Study on adsorption properties of coconut shell activated carbon modified by HNO3 and γ-Fe2O3
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摘要: 为了提高活性炭的吸附性能, 对市售椰壳活性炭进行硝酸改性和负载γ-Fe2O3催化剂改性。对改性前后的椰壳活性炭分别进行了碘值吸附和亚甲基蓝吸附实验, 结果表明: 硝酸改性和负载γ-Fe2O3催化剂改性后椰壳活性炭的碘吸附值分别提高了16.1%和39.3%;硝酸改性后椰壳活性炭的亚甲基蓝吸附值提高了10.7%, 负载γ-Fe2O3催化剂改性椰壳活性炭的亚甲基蓝吸附值降低了3.5%。两种改性方法对椰壳活性炭的总体吸附能力都有所增强, 其中负载γ-Fe2O3催化剂改性椰壳活性炭总体吸附能力强于硝酸改性椰壳活性炭。本研究结果可为活性炭治理钢铁企业烧结烟气中的SO2和NOx提供借鉴。Abstract: The modification by nitric acid and loaded γ-Fe2O3 catalyst was performed to the commercially available coconut shell activated carbon to improve the adsorption performance of activated carbon. The iodine adsorption and methylene blue adsorption experiments were carried out on the coconut shell activated carbon before and after modification. The results show that, the iodine adsorption value of the coconut shell activated carbon by nitric acid and loaded γ-Fe2O3 catalyst increases by 16.1% and 39.3%, respectively. The methylene blue adsorption value of activated carbon increases by 10.7% after the nitric acid modification, and this value decreases by 3.5% after the loaded γ-Fe2O3 catalyst modification. Both of the two modification methods enhance the overall adsorption capacity of coconut shell activated carbon. The total adsorption capacity of coconut shell activated carbon modified by γ-Fe2O3 catalyst is stronger than that of nitric acid modification. The research results can provide the reference for the treatment of SO2 and NOx in the sintering flue gas of iron and steel enterprises by activated carbon.
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图 1 硝酸改性椰壳活性炭制备流程
Figure 1. Preparation process of coconut shell activated carbon modified by nitric acid
图 2 γ-Fe2O3改性椰壳活性炭制备流程
Figure 2. Preparation process of coconut shell activated carbon modified by γ-Fe2O3
图 3 改性前后椰壳活性炭碘吸附值
Figure 3. Iodine adsorption value of coconut shell activated carbon before and after modification
图 4 改性前后椰壳活性炭亚甲基蓝吸附值
Figure 4. Methylene blue adsorption value coconut shell activated carbon before and after modification
表 1 活性炭比表面积和孔结构参数
Table 1. Specific surface area and pore structure parameters of activated carbon
样品 St / (m2∙g-1) Sm / (m2∙g-1) Vt / (cm3∙g-1) Vm / (cm3∙g-1) VM / (cm3∙g-1) D / nm AC 786.69 655.84 0.383 0.268 0.115 2.3 N/AC 653.05 465.25 0.393 0.188 0.205 2.4 γ-Fe2O3/AC 706.01 642.53 0.324 0.252 0.068 1.8 
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