Scholarlink

<p>Arsenic (As) contaminated water poses a significant environmental and public health threat due to its toxicological effects. The current study advances the field through several key contributions specific to optimized nano-zero valent iron (nZVI) and its wheat straw-derived composite (nZVIBC) to evaluate their batch and column scale adsorption potential for As removal from water. The materials were characterized with FTIR, SEM, XRD, BET and point of zero charge. The influence of initial As levels (0.1–4&#xa0;mg/L), dosage (0.5–2&#xa0;g/L), pH (2–10), co-exiting ions, and contact time (15–180&#xa0;min) was estimated. The results revealed the highest As adsorption (3.60&#xa0;mg/g) onto nZVIBC, followed by BC (3.25&#xa0;mg/g) and nZVI (2.95&#xa0;mg/g) at optimum pH-4, adsorbent dose (1&#xa0;g/L) and As level (4&#xa0;mg/L). The respective As removal was 98%, 93% and 87%. Maximum As adsorption occurred during the first 30&#xa0;min, then adsorption rate showed a decline and approached to equilibrium after 60&#xa0;min. Column scale experiments yielded As removal of 94%, 92%, and 98% by BC, nZVI, and nZVIBC, respectively after 1&#xa0;h of injection at 0.5&#xa0;mg/L. The nZVIBC exhibited tremendous reusability and stability. Maximum decline in As removal was observed with coexisting phosphate. Freundlich model and pseudo-second order adsorption models well-explained the experimental As adsorption (R<sup>2</sup> = 0.99). Results revealed that As adsorption and removal was attributed to electrostatic interactions, hydrogen bonding, and redox reactions. Overall, nZVIBC proved a promising and effective material for the remediation of As-contaminated water, offering potential for sustainable water treatment applications. Moreover, future efforts should focus on pilot-scale testing and life-cycle assessment to fully evaluate the socio-economic viability.</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

Synergistic Arsenic Adsorption by Nano Zero-Valent Iron and Biochar: Batch and Column Scale Performance

  • 期刊论文

  • 发表日期：

    2025年10月2日

查看全文
  • Muhammad Asif Naeem,
  • Muhammad Imran,
  • Muhammad Amjad,
  • Ghulam Mustafa Shah,
  • Ghulam Abbas,
  • Behzad Murtaza,
  • Muhammad Shafique Khalid,
  • Hafiz Faiq Bakhat,
  • Samina Khalid,
  • Muhammad Imtiaz Rashid

摘要

Arsenic (As) contaminated water poses a significant environmental and public health threat due to its toxicological effects. The current study advances the field through several key contributions specific to optimized nano-zero valent iron (nZVI) and its wheat straw-derived composite (nZVIBC) to evaluate their batch and column scale adsorption potential for As removal from water. The materials were characterized with FTIR, SEM, XRD, BET and point of zero charge. The influence of initial As levels (0.1–4 mg/L), dosage (0.5–2 g/L), pH (2–10), co-exiting ions, and contact time (15–180 min) was estimated. The results revealed the highest As adsorption (3.60 mg/g) onto nZVIBC, followed by BC (3.25 mg/g) and nZVI (2.95 mg/g) at optimum pH-4, adsorbent dose (1 g/L) and As level (4 mg/L). The respective As removal was 98%, 93% and 87%. Maximum As adsorption occurred during the first 30 min, then adsorption rate showed a decline and approached to equilibrium after 60 min. Column scale experiments yielded As removal of 94%, 92%, and 98% by BC, nZVI, and nZVIBC, respectively after 1 h of injection at 0.5 mg/L. The nZVIBC exhibited tremendous reusability and stability. Maximum decline in As removal was observed with coexisting phosphate. Freundlich model and pseudo-second order adsorption models well-explained the experimental As adsorption (R2 = 0.99). Results revealed that As adsorption and removal was attributed to electrostatic interactions, hydrogen bonding, and redox reactions. Overall, nZVIBC proved a promising and effective material for the remediation of As-contaminated water, offering potential for sustainable water treatment applications. Moreover, future efforts should focus on pilot-scale testing and life-cycle assessment to fully evaluate the socio-economic viability.