Insights into boron removal from water using Mg-Al-LDH: Reaction parameters optimization & 3D-RSM modeling

Osama Eljamal, Ibrahim Maamoun, Sami Alkhudhayri, Ramadan Eljamal, Omar Falyouna, Kazuya Tanaka, Naofumi Kozai, Yuji Sugihara

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

In this study, calcined Mg-Al layered double hydroxide (Mg-Al-CLDH) was successfully synthesized for boron (B) removal from aqueous solutions. Batch experiments were conducted considering various reaction conditions, including initial pH, reaction temperature, initial B concentration, Mg-Al-CLDH dosage, ambient condition, and co-existing ions effect, for optimizing B removal efficiency. Results showed that sorption kinetic rate became higher by approaching towards the neutral pH conditions, while it declined at the strong acidic or alkaline conditions. Mg-Al-CLDH was capable of removing high B concentration (80 mg/L) from aqueous solutions at a reasonable dosage of 2 g/L, with a comparable sorption capacity (22.1 mg/g) to other reported studies. Moreover, high B removal rates were observed at high reaction temperatures, reflecting the endothermic nature of the reaction, and reached equilibrium within less than 6 h at temperature of 70 °C. Moreover, results of 3D-RSM modeling confirmed that the middle-high range of Mg-Al-CLDH dosage values was the suitable range to achieve high B removal efficiency, in spite of pH, temperature, and initial concentration effects. Furthermore, isotherm modeling confirmed that B removal by Mg-Al-CLDH occurred via a mono-layer sorption, and thermodynamic modeling revealed the positive value of entropy change, indicating that the randomness of the solid/liquid interaction increased within the adsorption process of B. Spent Mg-Al-CLDH showed great reusability performance by achieving 67%–75% B removal efficiency over three consecutive regeneration cycles, confirming the high potential and applicability of the presented adsorbent in real water treatment applications.

Original languageEnglish
Article number102608
JournalJournal of Water Process Engineering
Volume46
DOIs
Publication statusPublished - Apr 2022

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Process Chemistry and Technology

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