A facile method for the preparation of sodium alginate（SA）/carboxyl-functionalized graphene（G-COOH）composite hydrogel was developed. Based on the coordination ability of lanthanide ions to the carboxyl groups, a s...A facile method for the preparation of sodium alginate（SA）/carboxyl-functionalized graphene（G-COOH）composite hydrogel was developed. Based on the coordination ability of lanthanide ions to the carboxyl groups, a series of hydrogel derived from different ratios of SA and G-COOH was fabricated by neodymium（Nd3＋） ions coordination. A relatively uniform layered structure was recorded by SEM at the interior of SA/G-COOH hydrogel. Several parameters such as water content, swelling ratio（SR）, tensile test and solvent resistance were also investigated. The SA/G-COOH composite hydrogel showed excellent mechanical strength, and the tensile strength of SA/G-COOH composite hydrogel reaches 53.72 MPa at high water content. Due to the coordination ability of Nd3＋ ions, the hydrogel also exhibited an excellent solvent resistance and stability.展开更多
建立了羧基化碳纳米管固相萃取-液相色谱-串联质谱联用检测环境水体中四溴双酚 A 和双酚 A 的方法。比较了多壁碳纳米管、C60和羧基化多壁碳纳米管作为固相吸附剂对水体中四溴双酚 A 和双酚 A 的吸附效率。固相萃取浓缩后的样品经 Therm...建立了羧基化碳纳米管固相萃取-液相色谱-串联质谱联用检测环境水体中四溴双酚 A 和双酚 A 的方法。比较了多壁碳纳米管、C60和羧基化多壁碳纳米管作为固相吸附剂对水体中四溴双酚 A 和双酚 A 的吸附效率。固相萃取浓缩后的样品经 Thermo Scientific Hypersil C18色谱柱（150 mm±4.6 mm，3μm）分离，采用串联质谱负离子模式进行检测。结果表明，四溴双酚 A 和双酚 A 在0.02～1.0 mg / L 范围内具有良好的线性关系（ r2≥0.99），空白样品中的检出限（S / N =3）分别为0.04μg / L 和0.2μg / L。将所建立的方法应用于实际环境水体中四溴双酚 A和双酚 A 的检测，添加回收率在82％～99％之间，精密度小于5.0％，该方法可用于复杂环境样品中痕量四溴双酚 A和双酚 A 的检测。展开更多
1-Methyl-3-carboxymethyl imidazolium chlorine（\C2OOHmim\Cl） ionic liquid surface-capped TiO 2 nanoparticles were prepared by using tetra-n-butyl titanate ethanol solution as a precursor. The structure of nanoparticl...1-Methyl-3-carboxymethyl imidazolium chlorine（\C2OOHmim\Cl） ionic liquid surface-capped TiO 2 nanoparticles were prepared by using tetra-n-butyl titanate ethanol solution as a precursor. The structure of nanoparticles was characterized by FTIR, TEM, XRD and XPS. The results confirmed that \KG-1/5C2OOHmim\·Cl ionic liquid combined with TiO 2 nanoparticles by chelation, the average diameter of TiO 2 nanoparticles was about 8 nm and anatase state was obtained. And only anatase existed even after calcinated at 750 ℃. As to the formation mechanism, we think that the inorganic-organic copolymerized surface-capped layer and repulsive force of positive charge played an important role in the formation and stabilization of TiO 2 nanoparticles.展开更多
