Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Liangzhu Pan,Xiaoping Zhang,Songwen He,Guichang Zhang,Wei Xu
Gold is one of the most fascinating resources in the waste mobile phones’ printed circuit boards (WMPPCBs). In this study, a new process for recovering Au from WMPPCBs by the Na 2 S 2 O 8 -KI system was developed. This process comprises a two-stage leaching process to provide a separation of copper and gold from WMPPCBs. 98% Cu and 78% Fe were dissolved by the 1st base metals' leaching (H 2 SO 4 -H 2 O 2 leaching) step. The leaching of gold from the solid reside of 2nd leaching step was performed to study the effect of Na 2 S 2 O 8 concentration, KI concentration, temperature, and solid-liquid ratio in Na 2 S 2 O 8 -KI leaching system. The results showed that removing most of Cu greatly promoted the leaching efficiency of gold in Na 2 S 2 O 8 -KI leaching system. The mechanism of gold leaching was studied by the thermodynamic analysis. Leaching kinetics data showed that gold leaching followed an intermediate-controlled mechanism with E a , 30.3 kJ mol −1 . The best conditions for leaching of gold in Na 2 S 2 O 8 -KI system were determined to be 0.02 M Na 2 S 2 O 8 , 0.15 M KI, 40 ℃, a solid-liquid ratio of 1: 20 (g/mL), and a stirring speed of 200 rpm. Under the optimal leaching parameters, the efficiency of gold leaching from WMPPCBs attained 96% after 120 min. Due to the non-toxic and low-cost properties of Na 2 S 2 O 8 , the Na 2 S 2 O 8 -KI leaching process is more sustainable than conventional processes (cyanide leaching et al.).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1116
·
IF 3.9
Chaokun Yang,Xiangning Ma,Meng Li,Tuantuan Yang,Xin Zhao
Much effort has been devoted to the development of efficient heterogeneous catalysts for the conversion of carbon dioxide (CO2) into high-value chemicals. Generally, the cycloaddition of CO2to epoxides is considered a green and atom-economic reaction for the production of cyclic carbonates. Based on this, three kinds of silicon-based catalysts modified using zinc(Ⅱ) 2-bromoacetic (Si-ZnBA-n, n = 1, 2, 3) were facilely synthesized and employed for the chemical fixation of CO2to epoxides with the use of potassium iodide (KI). A series of characterization techniques were used to characterize the textual structures and physicochemical properties of Si-ZnBA-n. The synergistic effects of Zn, –NH2,–OH and the nucleophilic group guaranteed the catalytic activity of Si-ZnBA-n. Si-ZnBA-1 exhibited the best catalytic activity among Si-ZnBA-n because Si-ZnBA-1 possessed the highest Zn content. Additionally, the effects of the reaction conditions (temperature, pressure, time and catalyst loadings) were also discussed. The propylene carbonate (PC) yield could reach 97% under 130 °C, 2 MPa, for 5 h without the employment of organic solvent, and its selectivity was 99%. In addition, the recycling property of Si-ZnBA-1/KI was also investigated, and the catalytic system exhibited good cycle performance. Meanwhile, the catalyst showed outstanding versatility for CO2application to various epoxides, and a possibly synergistic reaction mechanism was proposed. Finally, a dynamic model was developed to discuss the activation energy of the CO2cycloaddition reaction over the Si-ZnBA-1 catalyst.Keywords:CO2;cyclic carbonate;epoxides;silicon-based;KI
研究领域:
化学工程
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催化科学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 21
·48723
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IF 2.188
Fangji Gan,Yuyu Xu,Huimin Yang,Zhe Ren,Haiyan Du
