12 results on '"Huang, Zhiqiang"'
Search Results
2. Investigations on reverse cationic flotation of iron ore by using a Gemini surfactant: Ethane-1,2-bis(dimethyl-dodecyl-ammonium bromide)
- Author
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Hong Zhong, Wenbo Zou, Liuyin Xia, Huang Zhiqiang, Shuai Wang, and Guangyi Liu
- Subjects
Ammonium bromide ,Chemistry ,General Chemical Engineering ,Inorganic chemistry ,Cationic polymerization ,General Chemistry ,Industrial and Manufacturing Engineering ,chemistry.chemical_compound ,Adsorption ,Pulmonary surfactant ,Bromide ,Zeta potential ,Environmental Chemistry ,Quartz ,Magnetite - Abstract
In this paper, a Gemini surfactant, ethane-1,2-bis(dimethyl-dodecyl-ammonium bromide) (EBAB), was introduced as a collector for reverse cationic flotation separation of quartz from magnetite, and its adsorption mechanisms on the two minerals and air/water interface were also investigated by FTIR spectra, zeta potential, density functional theory (DFT) calculation and surface tension. The flotation results showed that EBAB presented stronger collecting power than the conventional monomeric surfactant dodecylammonium chloride (DAC) and superior selectivity for quartz against magnetite. The results of FTIR spectra and zeta potential measurements demonstrated that the interaction of EBAB with quartz and magnetite was mainly through electrostatic attraction, which was further confirmed by DFT calculation. EBAB was preferred to adsorb on the negatively charged surface of quartz, increasing its zeta potentials and improving its hydrophobicity. Adsorption of EBAB at the quartz/water interface could be divided into four stages as the concentration of EBAB was increased in solution. At low concentrations, adsorption was controlled primarily by electrostatic interactions, but when the zeta potential of quartz was reversed from negative to positive, hydrophobic chain interactions controlled the adsorption process. EBAB’s unique properties, such as high positive grouping Mulliken charge of –CH2N+(CH3)2(CH2)2(CH3)2N+CH2–, and strong “surface activity” at the air–water interface, made it be a superior cationic collector for reverse flotation desilication from iron ores.
- Published
- 2014
3. Comparative studies on flotation of aluminosilicate minerals with Gemini cationic surfactants BDDA and EDDA
- Author
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Shuai Wang, Guangyi Liu, Hong Zhong, Huang Zhiqiang, and Liuyin Xia
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Chemistry ,Hydrogen bond ,Inorganic chemistry ,Metals and Alloys ,Cationic polymerization ,Geotechnical Engineering and Engineering Geology ,Condensed Matter Physics ,chemistry.chemical_compound ,Adsorption ,Aluminosilicate ,Bromide ,Silicate minerals ,Materials Chemistry ,Zeta potential ,Kaolinite - Abstract
Gemini quaternary ammonium salt surfactants, butane- α, ω -bis(dimethyl dodeculammonium bromide) (BDDA) and ethane- α, β -bis(dimethyl dodeculammonium bromide) (EDDA) were adopted to comparatively study the flotation behaviors of kaolinite, pyrophyllite and illite. It was found that three silicate minerals all exhibited good floatability with Gemini cationic surfactants as collectors over a wide pH range, while BDDA showed a stronger collecting power than EDDA. FTIR spectra and zeta potential analysis indicated that the mechanism of adsorption of Gemini collector molecules on three silicate minerals surfaces was almost identical for the electronic attraction and hydrogen bonds effect. The theoretically obtained results of density functional theory (DFT) at B3LYP/6-31G (d) level demonstrated the stronger collecting power of BDDA presented in the floatation test and zeta potential measurement.
