钛基镍-铁合金电极的制备及其析氢性能

采用恒电位电沉积法,在钛板上制备Ni-Fe合金电极。通过测量Ni-Fe合金电极在1 mol/L NaOH溶液中的阴极极化曲线,讨论了电沉积液中FeSO_4·7H_2O质量浓度、电沉积电位和时间对Ni-Fe合金电极析氢性能的影响,得到电沉积的最优工艺条件为:NiSO_4·6H_2O 100 g/L,FeSO_4·7H_2O 15 g/L,H_3BO_3 20 g/L,抗坏血酸5 g/L,十二烷基硫酸钠1 g/L,pH=3.5,温度25℃,电位-1.3 V(相对于饱和甘汞电极),时间30 s。当电流密度为0.05 A/cm^2时,Ni-Fe合金电极在1 mol/L NaOH溶液中的析氢过电位比Ni电极低23%。Ni-Fe合金电极表面比Ni电极表面粗糙,其表面的Ni、Fe含量比约为2:3。

反应性微凝胶/尼龙6共混物的非等温结晶动力学（英文）

The non-isothermal crystallization kinetics of reactive microgel/nylon 6 blends was investigated by differential scanning calorimetry(DSC). The Mo equation was employed to analyze the non-isothermal crystallization data. The crystallization activation energies were also evaluated by the Kissinger method. The results show that the crystallization onset temperature(T onset) and crystallization peak temperature(T p) decrease with the increase of the content of reactive microgel, while ΔT(T onset–T p), the crystallization half-time(t1/2) and the crystallization enthalpy(ΔH c) increase. The required cooling rates of blends are higher than that of neat nylon6 in order to achieve the same relative crystallinity in a unit of time. The crystallization activation energies of the reactive microgel/nylon 6 blends are greater than those of the neat nylon 6. When the content of reactive microgel is 30%, the relative crystallinity(X t) reaches the maximum.

高温水解-离子色谱法测定废盐中氟和氯含量的测试条件

废盐中氟和氯存在于无机物有机物中,其在焚烧处置时会严重腐蚀窑体,现有卤素测试的前处理缺乏同时兼顾有机氟氯和无机氟氯的前处理方法。探索采用高温水解-离子色谱法对废盐中不同存在形式的氟和氯含量进行同时测试,针对测试过程中氧气流量、水蒸气流量、水解时间、水解温度等因素对测定废盐中氟和氯含量准确性的影响进行研究,得出测试废盐中氟和氯含量的最佳测试条件为:氧气流量0.4 L/min,水蒸气流量2 mL/min,测试温度1150℃,高温水解时间不少于30 min。在0~20 mg/L的线性范围内,氟和氯标准曲线线性相关系数均在0.999以上,检出限分别为0.02 mg/L、0.03 mg/L,相对标准偏差均在2%以内,空白加标测试氟的回收率在96.51%~101.68%,氯的回收率在99.67%~101.48%,而废盐样品加标测试氟的回收率在97.39%~103.92%,氯的回收率在92.25%~99.13%。高温燃烧水解的前处理方式可解决废盐中有机物与无机物中卤素需分开进行前处理的状况,采用高温水解-离子色谱法对废盐中不同存在形式的氟和氯含量进行同时测试,其结果精密度好,回收率高。