Kinetics of Solvent Blue and Reactive Yellow removal using microwave radiation in combination with nanoscale zero-valent iron.

Journal of environmental sciences (China) · 2015 · Benefit · Low evidence

← Research stream

BenefitLow evidencePaper 6576

Study snapshot

PublicationJournal of environmental sciences (China) · 2015

Study typeother

Reported directionBenefit

Evidence ratingLow

Abstract

We investigated the efficiency and kinetics of the degradation of soluble dyes over the pH range 5.0-9.0 using a method employing microwave radiation in combination with nanoscale zero-valent iron (MW-nZVI). The nZVI particles (40-70 nm in diameter) were prepared by a liquid-phase chemical reduction method employing starch as a dispersant. Compared to the removal of Solvent Blue 36 and Reactive Yellow K-RN using only nZVI, more rapid and efficient dye removal and total organic carbon removal were achieved using MW-nZVI. The dye removal efficiency increased significantly with decreasing pH, but was negligibly affected by variation in the microwave power. The kinetics of dye removal by MW-nZVI followed both an empirical equation and the pseudo first-order model, while the kinetics of dye removal using nZVI could only be described by an empirical equation. It was also concluded that microwave heating of the dye solutions as well as acceleration of corrosion of nZVI and consumption of Fe(II) were possible reasons behind the enhanced dye degradation.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionbenefit

PopulationNot supplied

Sample sizeNot supplied

Exposuremicrowave

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Microwave radiation combined with nanoscale zero-valent iron (MW-nZVI) achieved more rapid and efficient removal of Solvent Blue 36 and Reactive Yellow K-RN and greater TOC removal than nZVI alone across pH 5.0–9.0. Dye removal efficiency increased with decreasing pH and was reported to be negligibly affected by variation in microwave power; MW-nZVI kinetics fit both an empirical equation and a pseudo first-order model.

Outcomes measured

Removal/degradation of Solvent Blue 36
Removal/degradation of Reactive Yellow K-RN
Total organic carbon (TOC) removal
Kinetics of dye removal (empirical equation; pseudo first-order model)
Effect of pH on dye removal efficiency
Effect of microwave power on dye removal efficiency

Limitations

No microwave frequency, exposure metrics, or irradiation duration reported in the abstract.
No sample size/number of experiments reported in the abstract.
Mechanistic explanations are described as possible reasons rather than confirmed mechanisms.

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "microwave",
    "source": "microwave radiation (laboratory process)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Removal/degradation of Solvent Blue 36",
    "Removal/degradation of Reactive Yellow K-RN",
    "Total organic carbon (TOC) removal",
    "Kinetics of dye removal (empirical equation; pseudo first-order model)",
    "Effect of pH on dye removal efficiency",
    "Effect of microwave power on dye removal efficiency"
  ],
  "main_findings": "Microwave radiation combined with nanoscale zero-valent iron (MW-nZVI) achieved more rapid and efficient removal of Solvent Blue 36 and Reactive Yellow K-RN and greater TOC removal than nZVI alone across pH 5.0–9.0. Dye removal efficiency increased with decreasing pH and was reported to be negligibly affected by variation in microwave power; MW-nZVI kinetics fit both an empirical equation and a pseudo first-order model.",
  "effect_direction": "benefit",
  "limitations": [
    "No microwave frequency, exposure metrics, or irradiation duration reported in the abstract.",
    "No sample size/number of experiments reported in the abstract.",
    "Mechanistic explanations are described as possible reasons rather than confirmed mechanisms."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "nanoscale zero-valent iron",
    "nZVI",
    "MW-nZVI",
    "Solvent Blue 36",
    "Reactive Yellow K-RN",
    "dye degradation",
    "total organic carbon",
    "pH",
    "kinetics"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1016/j.jes.2014.09.030
PubMed: 25872723

Read the original paper →

Related papers

← Back to the Research Library