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Preparation of a novel surfactant dibutyl (2-(hydroxyamino)-2-oxoethyl) phosphonate and its adsorption mechanism in cassiterite flotation

二丁基(2-(羟基氨基)-2-氧乙基)膦酸酯的制备及在锡石浮选中的吸附机理

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Abstract

A novel surfactant dibutyl (2-(hydroxyamino)-2-oxoethyl) phosphonate (DBPHA) was designed and synthesized as a cassiterite flotation collector. Micro-flotation experiment results indicated that under the condition of pH~9.00, collector initial concentration 8×10−5 mol/L, the flotation recovery of cassiterite reached about 90% using DBPHA as collector, while only 22% using BHA as collector. The adsorption mechanism of DBPHA on the cassiterite surface was investigated by zeta potential, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy measurements and density functional theory calculations. The changes in the zeta potential for the DBPHA-treated cassiterite particles demonstrated that DBPHA chemisorbed onto the cassiterite surface, while the addition of benzohydroxamic acid (BHA) barely changed the zeta potential of cassiterite. Density functional theory predicted that DBPHA possessed two active sites of the reaction center, namely, hydroxamate and phosphoryl groups, while BHA only had one hydroxamate group. Fourier transform infrared spectroscopy and high-resolution X-ray photoelectron spectroscopy spectra revealed that the chemisorption of DBPHA on cassiterite produced DBPHA-Sn surface species, where both hydroxamate (—C(=O) —NHOH) and phosphoryl (P=O) groups bonded with surface Sn atoms, causing the hydrophobic groups of DBPHA to orient towards the solutions for attaching bubbles. Therefore, an effective enrichment of cassiterite was achieved.

摘要

设计并合成了一种新型表面活性剂二丁基(2-(羟基氨基)-2-氧乙基)膦酸酯(DBPHA)作为锡石浮选 捕收剂。单矿物浮选实验结果表明, 在 pH~9.00、捕收剂初始浓度8×10−5 mol/L 的条件下, 以DBPHA 为捕收剂的锡石浮选回收率可达90%左右, 而以苯甲羟肟酸(BHA)为捕收剂的浮选回收率仅为22%。 通过zeta 电位、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)测量和密度泛函理论计算研究了 DBPHA在锡石表面的吸附机理。DBPHA处理过的锡石颗粒zeta 电位变化表明DBPHA化学吸附到锡 石表面, 而添加BHA几乎没有改变锡石的zeta 电位。密度泛函理论预测DBPHA具有两个反应中心活 性位点, 即异羟肟酸基和磷酰基, 而BHA只有一个异羟肟酸基活性位点。FTIR 和高分辨XPS 表明, DBPHA在锡石上的化学吸附产生了DBPHA-Sn表面物质, 其中异羟肟酸基(—C(=O)—NHOH) 和磷酰 基(P=O)基团与表面Sn 原子键合, 使得DBPHA的疏水基团朝向溶液中, 粘附气泡。因此, 实现了锡—C(=O)—NHOH)和磷酰 基(P=O)基团与表面Sn 原子键合, 使得DBPHA的疏水基团朝向溶液中, 粘附气泡。因此, 实现了锡 石的有效富集。

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Authors and Affiliations

  1. State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha, 410004, China

    Jing-jing Xiao  (肖静晶), Si-si Liu  (刘思思), Jia Tu  (涂佳), Ru-kuan Liu  (刘汝宽) & Chang-zhu Li  (李昌珠)

  2. School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China

    Jing-jing Xiao  (肖静晶) & Jing-zhi Wu  (吴经芝)

  3. School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

    Jing-jing Xiao  (肖静晶) & Gang Zhao  (赵刚)

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Contributions

XIAO Jing-jing provided the concept and edited the draft of manuscript. WU Jing-zhi analyzed the measured data. LIU Si-si and TU Jia conducted the literature review. LIU RU-kuan edited the draft of manuscript. LI Chang-zhu and ZHAO Gang established the models and calculated the predicted displacement.

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Correspondence to Chang-zhu Li  (李昌珠) or Gang Zhao  (赵刚).

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XIAO Jing-jing, WU Jing-zhi, LIU Si-si, TU Jia, LIU Ru-kuan, LI Chang-zhu, and ZHAO Gang declare that they have no conflict of interest.

Foundation item: Project(22108114) supported by the National Natural Science Foundation of China

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Xiao, Jj., Wu, Jz., Liu, Ss. et al. Preparation of a novel surfactant dibutyl (2-(hydroxyamino)-2-oxoethyl) phosphonate and its adsorption mechanism in cassiterite flotation. J. Cent. South Univ. 30, 1569–1580 (2023). https://doi.org/10.1007/s11771-023-5318-4

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