Solid-state polymer supercapacitors (SSP-SCs) have vast potential for future development due to their compact, safe, environment-friendly, and facile designing. Thus, prevalent researches have been explored in this area. In this article, poly(3,4-ethylenedioxythiophene) (PEDOT) SSP-SCs were assembled by using poly(3,4-ethylenedioxythiophene)/carbon paper (PEDOT/CP) as electrodes and polyvinyl alcohol/sulfuric acid/potassium iodide (PVA/H 2 SO 4 /KI) as the gel polymer electrolyte. The effect of KI content on the electrochemical performance of the SC was studied by cyclic voltammetry, galvanostatic charge–discharge measurements (GCD), and electrochemical impedance spectroscopy. The results indicated that the PEDOT SSP-SC has excellent electrochemical properties when KI doping amount was 60 wt %. The introduction of KI increased the specific capacitance due to the improved ionic conductivity and additional pseudocapacitance reaction at the electrode–electrolyte interface. The PEDOT SSP-SC showed high energy and power densities of 451.32 Wh kg −1 and 13.29 kW kg −1 , respectively, as well as a specific capacitance of 352.59 F g −1 for a discharge current of 1 mA cm −2 . In addition, after 1000 GCD cycles, the PVA/H 2 SO 4 /KI-based PEDOT SSP-SC showed capacitance retention of 74.08%. Therefore, the SC exhibits outstanding energy and power density and good cycle stability and has great potential to be used in high-energy density equipment. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48723.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 14
·1930-1938
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IF 2.378
Junyang Xiao,Mengyun Wang,Zijun Pang,Lin Dai,Jinfeng Lu,Jing Zou
Recently, increasing attention has been paid for using commercial peracetic acid (PAA) solution as an efficient disinfectant or a strong oxidant in water treatment. Simultaneous determination of PAA and hydrogen peroxide (H2O2) is vital because PAA solution is commonly available as a mixed solution containing the peroxides PAA and H2O2. In this study, a simple, rapid and reliable spectrophotometric method for the simultaneous determination of PAA and H2O2 was developed. This method was based on the rapid oxidation of excess potassium iodide by PAA and H2O2 in the presence of ammonium molybdate to yield yellow-colored triiodide ions (I3−) that could be quantitatively measured using an UV-Vis spectrophotometer. The absorption of generated I3− at 350 nm increased linearly (R2 > 0.999) with the concentrations of total peroxides and PAA in the range of 0–70 μM. The sensitivities were respectively measured to be as high as 2.596 × 104 M−1 cm−1 for total peroxides and 2.616 × 104 M−1 cm−1 for PAA, while the corresponding limits of detection were calculated to be as low as 0.19 μM and 0.18 μM. The concentration of the H2O2 coexisting in PAA solution was obtained by subtracting the concentration of PAA from the concentration of total peroxides. The concentrations of total peroxides, PAA and H2O2 in practical water samples measured with this proposed method were in good agreement with the values measured with the earlier reported spectrophotometric method using N,N-diethyl-p-phenylenediamine as the indicator. Therefore, this proposed spectrophotometric method could be considered as an alternative method for the simultaneous determination of PAA and H2O2 coexisting in PAA solution.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
You Zhang,Lei Zu,Huiqin Lian,Zhongkai Hu,Yanhua Jiang,Yang Liu,Xiaodong Wang,Xiuguo Cui
A novel supercapacitor system with an ultrahigh electrochemical performance was prepared by applying a multi-walled carbon nanotubes (MWCNTs) - polyaniline (PANI) composite electrode and a redox potassium iodide (KI) electrolyte. The composite electrode possessed a good conductivity and a consecutive 3D conductive network. The amazing electrochemical performance came from the simultaneous redox reaction in both electrode and electrolyte. The maximum discharge specific capacitance was up to 4960 F/g (0.1 A/g) when the concentration of KI electrolyte was only 0.05 M in a three-electrode system. After 1000 charge-discharge cycles, it still reached to 1550 F/g when the current density was increased to 1.5 A/g. Furthermore, the specific capacitance, energy density and power density of 726 F/g, 100.8 Wh/kg and 499.8 W/kg, respectively, were also obtained in an asymmetric two-electrode system.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 21
·3751
·
IF 5.719
Shindume Lomboleni Hamukwaya,Huiying Hao,Melvin Mununuri Mashingaidze,Tingting Zhong,Shu Tang,Jingjing Dong,Jie Xing,Hao Liu
