Iron/manganese binary metal oxide-biochar nano-composites with high adsorption capacities of Cd2+: Preparation and adsorption mechanisms

Interpretation of the adsorption process of toxic Cd2+ removal by modified sweet potato residue

“…In the study of the adsorption of Cd 2+ by iron/manganese binary metal oxide-biochar nanocomposites, the R 2 of the pseudo-second-order fitting equation was found to be greater than the first, which indicated it belonged to chemical adsorption, less than physical adsorption. 54 The higher R 2 of the pseudo-second-order model indicated that MSPR in contact with Cd 2+ is a chemical adsorption process, and the adsorption rate is determined by the concentration of Cd 2+ and the amount of adsorbent.…”

Adsorption of anionic and cationic heavy metals by Zn-Mn-Fe oxide-loaded biochar: Performance and mechanism

“…According to the tting results of the adsorption data of the four isothermal adsorption models, the adsorption types of the three heavy metals by ZMFBC are similar. The R 2 of the Langmuir model (Pb 2+ : 0.9987, 0.9956, 0.9968; Cd 2+ : 0.9788, 0.9985, 0.9792; Cr 6+ : 0.9993, 0.9990, 0.9945) were greater than the R 2 of the other isotherm models, indicating that the Langmuir model is more suitable for simulating the Pb 2+ , Cd 2+ , Cr 6+ adsorption processes of ZMFBC and that these processes involved monolayer adsorption(Qu et al 2023). The ZMFBC theoretical maximum Pb 2+ , Cd 2+ and Cr 6+ adsorption amounts calculated by the Langmuir model are 136.99 mg/g, 74.63 mg/g and 39.06 mg/g, respectively.…”

Utilization of biochar for remediation of heavy metals in aqueous environments: A review and bibliometric analysis

“…Pristine biochar is less effective in removing water pollutants than activated carbon because it has a lower surface area and fewer functionalities. Usually, unmodified biochar has a low specific surface area and pore volume, resulting in low adsorption capacity [119] , [120] , [121] . The stability of biochar under certain conditions, such as elevated temperature, pressure, and pH, can limit its application [118] , [122] .…”

“…The stability of biochar under certain conditions, such as elevated temperature, pressure, and pH, can limit its application [118] , [122] . Typically, unmodified biochar exhibits limited effectiveness, but various activation techniques increase surface functional groups, leading to heightened reactivity toward contaminants [121] , [123] . It also exhibits being ineffective in the removal of particular contaminants [27] , [124] , [125] .…”

“… Peanut shell 600 c CTAB Cr 6+ 23.03 14.04 14.56 27.05 Murad et al [139] 5a. Cotton straw (JX) 500 BM/FeSO 4 /KMnO 4 Cd 2+ 14.02 226.50 12.9 65.3 Qu et al [121] 5b. Cotton straw (CB) 500 BM/FeSO 4 /KMnO 4 Cd 2+ 19.13 268.85 16.5 87.2 5c.…”