- Published
- 2013
4. Flotation separation of the aluminosilicates from diaspore by a Gemini cationic collector
- Author
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Huang Zhiqiang, Hong Zhong, Qing-wei Chang, Liuyin Xia, and Guangyi Liu
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Chemistry ,Mineralogy ,engineering.material ,Diaspore ,Geotechnical Engineering and Engineering Geology ,Bauxite ,Adsorption ,Chemical engineering ,Pulmonary surfactant ,Geochemistry and Petrology ,Aluminosilicate ,visual_art ,Illite ,engineering ,visual_art.visual_art_medium ,Kaolinite ,Pyrophyllite - Abstract
The first use of a Gemini cationic surfactant, butane-α,ω-bis(dimethyl dodeculammonium bromide) (BDDA), as a collector for reverse flotation to separate illite, pyrophyllite and kaolinite from diaspore is reported in this study. Micro-flotation tests of the pure minerals are employed to detect the minerals' flotation behaviors with the Gemini and to comparatively investigate the collecting ability both with the dimeric surfactant and the corresponding monomeric. The results show that the Gemini surfactant demonstrates a stronger collecting power than the monomer. Moreover, with the Gemini, the floatability of kaolinite is better than that of illite and pyrophyllite in the entire pH range. When corn starch was used as a depressant, flotation separation of the artificial mixed-mineral samples and the bauxite ore were conducted by using BDDA as a collector at pH around 9–10. The Gemini presents a significant selectivity for illite, pyrophyllite and kaolinite against diaspore. Mass ratio of Al to Si of the concentrate was 9.72 for the bench-scale separation, and the recovery of Al was 81.25%. To understand mechanisms of the Gemini adsorption on the mineral surfaces, we employed FTIR spectra analysis, density functional theory (DFT) calculation, electrokinetic measurements and surfactant property studies as well. In addition, the role of corn starch in the selective depression of diaspore was also explained.
- Published
- 2009
5. Simultaneous determination of 24 phthalates in liquors using front adsorption technology and ultra performance liquid chromatography-tandem mass spectrometry
- Author
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Wu Min, Zhang Zhigang, Lin Liyi, Zheng Xianghua, Chen Yan, and Huang Zhiqiang
- Subjects
Chromatography ,Chemistry ,General Chemical Engineering ,010401 analytical chemistry ,Organic Chemistry ,Analytical chemistry ,010402 general chemistry ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,Analytical Chemistry ,Adsorption ,Liquid chromatography–mass spectrometry ,Electrochemistry - Abstract
建立了前吸附技术-超高压液相色谱-串联质谱测定酒中24种邻苯二甲酸酯含量的方法。酒类样品经稀释、净化后采用前吸附技术排除仪器管路中的本底干扰,经超高压液相色谱-串联质谱仪进行测定。采用多反应监测模式、电喷雾电离源正离子(ESI + )模式进行检测,外标法定量。24种邻苯二甲酸酯在0.005~2.00 mg/L范围内线性关系良好,相关系数( r )均大于0.99,检出限( S / N =3)为0.003~0.05 mg/kg。以不含增塑剂的酒类样品作为空白样品进行加标回收率试验,各种邻苯二甲酸酯化合物的回收率为75.4%~118.2%,相对标准偏差(RSD)为4.0%~11.2%。该法不但可以有效排除管路中邻苯二甲酸酯本底的干扰,而且简单、灵敏、稳定。
- Published
- 2016
6. Application of a new amidoxime surfactant in flotation separation of scheelite and calcite: Adsorption mechanism and DFT calculation.