Lead-free, bismuth-based perovskite solar cells (PSCs) are promising, non-toxic, and stable alternatives to lead-based PSCs, which are environmentally harmful and highly unstable under deprived air conditions. However, bismuth-based PSCs still suffer from low-power-conversion efficiency (PCE) due to their large bandgap and poor film morphology. Their poor film-forming ability is the greatest obstacle to Cs₃Bi₂I₉ progress in thin-film solar cell technology. This study synthesizes novel, lead-free perovskites with a small bandgap, excellent stability, and highly improved photovoltaic performance by integrating different amounts of potassium iodide (KI) into a perovskite precursor solution. KI incorporation improves the crystallinity of the perovskite, increases the grain size, and decreases the potential contact distribution, which is demonstrated by X-ray diffraction, electronic scanning microscopy, atomic force microscopy, and ultraviolet-visible spectroscopy. The Cs₃Bi₂I₉ PSC device with 2 vol. % incorporation of KI shows the highest PCE of 2.81% and Voc of 1.01 V as far as all the Bi-based cells fabricated for this study are concerned. The study demonstrates that incorporating KI in the Cs₃Bi₂I₉ perovskite layer highly stabilizes the resultant PSC device against humidity to the extent that it maintains 98% of the initial PCE after 90 days, which is suitable for solar cell applications. The devices also demonstrate greater resistance to airborne contaminants and high temperatures without encapsulation, opening up new possibilities for lead-free Cs₃Bi₂I₉ PSCs in future commercialization.Keywords:Cs3Bi2I9perovskite solar cells;KI incorporation;crystallinity;morphology;cell stability
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Qiang Wang,Han Jia,Qiuxia Wang,Jiaxin Li,Chuanqi Li,Han Sun,Ziwei Wei,Xiyang Wang,Wenxin Cao,Pan Huang
Potassium iodide (KI) is regarded as an ideal synergist for typical corrosion inhibitors . However, the synergistic effect of KI may be compromised due to its oxidation in acidic solutions. In this work, the anticorrosion performance of KI with different aging times in HCl solution and their synergistic effect with dodecyltriphenylphosphonium bromide (C 12 TPB) were evaluated via electrochemical tests and surface characterization techniques. The corrosion inhibition efficiency of KI gradually increased from 6.41 % to 38.99 % with increasing aging time to 6 h, while the synergy coefficient between KI and C 12 TPB abnormally decreased from greater than 1.0 to less than 0.4. UV–vis results and quantum chemical calculation demonstrated that the generated I 3 − during the aging process caused negative impact on the adsorption of C 12 TPB, leading to the reduced anticorrosion performance. This study provides valuable insights for the rational utilization of KI as the corrosion inhibitor and synergist.
研究领域:
材料科学
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电化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Qingshuo Li,Hao Yang,Mengqing Li,Kexin Zhao,Baogen Duan,Chen Zhang,Hongxia Wang,Congzhen Qiao,Haibo Chang,Tong Lin
The cycloaddition of CO2 with epoxide has been a promising way to fix CO2. Developing efficient, low-cost catalysts for this reaction is highly desired. In this paper, we report a novel cocatalyst system that consists of acrylamide and KI for the synthesis of propylene carbonate using CO2 and propylene oxide as starting materials. Different amides (i.e., acrylamide, benzamide, nicotinamide, acetamide, N-isopropylacrylamide, N-tert-butylacrylamide, and N,N-dimethylacrylamide) were combined with different potassium halides to investigate their catalysis capability. KI/acrylamide showed the highest efficiency, and a synergetic effect occurred between acrylamide and KI. At the KI: acrylamide ratio of 1:1 (mol/mol) and concentration of 2.5 mol% for both of them (based on PO), the reaction reached a yield of 95.3%. The catalytic system applies to the cycloaddition reaction using different epoxides. The reaction mechanism was proposed.
