COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Manman Liu,Chen Cheng,Luyao Wang,Zhaohui Qiu,Sheng Liu,Wei Chen,Guangyi Liu
Under the traditional sulfhydryl collector system, the flotation enrichment of sphalerite requires the addition of copper ions to pre-activate sphalerite, and the separation of sphalerite and pyrite can be realized under high alkali conditions, which is not environmentally friendly. Therefore, it is urgent to develop highly selective collectors to achieve green separation of sphalerite and pyrite without copper ion activation and under low alkali conditions. In this study, 2-dibutylamino-4(1 H)-thione-6-thiol-1,3,5-triazine (DBN) was first selected as a specific collector for flotation separation of sphalerite from pyrite, and the selective hydrophobic mechanism of DBN on sphalerite surface was emphatically investigated. UV spectra showed a selective affinity of DBN towards zine ions rather than iron ions. The results of adsorption capacity indicated that under pH 4.0 ∼ 6.0, the adsorption amount of DBN on sphalerite was much higher than that on pyrite. In-situ atomic force microscopy (AFM) images combined with Contact Angle distinctly exhibited that the self-assembly of DBN on sphalerite improved its surface hydrophobicity. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) revealed that DBN chemisorbed on sphalerite surface via bonding DBN’s exo -S atom with surface Zn atom. Due to the selective adsorption, DBN efficiently floated out sphalerite from pyrite at natural pH (∼5.9) in the absence of extra agents such as lime, activators and depressants. Therefore, DBN achieved the green separation and enrichment of sphalerite from pyrite, which offered a novel insight for developing green and efficient collectors.
研究领域:
矿物加工工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Hairong Shen,Jieyi Wang,Mengke Li,Chenquan Ni,Hui Zhong,Zhiguo He
Using peroxymonosulfate (PMS) activation system employing inexpensive solid waste-based catalysts to degrade organic pollutants is a sustainable strategy. In this study, a catalyst derived from copper tailings (CT-BA5) was developed to efficiently activate PMS for aniline aerofloat (AAF) degradation. The micromorphology of copper tailings (CT) was transformed from blocky to porous and loose after the modification, exposing more active sites for PMS activation. The degradation rate constant ( k obs ) of AAF increased to 23.4 times of CT. The degradation efficiency of AAF by CT-BA5/PMS system was 98.79 % within 10 min. The results of XPS, ESR and DFT calculations demonstrated the important roles of Ca 3 Fe 2 Si 3 O 12 and Ov as active sites in the reaction process, which enhanced the electron transfer rate and Fe(II)/Fe(III) valence cycle of the catalyst, thus promoting the generation of reactive oxygen species (ROS). 1 O 2 was the dominant ROS responsible for AAF degradation and preferentially attacked the P-N bond of AAF. Furthermore, the results of cycling experiments and actual flotation wastewater treatment showed CT-BA5 had excellent reusability and practical applicability. In conclusion, this study provides a solution for the development of solid waste-based environmental remediation materials and waste-to-energy treatment, which is expected to be widely used in practical wastewater treatment.
研究领域:
环境科学
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废弃物资源化
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Chun Bai,Kexin Li,Dezhen Fang,Xiushen Ye,Huifang Zhang,Quan Li,Jun Li,Haining Liu,Zhijian Wu
A novel flotation agent named N-octadecyl-N-methyl- D -glucamine (NO-NMDG), was designed and prepared using N-methyl- D -glucamine as a polyhydroxy molecule and 1-bromooctadecane as the provider of a long-chain alkyl group . The results of characterization by NMR, MS and FT-IR showed that the target compound was successfully synthesized. NO-NMDG can effectively separate boron from aqueous solutions because of its complexing ability for boron and its foamability. The flotation experiments results showed that the flotation isotherm was in better accordance with the Langmuir model, indicating that the surface reaction in flotation by NO-NMDG belongs to the single molecular layer trapping. The response surface experimental results indicated that under the optimum conditions, the boron recovery rate can reach to 89.12%. The boron recovery rate in Xiao Chaidan brine could reach to 97.26% by NO-NMDG. The mechanism analysis exhibited that the meglumine group in NO-NMDG can complex with boron, and the long-chain alkyl group can attach to the surface of the bubble and enter into the bubble layer to separate boron from the aqueous solution.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Chun Bai,Kexin Li,Yanping Wang,Haining Liu,Huifang Zhang,Quan Li,Jun Li,Xiushen Ye,Zhijian Wu
ABSTRACT A novel boron flotation agent (N-2-hydroxyoctadecyl-N-Methylglucamine, NHO-NMDG) was fabricated using 1,2-epoxyoctadecane and N-methyl-D-glucamine. The obtained collector possesses both collecting and foaming properties and it was characterized by nuclear magnetic resonance, mass spectrometry, Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy methods. The flotation performance for boron removal from the salt lake brine has been studied. The flotation experiments indicated a highly effective removal of boron from the salt lake brine. The boron removal rate in the Da Qaidam brine could reach 67.08% by NHO-NMDG. The mechanism analysis shows that the meglumine group in the bifunctional flotation agent can be complexed with boron, and the long-chain alkyl group can attach to the surface of the bubble and enter into the bubble layer, so as to separate boron from the aqueous solution.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2024
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IF 5.2
Weiwei Wang,Zhengyao Li,Erdou Li,Weiyao Zhu,Shaochun Hou,Yuanyuan Wang
Heavy rare earth elements (HREEs) have extensive applications in critical industries. Xenotime (YPO 4 ) is an important phosphatic mineral rich in HREEs. The application of 2-hydroxy-3-naphthyl hydroxamic acid (NHA) as a collector in the flotation of xenotime has rarely been been explored previously. This study reveals the effect of NHA on the flotation behavior and adsorption mechanism of xenotime. The high-grade rare earth concentrate with significant recovery is achieved at the optimized flotation conditions. Techniques such as Fourier transform-infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), and first-principles calculations were employed to clarify the adsorption mechanism of NHA on xenotime. These studies disclose that chemical adsorption occurs through the interaction between N-bonded and carbonyl O atoms, creating a bidentate bond with an Y 3+ ion on the xenotime surface. These findings underscore the potential of NHA for selective flotation of xenotime, providing valuable insight into xenotime processing.