- Author
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Huang, Zhiqiang, Shuai, Shuyi, Burov, Vladimir E., Poilov, Vladimir Z., Li, Fangxu, Wang, Hongling, Liu, Rukuan, Zhang, Shiyong, Cheng, Chen, Li, Wenyuan, Yu, Xinyang, He, Guichun, and Fu, Weng
- Subjects
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CALCITE , *SCHEELITE , *SURFACE active agents , *ADSORPTION (Chemistry) , *CONTACT angle , *DENSITY functional theory , *FLOTATION , *DISSOLVED air flotation (Water purification) - Abstract
Separation of scheelite from calcite by froth flotation using a new amidoxime surfactant - 3-dodecylamine propyl amidoxime (DPA). [Display omitted] • A new amidoxime surfactant DPA was used to flotation separate scheelite and calcite. • Scheelite and calcite recovery were 92% and 4.5% respectively. • DPA exhibited preferable selectivity than NaOL in the absence of depressant. • The interaction of DPA surfactant on scheelite surface is electrostatic adsorption. With its high electrical conductivity, thermal creep resistance and compression modulus, tungsten take an irreplaceable position in modern industry, defense, and high technology. Scheelite, as the main raw material of tungsten resources, usually adopts Petrov' process: steam heating 80 °C-90 °C, stirring in a tank containing 2%-4% sodium silicate solution for more than half an hour to make sodium oleate desorbed on the calcite surface, and repeated cleaning. Herein, a new amidoxime surfactant 3-dodecylamine propyl amidoxime (DPA), had been synthesized and used as a collector for the first time in the flotation separation of scheelite and calcite at room temperature without any sodium silicate, and compared with the traditional collector sodium oleate (NaOL). The flotation behavior of DPA was studied by micro-flotation and mixed binary mineral flotation tests, which showed that DPA has good collection ability and excellent selectivity for scheelite. Meanwhile, the interaction mechanism of DPA on the mineral surface was discussed by FTIR analysis, zeta potential test, contact angle measurement and density functional theory (DFT). FTIR analysis and zeta potential test confirmed that DPA collector had adsorption on scheelite surface but had little effect on calcite. DFT calculation further confirmed that the positively charged –C(NOH)N+H 3 group in DPA had electrostatic adsorption on the negatively charged scheelite surface. The contact angle measurement results revealed that DPA can enhance the surface hydrophobicity of the scheelite particles. Therefore, this highly selective DPA surfactant can achieve effective separation of scheelite and calcite, contributing to environmental protection and sustainable green development of resources. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
7. Selective separation of wolframite from calcite by froth flotation using a novel amidoxime surfactant: Adsorption mechanism and DFT calculation.
- Author
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Shuai, Shuyi, Huang, Zhiqiang, Burov, Vladimir E., Poilov, Vladimir Z., Li, Fangxu, Wang, Hongling, Liu, Rukuan, Zhang, Shiyong, Cheng, Chen, Li, Wenyuan, Yu, Xinyang, He, Guichun, and Fu, Weng
- Subjects
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CALCITE , *WOLFRAMITE , *SURFACE active agents , *CONTACT angle , *ADSORPTION (Chemistry) , *ZETA potential , *FLOTATION , *DISSOLVED air flotation (Water purification) - Abstract
Wolframite was separated and extracted from calcite by using a new type of amidoxime surfactant − 3-dodecylamine propyl amidoxime (DPA) as a flotation collector. [Display omitted] • A novel amidoxime surfactant DPA was synthesized by lab. • DPA was first introduced in flotation for separation of wolframite from calcite. • DPA has superior selective adsorption performance at wolframite interface. • The wolframite recovery was 96% and calcite only 2 % at pH 7 and 2 × 10-4mol/L DPA. This study concentrated on the adsorption features and mechanism of a novel amidoxime surfactant 3-dodecylamine propyl amidoxime (DPA) used as a new wolframite collector on wolframite and calcite surfaces. The flotation experiment showed that DPA collector has a remarkable flotation separation effect on wolframite and calcite. Additionally, the results of the contact angle and zeta potential measurements, and FTIR spectral analysis revealed that the DPA had produced strong electrostatic adsorption on the surface of wolframite, but almost no adsorption on calcite. The results of the DFT calculation showed that DPA had a strong effect on the wolframite surface mainly through the positive charged –C(NOH)N+H 3 group. It provides a new idea for the flotation separation of wolframite and calcite. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
8. Investigations on reverse cationic flotation of iron ore by using a Gemini surfactant: Ethane-1,2-bis(dimethyl-dodecyl-ammonium bromide).
