SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Yang Liu,Ping Gu,Yun Yang,Lin Jia,Mingdong Zhang,Guanghui Zhang
A novel integrated precipitation reactor (PR) and membrane separator (MS) system was developed for the removal of radioactive I − from simulated liquid waste. The PR-MS system was evaluated at the lab-scale, the I − removal efficiency reached approximately 97.0% and the concentration factor (CF) value was 1050 when the concentration of added Na 2 SO 3 was 40 mg/L and the CuCl dosage was 260 mg/L. The addition of Na 2 SO 3 played an important role in the removal of dissolved oxygen (DO) and the formation of CuI. These reactions, including the oxidation of SO 3 2− , the dissociation of CuCl, the disproportionation of Cu + , and the formation of CuI and Cu 2 O, occurred in the PR. Furthermore, the influence of the concentration of added CO 3 2− on copper removal was investigated, and solid-liquid separation and copper removal were simultaneously attained in the MS. The I − removal efficiency gradually decreased from 97.0% to 58.5% and the Cu 2+ concentration in the effluent decreased from 18.71 mg/L to 0.719 mg/L with the addition of CO 3 2− at a concentration that ranged from 0 to 80 mg/L. Experimental results show the PR-MS system is of great potential for industrial application on treatment of liquid waste contaminated with radioactive I − .
研究领域:
环境科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Chenglong Ji,Yuncai Gao,Yulu Wang,Ran Li,Yu-e Shi,Zhenguang Wang,Yongqing Zhai
Graphical The dim and short-lived RTP emissive organic molecules were transferred into afterglow materials with an emission efficiency of 45 % and emission lifetime of 1.9 s, through a straightforward coordination and in-situ precipitation reaction. The coordination reaction reduced the energy gaps between singlet and triplet states and stabilized the excited states of the guest molecules. Developing efficiency and long-lived room-temperature phosphorescence (RTP) materials through straightforward methods is highly desired. In this work, a stepwise stabilization strategy was proposed by the coordination and in-situ precipitation reactions among organic precursors, inorganic cation and anions, producing room-temperature phosphorescence materials with high emission efficiency (phosphorescence quantum yield of 45 %). Structural and photophysical characterizations revealed the coordination reaction reduced the energy gaps between singlet and triplet states and stabilized the excited states of the guest molecules. The in-situ precipitation reaction produced a solid matrix, which provided isolated environments for protecting the excitons from quenching. The applications of RTP materials in information encryption were demonstrated. The presented results provided a new clue for producing RTP materials, and extended their applications in wide fields.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Junwei Wang,Xuhui Wang,Dengjia Yuan,Min Xu,Ziyu Yan,Honghua Ge
The electrochemical water softening technique has the advantages of environmental friendliness, energy saving, and no secondary pollution. However, the easy scaling on the cathode surface affects its hardness removal efficiency, especially for slag-flushing water with high hardness and low alkalinity. In addition, the impact of electrochemically softened water on metal corrosion behavior is unclear and poses potential safety hazards. In this study, a novel electrochemical water softening reactor with a barrier layer structure was designed. By increasing the pH value of the water solution in the cathode region, the precipitation reaction was transferred from the cathode surface to the solution and barrier layer surfaces. The strong oxidizing substances generated by the anodic reaction were adsorbed through the barrier layer, thereby inhibiting their corrosive effect on carbon steel. Compared with the common electrochemical water softening reactor, the improved reactor has increased the pH in the cathode region from 8.58 to 12, increased the hardness removal efficiency from 5.8 % to 53.6 %, and reduced the corrosion rate of carbon steel from 0.396 mm/a to 0.254 mm/a. The significant increase in pH accelerated the rate of precipitation reactions in solution, increased the particle size of the precipitate, and caused rapid settling of the precipitate particles. The average settling rate of precipitated particles was 0.331 mg/s, much higher than the 0.017 mg/s before the improvement. Meanwhile, the strong oxidizing ions of ClO - were effectively adsorbed by the activated carbon plate, which in turn slowed down the corrosion of carbon steel by electrochemical water softening.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Kailiang Zhang,Wei Xiang,Jiuqing Liu,Zhijie Xie
Flexible droplet transportation and coalescence are significant for lots of applications such as material synthesis and analytical detection. Herein, we present an effective method for controllable droplet transportation and coalescence via thermal fields. The device used for droplet manipulation is composed of a glass substrate with indium tin oxide-made microheaers and a microchannel with two transport branches and a central chamber, and it's manipulated by sequentially powering the microheaters located at the bottom of microchannel. The fluid will be unevenly heated when the microheater is actuated, leading to the formation of thermal buoyancy convection and the decrease of interfacial tension of fluids. Subsequently, the microdroplets can be transported from the inlets of microchannel to the target position by the buoyancy flow-induced Stokes drag. And the droplet migration velocity can be flexibly adjusted by changing the voltage applied on the microheater. After being transported to the center of central chamber, the coalescence behaviors of microdroplets can be triggered if the microheater located at the bottom of central chamber is continuously actuated. The droplet coalescence is the combined effect of decreased fluid interfacial tension, the shortened droplet distance by buoyancy flow and the increased instability of droplet under the elevated temperature. The droplet coalescence efficiency is also related to the voltage of microheater, by increasing the voltage from 3.5 V to 7 V, the needed time for droplet coalescence dramatically decrease from 220s to 1.4 s. Finally, by the droplet coalescence-triggered calcium hydroxide precipitation reaction, we demonstrate the applicability of the droplet manipulation method on specific sample detection. Therefore, this approach used for droplet transportation and coalescence can be attractive for many droplet-based applications such as analytical detection.
