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Adsorption of Cd(Ⅱ) from acidic aqueous solutions by tourmaline as a novel material

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Chinese Science Bulletin 2012年第24期57卷 3218-3225页

作者： WANG CuiPing WANG BaoLin LIU JingTing YU Li SUN HongWen wu jizhou Key Laboratory of Pollution Processes and Environmental Criteria of the Ministry of Education College of Environmental Science andEngineeringNankai UniversityTianjin 300071China

Batch experiments were conducted to investigate the behavior and mechanisms for the adsorption of Cd(Ⅱ) from aqueous solutions by tourmaline under acidic conditions. The results indicated that the adsorption of Cd(Ⅱ) significantly depend on the adsorption time, temperature, and the initial concentration of the metal ion. Furthermore, tourmaline had a very good adsorption capacity for Cd(Ⅱ) in acidic, neutral and alkaline aqueous solutions. This good adsorption capacity is attributed to the observation that tourmaline can automatically adjust the pH values of acidic (except pH 2.0 and 3.0), neutral or alkaline aqueous solutions to 6.4. Specifically, the removal capacity for Cd(Ⅱ) was higher at strongly acidic pH values (in contrast to industrial wastewater pH values) compared to that obtained for other types of adsorbents. Furthermore, the results obtained in this study showed good fits to the Langmuir and Freundlich adsorption isotherms. However, the Langmuir model fit better than the Freundlich model. The maximum uptake of Cd(Ⅱ) by tourmaline was 31.77, 33.11 and 40.16 mg/g at pH 4.0 at 15, 25 and 35°C, respectively. Therefore, tourmaline is an effective adsorbent for the removal of Cd(Ⅱ) from acidic aqueous solutions. In addition, the kinetics for the Cd(Ⅱ) adsorption by tourmaline closely followed the pseudo-second-order model. The thermodynamic parameters indicated that adsorption was feasible, spontaneous, and endothermic. Furthermore, the pH variation after adsorption, ζ-potential, metal ions desorbed and released, and FT-IR analysis indicated that the physisorption and chemisorption mechanisms of tourmaline for heavy metals. These mechanisms included water that was automatically polarized by tourmaline, the ion exchange process, and electropolar adsorption. Among the mechanisms, the automatic polarization of water caused by tourmaline is a unique adsorption mechanism for tourmaline.

关键词：酸性水溶液吸附时间镉(Ⅱ) 电气石 Langmuir模型 Freundlich模型碱性水溶液 Cd(Ⅱ)

Atom-optically synthetic gauge fields for a noninteracting Bose gas

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Light(Science & Applications) 2022年第3期11卷 15-21页

作者： Yuqing Li Jiahui Zhang Yunfei Wang Huiying Du jizhou wu Wenliang Liu Feng Mei Jie Ma Liantuan Xiao Suotang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShanxi030006China

Synthetic gauge fields in synthetic dimensions are now of great *** concept provides a convenient manner for exploring topological phases of ***,we report on the first experimental realization of an atom-optically synthetic gauge field based on the synthetic momentum-state lattice of a Bose gas of ^(133)Cs atoms,where magnetically controlled Feshbach resonance is used to tune the interacting lattice into noninteracting ***,we engineer a noninteracting one-dimensional lattice into a two-leg ladder with tunable synthetic gauge *** observe the flux-dependent populations of atoms and measure the gauge field-induced chiral currents in the two *** also show that an inhomogeneous gauge field could control the atomic transport in the *** results lay the groundwork for using a clean noninteracting synthetic momentum-state lattice to study the gauge field-induced topological physics.

关键词： gauge interacting synthetic

Wide and fast-frequency tuning for a stabilized diode laser

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Frontiers of physics 2022年第2期17卷 1-5页

作者： Yunfei Wang Yuqing Li jizhou wu Wenliang Liu Peng Li Yongming Fu Jie Ma Liantuan Xiao Suotang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyCollege of Physics and Electronics EngineeringShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China College of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China

External-cavity diode laser(ECDL)has important applications in many fundamental and applied *** we report a method to fast and widely tune the frequency of a stabilized *** beat frequency between the ECDL and a frequency-locked reference laser is identified by the voltagecontrolled oscillator contained in a phase detector,whose output voltage is subtracted from the flexibly controlled PC signal to generate an error signal for stabilizing the *** output frequency of the stabilized ECDL can be shifted at a short characteristic time of∼150µs within a range of∼620 *** wide and fast-frequency tuning achieved by our method is compared with other previous *** demonstrated the performance of our method by the efficient sub-Doppler cooling of Cs atoms with the temperature as low as 6µK.

关键词： external-cavity diode laser frequency stabilization laser cooling interaction of laser with atoms

Effect of external magnetic field on the shift of resonant frequency in photoassociation of ultracold Cs atoms

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Chinese Physics B 2019年第1期28卷 367-371页

作者： Pengwei Li Yuqing Li Guosheng Feng jizhou wu Jie Ma Liantuan Xiao Suotang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyCollege of Physics and Electronics Engineering Shanxi University Collaborative Innovation Center of Extreme Optics Shanxi University

We study the influence of external magnetic field on the shift of the resonant frequency in the photoassociation of ultracold Cs atoms, which are captured in a magnetically levitated optical crossed dipole trap. With the increase of the photoassociation laser intensity, the linear variation of the frequency shift is measured by recording the photoassociation spectra of the long-range 0_u^+ state of Cs molecule below the 6S_(1/2)+ 6P_(1/2) dissociation limit at different magnetic *** slope of the frequency shift to the intensity of the photoassociation laser exhibits a strong dependence on the external magnetic field. The experimental data is simulated with an analytic theory model, in which a single channel rectangular potential with the tunable well depth is introduced to acquire the influence of the magnetic field on the atomic behavior in the effective range where photoassociation occurs.

