Highly adsorptive pristine and magnetic biochars prepared from crayfish shell for removal of Cu(II) and Pb(II)

Functional surface homogenization of nanobiochar with cation exchanger for improved removal performance of methylene blue and lead pollutants

“…A series of sustainable banana peel biochars were synthesized using pyrolytic method at temperature 450-750 °C and additionally applied for sorption of acetaminophen and ciprofloxacin drugs under different optimized parameters [13]. Other pristine biochars were also investigated and reported for adsorptive removal of organic and inorganic pollutants from wastewater [14][15][16][17] The low removal capability of biochar materials under specific aqueous conditions for some selected contaminants represents one of the major disadvantages with respect to application for removal of diversiform contaminants. Therefore, this problematic issue was found to limit the utilization of pristine biochars compared to the removal ability of modified ones, especially in high ionic strength wastewater [18].…”

Layered Double Hydroxides for Regulating Phosphate in Water to Achieve Long-Term Nutritional Management

“…Filtration and centrifugation are the most common techniques to separate the adsorbent from the aqueous solution, which limits the scalable practices in real water. , Therefore, the magnetic separation technology has arisen broad interest, which can easily separate the adsorbents from the solution by applying the external magnetic field . To tackle this bottleneck, the combination of magnetic Fe 3 O 4 nanoparticles with LDH has been proposed to effectively remove adsorbents from the aqueous solution after the phosphate adsorption process. , Fe 3 O 4 has been considered a promising adsorbent due to its superparamagnetic properties, durability, low toxicity, low cost, high biocompatibility, chemical stability, and large surface area . Yan et al prepared ZnAl-LDH/Fe 3 O 4 composite with a core–shell structure for phosphate adsorption with easy magnetic separation …”

“… 40 , 155 Fe 3 O 4 has been considered a promising adsorbent due to its superparamagnetic properties, durability, low toxicity, low cost, high biocompatibility, chemical stability, and large surface area. 156 Yan et al prepared ZnAl-LDH/Fe 3 O 4 composite with a core–shell structure for phosphate adsorption with easy magnetic separation. 157 Figure 8 a illustrates the synthesis mechanism of Fe 3 O 4 @LDH composites through the electrostatic attraction between the positive metal cations and negatively charged functional groups on the ferric oxide surface.…”

Oxidative Magnetic Modification of Pristine Biochar Assisted by Ball-Milling for Removal of Methylene Blue and Tetracycline in Aqueous Solution

“…A similar result was also achieved for the adsorption of them at high concentrations (MB: 500 mg/L, TC: 150 mg/L) by OMB. The adsorption data could be suitably simulated by Thomas and Yoon-Nelson models [10,35] (see Supplementary Materials). The maximum adsorption capacities of OMB calculated by the Thomas model were much larger than that of PB.…”

“…CaCO 3 -impregnation was utilized to enhance the adsorption capability of magnetic biochar for As (III) and Cd (II) [9]. Similarly, calcium-based magnetic biochar was also prepared for efficiently adsorbing other heavy metals (Pb (II), Cu (II), and Cr (VI)) using calcium-rich feedstock such as iron sludge [10] and crayfish shell [11]. Chitosan-crosslink was also developed to engineer magnetic biochar for the removal of various heavy metals [12], where the multiple functional groups of chitosan played an important role in the adsorption.…”