Journal of Sustainable Metallurgy
·
2023
·Vol. 9
·期 2
·588-598
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IF 2.4
Chai Xin,Meng Fan-Cheng,Zhang Xiang-lan,Zhang Xu-kun,Sun Linquan,Wang Lina
Owing to the high Na/V molar ratio of Na 3 VO 4 solution, traditional precipitation of vanadium will consume more H 2 SO 4 and discharge ammonia–nitrogen wastewater with more Na 2 SO 4 . In present work, a new process was proposed, in which CO 2 was employed to carbonate Na 3 VO 4 solution with simultaneous recovery of NaHCO 3 , followed by NH 4 VO 3 precipitation and solution recycling. Carbonation kinetics of Na 3 VO 4 solution under both atmospheric and high pressures were studied. Under atmospheric pressure, the solution pH first decreased rapidly, slowly, rapidly again with carbonation time, and finally stabilized at pH 7.3; the formation of CO 3 2− and its conversion to HCO 3 − mainly occurred and the CO 2 absorption rates of different vanadium concentrations were almost the same (about 0.026 mol·m −3 ·s −1 ) at pH of 9.0‒9.6. Under high pressure, the reaction rates at early stage increased with CO 2 pressure and vanadium concentration, and stirring speed had the most significant effect on reaction rate with the highest CO 2 absorption rate of 1.73 mol·m −3 ·s −1 at 550 rpm. The average CO 2 utilization efficiency was ~ 90% with NaHCO 3 precipitation of 42.3% at 70 g·L −1 V under 1 MPa of CO 2 pressure, while the average CO 2 utilization efficiency was ~ 35% under atmospheric pressure. Finally, the reaction rate equation of carbonation under high-pressure was deduced. Graphical Abstract
研究领域:
化学工程
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Shifeng Jiang,Yuande Zhang,Zhibao Li
Sodium bicarbonate (NaHCO 3 ) has been conventionally manufactured by a carbonation synthesis from the reaction of sodium carbonate (Na 2 CO 3 ) and CO 2 in a carbonation column. To enhance the quality and the production yield of NaHCO 3 , it is imperative to carefully control supersaturation in the carbonation crystallization process and make NaHCO 3 concentration of filtrate obtained from column bottom possibly least. A new method of NaHCO 3 production was proposed with help of common ion effect by adding Na 2 CO 3 as feed in filtering liquor. A cooling crystallizer was incorporated in the system after the carbonation tower to generate more NaHCO 3 . The crystallization kinetics of NaHCO 3 including nucleation and crystal growth was experimentally and theoretically investigated in a continuous mixed-suspension-mixed-product removal (MSMPR) crystallizer cooled from 353 to 308 K. The effect of Na 2 CO 3 concentration and additives on the crystallization of NaHCO 3 was studied. The growth and nucleation rate G V = 6.618 × 10 - 15 σ 0.290 , B 0 = 2.560 × 10 - 32 G V - 3.82 M T 1.11 were determined by moments analysis based on the experimental crystal size distribution (CSD) data. The kinetic parameters in two empirical equations were estimated by linear regression with the 0.290 of the relative supersaturation rate order, indicating that the meant surface integration and diffusion play an equally importance to the growth of NaHCO 3 crystal. The growth rate order of −3.82 suggested that nucleation of NaHCO 3 from the Na 2 CO 3 -rich solution in the MSMPR crystallizer was particle size-limiting.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Yajian Duan,Chaojuan Li,Yaxin Hua,Shuai Wu,Yaqing Guo,Xiaogang Zhang,Yuqi Hu,Bin Yang,Yongnian Dai,Jin Shi
A novel membrane electrolysis cell has been designed to convert CO 2 into CO in organic electrolyte, with Cl 2 produced on the anode from NaCl oxidation in aqueous solution. The obtained CO and Cl 2 can be used as the feedstock to produce phosgene. Phosgene is a widely used acylating agent in a chemical industry, which can be used as feedstock to produce numerous high-value chemicals. Through this route, CO 2 can be converted into useful chemical, with huge economic profits created in this process. Our experiment results demonstrate that CO 2 can be efficiently converted into CO in our designed electrolyzer, and NaCl can be efficiently oxidized to Cl 2 . During long-term electrolysis process, NaHCO 3 is generated and accumulated between the membrane and the cathode. This phenomenon provides clear evidence for us to better understand the mechanism of CO 2 electro-reduction in organic electrolyte.