- Author
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Huang, Zhiqiang, Zhong, Hong, Wang, Shuai, Xia, Liuyin, Zou, Wenbo, and Liu, Guangyi
- Subjects
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IRON ores , *SURFACE active agents , *AMMONIUM bromide , *MAGNETITE , *ADSORPTION (Chemistry) , *SURFACE tension , *ZETA potential - Abstract
In this paper, a Gemini surfactant, ethane-1,2-bis(dimethyl-dodecyl-ammonium bromide) (EBAB), was introduced as a collector for reverse cationic flotation separation of quartz from magnetite, and its adsorption mechanisms on the two minerals and air/water interface were also investigated by FTIR spectra, zeta potential, density functional theory (DFT) calculation and surface tension. The flotation results showed that EBAB presented stronger collecting power than the conventional monomeric surfactant dodecylammonium chloride (DAC) and superior selectivity for quartz against magnetite. The results of FTIR spectra and zeta potential measurements demonstrated that the interaction of EBAB with quartz and magnetite was mainly through electrostatic attraction, which was further confirmed by DFT calculation. EBAB was preferred to adsorb on the negatively charged surface of quartz, increasing its zeta potentials and improving its hydrophobicity. Adsorption of EBAB at the quartz/water interface could be divided into four stages as the concentration of EBAB was increased in solution. At low concentrations, adsorption was controlled primarily by electrostatic interactions, but when the zeta potential of quartz was reversed from negative to positive, hydrophobic chain interactions controlled the adsorption process. EBAB’s unique properties, such as high positive grouping Mulliken charge of –CH 2 N + (CH 3 ) 2 (CH 2 ) 2 (CH 3 ) 2 N + CH 2 –, and strong “surface activity” at the air–water interface, made it be a superior cationic collector for reverse flotation desilication from iron ores. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
9. A novel 3-tetradecylamine propyl amidoxime collector for highly efficient flotation of fine kaolinite.
- Author
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Ouyang, Liaoyuan, Wu, Jingjie, Huang, Zhiqiang, Burdonov, Aleksandr E., Vchislo, Nadezhda V., Wang, Hongling, He, Guichun, Yu, Xinyang, Ma, Jinpeng, and Li, Wenyuan
- Subjects
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FOURIER transform infrared spectroscopy , *DENSITY functional theory , *SURFACE potential , *KAOLINITE , *CONTACT angle , *ZETA potential - Abstract
How to flotation fine kaolinite efficiently is a challenge. For the improvement of fine kaolinite flotation recovery, a novel 3-tetradecylamine propyl amidoxime (TPA) collector was synthesized. In comparison to the conventional collector tetradecylamine (TDA), the fine kaolinite exhibited better floatability in the TPA system, with a recovery of 90.5% in micro-flotation experiments. It was indicated by contact angle tests that TPA was more effective in improving the hydrophobicity of kaolinite by increasing its contact angle from 24.5° to 85°. Fourier transform infrared spectroscopy (FTIR) indicated that the adsorption of TPA on kaolinite surface was by electrostatic interaction, and zeta potential tests showed a significant increase in the surface potential. In addition, it was learned that TPA interacts with the kaolinite surface more effectively than TDA by using density functional theory (DFT) calculation. Therefore, TPA with excellent performance is expected to be a novel and efficient fine kaolinite flotation collector. [Display omitted] • Conventional collectors are difficult to flotation fine kaolinite efficiently. • Novel TPA collector exhibited excellent flotation performance for fine kaolinite. • Adsorption mechanism of TPA molecules at kaolinite surfaces was investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
10. N1,N10-dihydroxydecanediamide: Its separation performance and action mechanism for malachite, calcite and quartz.
- Author
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Cheng, Chen, Wu, Jingjie, and Huang, Zhiqiang
- Subjects
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CALCITE , *MALACHITE , *QUARTZ , *HYDROXAMIC acids , *COPPER , *ZETA potential - Abstract
The diagrammatic sketch of flotation separation of calcite and quartz from malachite ore by using DHH/OHA. [Display omitted] • N1,N10 -dihydroxydecanediamide (DHH) was introduced in malachite flotation firstly. • Calcite and quartz were separated by flotation using DHH collector. • DHH exhibited an excellent collecting ability to malachite. In this study, a novel collector, N1,N10 -dihydroxydecanediamide (DHH) was synthesized in our lab and introduced in flotation of malachite ore. The separation performance and action mechanism of DHH were explored and compared with octyl hydroxamic acid (OHA). The results of single mineral flotation tests indicated that DHH exhibited a stronger collecting ability to malachite and better selectivity against quartz and calcite than OHA, and floated out 94 % malachite, 8.5 % quartz and 17 % calcite at pH = 10 with a collector concentration of 60 mg/L. The FTIR spectra, zeta-potential tests and XPS tests proved that DHH could absorb onto malachite surface though a chemical mode. DFT calculation results showed that DHH anion owned a stronger affinity to malachite than DHH molecular and OHA anion/molecular, and its bis-minerophilic groups could form C(=O)NHO-Cu bond with surface Cu atom. It exhibited that DHH was an excellent candidate and capable for high efficiency flotation of malachite ore. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
