Three different kinds of sepiolite(Type A, Type B and Sepiolite fiber) were processed by calcination and analyzed by thermogravimetric analysis(TG), X-ray diffraction diffractometer(XRD), scanning electron microscopy(...Three different kinds of sepiolite(Type A, Type B and Sepiolite fiber) were processed by calcination and analyzed by thermogravimetric analysis(TG), X-ray diffraction diffractometer(XRD), scanning electron microscopy(SEM), BET(specific surface area from N2 adsorption isotherms), mercury intrusion porosimetry(MIP), and infrared spectroscopic analysis(IR), respectively. The results show that the adsorption performance of sepiolite can be changed by calcination and environment temperatures, especially for calcination. The adsorption capacity of sepiolite fiber is bigger than that of Type A and B, and adsorption capacity of each sepiolite to sulfate is smaller than that of the chloride ions. Especially, the maximum value for adsorption of the sepiolite fibers, calcined at 600 ℃ and water bath at 60 ℃, to chlorine ion and sulfate are 5.95 and 5.71 mg/g, respectively(mg/g : the ions quantity adsorbed by a unit of sepiolite weight). The minimum adsorption of calcined sepiolite fiber to sulfate ions increased from 5.02 to 5.55 mg/g. While microstructure analysis of sepiolite by TG indicated that its structure was, for temperature not exceeding 700 ℃, was not changed significantly. Sepiolite has a porous structure, especially for sepiolite fiber, which can be observed by SEM. BET indicates that sepiolite fiber has a larger pore volume than others and this can be increased by calcination. IR shows that the adsorption of sepiolite to Cl-and SO42- belongs to physical absorption, instead of chemisorption.展开更多
本文建立了离子色谱-抑制电导法检测喹啉酸中的氯离子的方法。实验采用SH-AC-1型离子交换色谱柱,最佳色谱条件为:以1.8 mmNa2CO3和1.7 mm NaHCO3的淋洗液,柱温45℃,流速1.5 mL.min-1。在此条件下,Cl-色谱峰型对称。所测Cl-的检出限(S/N...本文建立了离子色谱-抑制电导法检测喹啉酸中的氯离子的方法。实验采用SH-AC-1型离子交换色谱柱,最佳色谱条件为:以1.8 mmNa2CO3和1.7 mm NaHCO3的淋洗液,柱温45℃,流速1.5 mL.min-1。在此条件下,Cl-色谱峰型对称。所测Cl-的检出限(S/N=3)分别为0.005 mg.L-1。应用本方法测定Cl-,加标回收率在96%～104%之间。本方法简单,准确,可靠,具有较好的实用性。展开更多
建立离子色谱法测定2-羧乙基苯基次膦酸中氯离子的含量。样品用超纯水溶解稀释,过0.22μm滤膜;选用SH–AC–2阴离子分离柱,以30 mmol/L Na OH溶液作为淋洗液,流量为1.0 m L/min,进样体积为50μL,以抑制电导检测器测定氯离子的含量。氯...建立离子色谱法测定2-羧乙基苯基次膦酸中氯离子的含量。样品用超纯水溶解稀释,过0.22μm滤膜;选用SH–AC–2阴离子分离柱,以30 mmol/L Na OH溶液作为淋洗液,流量为1.0 m L/min,进样体积为50μL,以抑制电导检测器测定氯离子的含量。氯离子的质量浓度在0.01~1.00 mg/L范围内与色谱峰面积线性关系良好,相关系数为0.996,氯离子的检出限(S/N=3)为1.0μg/L。测定结果的相对标准偏差小于10%(n=6),样品加标回收率为94.7%~103.5%。该方法简便、快速且灵敏,可用于2-羧乙基苯基次膦酸中氯离子的测定。展开更多
基金Funded by National Natural Science Foundation of China(No.51408380)the National Key Research and Development Program of China(No.2018 YFD0200200)Shijiazhuang Tiedao University Postgraduate Innovation Funding Project(No.YC2019054).
文摘Three different kinds of sepiolite(Type A, Type B and Sepiolite fiber) were processed by calcination and analyzed by thermogravimetric analysis(TG), X-ray diffraction diffractometer(XRD), scanning electron microscopy(SEM), BET(specific surface area from N2 adsorption isotherms), mercury intrusion porosimetry(MIP), and infrared spectroscopic analysis(IR), respectively. The results show that the adsorption performance of sepiolite can be changed by calcination and environment temperatures, especially for calcination. The adsorption capacity of sepiolite fiber is bigger than that of Type A and B, and adsorption capacity of each sepiolite to sulfate is smaller than that of the chloride ions. Especially, the maximum value for adsorption of the sepiolite fibers, calcined at 600 ℃ and water bath at 60 ℃, to chlorine ion and sulfate are 5.95 and 5.71 mg/g, respectively(mg/g : the ions quantity adsorbed by a unit of sepiolite weight). The minimum adsorption of calcined sepiolite fiber to sulfate ions increased from 5.02 to 5.55 mg/g. While microstructure analysis of sepiolite by TG indicated that its structure was, for temperature not exceeding 700 ℃, was not changed significantly. Sepiolite has a porous structure, especially for sepiolite fiber, which can be observed by SEM. BET indicates that sepiolite fiber has a larger pore volume than others and this can be increased by calcination. IR shows that the adsorption of sepiolite to Cl-and SO42- belongs to physical absorption, instead of chemisorption.
文摘建立离子色谱法测定2-羧乙基苯基次膦酸中氯离子的含量。样品用超纯水溶解稀释,过0.22μm滤膜;选用SH–AC–2阴离子分离柱,以30 mmol/L Na OH溶液作为淋洗液,流量为1.0 m L/min,进样体积为50μL,以抑制电导检测器测定氯离子的含量。氯离子的质量浓度在0.01~1.00 mg/L范围内与色谱峰面积线性关系良好,相关系数为0.996,氯离子的检出限(S/N=3)为1.0μg/L。测定结果的相对标准偏差小于10%(n=6),样品加标回收率为94.7%~103.5%。该方法简便、快速且灵敏,可用于2-羧乙基苯基次膦酸中氯离子的测定。
