Preparation of porous calcium carbonate biochar and its beryllium adsorption performance

Wastewater disposal from beryllium production has become a significant problem in the industry. Therefore, this paper designed porous calcium carbonate biochar (CC-LBC) using Na2CO3 and CaCl2 to modify the biochar innovatively, after which we understudied the Be(II) adsorption effect of CC-LBC at different concentrations. The results from Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and other characterization analyses showed that when CC-LBC particles were immersed in the Be(II) waste liquid, several O elements accumulated because of its loose and porous structure, generating more beryllium precipitates on the surface of the adsorbent. According to kinetic data fitting, in-vestigations also revealed that both physical and chemical reactions controlled CC-LBC/Be(II) adsorption pro-cess, indicating that the CC-LBC/Be(II) adsorption system is suitable for the intraparticle diffusion model. Furthermore, when the beryllium on activated carbon was desorbed by 10% NaOH, the desorption effect was above 80%, and the saturation adsorption capacity of CC-LBC for Be(II) was up to 55 mg/g. However, when the initial concentration of Be(II) was equal to 0.5-1 mg/L, the concentration of beryllium after treatment was lower than 10 & mu;g/L, confirming that CC-LBC had a better selective adsorption performance for beryllium in the binary system.

Automated summary

This study designed porous calcium carbonate biochar (CC-LBC) for wastewater treatment in beryllium production, and investigated the adsorption effect of CC-LBC on Be(II) at different concentrations. Results showed that CC-LBC exhibited a high adsorption capacity for Be(II) due to its loose and porous structure. Moreover, CC-LBC showed a better selective adsorption performance for beryllium in the binary system.