11. Engineering Anion Resin based Amorphous Molybdenum Sulphide Composite for Treatment of Authentic Acid Mine Drainage.
- Author
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Fu, Weng, Ji, Guozhao, Chen, Huihuang, Yang, Siyuan, Yang, Hong, Guo, Bao, and Huang, Zhiqiang
- Subjects
ACID mine drainage ,CHLORIDE ions ,METAL ions ,ANIONS ,MOLYBDENUM ,ADSORPTION capacity ,ION-permeable membranes ,ION exchange resins - Abstract
Acid mine drainage (AMD) is an acidic effluent containing many toxic heavy metal ions (e.g. Cu
2+ , Cd2+ , Hg2+ ) in mining industry, leading to serious environmental issues such as natural soil and aquatic pollution that threats the whole ecosystem and biosafety. Conventional neutralization and precipitation process cannot effectively remove heavy metal ions due to the risk of secondary contamination. Herein, we report an engineered amorphous molybdenum sulphide composite for selective removal of heavy metal ions from other co-existing ions in AMD solution. This composite was prepared by a facile ion exchange reaction, in which tetrathiomolybdate (MoS 42- ) anions are firmly bonded to strong anion exchange resins by replacing chloride ions. The obtained composite was used to remove heavy metal ions from both synthetic and authentic AMD solution. The results of batch and fixed-bed column tests suggest high selectivity towards heavy metals, fast adsorption kinetics, good reusability and excellent adsorption capacities in the order of Hg(II)>>Pb(II)>Cu(II)>Cd(II). The adsorption data are fitted well by Langmuir model, indicating the single-layer adsorption mechanism. The theoretical adsorption capacities calculated by Langmuir model are 259.0 mg/g for Cu(II), 204.1 mg/g for Cd(II), 495.0 mg/g for Pb(II) and 1538.4 mg/g for Hg(II). The interaction between metal ions (Cu, Cd, Pb, Hg) and MoS 42- anions are demonstrated by the formation of Mo-S-metal (Cu, Cd, Pb, Hg) bonding (the red shift of S2p peak in XPS spectra). Our results support the potential practical application of this new material for scavenging heavy metal ions in AMD wastewater. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
12. Flotation performance and adsorption mechanism of malachite with tert-butylsalicylaldoxime.
- Author
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Li, Liqing, Zhao, Jinghua, Xiao, Yanyin, Huang, Zhiqiang, Guo, Zhizhong, Li, Fangxu, and Deng, Lanqing
- Subjects
- *
ADSORPTION (Chemistry) , *CALCITE , *GRAPHICAL modeling (Statistics) , *GROUP rings , *SPECTRUM analysis - Abstract
Graphical abstract Absorption model of tert -butylsalicylaldoxime (TBSA) on the surface of malachite. Highlights • Tert -butylsalicylaldoxime (TBSA) was introduced in malachite flotation. • TBSA exhibited superior selectivity for malachite against calcite or silica. • TBSA adsorbed on malachite surfaces though N O Cu and d-pπ bond. Abstract In this research, the flotation performance and adsorption mechanism of tert -butylsalicylaldoxime (TBSA) to malachite were studied by micro-flotation, contact angle, zeta potential, FTIR and XPS analysis. The result of micro-flotation tests indicated TBSA yielded high malachite recovery and satisfied selectivity against calcite or silica at pH 9.0–10.5. The contact angle results inferred that the hydrophobicity of malachite surfaces was improved after TBSA modification. The results of zeta potential suggested that TBSA might chemisorb on malachite surfaces. XPS and IR spectrum analysis confirmed that the O atoms in C N OH group and benzene ring fixed with Cu species on malachite surfaces through C O Cu, N O Cu and d-pπ bond respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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