Enhanced removal performance by the core-shell zeolites/MgFe-layered double hydroxides (LDHs) for municipal wastewater treatment

Abstract

The application of powdered layer double hydroxides (LDHs) in constructed rapid infiltration system (CRIS) appears to be an appreciable problem still unsolved due to the small particle size and the low density. Therefore, the core-shell zeolites/MgFe-LDHs composites were prepared via using co-precipitation method in present study. To investigate the practical applicability, a detailed organics, ammonia, and total phosphorus removal study were carried out in columns to treat the municipal wastewater. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) results confirmed the successful synthesis of core-shell zeolites/MgFe-LDHs through coating on the surface of zeolites. Accordingly, the zeolites/MgFe-LDHs largely reduced the COD by 81.14 %, NH4 (+)-N by 81.50%, and TP by 83.29%. Phosphate adsorption study revealed that the equilibrium adsorption data were better fitted by Langmuir isothermal model, with the maximum adsorption capacity of 79.3651 mg/kg for zeolites/MgFe-LDHs and 38.4615 mg/kg for the natural zeolites. In addition, economic analysis indicated that the reagent cost of synthesis of zeolites/MgFe-LDHs was economical. Herein, the zeolites/MgFe-LDHs solved the natural zeolites problem for poor P removal and the application of powdered LDHs in the solid/liquid separation process, suggesting that it was applicable as potential substrates for the removal of organics, ammonia, and total phosphorus in CRIS.

Enhancement of exchangeable Cd and Pb immobilization in contaminated soil using Mg/Al LDH-zeolite as an effective adsorbent

“…The Mg/Al LDH-zeolite was synthesized using the co-precipitation method. 40 In a 400 mL beaker, 100 mL of solution containing 0.01 mol of Al(NO 3 ) 3 and 0.02 mol of Mg(NO 3 ) 2 was mixed with a certain amount of zeolite which was calculated according to the LDH/zeolite ratio of 3 : 7 and solution pH was adjusted to 11 using the 1 M NaOH and 0.5 M Na 2 CO 3 solution. The mixture was then heated to 80 °C and kept at this temperature for 4 h. Mg/Al LDHs was formed by the reaction of Mg 2+ , Al 3+ , OH − , and CO 3 2− ions.…”

Novel synthesis of Ni/Fe layered double hydroxides using urea and glycerol and their enhanced adsorption behavior for Cr(VI) removal

“…Layered ) in the interlayer region and x is the molar ratio of M 2+ /(M 2+ + M 3+ ). The potential of layered double hydroxides (anionic clays) as promising adsorbent materials recognized mainly in water remediation applications to their interlayer anion exchange capacity, high specific surface area, low cost, high tunable interior structure and low toxicity properties [34][35][36] . The combination of Layered double hydroxides with other organic or inorganic materials in composite causes enhancement in adsorption capacity and the surface properties to be suitable for the removal process 34 .…”

Sewage Sludge ZnCl2-Activated Carbon Intercalated MgFe–LDH Nanocomposites: Insight of the Sorption Mechanism of Improved Removal of Phenol from Water

“…LDH hybridization, i.e., the coupling or decoration of LDH layers into various materials, including carbon materials (graphene, carbon nano tube (CNT), biochar), polymers (starch and chitosan, etc. ), and others, resulted in extremely promising materials, exhibiting enhanced surface and structure characteristics [18,19]. Recently, several LDHs and its hybrids have been explored for the removal of phenols from water bodies.…”