研究领域:
矿物加工工程
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材料科学与工程
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理论化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Anruo Luo,Jianhua Chen,Yibing Zhang,Huimin Chen,Zerui Liu
Flotation is a technique for mineral separation based on differences in surface hydrophobicity, processing around 10 billion tons of minerals globally each year. Flotation reagents are central to mineral flotation technology. The functional group structures of organic flotation reagents primarily consist of four ligand atoms: N, O, P, and S. After extensive development over centuries, the combinations of these atoms have been fully explored, leading to a bottleneck in new flotation reagent structures, with few novel formulations reported. This study is the first to identify selenium (Se) as a viable ligand in flotation reagents. We utilized contact angle measurements, SEM, FT-IR, Raman spectroscopy, TOF-SIMS, XPS, and DFT simulations to examine the interactions between six selenium-based organic compounds and chalcopyrite surfaces, confirming that Se can coordinate with Cu + ions. Actual ore flotation experiments demonstrated that benzeneselenol and dibenzyl diselenide achieved superior flotation performance at lower dosages compared to the traditional collector IPETC for copper sulfide ores. This research addresses the limitations of conventional ligand atoms in flotation reagents by introducing Se, expanding potential functional group structures. This advancement provides more opportunities for designing efficient and environmentally friendly flotation agents and introduces novel concepts for using selenium-based organic compounds as metal complexes.
研究领域:
矿物加工工程
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表面化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Pan Xiao,Jingjing Xiao,Zhihong Xiao,Rukuan Liu,Zhiyong Zhang,Chuansheng Chen,Changzhu Li
Herein, a novel surfactant dihexyl (2-amino-2-(hydroxyimino)ethyl) phosphonate (DHAHEP) was synthesized by combining phosphonate and amidoxime groups in the same molecule, and used as a flotation collector for quartz vein-type wolframite. The Micro-flotation results showed that DHAHEP has excellent collection performance for wolframite, at pH 2 ∼ 4.5, the flotation recovery of DHAHEP for wolframite was over 90 %, while that for quartz was less than 60 %. The wolframite-quartz artificial mixed ores experiments demonstrated that at pH ∼ 4 and DHAHEP concentration of 8 × 10 -5 mol·L -1 , the flotation recovery of wolframite was 64.5 % and the grade was 48.9 %. Zeta potential and contact angle experiments elucidated that DHAHEP anchored on the wolframite surface mainly in the form of cations, increasing the hydrophobicity of the surface and thus separating the wolframite from quartz by flotation. FTIR, XPS, and DFT calculation further revealed that DHAHEP had an obvious flotation separation effect on quartz vein-type wolframite, it was mainly electrostatically adsorbed on the WO 4 2- sites of the wolframite surface in the form of cations, and also captured wolframite by forming chemical bonds with the Fe active sites through the phosphoryl and amidoxime groups in its molecular structure.
