SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Qifang Zheng,Liuyang Dong,Peilun Shen,Dianwen Liu
Citric acid (CA) exhibits weak inhibitory on some oxidized gangue minerals owing to its relatively few hydrophilic polar groups ( OH and COOH). This study investigate the synergistic mechanism of ferrous ions (Fe 2+ ) to enhance both the selective adsorption capacity and stability of CA. The separation of scheelite and cassiterite through a flotation process was successfully achieved using a Fe 2+ /CA mixed depressant. Micro-flotation test results revealed that with the addition of Fe 2+ /CA, 84.60 % of scheelite and 23.64 % of cassiterite were recovered in the foam concentrate, with grades of 66.26 % and 17.73 %, respectively. Fe 2+ /CA had a strong depressing effect on cassiterite, resulting in a 69.30 % decrease in its recovery and a 20.33 % decrease in its grade. This indicates the effective separation of scheelite from cassiterite. Fe 2+ /CA exhibited a high adsorption affinity for the cassiterite surface, which mainly comprised L 3– , Fe 2+ , and FeOH + components. Additionally, the FeOH + complex, formed from the pre-reaction between Fe 2+ and CA, exhibited significant chemical adsorption at the Sn active sites, thereby depressing cassiterite. The high-intensity adsorption peaks at cracks and the significant increase in the normalized intensity of FeOH + on the cassiterite surface indicated that the FeOH + complex had stronger adsorption on cassiterite and selectively depressed cassiterite. This enhanced both the selective adsorption capacity and stability of CA on the cassiterite surface. The Fe 2+ /CA mixed depressant achieved efficient flotation separation of scheelite and cassiterite.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 38
·23241-23248
·
IF 3.361
Pingping Wang,Faqin Dong,Dengliang He,Shuxin Liu,Ning Chen,Tingting Huo
The photoelectrochemical reduction of U(VI) is recognized as an economical and effective way to eliminate radioactive pollution. In this study, we construct a α-Fe2O3/TiO2 film electrode-based photoelectrochemical cell to remove U(VI) and recover uranium from aqueous solution. Citric acid and oxalic acid could act as hole scavengers, being favorable for the photocatalytic reduction of U(VI). In the presence of 0.5 mM citric acid and oxalic acid, the uranium removal capacity reached 70% and 58%, respectively, while 24% was achieved for the system in the absence of acid. The XRD, SEM, FT-IR and XPS results revealed that a proportion of U(IV) was also precipitated as surface associated metastudtite. These novel observations have significant implications for the behavior of uranium within engineered and natural environments.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Huayi Tan,Bingqiang Fan,Shili Zheng,Yang Zhang
Based on the characteristics of complexation reactions, a novel method for the recovery and separation of vanadium (V), molybdenum (Mo), and nickel (Ni) is proposed. This approach mainly utilizes oxalic acid and hexamethylenetetramine (HMT) as complexing agents to recover and separate V, Mo, and Ni from the roasting slag of the byproduct carbon black from petroleum refineries, which includes the above elements plus iron and calcium. According to the differences in the solubilities of the metallic oxalic acid complexes, V and Mo were selectively leached with efficiencies of 95.49% and 97.74%, respectively, while Ni, iron, and calcium remained in the residue. After decomplexing the V and Mo complexes in the leachate by adding sulfuric acid, the oxalic acid was recycled. Then, the solution containing V and Mo was treated with HMT, and 93.19% of the Mo was complexed and precipitated. Finally, the precipitated Mo complex was dissociated by the addition of calcium oxide to separate and recover Mo and HMT with a Mo recovery efficiency of 95.72%, and HMT was regenerated and used in the following cycles. As a result, the method proposed in this study is an efficient and sustainable way to recover and separate V, Mo, and Ni from the industrial waste of petroleum refineries.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Chao Shan,You Xu,Ming Hua,Min Gu,Zhichao Yang,Peng Wang,Zhenda Lu,Weiming Zhang,Bingcai Pan
Most heterogeneous catalysts available for catalytic ozonation are present as powders and not ideal for column operation in advanced water treatment. In this study, a mesoporous Ce-Ti-Zr ternary oxide (CTZO) millisphere of large size (0.8–1.0 mm in diameter) and high surface area (180 m 2 g −1 ) was synthesized as a highly stable catalyst to meet the hydrodynamic demand in column ozonation. The fraction of Ce(III) is much higher on the surface of CTZO (49.2%) than CeO 2 (27.5%), resulting in its high catalytic activity in ozone decomposition and mineralization of oxalic acid (OA), an ozone-refractory probe compound. The most favorable catalytic ozonation of OA was observed at pH 3.0 and the adsorption of OA by CTZO via surface complexation is a requisite step for its ozonation. The EPR analysis and radical scavenging experiment confirmed that OH was the dominating reactive species in catalytic ozonation of OA by CTZO. XPS revealed that the oxidation of OA was mediated by the Ce(III)/Ce(IV) redox cycle, which continously accepts the electron supply from OA ligand and meanwhile donates electron to activate O 3 into OH. The catalytic ozonation of OA by CTZO was enhanced in the presence of sulfate due to the generation of sulfate radical. Cyclic runs demonstrated that the CTZO millispheres exhibited high stability for sustainable catalytic ozonation of OA without noticeable release of Ce or change of Ce valence state. This study will provide new insight for the development of efficient ozonation catalysts towards practical application in advanced water treatment.
