【摘要】 目的研究酸改性活性炭对水中C(rⅥ)的吸附效果。方法分别采用不同酸种类(硝酸、硫酸和磷酸)、酸浓度(10%,30%,50%)、改性时间(2、4、6 h)和改性温度(20、40、60℃)对活性炭材料表面进行改性处理,采用正交试验测定活性炭改性前、后对水中C(rⅥ)的吸附效果。结果酸改性活性炭对水中C(rⅥ)吸附效果能力的影响程度依次为酸种类>酸浓度>改性时间>改性温度。在最佳条件(于60℃、以10%硫酸氧化4 h)下,酸改性活性炭对水中C(rⅥ)的吸附率为77.63%,较改未性活性炭(53.02%)有所提高。结论酸改性活性炭对水中C(rⅥ)有较好地吸附效果。更多还原

【Abstract】 Objective To study the adsorption of Cr(Ⅵ) by acid-modified activated carbons.Methods Activated carbons were modified under different conditions,such as acids species(nitric acid,sulfuric acid,phosphoric acid),acid concentration(10%,30% and 50%),modification time(2,4 and 6 h) and temperature(20,40 and 60 ℃).The adsorption of Cr(Ⅵ) on original and modified activated carbons were analyzed by orthogonal experiment.Results Adsorption efficiency of activated carbons for Cr(Ⅵ) ranked as following: acids species >acid’s concentration >modification time >modification temperature.Under the optimum conditions,such as 10% sulfuric acid,adsorption at 60 ℃ for 4 h,the maximum removal efficiency of Cr(VI) was 77.63% which was higher than the unmodified activated carbon(53.02%).Conclusion The modified activated carbons have a favorable adsorbing effect on Cr(Ⅵ).更多还原