研究领域:
微流控技术
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Shuo Li,Yingxiao Du,Xinyan Zhu,Ningning Zhao,Lei Dai,Bin Li,Zekun Zhang,Wei Meng,Jing Zhu,Ling Wang,Zhangxing He
Aqueous zinc ion batteries (AZIBs) are one of the most well-liked power source systems at present because of their low price and elevated security. However, AZIBs still face challenges such as zinc dendrite formation, hydrogen evolution, and corrosion. Therefore, this work achieves high-performance dendrite-free AZIBs (Zn@MIL-101-NH2) by constructing a highly three-dimensional porous Cr-based metal–organic framework (MIL-101-NH2) artificial interface protection layer. MIL-101 has a highly three-dimensional porous structure, and –NH2 groups are introduced. –NH2, which is hydrophilic and zincophilic, reconfigures the hydrogen-bonding network structure around the artificial interfacial layer, inhibits the occurrence of the hydrogen precipitation reaction, and induces the uniform deposition of zinc ions. According to experimental results, the Zn@MIL-101-NH2 full cell may retain up to 89.6% of its capacity after 1400 cycles at a current density of 1.0 A g−1, demonstrating excellent electrochemical performance.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2016
·Vol. 29
·期 5
·607-616
·
IF 0.496
Gong Cheng-yun,Geng Zhi-gang,Dong An-le,Ye Xin-xin,Wang Guo-zhong,Zhang Yun-xia
A facile one-step co-precipitation method was demonstrated to fabricate amorphous sulfur-containing calcium phosphate (SCP) nanoparticles, in which the sulfur group was in-situ introduced into calcium phosphate. The resulting SCP exhibited a noticeable enhanced performance for Pb(II) removal in comparison with hydroxyapatite (HAP), being capable of easily reducing 20 ppm of Pb(II) to below the acceptable standard for drinking water within less than 10 min. Remarkably, the saturated removal capacities of Pb(II) on SCP were as high as 1720.57 mg/g calculated by the Langmuir isotherm model, exceeding largely that of the previously reported absorbents. Significantly, SCP displayed highly selective removal ability toward Pb(II) ions in the presence of the competing metal ions (Ni(II), Co(II), Zn(II), and Cd(II)). Further investigations indicated that such ultra-high removal efficiency and preferable affinity of Pb(II) ions on SCP may be reasonably ascribed to the formation of rod-like hydroxypyromorphite crystals on the surface of SCP via dissolution-precipitation and ion exchange reactions, accompanied by the presence of lead sulfide precipitates. High removal efficiency, fast removal kinetics and excellent selectivity toward Pb(II) made the obtained SCP material an ideal candidate for Pb(II) ions decontamination in practical application.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2021
·
IF 17.789
Leqing Deng,Meiying Feng,Ruiting Wang,Yusi Yang,Xiaogang Niu,Juan Zhang,Lulu Tan,Jianwen Zhang,Yifan Chen,Liang Zeng,Yujie Zhu,Lin Guo
Potassium-ion batteries (KIBs) are attractive electrochemical energy storage technologies because of their low cost and high energy density . Currently, the reported cathode candidates for KIBs are all limited to the intercalation-type materials. The working principles of these materials all involve the repeated intercalation-deintercalation of bulky K-ions in the ionically-bonded rigid frameworks, which often results in sluggish reaction kinetics, irreversible structural deformation, and poor cycling stability. Here, a low-cost conversion-type material, potassium iodide (KI), is proposed as a promising cathode candidate for KIBs. It is revealed that the depotassiation-potassiation of KI proceeds via a dissolution-precipitation reaction process involving the highly soluble KI 3 intermediate, leading to the shuttle effect and capacity decay. Susequently, a simple strategy combining electrolyte modulation with separator modification is adopted to effectively enhance the electrochemical performance of KI, leading to an impressive capacity retention of 95.5% after 550 cycles. The present study may shed some light on further exploration of high-performance electrode materials based on dissolution-precipitation reaction mechanism for the emerging KIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）