Scholarlink

<p>High nitrate concentrations in water present serious risks to human health. This study evaluates two removal strategies: layered double hydroxide (LDH) nanoparticles (NPs) and LDH-incorporated thin‐film composite nanofiltration (TFC-NF) membranes to reduce nitrate concentration. First, Mg–Al, Ni–Fe, and Mn-impregnated Zn–Al LDH NPs were co-precipitated, characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) analysis, field emission scanning electron microscopy (FESEM), and zeta potential measurement, and tested in batch adsorption experiments (20&#xa0;mg/L nitrate solution, 1&#xa0;g/L adsorbent dosage). Among the LDH NPs tested, Ni–Fe LDH demonstrated the highest nitrate rejection, achieving 13–14% at this concentration, with no significant change with further calcination. Next, the TFC-NF membranes were fabricated by embedding LDH NPs into the support layer; one variant received additional layer-by-layer (LBL) surface modification. The membranes were also characterized using FESEM and then evaluated using a 50&#xa0;mg/L nitrate solution at 6&#xa0;bar pressure and 25&#xa0;°C. The TFC-NF membrane containing 0.25 wt% Mn-impregnated Zn–Al LDH achieved nitrate rejection of 43% with pure water flux (PWF) of 4.5&#xa0;L/m<sup>2</sup> h bar<sup>−1</sup>. Under the same conditions, the LBL-TFC NF membrane showed lower nitrate rejection of 17% but higher PWF of 7.7&#xa0;L/m<sup>2</sup> h bar<sup>−1</sup>.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Layered double hydroxides in nanofiltration as a new approach to nitrate removal

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月17日

查看全文
  • Hossein Haji Mohammadi Shire Jini,
  • Zahra Zangeneh,
  • Toraj Mohammadi,
  • Abbas Akbarzadeh

摘要

High nitrate concentrations in water present serious risks to human health. This study evaluates two removal strategies: layered double hydroxide (LDH) nanoparticles (NPs) and LDH-incorporated thin‐film composite nanofiltration (TFC-NF) membranes to reduce nitrate concentration. First, Mg–Al, Ni–Fe, and Mn-impregnated Zn–Al LDH NPs were co-precipitated, characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) analysis, field emission scanning electron microscopy (FESEM), and zeta potential measurement, and tested in batch adsorption experiments (20 mg/L nitrate solution, 1 g/L adsorbent dosage). Among the LDH NPs tested, Ni–Fe LDH demonstrated the highest nitrate rejection, achieving 13–14% at this concentration, with no significant change with further calcination. Next, the TFC-NF membranes were fabricated by embedding LDH NPs into the support layer; one variant received additional layer-by-layer (LBL) surface modification. The membranes were also characterized using FESEM and then evaluated using a 50 mg/L nitrate solution at 6 bar pressure and 25 °C. The TFC-NF membrane containing 0.25 wt% Mn-impregnated Zn–Al LDH achieved nitrate rejection of 43% with pure water flux (PWF) of 4.5 L/m2 h bar−1. Under the same conditions, the LBL-TFC NF membrane showed lower nitrate rejection of 17% but higher PWF of 7.7 L/m2 h bar−1.