笼芯陶黑碳微珠去除模拟废水中铬

将笼芯陶黑碳微珠用于水溶液中铬的吸附去除，探讨了溶液初始pH、初始浓度、吸附温度、吸附时间、竹炭添加量对铬去除的影响，分析了铬去除的等温过程、动力学和热力学。结果表明:较低的溶液初始pH、较高的吸附温度、较长的吸附时间和较大的笼芯陶黑碳微珠添加量有利于铬的吸附去除；铬的去除更符合D-R模型和准二级动力学模型，其饱和吸附量可达到30.62 mg/g；铬去除过程的控速步骤为液膜扩散和颗粒内扩散联合控制，但以液膜扩散为主导；笼芯陶黑碳微珠对铬的去除是自发的、吸热的、以化学吸附为主的过程。

EXPERIMENTAL STUDY ON Cr REMOVAL FROM SIMULATED WASTEWATER BY CAGE CORE BLACK CARBON BEADS

The cage core black carbon beads were used to remove Cr in aqueous solution. The effects of initial pH and Cr concentration, adsorption time and temperature and adsorbent dosage on Cr removal were discussed, while the isotherm, kinetics and thermodynamics of Cr removal process were also studied. The results showed that lower initial pH, higher adsorption temperature and adsorbent dosage, and longer adsorption time were conducive to Cr removal. The Cr removal process was better described by D-R model and pseudo-second order kinetic model. The saturated adsorption capacity of bamboo based biochar for Cr was 30.62 mg/g. The controlling-step of this process was combination of liquid film diffusion and intraparticle diffusion, while the liquid film diffusion was the dominant course. The Cr removal by cage core black carbon beads made from bamboo was a spontaneous and endothermic chemisorption process.