开发用于高级氧化技术的廉价易得、高效稳定的催化剂对于水处理至关重要.以水滑石/壳聚糖为前驱体开发了一种新型“原位沉淀-煅烧”法制备磁性氮掺杂碳负载CoFe_(2)O_(4)-CoO催化剂(LDO/NC).该催化剂用于活化过一硫酸盐(PMS)降解四环素(...开发用于高级氧化技术的廉价易得、高效稳定的催化剂对于水处理至关重要.以水滑石/壳聚糖为前驱体开发了一种新型“原位沉淀-煅烧”法制备磁性氮掺杂碳负载CoFe_(2)O_(4)-CoO催化剂(LDO/NC).该催化剂用于活化过一硫酸盐(PMS)降解四环素(TC),表现出明显优于单纯水滑石氧化物(LDO)和氮掺杂碳(NC)的催化活性.这是由于壳聚糖作为碳源和氮源的原位引入成功抑制了钴铁金属氧化物团聚,同时N原子的掺杂增强电子转移,协同催化提高活性.研究了催化剂组成、催化剂用量、PMS用量和初始pH值等因素对TC降解效率的影响规律.最佳条件下(PMS用量0.4 g L^(-1),LDO/NC用量0.5 g L^(-1),pH=5),30 min内TC的降解率和总碳去除率分别达到97.8%和81.0%.该催化剂可磁性回收且循环使用五次以上,稳定性保持良好.提供了一种用于催化PMS氧化处理制药废水的绿色催化剂.展开更多
Well-aligned and uniform Coo.sZno.2Fe204 nanofibers （NFs） are prepared by electrospinning via sol-gel and sub- sequent heat treatment. Each of the as-spun NFs has a diameter of about 300 nm and a smooth surface morp...Well-aligned and uniform Coo.sZno.2Fe204 nanofibers （NFs） are prepared by electrospinning via sol-gel and sub- sequent heat treatment. Each of the as-spun NFs has a diameter of about 300 nm and a smooth surface morphology. The scanning electron microscope （SEM） image shows that the diameter decreases to 70 nm after the Coo.sZno.2Fe204 NF has been annealed at 650℃ for 3 h. The structure and chemical of Co0.8Zn0.2Fe204 NF are investigated by X- ray diffraction （XRD） and energy dispersive X-ray spectroscopy （EDS）, respectively. Single phase cubic spinel structure, Coo.sZno.2Fe204 NF, is successfully obtained after having been calcined at 550 ~C in air for 3 h, and a reduced lattice constant of the Coo.8Zno.2Fe204 NF provides the evidence of effective Zn2＋ substitution. The magnetic measurements show that the substitution of Zn2＋ for Co2＋ , i.e., the introduction of non-magnetic Zn2＋ ions into A sites, can increase the saturation magnetization （Ms） and reduce the coercivity （He）. The obtained Hc results of different samples reveal that the critical single-domain size of the Co0.8Zn0.2Fe204 NF is approximately 44 nm. By doping Zn2＋ with different concentra- tions, the morphologies of Co1-xZnxFe2O4 （0 〈 x 〈 0.5） NFs do not show obvious changes. For magnetic properties, the Ms increases and Hc decreases monotonically, respectively.展开更多
Inorganic additives-added PEO-based solid composite polymer electrolyte (SCPE) was prepared using solution casting method. The effects of LiNi0.8Co0.2O2 on the physical and chemical properties of the electrolyte were ...Inorganic additives-added PEO-based solid composite polymer electrolyte (SCPE) was prepared using solution casting method. The effects of LiNi0.8Co0.2O2 on the physical and chemical properties of the electrolyte were investigated. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR) and differential scanning calorimetry (DSC). The electrochemical performances of SCPE were measured. Results show that properties of the SCPE are improved significantly by adding LiNi0.8Co0.2O2 into PEO polymer electrolyte. Its conductivity reaches 5×10-4 S/cm(25 ℃) while retaining good mechanical and processing properties.展开更多
文摘开发用于高级氧化技术的廉价易得、高效稳定的催化剂对于水处理至关重要.以水滑石/壳聚糖为前驱体开发了一种新型“原位沉淀-煅烧”法制备磁性氮掺杂碳负载CoFe_(2)O_(4)-CoO催化剂(LDO/NC).该催化剂用于活化过一硫酸盐(PMS)降解四环素(TC),表现出明显优于单纯水滑石氧化物(LDO)和氮掺杂碳(NC)的催化活性.这是由于壳聚糖作为碳源和氮源的原位引入成功抑制了钴铁金属氧化物团聚,同时N原子的掺杂增强电子转移,协同催化提高活性.研究了催化剂组成、催化剂用量、PMS用量和初始pH值等因素对TC降解效率的影响规律.最佳条件下(PMS用量0.4 g L^(-1),LDO/NC用量0.5 g L^(-1),pH=5),30 min内TC的降解率和总碳去除率分别达到97.8%和81.0%.该催化剂可磁性回收且循环使用五次以上,稳定性保持良好.提供了一种用于催化PMS氧化处理制药废水的绿色催化剂.
基金Project supported by the National Natural Science Foundation of China(Grant No.50873047)the Foundation of Gansu Education Department,China(Grant No.0603-02)
文摘Well-aligned and uniform Coo.sZno.2Fe204 nanofibers （NFs） are prepared by electrospinning via sol-gel and sub- sequent heat treatment. Each of the as-spun NFs has a diameter of about 300 nm and a smooth surface morphology. The scanning electron microscope （SEM） image shows that the diameter decreases to 70 nm after the Coo.sZno.2Fe204 NF has been annealed at 650℃ for 3 h. The structure and chemical of Co0.8Zn0.2Fe204 NF are investigated by X- ray diffraction （XRD） and energy dispersive X-ray spectroscopy （EDS）, respectively. Single phase cubic spinel structure, Coo.sZno.2Fe204 NF, is successfully obtained after having been calcined at 550 ~C in air for 3 h, and a reduced lattice constant of the Coo.8Zno.2Fe204 NF provides the evidence of effective Zn2＋ substitution. The magnetic measurements show that the substitution of Zn2＋ for Co2＋ , i.e., the introduction of non-magnetic Zn2＋ ions into A sites, can increase the saturation magnetization （Ms） and reduce the coercivity （He）. The obtained Hc results of different samples reveal that the critical single-domain size of the Co0.8Zn0.2Fe204 NF is approximately 44 nm. By doping Zn2＋ with different concentra- tions, the morphologies of Co1-xZnxFe2O4 （0 〈 x 〈 0.5） NFs do not show obvious changes. For magnetic properties, the Ms increases and Hc decreases monotonically, respectively.
基金Sponsored by the Heilongjiang Province Post-Doctoral Foundation and Harbin Science Foundation(Grant No.2007RFXXG014)
文摘Inorganic additives-added PEO-based solid composite polymer electrolyte (SCPE) was prepared using solution casting method. The effects of LiNi0.8Co0.2O2 on the physical and chemical properties of the electrolyte were investigated. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR) and differential scanning calorimetry (DSC). The electrochemical performances of SCPE were measured. Results show that properties of the SCPE are improved significantly by adding LiNi0.8Co0.2O2 into PEO polymer electrolyte. Its conductivity reaches 5×10-4 S/cm(25 ℃) while retaining good mechanical and processing properties.