研究领域:
化学工程
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电化学
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环境科学
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DOI
高影响因子
Energy Science & Engineering
·
2019
·Vol. 7
·期 3
·881-889
·
IF 2.893
Yanjie Zhu,Yang Yang,Xiaoguang Wang,Heng Zhong,Fangming Jin
Conversion of CO 2 into useful chemicals has been regarded as one promising method to mitigate the problem of global warming. However, developing an efficient method for CO 2 reduction with facile hydrogen source is still a great challenge. In this study, a new and straightforward method to convert NaHCO 3 , a model compound of CO 2 in basic solution, into formate with 2-pyrrolidone, a model compound of protein-containing biomass, as the reductant on a Pd/C catalyst in water was proposed. Results showed that a formate yield up to 30% from bicarbonate was successfully obtained over the Pd/C catalyst, and the Pd/C catalyst exhibited good catalytic activity and stability. Detailed studies revealed that the propanol generated from the decomposition of 2-pyrrolidone under hydrothermal conditions acted as the actual reductant and hydrogen source for the bicarbonate reduction to formate. Since 2-pyrrolidone can be readily generated from the proteins contained in biomass, the present research provides a promising technology of NaHCO 3 reduction with biomass as the hydrogen source and the renewable energy input, thus it is green, sustainable, and promising for practical application.
研究领域:
化学
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环境科学
·
可再生能源
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 4
·942
·
IF 3.1
Hao Zhang,Zhaozhou Wei,Deyuan Xiong,Yao Wu,Menglong Tong,Huiping Su,Zuoyuan Zhang,Jian Liao
Using sodium lignosulfonate as feedstock, ZnCl2and NaHCO3co-activated the hierarchical porous carbons (HPCs) were prepared by one-pot pyrolysis with different NaHCO3dosages (0–4 g) and carbonization temperatures (400–600 °C). Subsequently, phosphotungstate (HPW) was supported with the resulting biochar for the α-pinene hydration reaction to produce α-terpineol. The optimum preparation conditions were determined according to the yield of α-terpineol. The formation mechanism and physicochemical properties of HPCs were analyzed through TG, SEM, XPS, XRD, FT-IR, and N2adsorption–desorption isotherms. The results demonstrated that NaHCO3underwent a two-step reaction which liberated a substantial quantity of CO2, thereby enhancing activated carbon’s macroporous and mesoporous structures. Simultaneously, NaHCO3mitigated strong acid gas (HCl) emissions during ZnCl2activation. Compared with AC450-4:8:0 prepared by ZnCl2activation alone, the total pore volume of AC450-4:8:2 prepared by co-activation is increased from 0.595 mL/g to 0.754 mL/g and the mesopore rate from 47.7% to 77.8%, which is conducive to reducing the steric hindrance of the hydration reaction and improving the selectivity. Hydration experiments show that the selectivity of α-terpineol is 55.7% under HPW/AC450-4:8:2 catalysis, higher than 31.0% for HPW and 47.4% for HPW/AC450-4:8:0.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Xiaohui Song,Jinqiu Ma,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma,Dan Li
The solubilities, refractive indices, and pH values in the NaCl–Na2SO4–NaHCO3–H2O system at 323.15 K were determined by the isothermal solubility method. The dry-salt diagram of the system consists of three isothermal solubility curves saturated with two salts, one invariant point, and three crystallization regions of NaCl, Na2SO4, and NaHCO3. Two models were applied to predict the solubilities in the system based on the Pitzer model. Model I assumes that there is only one carbon species HCO3– in the solution. Model II supposes that there are three carbon species corresponding to HCO3–, CO32–, CO2(aq), and OH– in the solution. Both the computed solubilities with the two models were basically consistent with experimental results. The concentrations of HCO3–, CO32–, CO2(aq), and OH– were calculated by model II. The dominant form of carbon species is HCO3–, and the concentrations of CO32– and CO2(aq) in the sodium bicarbonate solution can be neglected. Model II can be used to describe the experimental pH values. The mean activity coefficients of NaCl, Na2SO4, and NaHCO3, osmotic coefficients, and water activities were also calculated with the Pitzer model.
