改性多孔兰炭末吸附处理模拟含铬废水

以低值兰炭末为原料，通过酸洗和微波活化制备了改性多孔兰炭末(MA-BC),并对其吸附处理模拟含Cr(Ⅵ)废水进行了实验研究。采用SEM、N₂吸附-脱附测试和FT-IR等分析表征手段对比分析了改性前后兰炭末表面形貌、结构和官能团组成变化。在吸附处理模拟含Cr(Ⅵ)废水实验中，分别考察了MA-BC投加量、模拟废水pH、初始Cr(Ⅵ)浓度、吸附时间对模拟废水中Cr(Ⅵ)去除效果的影响，并对模拟废水中Cr(Ⅵ)吸附过程进行了动力学和热力学分析。结果表明：经酸洗微波加热活化处理的兰炭末比表面积增大到160.69 m²/g,改性后兰炭末表面的—OH、■和—CH₃等官能团含量明显增加。在模拟废水Cr(Ⅵ)初始浓度为100 mg/L,pH为2,MA-BC投加量为2 g,吸附时间210 min的最佳工艺条件下，模拟废水中Cr(Ⅵ)去除率可达到89.21%。该吸附过程以化学吸附为主，服从准二级动力学方程，并符合Langmuir吸附等温线模型，理论吸附量为6.255 mg/g,与实验所测的平衡吸附量相吻合。吸附饱和的改性多孔兰炭末经5次循环再...

ADSORPTION TREATMENT OF SIMULATIVE WASTEWATER CONTAINING CHROMIUM BY MODIFIED POROUS BLUECOKE POWDER

Using low-value blue coke as the raw material, modified porous bluecoke (MA-BC) was prepared by acid washing and microwave activation, and an experimental study on its adsorption treatment of simulated Cr(Ⅵ)-containing wastewater was carried out. The surface morphology and structure and functional groups of the bluecoke powder before and after the modification were compared and analyzed by BET, SEM, N₂ adsorption-desorption test, and FT-IR. In the treatment of the simulated Cr(Ⅵ)-containing wastewater, the dosage of MA-BC, simulated wastewater pH, initial concentration of Cr(Ⅵ), and adsorption time were investigated respectively, and the thermodynamics and kinetics for the adsorption process of Cr(Ⅵ) were analyzed. The results showed that the specific surface area of activated bluecoke powder by acid washing and microwave heating increased to 160.69 m2/g, and the content of functional groups, -OH, C=C and -CH₃ on the surface of MA-BC significantly increased. Under the optimal process condition that the initial concentration of Cr(Ⅵ) in the simulated wastewater was 100 mg/L, pH was 2, the MA-BC dosage was 2 g, the adsorption time was 210 min, and then the removal rate of Cr(Ⅵ) could reach 89.21%. The main adsorption process belonged to the chemical adsorption, which obeyed the pseudo-second-order kinetic equation and conformed to the Langmuir adsorption isotherm model. The theoretical adsorption capacity was 6.255 mg/g, which was consistent with the equilibrium adsorption capacity of the experiment. After 5 cycles of regeneration and adsorption, the removal rate of Cr(Ⅵ) in simulated wastewater absorbed by MA-BC remained 80% above.