首页> 外文期刊>ACS applied materials & interfaces >Corn Stalk-Derived Carbon Quantum Dots with Abundant Amino Groups as a Selective-Layer Modifier for Enhancing Chlorine Resistance of Membranes
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Corn Stalk-Derived Carbon Quantum Dots with Abundant Amino Groups as a Selective-Layer Modifier for Enhancing Chlorine Resistance of Membranes

机译:玉米茎衍生的碳量子点,具有丰富的氨基作为选择性层改性剂,用于提高膜的氯抗性

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摘要

Low permeability and chlorine resistance of normal thin-film composite (TFC) membranes restrict their practical applications in many fields. This study reports the preparation of a high chlorine-resistant TFC membrane for forward osmosis (FO) by incorporating corn stalk-derived N-doped carbon quantum dots (N-CQDs) into the selective polyamide (PA) layer to construct a polydopamine (PDA) sub-layer (PTFC_(CQD)). Membrane modification is characterized by surface morphology, hydrophilicity, Zeta potential, and roughness. Results show that TFC_(CQD) (without PDA pretreatment) and PTFC_(CQD) membranes possess greater negative surface charges and thinner layer-thickness (less than 68 nm). With N-CQDs and PDA pretreatment, the surface roughness of the PTFC_(CQD) membrane decreases significantly with the co-existence of microsized balls and flocs with a dense porous structure. With the variation of concentration and type of draw solution, the PTFC_(CQD) membrane exhibits an excellent permeability with low J _((reverse?salt?flux))/J _((water?flux)) values (0.1-0.25) due to the enhancement of surface hydrophilicity and the shortening of permeable paths. With 16,000 ppm·h chlorination, reverse salt flux of the PTFC_(CQD) membrane (8.4 g m~(–2) h~(–1)) is far lower than those of TFC_(CQD) (136.2 g m~(–2) h~(–1)), PTFC (127.6 g m~(–2) h~(–1)), and TFC (132 g m~(–2) h~(–1)) membranes in FO processes. The decline of salt rejection of the PTFC_(CQD) membrane is only 8.2%, and the normalized salt rejection maintains 0.918 in the RO system (16,000 ppm·h chlorination). Super salt rejection is ascribed to the existence of abundant N—H bonds (N-CQDs), which are preferentially chlorinated by free chlorine to reduce the corrosion of the PA layer. The structure of the PA layer is stable during chlorination also due to the existence of various active groups grafted on the surface. This study may pave a new direction for the preparation of durable biomass-derivative (N-CQD)-modified membranes to satisfy much more possible applications.
机译:普通薄膜复合膜(TFC)的低渗透性和耐氯性限制了其在许多领域的实际应用。本研究报告了通过将玉米秸秆衍生的N-掺杂碳量子点(N-CQD)加入选择性聚酰胺(PA)层以构建聚多巴胺(PDA)亚层(PTFC(CQD))来制备用于正渗透(FO)的高耐氯TFC膜。膜改性的特点是表面形态、亲水性、Zeta电位和粗糙度。结果表明,未经PDA预处理的TFC膜(CQD)和PTFC膜(CQD)具有较大的表面负电荷和较薄的膜厚(小于68nm)。通过N-CQDs和PDA预处理,PTFC_qD(CQD)膜的表面粗糙度随着具有致密多孔结构的微型球和絮体的共存而显著降低。随着溶液浓度和类型的变化,由于表面亲水性的增强和渗透路径的缩短,PTFC_D(CQD)膜表现出良好的渗透性,具有较低的J_((反向盐通量))/J_((水通量))值(0.1-0.25)。在16000 ppm·h氯化条件下,PTFC_Ud膜(8.4 g m~(-2)h~(-1))的反盐通量远低于TFC_Ud膜(136.2 g m~(-2)h~(-1))、PTFC膜(127.6 g m~(-2)h~(-1))和TFC膜(132 g m~(-2)h~(-1))的反盐通量。PTFC(CQD)膜的盐截留率下降仅为8.2%,在反渗透系统(16000 ppm·h氯化)中,标准化盐截留率保持在0.918。超盐截留归因于大量N-H键(N-CQD)的存在,这些键优先被游离氯氯化,以减少PA层的腐蚀。在氯化过程中,PA层的结构是稳定的,这也是由于表面接枝了各种活性基团。本研究为制备耐久性生物质衍生物(N-CQD)改性膜以满足更多可能的应用奠定了新的方向。

著录项

  • 来源
    《ACS applied materials & interfaces》 |2021年第19期|共14页
  • 作者单位

    Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China School of Chemistry and Materials Science Heilongjiang University;

    Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China School of Chemistry and Materials Science Heilongjiang University;

    Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China School of Chemistry and Materials Science Heilongjiang University;

    State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology;

    Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China School of Chemistry and Materials Science Heilongjiang University;

    School of Civil Engineering Heilongjiang Institute of Technology;

    Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China School of Chemistry and Materials Science Heilongjiang University;

    Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China School of Chemistry and Materials Science Heilongjiang University;

    Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China School of Chemistry and Materials Science Heilongjiang University;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    carbon quantum dots; chlorine resistance; corn stalks; polyamide membrane; water filtration;

    机译:碳量子点;耐氯性;玉米秸秆;聚酰胺膜;水过滤;
  • 入库时间 2022-08-20 20:23:41

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