Amino modification of rice straw-derived biochar for enhancing its cadmium (II) ions adsorption from water

Mild hydrothermally treated brewer's spent grain for efficient removal of uranyl and rare earth metal ions

“…In contrast, rapid adsorption is observed in the rst 30 minutes for of all four ions employing ABSG and the equilibrium is reached aer 1 h. This behavior indicates that adsorption occurs mainly on the outer surface of ABSG with large amounts of adsorption sites. 59 For both adsorbents, the correlation coefficients (R 2 ) of PSO model are higher than those of PFO model, and the calculated equilibrium adsorption capacity (q e,cal , mg g À1 ) agrees to a larger extend to the experimental equilibrium adsorption capacity (q e,exp , mg g À1 ). For example, the R 2 using the PSO model to t the UO 2 2+ onto ABSG adsorption data is 0.9996, which is higher than the R 2 of the PFO model (0.9955).…”

“…The obtained results are tted using pseudo-rst-order kinetic (PFO) model and pseudo-second-order kinetic (PSO) model as shown in Table 1. 59 For BSG, the equilibrium time increases as the adsorption capacity of studied metal ions increases, especially in the case of UO 2 2+ , 2 h is required to complete the adsorption process. In contrast, rapid adsorption is observed in the rst 30 minutes for of all four ions employing ABSG and the equilibrium is reached aer 1 h. This behavior indicates that adsorption occurs mainly on the outer surface of ABSG with large amounts of adsorption sites.…”

Cadmium cation uptake through amine and acid post‐functionalized Santa Barbara Amorphous materials; comprehensive adsorption studies

“…So, the adsorption of cadmium is followed by the pseudo‐second‐order kinetic model, and the assumption of rate controlling by chemical sorption is satisfied. Cadmium removal from aqueous solution using guanine‐functionalized mesoporous silica [SBA‐16‐g], 56 the adsorption of cadmium ions (Cd (II)) from the synthesis wastewater with the activated carbon 69 and cadmium (II) ions adsorption from water by amino modification of rice straw‐derived biochar 70 are some adsorption process that pseudo‐second order kinetic model are the predominant kinetic model during cadmium adsorption. A linear form of intra‐particle diffusion model is divided into two straight lines indicating boundary layer effects and metal ion penetration into the pores of the adsorbent which is co‐called the intra‐particle diffusion 56 .…”

Uso del biocarbón como material alternativo para el tratamiento de aguas residuales contaminadas

“…Por otro lado, [54] modificaron el biocarbón derivado del arroz mediante la nitración y la nitroreducción para mejorar la adsorción de iones de Cd(II) presentes en el agua. Para ello, añadieron 50 mL de ácido nítrico (HNO3) y 50 mL de ácido sulfúrico (H2SO4) y se colocó en un baño de sal y hielo.…”

“…Estas partículas podrían ser quelatos de Cd formados después de la adsorción por parte del biocarbón, y podrían indicar que los grupos -NH2 en la superficie del biocarbón modificado tendrían la capacidad de acomplejarse con el Cd(II). Este proceso sería el responsable del aumento en un poco más del 72% de la capacidad de adsorción del biocarbón [54].…”