等离子体协同光催化降解钾浮选药剂十八胺的研究

doi:10.19964/j.issn.1006-4990.2024-0627

摘要/Abstract

摘要：

当前钾肥浮选后残留的浮选药剂十八胺（ODA）随尾液直接排入环境中，对盐湖区生态系统的稳定性和下游高价值化学品的高值化利用带来不利影响。为了解决这一问题，采用等离子体协同TiO₂光催化技术对ODA进行降解。以ODA中的胺基浓度作为评价指标，通过实验考察输入功率、催化剂用量及等离子体和光催化协同效应对降解率的影响，揭示降解过程中O₃、H₂O₂和·OH浓度的变化规律，并检测降解过程中产生的自由基，阐明其协同降解机制。实验结果表明，对于初始质量浓度为30 mg/L的ODA溶液，当输入功率设置为25 W、TiO₂用量为17 mg时，协同降解效率最高，能够在12 min内实现ODA的完全降解。与单一光催化和等离子催化降解相比，等离子体协同光催化技术能显著加快十八胺的降解速率。等离子体协同光催化技术可实现对ODA的高效降解，进而促进盐湖资源的多元化、精细化、高值化利用。

关键词: 等离子体, 光催化, 二氧化钛, 浮选药剂, 十八胺

Abstract:

The residual flotation reagent octadecylamine（ODA） after potassium fertilizer flotation is directly discharged into the environment with the tailings，which has adverse effects on the stability of the ecosystem in salt lake areas and the high⁃value utilization of downstream high⁃value chemicals.To address this issue，the plasma assisted TiO₂photocatalytic technology was employed to investigate the degradation of ODA aqueous solution.Using the concentration of amine groups in ODA as an evaluation index，the effect of input power，catalyst dosage，and synergistic effect of plasma and photocatalysis on degradation efficiency were investigated through experiments.The changes in O₃，H₂O₂，and ·OH concentrations during the degradation process were studied，and the free radicals generated during the degradation process were detected to elucidate their synergistic degradation mechanism.The experimental results showed that for an ODA solution with an initial concentration of 30 mg/L，the synergistic degradation efficiency was highest when the input power was set to 25 W and the TiO₂ dosage was 17 mg，and complete degradation of ODA could be achieved within 12 minutes.Compared with single photocatalysis and plasma catalysis degradation，plasma assisted photocatalysis technology could significantly accelerate the degradation rate of octadecylamine.The synergistic plasma⁃photocatalytic degradation technology demonstrated exceptional efficiency in ODA decomposition，thereby facilitating the diversified，refined，and high⁃value utilization of salt lake resources.

Key words: plasma, photocatalysis, titanium dioxide, floatation agents, octadecylamine

中图分类号:

TQ426

李旭日, 马亮, 张思远, 刘海宁, 崔香梅, 叶秀深. 等离子体协同光催化降解钾浮选药剂十八胺的研究[J]. 无机盐工业, 2026, 58(1): 107-114.

LI Xuri, MA Liang, ZHANG Siyuan, LIU Haining, CUI Xiangmei, YE Xiushen. Study on degradation of potassium flotation reagent octadecylamine by plasma⁃assisted photocatalysis[J]. Inorganic Chemicals Industry, 2026, 58(1): 107-114.

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