MINERALS ENGINEERING
·
2021
·
IF 4.765
Bin Yang,Ya-Feng Fu,Wan-Zhong Yin,Qiu-Yue Sheng,Zhang-Lei Zhu,Xue-Ming Yin
In this study, laurylamine ethoxylate with fifteen ethoxylate units (LAEO-15) was employed as a quartz collector for the recovery of malachite from quartz via reverse flotation. Its collecting performance and adsorption mechanism were evaluated by flotation tests and surface analyses. The results of flotation tests suggested that LAEO-15 had an intense ability to collect quartz instead of malachite, and displayed a high flotation selectivity, which promoted the significant floatability differences of both minerals. XPS confirmed that quartz adsorbed a much larger quantity of LAEO-15 than malachite, resulting in the selective collection of quartz with LAEO-15. Zeta potential and FTIR characterization further uncovered that the strong adsorption of LAEO-15 was driven by hydrogen bonding and electrostatic attraction, while electrostatic repulsion hindered the LAEO-15 adsorption on the surface of malachite. As a result, the effective separation of malachite and quartz was realized with 20 mg/L LAEO-15 at pH 6.30 via reverse flotation, in which 92.54% of malachite was recovered and 92.72% of quartz was removed, coupled with a high SI value of 12.57 in concentrate. Therefore, compared with conventional collector dodecylamine, LAEO-15 exhibited high selectivity and purification effectiveness for the separation of malachite from quartz.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Bin Wen,Zhongyu Yan,Jiahao Feizheng,Yike Huang,Chian Fang,Sihan Zhao,Jing Li,Daliang Guo,Huifang Zhao,Lizheng Sha,Qianyu Sun,Yinchao Xu
In this study, a brand-new, easy, and environmentally friendly approach for chemically functionalizing 2,2,6,6-tetramethylpiperidinyloxyl radical (TEMPO)-oxidized cellulose nanofiber (TOCNF) to produce modified cellulose nanofiber (octadecylamine-citric acid-CNF) was proposed. Effects of octadecylamine (ODA)/TOCNF mass ratio on the chemical structure , morphology, surface hydrophobicity and oleophobicity were studied. According to Fourier transform infrared spectroscopy (FTIR) analysis, ODA was successfully grafted onto the TOCNF by simple citric acid (CA) esterification and amidation reactions. Scanning electron microscopy (SEM) showed that a new rough structure was formed on the ODA-CA-CNF surface. The water contact angle (WCA) and the castor oil contact angle (OCA) of the ODA-CA-CNF reached 139.6° and 130.6°, respectively. The high-grafting-amount ODA-CA-CNF was sprayed onto paper, and the OCA reached 118.4°, which indicated good oil-resistance performance. The low-grafting-amount ODA-CNF was applied in a pH-responsive indicator film, exhibiting a colour change in response to the pH level, which can be applied in smart food packaging. The ODA-CA-CNF with excellent water/oil-resistance properties and fluorine-free properties can replace petrochemical materials and can be used in the fields of fluorine-free oil-proof paper.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Ying Bi,Liwu Zu,Zuoyuan Zhang,Lu Zhang,Binhui Zhao,Shanshan Cong,Tianyu Lan,Shaobo Dong,Yazhen Wang,Jiahang Xu
In accordance with the principle of green synthesis, two biobased benzoxazines with high-purity bifunctional groups, diethylstilbestrol-laurylamine (D-la) and diethylstilbestrol-furfurylamine (D-fa), were prepared by the solution method from laurylamine/furfurylamine, diethylstilbestrol, and polyformaldehyde. The synthesis process is simple, and the post-treatment is convenient. The structures of the synthesized monomers were characterized by Fourier transform infrared (FT-IR) spectroscopies, 1H NMR, and 13C NMR nuclear magnetic resonance. Monomer thermal polymerization and copolymerization were studied and monitored by differential scanning calorimetry (DSC) and FT-IR. DSC showed that D-la had a very wide processing window (132 °C), and the curing temperature gradually decreased between 249 and 255 °C with the increase in its content. The thermal stability of D-fa was studied by thermogravimetric analysis and dynamic thermomechanical analysis, and the test results showed that D-fa had a higher residual carbon content (51%) compared with D-la and its copolymer. As the D-fa content increased, the residual carbon content and thermal stability also increased. Therefore, these two biobased benzoxazines featured excellent processability and thermal stability. This work has important reference values for designing biobased benzoxazines with high performance.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2021
·Vol. 11
·期 11
·1271
·
IF 2.644
Qingshan Zhang,Chenkai Niu,Xiangning Bu,Muhammad Bilal,Chao Ni,Yaoli Peng
Conventional hydrocarbon oil cannot adhere effectively to oxidized coal, resulting in a low yield of clean coal. In this study, a high-speed homogenizer was used to emulsify LDD (laurylamine dipropylene diamine) and kerosene, which enhanced the flotation efficiency of oxidized coal. The flotation results showed an increase from 4.12% (only kerosene) to 23.33% (emulsified oil). An increase in contact angle indicated that the mixture reagent can increase the hydrophobicity of coal particles, which is attributed to the adsorption of LDD onto the coal particle surface and the decrease of the oil droplet A lower surface tension of LDD allows it to produce a stable layer of froth than the layer generated by kerosene alone.Keywords:flotation of oxidized coal;laurylamine dipropylene diamine;emulsified kerosene;froth stability;coal hydrophobicity
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Bin Yang,Wanzhong Yin,Jin Yao,Zhanglei Zhu,Haoran Sun,Keqiang Chen,Shaohang Cao
Differential sorption behaviors of collectors at mineral/water interface play a crucial role in mineral flotation by selectively strengthening the hydrophobicity of the target minerals. To efficiently recover of magnesite from quartz, pentaethoxylated laurylamine (PEOLA) was introduced as a low-cost and high-selectivity collector to replace conventional collector laurylamine (LA). The collection performance and separation effectiveness of PEOLA were assessed by conducting flotation experiments. Furthermore, a series of surface detection experiments involving surface adsorption tests, zeta-potential characterization and FT-IR analysis, were conducted to uncover the selective collection mechanism of PEOLA toward quartz and magnesite. Flotation results indicated that compared with LA, PEOLA exhibited much better flotation selectivity for quartz against magnesite and could recover magnesite more effectively from quartz through reverse flotation. Therefore, PEOLA accomplished the efficient separation of magnesite and quartz, wherein 96.50% of magnesite was recovered and 95.50% of quartz was removed. Surface analyses demonstrated that a large quantity of PEOLA could be adsorbed onto quartz instead of magnesite, which promoted the efficient collection of quartz using PEOLA. Furthermore, the intense adsorption of PEOLA onto quartz was driven by the combination of electrostatic attraction and hydrogen bonding interactions. Thus, PEOLA can be considered as a high-performance and low-cost collector for efficiently recovering magnesite from quartz.
研究领域:
矿物加工
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）