研究领域:
环境科学
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催化材料
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2023
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IF 11.1
Mingxin Li,Hongling Dai,Peng Zhan,Chaoqun Tan,Zhihui Ning,Fengping Hu,Xing Xu,Xiaoming Peng
Rapid reduction of aqueous Cr(VI) to Cr(III) with waste biomass N-doped lignin charcoals (PLCNx) as a catalyst via mediate oxalic acid (OA) for hexavalent chromium wastewater. The experiment results showed that the PLCN20 composite had the greatest capacity for removing Cr(VI), and the removal rate of Cr(VI) kept higher than 98% when the addition of 5 mM OA in the system. The bubble-shaped structures of PLCNx could act as an electron shuttle mediating the electron transfer and participate in the reduction of Cr(VI), and the N vacancies defects and graphitic N on its surface were a premise for initiating the Cr(VI) reduction process. More importantly, the formation of the Cr(VI)-OA complex facilitated electron transfer as well, which significantly enhanced Cr(VI) reduction. The combined effects of the electron-donating ability of OA and the catalysis of Cr(VI)-OA complex, lead to the enhancement of Cr(VI) reduction on the PLCNx. This work not only offers novel insights into the synthesis of a superior high-efficiency heterostructure for catalyst but also proposes one new mechanism of PLCNx activate OA enhanced catalysis capacity, which helps design and optimize the catalyst process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
BMC Nephrology
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2018
·Vol. 19
·期 1
·1-12
·
IF 2.395
Yang Huan,Male Musa,Li Yang,Wang Ning,Zhao Chenming,Jin Shan,Hu Juncheng,Chen Zhiqiang,Ye Zhangqun,Xu Hua
Background Substrate reduction therapy with analogs reduces the accumulation of substrates by inhibiting the metabolic pathways involved in their biosynthesis, providing new treatment options for patients with primary hyperoxalurias (PHs) that often progress to end-stage renal disease (ESRD). This research aims to evaluate the inhibition efficacy of Hydroxy-L-proline (HYP) analogs against calcium oxalate (CaOx) crystal formation in the Drosophila Melanogaster ( D. Melanogaster ) by comparing them with Pyridoxine (Vitamin B6). Methods Three stocks of Drosophila Melanogaster (W 118 , CG3926 RNAi, and Act5C-GAL4/CyO) were utilized. Two stocks (CG3926 RNAi and Act5C-GAL4 /CyO) were crossed to generate the Act5C > dAGXT RNAi recombinant line (F 1 generation) of D. Melanogaster which was used to compare the efficacy of Hydroxy-L-proline (HYP) analogs inhibiting CaOx crystal formation with Vitamin B 6 as the traditional therapy for primary hyperoxaluria. Results Nephrolithiasis model was successfully constructed by downregulating the function of the dAGXT gene in D. Melanogaster ( P -Value = 0.0045) . Furthermore, the efficacy of Hydroxy-L-proline (HYP) analogs against CaOx crystal formation was demonstrated in vivo using D. Melanogaster model; the results showed that these L-Proline analogs were better in inhibiting stone formation at very low concentrations than Vitamin B 6 (IC 50 = 0.6 and 1.8% for standard and dietary salt growth medium respectively) compared to N-acetyl-L-Hydroxyproline (IC 50 = 0.1% for both standard and dietary salt growth medium) and Baclofen (IC 50 = 0.06 and 0.1% for standard and dietary salt growth medium respectively). Analysis of variance (ANOVA) also showed that Hydroxy-L-proline (HYP) analogs were better alternatives for CaOx inhibition at very low concentration especially when both genetics and environmental factors are intertwined ( p < 0.0008) for the dietary salt growth medium and ( P < 0.063) for standard growth medium. Conclusion Addition of Hydroxy-L-Proline analogs to growth medium resulted in the reduction of CaOx crystals formation. These analogs show promise as potential inhibitors for oxalate reduction in Primary Hyperoxaluria.