关键词： ultracold molecule photoassociation frequency shift

Generation of coherent blue light via bichromatic pumping in cesium vapor

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Frontiers of physics 2023年第4期18卷 283-290页

作者： Guiyuan Ge Li Tian Guoqing Zhang Ningxuan Zheng Wenliang Liu Vladimir Sovkov jizhou wu Yuqing Li Yongming Fu Peng Li Jie Ma Liantuan Xiao Suotang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China St.Petersburg State University 7/9 Universitetskaya nab.St.Petersburg 199034Russia College of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230088China

Diode-pumped alkali lasers,possessing high efficiency and narrow linewidth,can provide feasible solutions for wavelength ranges difficult to reach by commercial *** this study,we investigate a generation of coherent blue light(CBL)via four-wave mixing(FWM)-based up-conversion processes in cesium(Cs)vapor.A bichromatic pumping scheme with 852-and 917-nm lasers drives the Cs atoms to the 6D5/2 excited level,followed by cascaded decay of 6D5/2→7 P3/2→6 S1/2,producing 456-nm CBL under phase matching *** fluorescence in multiple bands from blue to near-and far-infrared in the FWM process is demonstrated under different experimental *** optimize the experimental parameters,we investigate the dependence of 456-nm CBL on the vapor temperature,frequency,and intensity of the two pump lasers.A maximum power of 2.94 mW is achieved with pump powers of 430 mW(for 852 nm)and 470 mW(for 917 nm).The corresponding conversion efficiency is 1.5%/W,three-fold higher than those in previous *** results can contribute to fundamental research on atom–photon interactions and quantum metrology.

关键词： four wave mixing conversion coherent blue beam bichromatic pumping

Spin current in a spinor Bose–Einstein condensate induced by a gradient magnetic field

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Chinese Physics B 2022年第11期31卷 207-210页

作者： Li Tian Ningxuan Zheng Jun Jian Wenliang Liu jizhou wu Yuqing Li Yongming Fu Peng Li Vladimir Sovkov Jie Ma Liantuan Xiao Suotang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China School of Science Key Laboratory of High Performance Scientific ComputationXihua UniversityChengdu 610039China St.Petersburg State University 7/9 Univrsieskaya nab.St.Petersburg 199034Russia

We develop a research of spin currents in a^(23)Na spinor Bose–Einstein condensate(BEC)by applying a magnetic field *** spin current is successfully induced by the spin-dependent force arising from the magnetic field *** dynamics of the spin components under the magnetic force is *** study is promising to be extended to produce a longer spin-coherence and to enhance the sensitivity of the spin-mixing interferometry in a spinor BEC.

关键词： spinor Bose-Einstein condensate spin current

Superfluid to Mott-insulator transition in a one-dimensional optical lattice

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Chinese Physics B 2022年第7期31卷 268-271页

作者： Wenliang Liu Ningxuan Zheng Jun Jian Li Tian jizhou wu Yuqing Li Yongming Fu Peng Li Vladimir Sovkov Jie Ma Liantuan Xiao Suotang Jia State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China School of Science Key Laboratory of High Performance Scientific ComputationXihua UniversityChengdu 610039China St.Petersburg State University 7/9 Universitetskaya nab.St.Petersburg 199034Russia

Bose–Einstein condensates(BEC)of sodium atoms are transferred into one-dimensional(1D)optical lattice potentials,formed by two laser beams with a wavelength of 1064 nm,in a shallow optical *** phase coherence of the condensate in the lattice potential is studied by changing the lattice depth.A qualitative change in behavior of the BEC is observed at a lattice depth of~13.7Er,where the quantum gas undergoes a transition from a superfluid state to a state that lacks well-to-well phase coherence.

关键词： Bose–Einstein condensate optical lattice superfluid Mott-insulator phase

Efficient loading of cesium atoms in a magnetic levitated dimple trap

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Chinese Physics B 2024年第2期33卷 324-328页

作者：张国庆冯国胜李玉清武寄洲马杰 State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyCollege of Physics and Electronics EngineeringShanxi UniversityTaiyuan 030006China Department of Magnetic Resonance Imaging The First Hospital of Shanxi Medical UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

We report a detailed study of magnetically levitated loading of ultracold ^(133)Cs atoms in a dimple *** atomic sample was produced in a combined red-detuned optical dipole trap and dimple trap formed by two small waist beams crossing a horizontal *** magnetic levitation for the ^(133)Cs atoms forms an effective potential for a large number of atoms in a high spatial *** of the number of atoms loaded and trapped in the dimple trap on the magnetic field gradient and bias field is in good agreement with the theoretical *** method has been widely used to obtain the Bose–Einstein condensation atoms for many atomic species.

关键词： ultracold atom magnetic levitation dimple trap

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定向井有杆泵抽油动态预测

石油学报 1994年第2期15卷 133-138页

作者：吴继周宋考平大庆石油学院

本文综合分析了定向井中有杆泵抽油的抽油杆柱、液柱和油管柱的受力情况，得到一组描述其运动规律的偏微分方程组，用有限差分法进行了求解。该模型可对定向井有杆泵抽油进行动态分析和优化诊断。

关键词：定向井有杆泵动态预测抽油机