研究领域:
物理化学
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热力学
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溶液化学
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产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2021
·
IF 4.156
Fangjia Yan,Xiaojuan Zhang,Edouard Asselin,Dongping Duan,Zhibao Li
Two interconnected reactors were used to produce high quality SrCO 3 by leaching celestite in NaHCO 3 solution at elevated temperature of 363.15 K. This new method avoids undesirable polluting by-products generated in the widely used black ash process. The precipitation kinetics of celestite (SrSO 4 ) leaching in NaHCO 3 at various temperatures was investigated with a view to industrial application. It was found that high temperature significantly enhanced the leaching conversion while initially concentrated Na 2 SO 4 in leaching solution has limited influence on the leaching reaction. The new process overcomes the key disadvantage of high energy consumption during sodium sulfate recovery that is inherent in the soda ash process. Having studied the effects of NaHCO 3 concentration and temperature on the leaching reaction, a shrinking core model was established with an apparent activation energy of E a = 86.6 kJ/Mol. The rate-determining step was the diffusion of ions through the product layer. Saleable Na 2 SO 4 products were successfully obtained via evaporative cooling crystallisation
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Qing Zhu,Yao Wang,Mufang Li,Ke Liu,Chunyan Hu,Kelu Yan,Gang Sun,Dong Wang
The heavy metal ions are harmful for both environment and human healthy, therefore it is highly demanded to remove them from environment. In this study, the crystalline nanocellulose (CNC)/ poly(vinyl alcohol-co-ethylene (PVA- co -PE) nanofibrous membrane functionalized with 1, 2, 3, 4 -butanetetracarboxylic acid (BTCA) was prepared to adsorb the heavy metal ions. To enhance the absorptivity, BTCA modified membrane was activated by NaHCO 3 . The structures of modified nanofibrous membranes were characterized by FESEM and FTIR. The modified membrane was then used to adsorb the Pb (II), and the mixture of Pb (II), Cr (VI), Mn (II) and Cu (II). The effect of pH value and initial concentration on the absorptivity of nanofibrous membrane to Pb (II) was studied and the adsorption kinetics was analysed. After NaHCO 3 activation, the modified nanofibrous membrane demonstrated excellent adsorption capacity to the single metal ions and metal ions mixture. The equilibrium adsorption could reach 471.55 mg·g −1 at 15 °C, higher than other nanofibrous membranes reported. Moreover, the modified nanofibrous membrane was found to be stable and could maintain 50% of the initial data after three times reuse. All of the results indicated the NaHCO 3 activated membrane was a good candidate for the heavy metal ions removal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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2021
·Vol. 118
·期 51
·e2115059118
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IF 11.205
Daoping He,Xiaoguang Wang,Yang Yang,Runtian He,Heng Zhong,Ye Wang,Buxing Han,Fangming Jin
Abiotic CO2 reduction on transition metal minerals has been proposed to account for the synthesis of organic compounds in alkaline hydrothermal systems, but this reaction lacks experimental support, as only short-chain hydrocarbons (
研究领域:
地球化学
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能源科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Qilu Cheng,Linna Du,Ligen Xu,Yuhua Zhao,Junwei Ma,Hui Lin
Nonylphenol (NP) toxicity limits the improvements in its algal remediation efficiency. This study comprehensively investigated the performance and mechanism of NaHCO 3 -driving effects on NP-exposed algae. The results showed that NaHCO 3 enhanced algal resistance to NP and the corresponding EC 50 values increased 1.31–4.25 times. Further, the toxicological effects of NP reduced with increasing pyrenoid volume and chlorophyll and carotenoids production, and decreasing cellular damage degree. Moreover, the concentration of extracellular polymeric substances was enhanced and more NP adsorption sites were formed. Consistently, RNA-seq demonstrated significant expression alterations in genes related to energy metabolism, cellular synthesis, photosynthesis, and carbon fixation. Besides, NP biodegradation rate was increased by 15.2 % and 11.1 % in the 1, and 4 mg/L NP treatments, respectively. Identification of degradation intermediates and their toxicity via Ecological Structure Activity Relationship program showed that NaHCO 3 accelerated sequential α-C removal from NP in algae with faster generation of less toxic metabolites, namely, 4-ethylphenol, 4-cresol and 4-hydroxybenzoic acid. This study provides new insights into the role of NaHCO 3 in toxicity alleviation and metabolism enhancement of NP in algae and can assist NP bioremediation efforts in aquatic environment.
