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Date palm ash-MgAl-layered double hydroxide composite: sustainable adsorbent for effective removal of methyl orange and eriochrome black-T from aqueous phase

Blaisi, Nawaf I., Zubair, Mukarram, Ihsanullah,, Ali, Sadaqat, Kazeem, Taye Saheed, Manzar, Mohammad Saood, Al-Kutti, Walid, Al Harthi, Mamdouh A.
Environmental science and pollution research international 2018 v.25 no.34 pp. 34319-34331
Fourier transform infrared spectroscopy, Phoenix dactylifera, X-ray diffraction, adsorbents, adsorption, coprecipitation, decontamination, dyes, methyl orange, models, scanning electron microscopes, scanning electron microscopy, sorption isotherms, surface area, wastewater
Date palm ash (DPA) and MgAl-layered double hydroxide (LDH) composites were synthesized by the co-precipitation method and characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET). The DPA-MgAl-LDH (DPA/MgAl) composites were employed for the removal of methyl orange (MO) and eriochrome black-T (EBT) from aqueous phase. Incorporation of 33.33% (w/w) DPA into the layers of MgAl increased the surface area from 44.46 to 140.65 m²/g, which leads to the improved adsorption performance. The maximum adsorption capacity of DPA/MgAl (1:2) at 298 K was 242.98 and 425.16 (mg/g) for MO and EBT, respectively. The adsorption data of dyes were adequately fitted by a pseudo-second-order and Langmuir isotherm model. The composite showed excellent reusability performance up to three cycles. Addition of DPA into MgAl-LDH resulted in an effective low-cost adsorbent for decontamination of dyes from wastewater. Graphical abstract ᅟ