Multifunctional hierarchical cabbage-like nZVI-Fe 3 O 4 /C composites for efficient chromium (VI) removal

Fabrication of Iron-Containing Biochar by One-Step Ball Milling for Cr(VI) and Tetracycline Removal from Wastewater

“…According to the IUPAC classification, MBC and Fe@MBC exhibit type II isotherms, which are typical characteristics of mesoporous solids. 60 The isothermal curves of MBC and Fe@ MBC both showed typical H4 type hysteresis loops, indicating that a large number of mesoporous structures were formed in the samples. Figure 2e is the pore size distribution diagram of BC, MBC, and Fe@MBC.…”

“…The N 2 adsorption–desorption isotherms of BC, MBC, and Fe@MBC are shown in Figure d. According to the IUPAC classification, MBC and Fe@MBC exhibit type II isotherms, which are typical characteristics of mesoporous solids . The isothermal curves of MBC and Fe@MBC both showed typical H4 type hysteresis loops, indicating that a large number of mesoporous structures were formed in the samples.…”

Macadamia nutshells-derived activated carbon and attapulgite clay combination for synergistic removal of Cr(VI) and Cr(III)

“…Effect of pH. It has been shown that the removal of chromium (VI) by adsorbents could be through adsorption and/or reduction (Li et al, 2017;Lv et al, 2016) with pH playing a significant role. The influence of pH on the adsorption of chromium by the MAC-clay is depicted in Figure 3.…”

“…Chiefly, it has been shown that clays can be cost-effective adsorbents for the removal of heavy metals from acid mine drainage samples (Rios et al., 2008). Numerous studies have reported the transformation of Cr(VI) to Cr(III) during adsorption (Li et al., 2017; Lv et al., 2016; Pakade et al., 2016a; Stoica-Guzun et al., 2016; Tang et al., 2014; Yang and Chen, 2008), but no attempt was made to remove the formed Cr(III). Therefore, the current study attempts to use cationic clay (attapulgite clay which is a magnesium aluminium silicate rich clay) for the removal of the formed Cr(III) while AC will be responsible for the removal of Cr(VI) and reduction.…”

Insights into the Mechanism of Efficient Cr(VI) Removal from Aqueous Solution by Iron-Rich Wheat Straw Hydrochar: Coupling DFT Calculation with Experiments

“…Chemical modification of hydrochar using a metal salt has been explored as a promising method to enhance the adsorption capacity of Cr­(VI). The low metal toxicity and high redox activity of iron-based materials, such as iron oxides, magnetic iron, zerovalent iron, make them ideal for heavy metal remediation . FeCl 3 is a frequently used chemical reagent that has a high buffering capacity can activate carbon materials and increasing functional groups and porosity .…”