Anomalous but massive removal of two organic dye pollutants simultaneously

Zilin Meng, Yihe Zhang, Zhilei Zhang, Qian Zhang, Paul K. Chu, Sridhar Komarneni, Fengzhu Lv

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


A one-pot method to remove two organic dye contaminants and alkali simultaneously from alkaline wastewater was developed by forming Zn-Al layered double hydroxide (ZnAl-LDH). Using this process, not only alkali but also methyl orange (MO), an anionic contaminant was totally removed from wastewater. In addition, cationic contaminant, methylene blue (MB) was also removed effectively while maintaining the high removal efficiency of MO. The removal efficiency of MO was almost 100% and the pH of the treated wastewater decreased from 12 to 7.38. The charge-limited removal process, molecular arrangement of the contaminants in LDHs, and the anomalous removal mechanism were analyzed experimentally and through simulation. After MO accumulated in the interlayers of LDH by electrostatic interaction, MB entered and trapped by hydrophobic interaction.

Original languageEnglish (US)
Pages (from-to)54-60
Number of pages7
JournalJournal of Hazardous Materials
StatePublished - Nov 15 2016

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis


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