التفاصيل البيبلوغرافية
| العنوان: |
Composite Sorbent Prepared from Layered Double Hydroxide Nanoparticles to Remediate Simulated Groundwater Polluted with Lead and Cadmium Ions. |
| المؤلفون: |
Hussein, Teba S., Faisal, Ayad A. H. |
| المصدر: |
Mathematical Modelling of Engineering Problems; Oct2023, Vol. 10 Issue 5, p1573-1586, 14p |
| مصطلحات موضوعية: |
LAYERED double hydroxides, LEAD, PERMEABLE reactive barriers, GROUNDWATER remediation, SOIL pollution, GYPSUM, CADMIUM |
| مستخلص: |
This study presents a novel composite sorbent, synthesized from industrially inexpensive and abundant materials, designed for the remediation of groundwater contaminated by lead (Pb) and cadmium (Cd) ions through a permeable reactive barrier (PRB) technique. The synthesis process innovatively employs alum, a low-cost compound, alongside plaster kiln dust — a by-product waste from the gypsum industry — and Cetyl trim ethyl ammonium bromide (CTAB), to produce Nano-sized layered double hydroxide (LDH) composed of aluminum (Al+3) and calcium (Ca+2) ions. The synthesized LDH gel-solution was characterized using X-ray diffraction (XRD) analysis and subsequently intercalated onto an iron-slag surface, yielding a novel sorbent termed "iron-slag coated with (Ca/Al-CTAB)-LDH". The intercalation of CTAB and the presence of LDH nanoparticles significantly increased the iron-slag surface area from 0.48802 to 10.21 m² /g, thereby enhancing the adsorption capacity of the sorbent for Pb and Cd ions. Optimal synthesis parameters were identified as 0.035 g/50 mL CTAB, pH 10, (Ca/Al) molar ratio of 2, and an iron-slag dosage of 1 g/50 mL. Long-term column tests, spanning a duration of at least 25 days, were conducted, revealing a marked increase in the sorbent's longevity in the packed column when a low flow rate and inlet concentration of contaminants were combined with a high mass of sorbent. The experimental data from the breakthrough curves were successfully fitted by several models, including Bohart-Adams, Thomas-BDST, Yan, Belter-Cussler-Hu, and Clark expressions, with a determination coefficient (R2) exceeding 0.99 and a sum of squared errors (SSE) less than 0.162. The hydraulic conductivity of the packed sorbent remained largely constant at 2.7×10-2 cm/s, suggesting its suitability for PRB applications. The prepared sorbent demonstrated high efficacy in the removal of Pb and Cd ions from contaminated water, making it a promising tool for environmental remediation. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