研究领域:
药理学
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遗传学
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分子生物学
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肾病学
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产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2025
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IF 9.2
Jie Chen,Ruilan Li,Yongzhi Duan,Shuaiqi Gong,Yulin Min,Hexing Li,Penghui Shi
The cyclic regeneration of non-renewable graphite anode materials in lithium-ion batteries (LIBs) is crucial for battery recycling, aiming to reduce carbon footprints and minimize resource waste. Traditional methods often involve high energy use and significant environmental pollution. To tackle this, a green, closed-loop regeneration method using only oxalic acid was developed. This approach efficiently recovers precious metals from the anode and allows for in-situ regeneration of the spent anode, as well as the synthesis of pre-lithiation reagents. The findings indicate that lithium oxalate on the surface of pre-lithiated regenerated graphite compensates for active Li+ loss and acts as a pre-lithiation sacrificial salt during battery operation. It also decomposes to release carbon dioxide, preventing the formation of soluble lithium alkoxides and electrolyte ester exchange reactions, significantly enhancing battery performance without leaving impurities. This method allows effective lithium utilization from spent anodes and in-situ closed-loop regeneration. Under optimal conditions, the Li+ leaching rate reaches 97.64%. The electrochemical performance of the regenerated prelithiated graphite maintains a high specific capacity of 320.5 mAh·g−1 after 200 cycles, with a specific capacity retention rate of 90.4%. Environmental and economic assessment shows outstanding economic advantages of $3,259.22 and negligible environmental footprint for recycling each 1.0 ton of retired graphite. This work advances material recycling, reduces the environmental impact of waste batteries, and supports a low-carbon transition.
研究领域:
材料科学
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环境工程
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能源技术
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2019
·
IF 4.384
Yao Li,Nengwu Zhu,Xiaorong Wei,Jiaying Cui,Pingxiao Wu,Ping Li,Jinhua Wu,Yimin Lin
Recovery of rare metal indium from waste LCD screens is important since its content is about 500 times of the original ore. Oxalic acid has excellent ability to leach indium from waste LCD screens, and how to achieve reactor scale operation is critical to promote indium recovery. In this study, a temperature-controlled aciduric stirred reactor (TCASR) was constructed to investigate the effects of operational conditions on the leaching efficiency of indium at reactor scale. Results showed that complete leaching was achieved in 10 min under the conditions of 0.2 mol/L oxalic acid, 300 g/L of ITO glass powder dosage, 90℃ and 500 rpm of stirring speed. Compared with the previous study, the consumption of oxalic acid decreased 3/5, ITO glass powder dosage increased by 6 times and reaction time decreased 7/9. Meanwhile, the duration of indium ion concentration was maintained for 20 min instead of decreasing immediately after reaching the peak, which was conducive to actual application. The process kinetics model illustrated that temperature played the most important role in affecting the reaction rate. The potential reason of longer indium ion concentration maintaining duration was preliminarily speculated as a faster leaching of indium than calcium result in less coprecipitation caused by calcium oxalate. Therefore, the TCASR is applicable for leaching of indium from waste LCD screens by oxalic acid due to the higher leaching efficiency, less reagents consumption and stronger processing ability.