研究领域:
环境科学
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水生毒理学
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生物修复
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分子生物学
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产品关联
DOI
PubMed
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Yiming Zhou,Mohamed Elchalakani,Peng Du,Chuanzhi Sun,Zuhua Zhang,Hao Wang
Using capsules containing repairing materials to heal concrete cracks has always been a method of great interest to achieve self-healing concrete. Breaking the capsules to release repairing materials is a challenging task. The current methods used to break capsules mainly rely on instant external forces, which implies that slowly developing cracks cannot be healed by capsules. In this paper, we present a novel photocatalytic self-healing mortar to solve this problem. To do so, NaHCO 3 , Ca(OH) 2 and citric acid are inserted into macro capsules. Then, the photocatalyst TiO 2 is added to the insoluble shells of capsules to allow them to be broken by sunlight. After shells of capsules are degraded by sunlight, NaHCO 3 , Ca(OH) 2 and citric acid react in a wet environment to generate repairing materials that fill the cracks. To support the feasibility of the idea, physical and chemical experiments and characterization studies were conducted. Two-millimetre wide mortar cracks can be healed by the substances released from the photocatalytic capsules. The results of water permeability tests show that the two photocatalytic capsules can reach 52% healing efficiency. The characterization results show that the substances filling the cracks are unreacted NaHCO 3 , Ca(OH) 2 , citric acid and insoluble products of calcium salts. Our results suggest that sunlight can be used for the self-healing of mortar.
研究领域:
土木工程
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2025
·Vol. 92
·期 1
·127-138
·
IF 2.6
Wang Wei,Li Haoxuan,Xie Yue,Zhao Yingying,Xiong Rihua
Climate change demands innovative carbon capture and utilization (CCU) strategies, yet converting captured CO 2 into high-value products while managing industrial waste remains elusive. Here, we demonstrate a single-step, energy-efficient bipolar membrane electrodialysis (BMED) system integrated with CCU, enabling the simultaneous conversion of NaCl brine and CO 2 into high-purity sodium bicarbonate (NaHCO 3 ) with unprecedented efficiency, but without requiring external alkali sources or energy-intensive thermal regeneration steps. By optimizing key parameters – such as current density and CO 2 aeration rate, and gas–liquid flow ratios – we achieved a bicarbonate concentration of 1.186 mol/L in the alkaline chamber, coupled with 57.65% carbon sequestration efficiency and an energy consumption as low as 3.1 kW·h/m³ CO 2 (or 716.9 kW·h/t NaHCO 3 ). This approach not only recovers valuable sodium resources from brine but also enhances CO 2 absorption through electrochemical mechanisms, potentially reducing global carbon emissions by up to 20% in brine-intensive industries. Our work paves the way for scalable, sustainable CCUS technologies, transforming waste streams into economic assets and advancing the fight against climate change. Integration of BMED with CO 2 sequestration for NaHCO 3 production from NaCl brine. Energy-efficient and sustainable CO 2 utilization for marketable products. Optimization of key operational parameters for improved efficiency.
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DOI
PubMed
高影响因子
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