Adsorption performance and mechanism of iron-loaded biochar to methyl orange in the presence of Cr6+ from dye wastewater

Functionalized moso bamboo powder adsorbent for Cd(II) complexes with citric acid/tartrate acid: characterization, adsorptive performance, and mechanism

“…The value of R L reflects the trend of adsorption: irreversible (R L =0), favorable (0 < R L < 1), linear (R L =1), and unfavorable (R L > 1) [32]. In this experiment, the values of R L for both Cd(II)-CA and Cd(II)-TA were 0.12 and 0.05, respectively, indicating that the adsorption process was favorable.…”

“…The removal ratio increased with an increase in temperature from 5 to 45°C, which meant that the adsorption of Cd(II)-CA and Cd(II)-TA on the AMBP was an endothermic process. The Cd(II) removal increased with an increase in temperature, since the increased temperature could facilitate molecular motion and enhance the interaction between the adsorbate and the adsorbent [32]. Therefore, a better adsorption removal of the Cd(II) complexes with CA and TA was achieved by raising the adsorption temperature from 5°C to 45°C.…”

“…The Langmuir and Freundlich models were used to simulate the isotherms data. The Langmuir model expression is the following [32]:…”

Efficient recovery of Cr(vi) from electroplating wastewater by iron-modified sludge-based hollow-structured porous carbon: coexistence effects and competition for adsorption

“…The liriodendron leaf and sewage sludge samples have been used for biochar production in previous studies. 30 All the samples were washed in deionized water before being dried for 12 h at 110 C. They were subsequently crushed and sieved into a powder with a particle size of less than 300 mm, with the powder then kept in plastic bags. NaOH (0.1 mol L À1 ) or HCl (0.1 mol L À1 ) were used to alter the pH of the solution.…”

“…1(a). 30 The dried sludge and liriodendron leaves (2 : 3, m/m) were combined in a beaker with a volume of 250 mL and subsequently impregnated in a 3 mol L À1 solution of ZnCl 2 (ZnCl 2 : raw material ¼ 3 : 1, m/m) for 24 h at 25 C. Aer mixing, the slurry was centrifuged for 6 min at 3000 rpm before being vacuum dried for 8 h at 110 C. For maintaining the oxygen-depleted circumstances, the specimens were wrapped by three layers of tin foils, and next they were pyrolyzed in a muffle furnace for 45 min at 550 C (heating rate of 5 C min À1 ). With the help of deionized water and a solution of 1 mol L À1 HCl, the considered porous carbon was washed many times until the pH was neutral.…”