Synthesis of magnetic biochar from iron sludge for the enhancement of Cr (VI) removal from solution

Adsorption Mechanism of Hexavalent Chromium on Biochar: Kinetic, Thermodynamic, and Characterization Studies

“…There are many methods to reduce Cr 6+ contamination, such as chemical precipitation, membrane separation, adsorption, and so on. 7 − 9 Among them, adsorption has attracted increasing attention because of its simple, low-cost, and high-efficiency characteristics.…”

Adsorption of Hexavalent Chromium Using Banana Pseudostem Biochar and Its Mechanism

“…Biochar, a cost-effective and green carbon material prepared from biomass through thermal conversion in an oxygen deficient environment [18,19], has been widely used to remove or immobilize Cr(III) and Cr(VI) due to their large specific surface area, high porosity and abundant functional groups on surface [20,21]. As the adsorption capabilities of biochar are significantly affected by biomass types [20,21], a series of biomass including oak wood, oak bark [22], ramie [23], cotton stalk [24], beet tailing [25], coconut coir [26], leaf of Leersia hexandra Swartz [27] and so on have been employed to make biochars by pyrolysis at different temperatures for removal of hexavalent chromium in the past decades. The adsorption capability of these biochars ranged from 3.03 mg/g to 349.81 mg/g, depending on the biomass feedstock.…”

Enhancing the adsorption capability of areca leaf biochar for methylene blue by K2FeO4-catalyzed oxidative pyrolysis at low temperature

“…This was opposed to other reports. [31][32][33] Comparing to the corresponding pristine biochar, the modied biochar was much richer in aliphatic C-O and COOH groups as pyrolyzed at 200 C. The aliphatic C-O groups of modied biochar decreased but no aromatic rings formed while increasing pyrolysis temperature. Moreover, strong peaks of C]O around 1634 cm À1 were always observed for the modied biochar.…”