A novel interaction theory for the starch adsorption onto hematite surface

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL
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Abstract

Depressant starch (NS) was generally used in hematite flotation, while the adsorption mechanism of the macromolecular polymer onto mineral surfaces remained in question. In this study, novel detection approaches and computational chemistry methods were introduced to update the widely-accepted acid-base interaction theory. Microflotation tests confirm that the hematite flotation recovery was easily depressed by NS under the acid or alkaline conditions rather than the neutral condition. Zeta potential measurement shows that NS could change the zeta potential of hematite, while the shift amplitude ranked as alkaline > acid > neutral, indicating the most suitable pH range is the alkaline condition. XPS analysis reveals that NS could chemisorbed onto Fe atoms of hematite surface via C-O groups in the whole studied pH range. It was further verified using AFM tests, in which the NS has a stronger interaction force under the alkaline environment. MDS further indicates that the interaction energy between NS and the (0 0 1) hematite surface was three times greater than others under alkaline conditions. In general, the interaction force at the interface between the hematite surface and NS was a strong chemical adsorption at the alkaline conditions while there was weak chemisorption and hydrogen bonding under the neutral or acidic conditions.

Abstract Image

赤铁矿表面淀粉吸附的新型相互作用理论
赤铁矿浮选过程中通常会用到消沉淀粉(NS),但这种大分子聚合物在矿物表面的吸附机理仍是个问题。本研究引入了新的检测方法和计算化学方法,更新了被广泛接受的酸碱相互作用理论。微浮选试验证实,在酸性或碱性条件下,赤铁矿的浮选回收率容易受到 NS 的抑制,而不是在中性条件下。Zeta电位测量结果表明,NS能改变赤铁矿的Zeta电位,其移动幅度依次为碱性、酸性和中性,表明最适合的pH值范围是碱性条件。XPS 分析表明,在整个研究的 pH 值范围内,NS 可通过 C-O 基团化学吸附在赤铁矿表面的铁原子上。原子力显微镜测试进一步验证了这一点,即在碱性环境下,NS具有更强的相互作用力。MDS 进一步表明,在碱性条件下,NS 与(0 0 1)赤铁矿表面的相互作用能是其他物质的三倍。总的来说,在碱性条件下,赤铁矿表面与 NS 之间的界面相互作用力是一种强化学吸附力,而在中性或酸性条件下则是一种弱化学吸附力和氢键作用力。
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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
期刊介绍: The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)
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