用分散聚合的方法制得单分散、微米级聚苯乙烯微球(PS),以此聚苯乙烯微球作为种子,以1,2-二氯乙烷为溶胀剂、1-氯代十二烷为助溶胀剂、二乙烯基苯(DVB)为交联剂、α-甲基丙烯酸(MAA)和苯乙烯(Sty)为单体,采用种子溶胀聚合的方法成功制...用分散聚合的方法制得单分散、微米级聚苯乙烯微球(PS),以此聚苯乙烯微球作为种子,以1,2-二氯乙烷为溶胀剂、1-氯代十二烷为助溶胀剂、二乙烯基苯(DVB)为交联剂、α-甲基丙烯酸(MAA)和苯乙烯(Sty)为单体,采用种子溶胀聚合的方法成功制得粒径分布较窄的、由羧基修饰的单分散、微米级交联聚苯乙烯微球,研究了影响由羧基修饰的交联聚苯乙烯微球表面光滑度和粒径大小与分布的因素,以及在不同α-甲基丙烯酸浓度下所制备的由羧基修饰的交联聚苯乙烯微球的电导率,最终对交联聚苯乙烯微球的表面是否有羧基修饰做了定性分析。结果表明:用种子溶胀法成功制得了单分散并由羧基修饰的交联聚苯乙烯微球,并指出以2.0 g PS为种子时,MAA:(PS+Sty)为0.20～0.25时可制得表面光滑,粒径分布窄的由羧基修饰的交联聚苯乙烯微球。展开更多
基金supported by the National Natural Science Foundation of China under Grant Nos.21274020 and 21304019
文摘A facile method for the preparation of sodium alginate（SA）/carboxyl-functionalized graphene（G-COOH）composite hydrogel was developed. Based on the coordination ability of lanthanide ions to the carboxyl groups, a series of hydrogel derived from different ratios of SA and G-COOH was fabricated by neodymium（Nd3＋） ions coordination. A relatively uniform layered structure was recorded by SEM at the interior of SA/G-COOH hydrogel. Several parameters such as water content, swelling ratio（SR）, tensile test and solvent resistance were also investigated. The SA/G-COOH composite hydrogel showed excellent mechanical strength, and the tensile strength of SA/G-COOH composite hydrogel reaches 53.72 MPa at high water content. Due to the coordination ability of Nd3＋ ions, the hydrogel also exhibited an excellent solvent resistance and stability.
文摘建立了羧基化碳纳米管固相萃取-液相色谱-串联质谱联用检测环境水体中四溴双酚 A 和双酚 A 的方法。比较了多壁碳纳米管、C60和羧基化多壁碳纳米管作为固相吸附剂对水体中四溴双酚 A 和双酚 A 的吸附效率。固相萃取浓缩后的样品经 Thermo Scientific Hypersil C18色谱柱（150 mm±4.6 mm，3μm）分离，采用串联质谱负离子模式进行检测。结果表明，四溴双酚 A 和双酚 A 在0.02～1.0 mg / L 范围内具有良好的线性关系（ r2≥0.99），空白样品中的检出限（S / N =3）分别为0.04μg / L 和0.2μg / L。将所建立的方法应用于实际环境水体中四溴双酚 A和双酚 A 的检测，添加回收率在82％～99％之间，精密度小于5.0％，该方法可用于复杂环境样品中痕量四溴双酚 A和双酚 A 的检测。
文摘1-Methyl-3-carboxymethyl imidazolium chlorine（\C2OOHmim\Cl） ionic liquid surface-capped TiO 2 nanoparticles were prepared by using tetra-n-butyl titanate ethanol solution as a precursor. The structure of nanoparticles was characterized by FTIR, TEM, XRD and XPS. The results confirmed that \KG-1/5C2OOHmim\·Cl ionic liquid combined with TiO 2 nanoparticles by chelation, the average diameter of TiO 2 nanoparticles was about 8 nm and anatase state was obtained. And only anatase existed even after calcinated at 750 ℃. As to the formation mechanism, we think that the inorganic-organic copolymerized surface-capped layer and repulsive force of positive charge played an important role in the formation and stabilization of TiO 2 nanoparticles.
文摘用分散聚合的方法制得单分散、微米级聚苯乙烯微球(PS),以此聚苯乙烯微球作为种子,以1,2-二氯乙烷为溶胀剂、1-氯代十二烷为助溶胀剂、二乙烯基苯(DVB)为交联剂、α-甲基丙烯酸(MAA)和苯乙烯(Sty)为单体,采用种子溶胀聚合的方法成功制得粒径分布较窄的、由羧基修饰的单分散、微米级交联聚苯乙烯微球,研究了影响由羧基修饰的交联聚苯乙烯微球表面光滑度和粒径大小与分布的因素,以及在不同α-甲基丙烯酸浓度下所制备的由羧基修饰的交联聚苯乙烯微球的电导率,最终对交联聚苯乙烯微球的表面是否有羧基修饰做了定性分析。结果表明:用种子溶胀法成功制得了单分散并由羧基修饰的交联聚苯乙烯微球,并指出以2.0 g PS为种子时,MAA:(PS+Sty)为0.20～0.25时可制得表面光滑,粒径分布窄的由羧基修饰的交联聚苯乙烯微球。
