分离因子(■)分别为1.25、19.60、35.80,实现了W(Ⅵ)选择性分离。此外,该膜电极具有优异的循环稳定性,为钨的高效分离提供了新的方向。
文摘文中介绍了一种以复合敏感膜为离子载体的新型全固态硫酸根离子选择性电极的制备方法及其性能表征结果。该电极以金丝为基材,利用化学、电化学方法在其表面原位合成聚巯基苯胺层,其外部包覆纳米铅进而合成硫酸铅钡与硫酸铅混合膜,对水体中硫酸根离子浓度进行检测。该电极在硫酸根离子浓度为10^(-4)~10^(-1)mol/L的范围内呈现出良好的线性关系,符合Nernst定律,检测下限为10^(-4)mol/L。所测电压与硫酸根离子浓度的负对数之间斜率为-27.13 m V/dec。由于该电极体积微小,易与温度、盐度、p H电极等多种电极集成在同一传感器探头内,实现对水体中多种参数的实时在线监测。该电极制备简易、操作简便,电信号响应迅速,具有较好的应用前景。
文摘Designing a new material to fabricate electrodes sensitive to ion species of specific interest is the main stream in the ion sensitive electrode research. The research efforts of the present authors have been directed, in particular, to the development of a phosphate ion sensitive electrode based on non-stoichiometric compound Co1-rO and a Cu2+ ion sensitive electrode based on LaB6. In this paper, a new sulfate ion sensitive electrode is reported based on non-crystal Ni-P alloy, which has a very nice response characteristics including stability, selectivity and linear response range. The electrode shows a linear range of response from 1×10-6 to 1 X 10-2 mol/L and a detection limit of 4×10-7mol/L for the sulfate ion. The selectivity coefficients for common anions Cl-, NO3-, H2PO4-, Br- and I- are obtained as 2×10-1, 8×10-5, 8×10-3, 3×10-1 and 4×10-1, respectively. The electrochemical deposition of the non-crystal Ni-P alloy on different matrix materials has been described for preparation of the titled electrode.
