Scholarlink

<p>Heavy metal (HM) contamination of agricultural soils poses a significant environmental challenge, threatening crop productivity and ecological health. This study investigated the potential of hydrochar derived from pistachio residues (HC), hydrochar modified with zero-valent zinc nanoparticles (HC-nZVZ), and nZVZ stabilized with carboxymethyl cellulose on hydrochar (HC-nZVZ-CMC) for immobilizing and bioavailability of Pb, Cd, Ni, and Cu in soil cultivated with quinoa. A 60-day pot experiment was conducted under greenhouse conditions with dosages of 1% and 2% (w/w). All amendments significantly enhanced quinoa root and shoot biomass and reduced HM uptake compared to the control (<i>p</i> &lt; 0.05). The HC-nZVZ-CMC treatment exhibited the highest efficacy, increasing root and shoot dry weights by 82% and 87%, respectively, while decreasing metal uptake in shoots and roots by 70–90% and 59–83%. The transfer factor (TF) and bioconcentration factor (BCF) of metals were reduced to below 1 by HC-nZVZ and HC-nZVZ-CMC treatments, indicating decreased metal mobility and bioavailability. Soil pH increased to 8.0 following amendments, accompanied by increases in N, P, K, and SOM content by up to 31%, 39%, 75%, and 54%, respectively, and a reduction in EC by up to 69%. Antioxidant enzyme activities (SOD, CAT, POD) increased by up to 93%, 88%, and 85%, while oxidative stress markers (MDA and H<sub>2</sub>O<sub>2</sub>) decreased by up to 81% and 74%. indicating reduced oxidative damage. Metal accumulation followed Ni &gt; Cd &gt; Cu &gt; Pb. Stabilizing HC-nZVZ with CMC significantly improved hydrochar’s efficiency, offering a sustainable, cost-effective strategy for remediating heavy metal-contaminated soils.</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

Immobilizing heavy metals in contaminated soil by hydrochar modified with carboxymethyl cellulose-stabilized zinc nanoparticles

  • 期刊论文

  • 发表日期：

    2025年12月29日

查看全文
  • Abolfazl Khademi-Jolgenejad,
  • Majid Fekri,
  • Majid Hejazi-Mehrizi,
  • Zohreh Ranjbar

摘要

Heavy metal (HM) contamination of agricultural soils poses a significant environmental challenge, threatening crop productivity and ecological health. This study investigated the potential of hydrochar derived from pistachio residues (HC), hydrochar modified with zero-valent zinc nanoparticles (HC-nZVZ), and nZVZ stabilized with carboxymethyl cellulose on hydrochar (HC-nZVZ-CMC) for immobilizing and bioavailability of Pb, Cd, Ni, and Cu in soil cultivated with quinoa. A 60-day pot experiment was conducted under greenhouse conditions with dosages of 1% and 2% (w/w). All amendments significantly enhanced quinoa root and shoot biomass and reduced HM uptake compared to the control (p < 0.05). The HC-nZVZ-CMC treatment exhibited the highest efficacy, increasing root and shoot dry weights by 82% and 87%, respectively, while decreasing metal uptake in shoots and roots by 70–90% and 59–83%. The transfer factor (TF) and bioconcentration factor (BCF) of metals were reduced to below 1 by HC-nZVZ and HC-nZVZ-CMC treatments, indicating decreased metal mobility and bioavailability. Soil pH increased to 8.0 following amendments, accompanied by increases in N, P, K, and SOM content by up to 31%, 39%, 75%, and 54%, respectively, and a reduction in EC by up to 69%. Antioxidant enzyme activities (SOD, CAT, POD) increased by up to 93%, 88%, and 85%, while oxidative stress markers (MDA and H2O2) decreased by up to 81% and 74%. indicating reduced oxidative damage. Metal accumulation followed Ni > Cd > Cu > Pb. Stabilizing HC-nZVZ with CMC significantly improved hydrochar’s efficiency, offering a sustainable, cost-effective strategy for remediating heavy metal-contaminated soils.