A composite of Ni–Fe–Zn layered double hydroxides/biochar for atrazine removal from aqueous solution

Abstract

This study assembled corn stalk-derived biochar (BC) with layered double hydroxide (LDH) through a rapid coprecipitation of biochar and metal (Ni/Fe/Zn) hydroxide precipitates. A BC and LDH composite (BC-LDH) and modified BC-LDH material after heating (BC-LDH-P) were prepared successfully for atrazine adsorptive removal. The physicochemical properties of the synthesized samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), and X-ray photoelectron spectroscopy (XPS). Batch experiments were conducted to study the sorption of atrazine onto BC, BC-LDH, and BC-LDH-P from the aqueous solution. The adsorption of atrazine onto BC-LDH and BC-LDH-P were performed following with the pseudo-second-order kinetic model, and the sorption isotherms agreed well with the Freundlich fitting model. The adsorption amounts of the three materials are arranged in descending order is as follows: BC-LDH-P > BC-LDH > BC (143.15 > 123.10 > 95.93 mg g −1 , respectively). Due to the high crystallinity of the LDH material and the high binding degree with biochar, Ni/Fe/Zn-LDH biochar composites offer a potential alternative to a carbon-based adsorbent for atrazine removal from aqueous solution.

Egg White-Mediated Fabrication of Mg/Al-LDH-Hard Biochar Composite for Phosphate Adsorption

“…Specifically, the broad band at 3453 cm −1 and the weak band at 1600 cm −1 of L-AE and L-A, assigned to the O-H stretching and bending vibrations of the interlayer water molecules and hydroxyl groups in the materials structures [32], became much stronger than that of ASB. The absorption peak at 1438 cm −1 related to the asymmetric stretching of the CO3 2− was weakened [33] Furthermore, with or without egg white also led to the difference in their FTIR spectra, as shown in Figure 4. Specifically, the broad band at 3453 cm −1 and the weak band at 1600 cm −1 of L-A E and L-A, assigned to the O-H stretching and bending vibrations of the interlayer water molecules and hydroxyl groups in the materials structures [32], became much stronger than that of ASB.…”

Recent advances on sustainable removal of emerging contaminants from water by bio-based adsorbents

“…Findings of XPS examination of AZ adsorption on corn stalk biochar, NiFeZn-LDH modified corn stalk biochar (NiFeZn-LDH/BC), and NiFeZn-LDH modified corn stalk biochar after heating at 600 1C (NiFeZn-LDH/BC-P) are reported. 115 The XPS examination reveals that the maxima shifted slightly post adsorption. After adsorption, the CO 3 2À peaks of the NiFeZn-LDH/BC and NiFeZn-LDH/BC-P are significantly distinct, showing that carbonates play a fundamental role in the adsorption process.…”

“…131 As a result, the CO 3 2− comprising additional C–O bonds and π–π bond relationship with AZ are the contributing factors to AZ elimination in the adsorption mechanism. 115…”

“…Furthermore, AZ degrades and lowers the C-O structure, resulting in a higher M-O-M. 131 As a result, the CO 3 2À comprising additional C-O bonds and p-p bond relationship with AZ are the contributing factors to AZ elimination in the adsorption mechanism. 115…”

Hygroscopic Water Retention and Physio-Chemical Properties of Three In-House Produced Biochars from Different Feedstock Types: Implications on Substrate Amendment in Green Infrastructure

“…However, different studies have investigated the use of biochar as a substrate amendment to optimize the performance of green infrastructure [5]. Several studies have promoted the use of biochar as an amendment in substrate materials in green infrastructure [6][7][8]. This is mainly due to three factors: firstly, the large specific surface area and porous structure results in enhanced adsorption performance and water retention behavior [9][10][11][12].…”