MOLECULES
·
2024
·Vol. 29
·期 16
·3846
·
IF 4.2
Lei Huang,Jian Qian,Shijian Sun,Zheng Li,Dechuan Li
A novel method for synthesizing dumbbell-shaped (Gd1−xTbx)2O(CO3)2·H2O (GOC:xTb3+) phosphors using sodium carbonate was investigated. An amount of 1 mmol of stable fluorescent powder can be widely prepared using 3–11 mmol of Na2CO3at a pH value of 8.5–10.5 in the reaction solution. The optimal reaction conditions for the phosphors were determined to be 7 mmol for the amount of sodium carbonate and a pH of 9.5 in the solution. Mapping analysis of the elements confirmed uniform distribution of Gd3+and Tb3+elements in GOC:xTb3+. The analysis of fluorescence intensity shows that an optimal excitation wavelength of 273 nm is observed when the concentration of Tb3+is between 0.005 and 0.3. The highest emission intensity was observed for GOC:0.05Tb3+with a 57.5% maximum quantum efficiency. The chromaticity coordinates show that the color of GOC:Tb3+is stable and suitable for fluorescence recognition. Latent fingerprint visualization reveals distinctive features like whorls, hooks, and bifurcations. Therefore, the sodium carbonate method offers an effective alternative to traditional urea chemical reaction conditions for preparing GOC:Tb3+.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Yuanlin Chen,Guangsheng Huo,Xueyi Guo,Qinmeng Wang
Acid digestion of tungsten concentrates has attracted more and more attention in recent years, sustainable extraction of tungsten from acid digestion product of tungsten concentrates to obtain (NH 4 ) 2 WO 4 solution with low impurity content is the key for ammonium paratungstate production. In this work, a process of extracting tungsten from acid digestion product by leaching-solvent extraction together with raffinate circulation was introduced. The acid digestion product was firstly leached by Na 2 CO 3 , and the leaching efficiency was 99.47% with circulation of Na 2 CO 3 solution converted from the raffinate of solvent extraction . The tungsten in pure Na 2 WO 4 solution with 121.26 g/L WO 3 could be almost completely extracted by solvents containing 15% N235 or 15% Alamine 308 in one stage. The extraction mechanism of N235 and Alamine 308 was the same, while Alamine 308 showed better performance and higher saturated loading capacities for tungsten extraction. The loaded tungsten was stripped from organic phases using NH 3 ·H 2 O with stripping efficiency of 99.98%, obtaining (NH 4 ) 2 WO 4 solutions with WO 3 concentration above 260 g/L and low impurity content. The raffinate containing high Na 2 SO 4 concentration was converted to Na 2 CO 3 solution by adding BaCO 3 and recycled for the leaching of digestion product, which could significantly reduce the discharge of sodium salt wastewater. The presented work provides a cleaner production route for preparing pure (NH 4 ) 2 WO 4 solution from acid digestion product of tungsten concentrates.
研究领域:
冶金工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Wenbo Li,Runnan Guo,Yanjun Li,Zhenhai Dong
In this study, we developed a new method for the efficient extraction and separation of V from direct acid leaching solutions of weathered crust V Ti magnetite using N235/TBP, sodium sulfate (Na 2 SO 4 ), and sodium carbonate (Na 2 CO 3 ) as the extraction system and washing and stripping agents, respectively. The effects of various experimental conditions on the extraction results were investigated, and the extraction efficiency of V was approximately 70% with <4% Fe co-extraction under optimal conditions. A four-stage countercurrent extraction method was used to extract >96% of V and <4.5% of Fe, and the separation factor of V/Fe was 541. Upon washing the V-loaded organic phase with a 0.70 mol/L Na 2 SO 4 solution, >96% of Fe and ~1% of V were removed. Moreover, upon stripping the purified organic phase with a 0.70 mol/L Na 2 CO 3 solution, >98% of V was recovered. The effects of other impurities on the separation of V were negligible. Moreover, the stripped organic phase can be recycled sustainably during extraction. In this study, we selectively separated V and provided a new method for accelerating the purification and enrichment of V, which is present at low concentrations in acid leaching solutions.