研究领域:
化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Man Xia,Yinlong Cheng,Liang Li,Xuefang Lu,Richeng Lin,Feng Huang
Yellow-green emitters have emerged in full-color displays, solid-state lighting, and biosensors. Currently, the solid-state yellow-green emitting materials are typically obtained through rare-earth phosphors or AlGaInN semiconductors. However, they possess an inherent radiative transition, which presents challenges in terms of color gamut and emission efficiency. Here, a centimeter-level copper-doped potassium iodide (KI/Cu) single crystal with high-efficiency yellow-green light emission was synthesized using a low-temperature water solution method. The crystal shows a broadband emission, with its center peak located at 561 nm and a large Stokes shift calculated to be approximately 200 nm. The doped copper ions introduce an isolated energy band in the electronic structure of KI, resulting in strengthened self-trapping excitons and a photoluminescence quantum yield (PLQY) of 98.98%. Based on the crystal, a white light-emitting diode with a broadband spectrum was fabricated by coupling with a UV chip, which offers new insights for yellow-green light emitting devices and their applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2013
·
IF 0.596
Liang Zhou,Yuanfeng Liu,Zhenhong He,Yanping Luo,Feng Zhou,Erlei Yu,Zhenshan Hou,Wumanjiang Eli
An efficient reaction of epoxides with carbon dioxide to generate the corresponding cyclic carbonates employing pentaerythritol/KI, does not need solvent.
研究领域:
化学
·
催化反应
✓ 已验证
DOI
高影响因子
Molecular Catalysis
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2019
·
IF 2.938
Qingshuo Li,Haibo Chang,Runming Li,Hongxia Wang,Jichun Liu,Shanhu Liu,Congzhen Qiao,Tong Lin
In this study, we have for the first time demonstrated that succinimide (SI)-KI is an efficient catalyst system to synthesize propylene carbonate (PC) from carbon dioxide (CO 2 ) and propylene oxide (PO) at a solvent-free condition. A synergistic effect was observed between SI and KI that largely increased the reaction yield. It enabled the cycloaddition reaction to take place at 70 °C under a low pressure (0.4 MPa) for only 4 h, with a PC yield as high as 97.5%. The overall condition is milder than the reaction catalyzed by most of the other KI involved co-catalyst systems reported in literatures. The excellent catalytic ability was explained by the increased KI solubility in PO due to the presence of SI and the weak acidity of NH in SI which can be enhanced by KI. A reaction mechanism was proposed based on a reaction kinetics study. SI-KI was applicable to cycloaddition of CO 2 with other epoxides. It may offer an inexpensive, environmentally-friendly route to synthesis of propylene carbonate from CO 2 .
研究领域:
化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Qingshuo Li,Mengqing Li,Xinrui Zhao,Kexin Zhao,Hongxia Wang,Congzhen Qiao,Xiaohong Li,Zhijun Zhang,Haibo Chang,Tong Lin
In this paper, we report a novel, unusual catalytic system that can efficiently catalyze the cycloaddition of CO 2 with propylene oxide to form propylene carbonate in a mild solvent-free condition based on the combination of detonation nanodiamond (DND) and potassium iodide (KI). When the reaction was carried out at 0.8 MPa pressure and 90 °C for 6 h, the reaction catalyzed by DND-KI (e.g. 1.0 mol% KI relative to propylene oxide(PO), DND: KI = 0.8:1 wt/wt) has a yield as high as 96.4%, which is much higher than that catalyzed by DND with other substances such as potassium bromide, potassium chloride, tetrabutylammonium iodide, and 1-butyl-3-methylimidazolium iodide. DND-KI also shows a higher catalytic reaction yield than the catalyst systems from other carbon nanomaterials such as graphene, carbon nanotube and nanodiamond prepared by a high-pressure high-temperature method. The DND-KI has an excellent service life. After ten cycles of reaction, it has almost no loss in catalytic activity . DND-KI is also applicable to the cycloaddition of CO 2 with other epoxides . We further show that the excellent catalysis capability of DND-KI originates from the special subsidiary functional groups (e.g. hydroxyl and carboxyl groups) that the DND possesses and a synergetic effect between those functional groups and KI during the reaction. The large specific surface area and porous structure also facilitate the reaction.
研究领域:
化学工程
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环境科学
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材料科学
✓ 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）