通过溶液中的过硫酸铵与D301树脂表面的叔胺基形成氧化-还原引发体系,将水溶性阳离子烯类功能单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝到D301树脂表面,制得了新型阴离子型离子交换树脂D301-g-PDMC。考察了主要接枝条件(时间、温度、...通过溶液中的过硫酸铵与D301树脂表面的叔胺基形成氧化-还原引发体系,将水溶性阳离子烯类功能单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝到D301树脂表面,制得了新型阴离子型离子交换树脂D301-g-PDMC。考察了主要接枝条件(时间、温度、引发剂及单体用量)对接枝度的影响,并研究了D301-g-PDMC对AuCl_4^-的吸附性能。结果表明,反应时间为10 h,反应温度为35℃,过硫酸铵用量为1.6%,DMC用量为17 m L时,PDMC的接枝度最高,可达26.67%。D301-g-PDMC对AuCl_4^-有很强的吸附能力,吸附容量可以达到748.03 mg/g。此外,D301-g-PDMC对AuCl_4^-的吸附效率可达97.83%。展开更多
Monodispersed poly（glycidyl methacrylate）（PGMA） microspheres with various amounts of amino groups（PGMA-NH2） were used to adsorb Au（Ⅲ） from simulated wastewaters. Gold nanoparticle-coated PGMA functional micro...Monodispersed poly（glycidyl methacrylate）（PGMA） microspheres with various amounts of amino groups（PGMA-NH2） were used to adsorb Au（Ⅲ） from simulated wastewaters. Gold nanoparticle-coated PGMA functional microspheres can be directly obtained via the adsorption process. The adsorption kinetics follows pseudo-second model, and 10 min is enough for reaching at equilibrium. The adsorption isotherm follows Langmuir model, and the adsorption amounts for Au（Ⅲ） are 8.25 and 21.75 mol·kg^-1 at 298 and 328 K, respectively. The relative separation coefficients between Au（Ⅲ）, Pt（Ⅵ）, Pd（Ⅱ）and Co（Ⅱ）, Cu（Ⅱ）; Ni（Ⅱ）, Fe（Ⅲ） are all higher than 100 when 1 〈 pH 〈 3. Furthermore, the characterization analysis of X-ray diffraction（XRD）, thermogravimetrydifferential scanning calorimetry（TG-DSC）, scanning electron microscopy-energy dispersive spectroscopy（SEM-EDS）, transmission electron microscopy（TEM） and Fourier transform infrared spectroscopy（FTIR） confirms that AuCl4^-has been reduced to Au^0 nanoparticles and deposited onto the surface of PGMA-NH2. The current work shows a good prospect for PGMA-NH2 to be a valid adsorbent for the recovery of gold and the possible fabrication of gold nanoparticles by reduction-deposition process without any reductant.展开更多
文摘通过溶液中的过硫酸铵与D301树脂表面的叔胺基形成氧化-还原引发体系,将水溶性阳离子烯类功能单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝到D301树脂表面,制得了新型阴离子型离子交换树脂D301-g-PDMC。考察了主要接枝条件(时间、温度、引发剂及单体用量)对接枝度的影响,并研究了D301-g-PDMC对AuCl_4^-的吸附性能。结果表明,反应时间为10 h,反应温度为35℃,过硫酸铵用量为1.6%,DMC用量为17 m L时,PDMC的接枝度最高,可达26.67%。D301-g-PDMC对AuCl_4^-有很强的吸附能力,吸附容量可以达到748.03 mg/g。此外,D301-g-PDMC对AuCl_4^-的吸附效率可达97.83%。
基金financially supported by the National Natural Science Foundation of China(Nos.51504073 and 51404081)the Joint Research Program of the Science and Technology Department of Guizhou Province(No.QianKeHe LH [2014] 7373)+1 种基金the Research Program of the Education Department of Guizhou Province (No.QianJiaoKeHe KY [2015]433)the Research Program of Talented Scholars of Guizhou Institute of Technology (No.XJG20141104)
文摘Monodispersed poly（glycidyl methacrylate）（PGMA） microspheres with various amounts of amino groups（PGMA-NH2） were used to adsorb Au（Ⅲ） from simulated wastewaters. Gold nanoparticle-coated PGMA functional microspheres can be directly obtained via the adsorption process. The adsorption kinetics follows pseudo-second model, and 10 min is enough for reaching at equilibrium. The adsorption isotherm follows Langmuir model, and the adsorption amounts for Au（Ⅲ） are 8.25 and 21.75 mol·kg^-1 at 298 and 328 K, respectively. The relative separation coefficients between Au（Ⅲ）, Pt（Ⅵ）, Pd（Ⅱ）and Co（Ⅱ）, Cu（Ⅱ）; Ni（Ⅱ）, Fe（Ⅲ） are all higher than 100 when 1 〈 pH 〈 3. Furthermore, the characterization analysis of X-ray diffraction（XRD）, thermogravimetrydifferential scanning calorimetry（TG-DSC）, scanning electron microscopy-energy dispersive spectroscopy（SEM-EDS）, transmission electron microscopy（TEM） and Fourier transform infrared spectroscopy（FTIR） confirms that AuCl4^-has been reduced to Au^0 nanoparticles and deposited onto the surface of PGMA-NH2. The current work shows a good prospect for PGMA-NH2 to be a valid adsorbent for the recovery of gold and the possible fabrication of gold nanoparticles by reduction-deposition process without any reductant.