研究领域:
冶金学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Qiuping Li,Shaopeng Gu,Liang Yu,Funian Han,Jingmeng Dong,Chunmei Li,Jiaqi Jia
An effective and environment-friendly method for preparing NaVO 2 , which can be used as an energy storage material, from Na 2 CO 3 roasted vanadium-chromium slag was proposed using water as the leaching medium. Vanadium-chromium slag with 30 % Na 2 CO 3 was heated in air and argon atmospheres from 30 °C to 1000 °C, respectively. The results show that vanadium compounds converted to NaVO 3 while chromium compounds to Na 2 CrO 4 under air. NaVO 3 and Na 2 CrO 4 were water-soluble making the separation of vanadium and chromium complicated. NaVO 3 and Na 2 CrO 4 were water-soluble making the separation of vanadium and chromium complicated. Heating vanadium-chromium slag in an argon atmosphere caused Fe 2 VO 4 to react with Na 2 CO 3 , forming NaVO 2 and NaFeO 2 below 1000 °C. However, chromium compounds unreacted in argon. NaFeO 2 was insoluble, while NaVO 2 was water-soluble with a leaching efficiency exceeding 70 %. Notably, the characteristic peak of V(III) in NaVO 2 was first found to be −532.00 ppm by the liquid 51 V NMR spectrum. This method represents a novel, green strategy for the resource utilization of vanadium-chromium slag, involving Na 2 CO 3 roasting in an argon atmosphere to produce NaVO 2 . It offers a promising approach to reduce the cost of NaVO 2 battery production and support its commercialization.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chen Li,Wei Liu,Fen Jiao,Congren Yang,Gonghao Li,Shiyang Liu,Wenqing Qin
Electric arc furnace dust (EAFD), an important secondary resource, is categorized as hazardous solid waste which contains multiple heavy metals such as zinc, lead and chromium. Smelting-Reduction is considered as an effective method to recover metal elements from EAFD. To efficiently separate the zinc, lead, iron and slag from EAFD, a novel and clean process developed to enhance reduction and lower smelting temperature through sodium carbonate was proposed herein. Thermodynamic analysis and laboratory experiments were carried out to determine the feasibility and reliability of this new process. The optimal conditions were determined as temperature of 1450 °C, sodium carbonate dosage of 4%, C/O of 0.8, holding time of 30 min and basicity of 0.8, and the corresponding volatilization of Zn and Pb could be 99.78% and 89.47% respectively; besides, the reduction of iron could reach 98.98%. Simultaneously, the recovery of iron reached 98.62% and the grade of iron amounted to 93.8%. The melting reduction process of zinc, lead and iron could be divided into three stages according to both the experimental results and the thermodynamic analysis. The short process which is characteristic of high efficiency and low energy consumption, aims to provide a clean and sustainable approach to utilize EAFD.
研究领域:
冶金工程
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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
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jinghui Wang,Chengyu Wang,Yuhang Zhang,Zhijun Luo,Lingling Qu
A heat-activated sodium percarbonate and persulfate (heat-SPC-PS) system was employed to treat Cu(II)-EDTA wastewater effectively. In this binary-oxidant system, SPC functioned as an oxidant, precipitant, and neutralizer throughout the treatment process. Under optimized conditions (SPC dosage: 28.3 mM, PS dosage: 47.0 mM, temperature: 80 °C), the system achieved a Cu removal efficiency of 95.9 % and rate constant of 0.391 min −1 after 10 minutes of treating a 3.14 mM of Cu(II)-EDTA solution. The Cu ions released from Cu(II)-EDTA were precipitated as a mixture of CuO, CuCO₃, and Cu₂(OH)₂CO₃. Additionally, SPC neutralized the H⁺ ions generated from PS hydrolysis, yielding a final solution pH of approximately 7.86. When followed by an alkali precipitation (AP) step at pH 11, the combined heat-SPC-PS + AP process further increased Cu removal efficiency from 95.9 % to 98.4 %, with precipitation occurring as CuO. Reactive oxygen species (ROS) generated by heat-SPC-PS system, including OH • , SO 4 •- , O 2 •- , and 1 O 2 were key contributors to the decomplexation of Cu(II)-EDTA. Moreover, the treatment substantially reduced phytotoxicity of Cu(II)-EDTA solutions. Lettuce grown with the treated effluent exhibited growth indices comparable to those irrigated with deionized water, demonstrating the potential of the heat-SPC-PS system for the safe and effective treatment of heavy metal complexes in wastewater.