研究领域:
环境科学
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冶金工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Jinxin Xie,Xukai Li,Weirui Chen,Xianglin Sun,Kexin Chen,Yiming Tang,Laisheng Li
The mesoporous core-shell CeO x @SiO 2 was synthesized and characterized by XRD, pyridine-FTIR, BET, SEM, TEM and XPS. CeO x @SiO 2 was the hollow nanosphere with high surface area of 1291.4 m 2 g −1 , which benefited for mass transfer of reactants. CeO x @SiO 2 exhibited the excellent catalytic activity for oxidizing oxalic acid (OA) in O 3 /H 2 O 2 /CeO x @SiO 2 . The greatest OA mineralization (91.2%) was achieved at pH = 3.2 in O 3 /H 2 O 2 /CeO x @SiO 2 , which was 5.5 times higher than that in peroxone (O 3 /H 2 O 2 , 15.9%). Influence of pH, HSO 3 − , PO 4 3− and detection of ozone and H 2 O 2 concentration were conducted to explore the mechanism. The interface reaction played vital role for OA removal in O 3 /H 2 O 2 /CeO x @SiO 2 process. Protonated surface hydroxyl groups (Ce-OH 2 + ) was the active sites, where OA, O 3 and H 2 O 2 were chemi-absorbed. The peroxide-like species (≡(Ce(IV)-O 2 H 2 )) formed by the complex of H 2 O 2 with active sites were the important intermediates, which initiated ozone decomposition into hydroxyl radical (·OH) and led to the high OA mineralization. Moreover, Lewis acid sites and electron transfer effect of Ce(III)/Ce(IV) also accounted for the high catalytic activity of CeO x @SiO 2 . In addition, CeO x @SiO 2 maintained stable structure and catalytic activity in three cycles.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 5
·734
·
IF 2.67
Jianrui Zha,Yaoqi Gu,Shuya Wei,Huarui Han,Feng Wang,Qinglin Ma
The deposition of a calcium oxalate layer on dolomite demonstrates potential application in stone culture heritage conservation. However, due to insufficient coverage and the presence of cracks, the film’s usefulness is restricted. In this investigation, we used a simple two-step procedure to create a cohesive and uncracked film. The findings show that the protective layer provides better coverage of the dolomite surface without causing cracks and significantly improves acid resistance. Furthermore, after the simple two-step treatment, the color and adhesive strength of dolomite substrates remained nearly unchanged.Keywords:calcium oxalate;two-step deposition;stone conservation;dolomite
研究领域:
文物保护
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材料科学
✓ 已验证
DOI
高影响因子
International Journal of Pharmaceutics-X
·
2025
·
IF 6.4
Huaan Li,Bohan Lin,Shuangwu Wang,Ying Zhang,Zeming Zhou,Dingsheng Wen,Zhifeng Zhang,Xiaohua Feng,Lu Wen,Jun He,Gang Chen
Hearing loss, a global health concern, significantly impacts patients with delayed language development, impaired neurocognitive function, and severe social problems. The main cause is the cochlear hair cell damage induced by oxidative stress and inflammation from ototoxic drugs, noise exposure or diabetes. Glycyrrhizic acid (GA), derived from edible herb licorice, is widely utilized in traditional Chinese medicine and clinical treatments for liver diseases. However, its potential in preventing hearing loss remains largely unexplored. Herein, we propose GA as a novel otoprotective agent and demonstrate its capability to prevent hearing loss. Our results show that GA effectively reduces oxidative stress and inflammation induced by cisplatin, aminoglycosides, or even noise and diabetes, thereby protecting cochlear hair cells. In hearing loss models, two commonly used administration methods were compared, with tympanic injection providing better protective effects than oral administration of GA. To enhance oral bioavailability, GA is employed as both the medicine and excipient, and formulated into micelles with curcumin, another extensively used bioactive compound. Interestingly, formulation parameters such as feeding ratio and temperature have little impact on micelle size but significantly affect the drug loading efficiency. The carrier-free strategy can achieve a high drug loading capacity and significantly increase the drug concentration in blood, offering improved preventive efficacy. Notably, the micelles also exhibit protection on kidneys and liver, and do not compromise the antitumor activity of cisplatin. Therefore, GA holds promise as an otoprotective candidate, with potential clinical applications for oral prophylaxis of hearing loss using the micellar formulation.
研究领域:
药理学
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耳科学
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纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CONTROL
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2018
·
IF 3.667
Jin-Rong Bai,Kai Zhong,Yan-Ping Wu,Grosu Elena,Hong Gao
The aim of this study was to evaluate the inhibitory activity of shikimic acid (SA) against biofilm formation of Staphylococcus aureus and to explore its potential molecular mechanism. Crystal violet staining assay showed that SA clearly reduced the biomass of the biofilm at its sub-MICs. Light microscopic images and scanning electron microscope (SEM) observations suggested that SA inhibited the biofilm adhesion on glass slides and induced apparent collapse of biofilm architecture. In addition, XTT reduction assay and confocal laser scanning microscopic images illustrated that the metabolic activity and the viability of the SA-treated biofilm cells significantly decreased. Cell mobility of the SA-treated S. aureus was also inhibited. These observations suggested that SA inhibited the initial biofilm formation by interfering the metabolic activity, the cell viability, and the cell mobility of S. aureus . However, SA failed to disrupt the one-day-old mature biofilm of S. aureus even at the concentrations higher than MIC, suggesting that SA disturbed the early steps in the biofilm formation of S. aureus . qRT-PCR analyses showed that SA down-regulated the transcription of sarA , while up-regulated the transcription of agrA , which resulted in the prevention of biofilm formation. So, SA could be a potential antibiofilm agent to inhibit biofilm formation of S. aureus .
研究领域:
微生物学
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药理学
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分子生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）