Adsorption of Lead (II) from Aqueous Solution with High Efficiency by Hydrothermal Biochar Derived from Honey

Abstract

A novel natural honey hydrothermal biochar (HHTB) was prepared using natural honey as raw material. The as-prepared adsorbent was applied to adsorb Pb2+ from aqueous solution and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy to investigate the structure and morphology change of the adsorbent before and after Pb2+ adsorption. The influence of the pH, initial Pb2+ concentration, temperature, and contact time on the adsorption of Pb2+ was systematically investigated. The results revealed that the adsorption capacity for Pb2+ is up to 133.2 mg·g−1 at initial pH of 5.0 and adsorption temperature of 298 K. Meanwhile, the adsorption of Pb2+ on HHTB can be well fitted by the pseudo-second-order model and Langmuir isotherm model. The adsorbent had great selectivity for Pb2+ from the aqueous solution containing coexisting ions including Cd2+, Co2+, Cr3+, Cu2+, Ni2+ and Zn2+. Furthermore, the adsorption of Pb2+ on HHTB was attributed to complexation coordination, where it involved hydroxyl and carboxylic groups on HHTB in the process of adsorption of Pb2+.

Synthesis of Magnesium hydroxide Whisker‐encapsulated Carbonized Chitosan and Basic Magnesium Carbonate Composite for Efficient Pb(II) Removal

“…In the Pb 2 + adsorbed BMC@Mg(OH) 2 /CCS spectrum, new peaks appear at 679 cm À 1 , corresponding to the in-plane/out-of-plane bending vibration of PbÀ CO 3 . [47,48] Additionally, the hydroxyl stretching vibration peak of MgÀ OH at 3700 cm À 1 is significantly weakened. However, the hydroxyl stretching vibration peak of MgÀ OH at 3700 cm À 1 did not change after Pb 2 + adsorption onto pure Mg(OH) 2 .…”

“…The effect of co-existing ions on the adsorption process of lead ions was studied. Figure 11b shows Mg(II) Fe(III) Cr(VI) has little effect on the adsorption of lead ions, while the presence [37] hybrid composite of fuller's earth, aluminum silicate and chitosan 305.5 [38] chitosan nanoparticles(z-Ch-Sal) 123.67 [39] AHTC-PL 74.5 [40] FSC-P 212.8 [41] modified biochar 145 [42] IC-EFBB 142.86 [43] BC@nHAP 335.88 [44] Musa X Paradisiaca 49.96 [45] HHTB 133.2 [46] BMC@Mg(OH) 2 /CCS 416.67 This work of Cu(II) affects the adsorption rate of lead about 30 %. This phenomenon may be related to mental activity.…”

Synthesis optimization and adsorption modeling of biochar for pollutant removal via machine learning

“…The physicochemical properties of biochar can be improved by modifying the surface of biochar with functional groups (Wang et al 2022b;Yang et al 2022b;Zuo et al 2021). Further, the experimental settings of adsorption process, such as adsorbent dosage , initial concentration of adsorbate (Dalhat et al 2021;Li et al 2020c), adsorption time, stirring speed (Jabar and Odusote 2021; Komnitsas et al 2017), pH, coexisting ions (Tang et al 2022;Wang et al 2020a) and temperature (Zeng et al 2018), have an important impact on adsorption efficiency. The adsorption performance of biochar is closely related to the synthesis and adsorption process of biochar, but there are many influencing factors.…”

The effect of biochar prepared at different pyrolysis temperatures on microbially driven conversion and retention of nitrogen during composting

“…Generally, biochar (BC) is a highly aromatic porous solid material with strong adsorption ability produced by pyrolysis of biomass waste at relatively low temperatures (<700 °C) [ 14 , 15 ]. In recent years, the application of biochar has become an emerging technology in environmental use.…”