研究领域:
环境科学
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化学工程
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Ruonan Zhu,Ming Yang,Jie Yin,Zheng Wu,Meiru Li,Lihong Zhao,Xingjie Wang,Junli Ren
In order to enhance enzymolysis saccharify, the impact of pretreating wheat straw with sodium carbonate (Na 2 CO 3 ) at moderate temperatures was investigated. The effects of pretreatment condition, for instance, reaction time (10–120 min) and temperature (75–105 °C) were investigated on delignification and polysaccharides (cellulose and hemicellulose) protection. It was found that the wheat straw effectively achieved the recovery of 82.67 %, 89.70 %, and 71.11 % for total sugar, cellulose, and hemicellulose respectively, and removed of 54.96 % lignin after pretreatment at the temperature of 90 °C with 4 % (w/v) Na 2 CO 3 for 120 min. After a 20 FPU enzymes saccharification for 72 h, the highest enzymatic digestibility of cellulose and xylan for pretreated residues were 81.8 % and 82.4 %, significantly higher than that of the raw material (16.48 % cellulose enzymatic digestibility, 8.43 % xylan enzymatic digestibility). The enzymatic hydrolysis results also demonstrated that the removal and polydispersity of lignin affected the conversion efficiency of the raw material, and delignification degree was positively correlated to enzymatic hydrolysis efficiency within a certain range. This pretreatment has potential for C6 and C5 sugars co-fermentation of wheat straw for biorefinery.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Zhouwei Miao,Xiaogang Gu,Shuguang Lu,Dionysios D. Dionysiou,Souhail R. Al-Abed,Xueke Zang,Xiaoliang Wu,Zhaofu Qiu,Qian Sui,Muhammad Danish
The performance of chelated Fe(II)-based catalyzed sodium percarbonate (SPC) stimulating the degradation of perchloroethylene (PCE) in aqueous solution was investigated using six different chelating agents (CA), namely, citric acid monohydrate (CIT), oxalic acid (OA), l -ascorbic acid (ASC), ethylenediaminetetraacetic acid (EDTA), trisodium citrate 2-hydrate (CIT-Na 3 ), and EDTA-Na 2 , at CA/Fe(II)/SPC/PCE molar ratios of 2/4/4/1, 4/4/4/1 and 8/4/4/1. The results indicated that the addition of CIT and OA significantly enhanced the PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by HO radical oxidation in Fe(II)/SPC, CIT/Fe(II)/SPC, and OA/Fe(II)/SPC systems and O 2 − also participated in the degradation of PCE in CIT/Fe(II)/SPC and OA/Fe(II)/SPC systems. The intensity of HO detected by electron paramagnetic resonance (EPR) in CIT/Fe(II)/SPC and OA/Fe(II)/SPC systems indicated that the addition of CIT or OA indeed enhanced the continuous production of HO and enabled the intensity of HO to be more stable. The results demonstrated that CIT and OA significantly improved the PCE degradation efficiency by increasing the concentration of Fe(II) and maintaining the concentration of HO radicals in solution. In conclusion, chelated Fe(II)-based catalyzed SPC oxidation process shows enormous practical prospects for the remediation of PCE-contaminated groundwater because of the effectiveness without pre-adjusting the solution pH and complete mineralization in Fe(II)/SPC, CIT/Fe(II)/SPC and OA/Fe(II)/SPC systems.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2018
·
IF 2.707
Yubiao Li,Zhiming Li,Bing Wang,Zhaomin Dong,Shaoxian Song
The mechanical activation was applied as a pre-treatment method to improve molybdenite (MoS 2 ) leaching . The effects of grinding ball size, ball to powder mass ratio, milling speed and time, molar ratio of mineral to oxidants, as well as the influence of solution pH, temperature and leaching time were investigated in detail. The results showed an extremely low Mo extraction (less than 2% at acidic and neutral conditions) for MoS 2 activated alone. However, Mo extraction was increased significantly after co-grinding of MoS 2 with NaClO 2 and Na 2 CO 3 , e.g ., more than 58% in any leaching solution applied. Prolonging the grinding time improved Mo extraction but the efficiency was declined gradually, giving rise to an optimum grinding efficiency at 4 h with a molar ratio of 1:3:5 for MoS 2 :NaClO 2 :Na 2 CO 3 . Distilled water was selected as the leaching solution since this gave similar Mo recovery to other lixiviants. Higher temperature and longer leaching time were beneficial to Mo extraction. However, it was also found that too large grinding balls and high ball to powder mass ratio adversely affected MoS 2 extraction. The kinetics analysis indicated that the leaching of activated MoS 2 followed a chemical reaction controlled mechanism. The XRD and SEM analyses indicated that mechanical activation not only reduced the particle size of MoS 2 but also triggered solid state reaction to produce soluble Na 2 MoO 4 , thereby improving Mo extraction significantly.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 16