研究领域:
矿物加工工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Zhihui Chen,Jun Yao,Tatjana Šolević Knudsen,Bo Ma,Bang Liu,Hao Li,Xiaozhe Zhu,Chenchen Zhao,Wancheng Pang,Ying Cao
The environmental impact of the mining industry requires efficient and eco-friendly technologies to mitigate the presence of mineral flotation reagents (MFRs) in mineral processing wastewater (MPW) prior to their discharge into the environment. In this work, for the first time, a robust, easily separable and reusable biocatalyst, Fe 3 O 4 @SiO 2 -NH 2 -Lac, was used for the degradation of a novel mineral flotation reagent 8-hydroxyquinoline (8-HQ). Under optimized conditions, Fe 3 O 4 @SiO 2 -NH 2 -Lac achieved 89.2% 8-HQ degradation efficiency within 6 h. The effect of the main constituents of MPW on 8-HQ degradation, including metal ions, organic solvents, surfactant, metal chelator and flotation frother was evaluated. The Fe 3 O 4 @SiO 2 -NH 2 -Lac also displayed favorable degradation efficiency of 8-HQ in real lead–zinc mine water. The biocatalyst could be easily recovered and had a satisfactory reusability, retaining 64.5% of 8-HQ degradation efficiency in the sixth reaction cycle. Identification of intermediate products revealed that Fe 3 O 4 @SiO 2 -NH 2 -Lac mediated reaction predominantly generated various structural 8-HQ oligomers/polymers. A potential degradation pathway for 8-HQ was speculated as follows: Fe 3 O 4 @SiO 2 -NH 2 -Lac initially catalyzed the oxidation of 8-HQ to yield the corresponding reactive radical intermediates, which subsequently undergone self-coupling reaction via C − C and C − O − C covalent coupling at their ortho and/or para positions, finally forming oligomers and polymers. The inhibition assays of marine bacterium ( Vibrio fischeri ) demonstrated that the toxicity of 8-HQ and its intermediate products was effectively reduced after Fe 3 O 4 @SiO 2 -NH 2 -Lac treatment. The results of this study might present an alternative immobilized laccase-based clean biotechnology for the clean-up and detoxification of 8-HQ contaminated MPW.
研究领域:
环境科学
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生物技术
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Wen-Jun Wu,Qing-Jun Zheng,Jing-Wen Liang,Hai-Ming Zhao,Bai-Lin Liu,Yan-Wen Li,Nai-Xian Feng,Quan-Ying Cai,Lei Xiang,Ce-Hui Mo,Qing X. Li
Xanthates , common mining flotation reagents, strongly bind thiophilic metals such as copper (Cu), lead (Pb), cadmium (Cd), and zinc (Zn) and consequentially change their bioavailability and mobility upon their discharge into the environment. However, accurate quantification of the metal-xanthate complexes has remained elusive. This study develops a novel and robust method that realizes the accurate quantification of the metal-xanthate complexes resulted from single and multiple reactions of three typical xanthates (ethyl, isopropyl, and butyl xanthates) and four thiophilic metals (Cu, Pb, Cd, and Zn) in water samples. This method uses sulfur (S 2- ) dissociation, followed by tandem solid phase extraction of C 18 + PWAX and subsequent LC-MS/MS analysis. It has a wide linearity range (1–1000 μg/L, R 2 ≥ 0.995), low method detection limits (0.002–0.036 μg/L), and good recoveries (70.6–107.0 %) at 0.01–10 mg/L of xanthates. Applications of this method showed ubiquitous occurrence of the metal-xanthate complexes as the primary species in flotation wastewaters, which the concentrations were 4.6–28.9-fold higher than those previously determined. It is the first quantitative method established for the analysis of metal-xanthate complexes in water samples, which is of great importance to comprehensively understand the fate and risks of xanthates in the environment.
研究领域:
环境化学
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分析化学
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采矿工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Jiacheng Sun,Bo Yan,Hongxing Chen,Shuchen Tu,Junhao Zhang,Tao Chen,Qinzi Huang,Yuting Zhang,Lingtian Xie
Currently, risk assessment and pollution management in mines primarily focus on toxic metals, with the flotation agents being overlooked. However, the combined effects of metals and flotation agents in mines remain largely unknown. Therefore, this study aimed to evaluate the combined effects of Cd and two organic flotation agents (ethyl xanthate (EX) and diethyldithiocarbamate (DDTC)), and the associated mechanisms. The results showed that Cd + EX and Cd + DDTC exhibited synergistic toxicity. The EC 50 values for luminescent bacteria were 1.6 mg/L and 1.0 mg/L at toxicity unit ratios of 0.3 and 1, respectively. The synergistic effects were closely related with the formation of Cd(EX) 2 and Cd(DDTC) 2 micro/nano particles, with nano-particles exhibiting higher toxicity. We observed severe cell membrane damage and cell shrinkage of the luminescent bacteria, which were probably caused by secondary harm to cells through the released CS 2 during their decomposition inside cells. In addition, these particles induced toxicity by altering cellular levels of biochemical markers and the transcriptional levels of transport proteins and lipoproteins, leading to cell membrane impairment and DNA damage. This study has demonstrated that particulates formed by Cd and flotation agents contribute to the majority of the toxicity of the binary mixture. This study helps to better understand the complex ecological risk of inorganic metals and organic flotation agents in realistic mining environments.
研究领域:
环境科学
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毒理学
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矿物加工
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生态毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）