·15733-15742
·
IF 2.8
Fu Xiaori,Dionysiou Dionysios D.,Brusseau Mark L.,Zaman Waqas Qamar,Zang Xueke,Lu Shuguang,Qiu Zhaofu,Sui Qian
This study presents a performance comparison of Fe(II)-catalyzed sodium percarbonate (SPC), Fe(II)-EDDS-catalyzed SPC, and of the innovative hydroxylamine hydrochloride (HA)-Fe(II)-EDDS-catalyzed SPC for the degradation of trichloroethylene (TCE) in water. TCE degradation was greater in the Fe(II)-EDDS-catalyzed SPC system compared to the Fe(II)-catalyzed SPC system, indicating the effectiveness of adding EDDS as an enhancement factor for the removal of TCE. Moreover, TCE degradation was faster in the HA-Fe(II)-EDDS-catalyzed SPC system compared to the Fe(II)-EDDS-catalyzed SPC system, illustrating that HA can play a synergistic role in TCE degradation. Analysis of iron distribution in the three systems demonstrated that EDDS addition maintained iron in soluble form, and that the generation of soluble ferrous from ferric iron was expedited with addition of HA. Studies using nitrobenzene and carbon tetrachloride probes provided insights on the generation of hydroxyl radical (HO • ) and superoxide anion radical (O 2 •− ) in the three systems. A gradual increasing contribution of O 2 •− to TCE removal in Fe(II)-catalyzed SPC, Fe(II)-EDDS-catalyzed SPC, and HA-Fe(II)-EDDS-catalyzed SPC systems was verified through free-radical scavenger tests. Finally, monitoring of Cl − concentrations manifested the complete dechlorination of TCE. A possible mechanism of TCE degradation involving two pathways of HO • oxidation and O 2 •− reaction was proposed.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2019
·
IF 5.839
Suchen Liu,Liuming Xie,Mingyue Shen,Yuehuan Xiao,Qiang Yu,Yi Chen,Jianhua Xie
The effects of dual modifications on the gelatinization, textural, and morphology properties of pea starch by Na 2 CO 3 and Mesona chinensis polysaccharide (MCP) were investigated. Results showed that Na 2 CO 3 promoted granular swelling and disruption but decreased the rearrangement tendency of disordered starch fraction of PS during gelatinization. The addition of 0.05%–0.1% MCP slightly affected granular swelling and protected the integrity of starch granules of Na 2 CO 3 –PS. 0.2% MCP enhanced the retrogradation and recrystallization of gelatinized starch in the presence of Na 2 CO 3 . Near-UV circular dichroism spectra showed that adding Na 2 CO 3 and MCP in PS resulted in a strong peak at 285 nm and a small trough at 310 nm in the spectra of MCP and PS. The peak intensity orders of samples were consistent with the reaggregation tendency, suggesting that the characteristic peak at 285 nm was closely related to the retrogradation degree of starch.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
高影响因子
Environmental Technology & Innovation
·
2025
·
IF 7.1
Yanyan Liu,Bangxiao Zheng,Min Zhao,Feng Zheng,Xiaoqing Chen,Lei Wang
The effectiveness of ultraviolet advanced oxidation processes (UV-AOPs) was influenced by the prevalence of dissolved organic matter (DOM) in natural water bodies. This study investigated the impact of humic acid (HA), fulvic acid (FA), and extracellular organic matter (EOM) on the degradation of Ciprofloxacin (CIP) by UV 222 /Sodium Percarbonate (UV 222 /SPC) and UV 222 . The results demonstrated that all three types of DOMs suppressed CIP degradation in UV 222 /SPC, with EOM exhibiting stronger inhibitory effects than HA and FA. This suppression primarily arose from DOM's light-shielding properties and scavenging of hydroxyl radicals (•OH) and carbonate radicals (CO₃•⁻), which outweighed the compensatory effects of DOM-photosensitized reactive species. In contrast, EOM enhanced direct UV 222 photolysis of CIP due to its high absorption coefficient at 222 nm, which promoted the generation of excited triplet state EOM ( 3 EOM ⁎ ) and singlet oxygen ( 1 O 2 ) via photosensitization. These reactive species compensated for EOM’s light-shielding effect, enabling efficient indirect photodegradation of CIP. The organic matter in EOM rather than NO 3 - promoted the degradation of CIP in UV 222 . The fluorescence spectra and dissolved organic carbon (DOC) changes of DOM were analyzed in depth. In addition, both CO₃•⁻ and •OH contribute to CIP degradation in UV 222 /SPC, with the second-order rate constant of CO₃•⁻ with CIP measured at 4.79 × 10⁸ M⁻¹ s⁻¹. UV 222 /SPC showed lower energy consumption than UV 254 /SPC in treating the real water sample. This study deepens the understanding of the impact of DOM in UV 222 water purification.
研究领域:
环境科学
·
水处理工程
✓ 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）