硝酸改性活性炭的制备及其对Cu2+的吸附性能

以不同浓度的硝酸对活性炭进行改性，用BET氮吸附法和Boehm滴定法对改性前后的活性炭进行了表征，并比较了改性和未改性活性炭对模拟含铜废水的处理效果。结果表明：经过硝酸氧化改性的活性炭比表面积有所增大，含氧官能团总量明显增加，因而对水中Cu²⁺的去除率大为提高；在常温、自然pH、活性炭用量为5 g/L、吸附时间为180 min的条件下处理浓度为10 mg/L的模拟含铜废水，经浓度为10%的硝酸改性的活性炭对Cu²⁺的去除率在70%以上，经浓度为70%的硝酸改性的活性炭对Cu²⁺的去除率接近90%；Langmuir等温吸附模型可较好地描述硝酸改性活性炭对Cu²⁺的等温吸附行为。

Preparation and Cu2+ Adsorption ability of Nitric Acid Modified Granular Activated Carbon

Granular activated carbon was modified with nitric acid of different concentration.The surface chemical characteristic of pre-modified and post-modified activated carbon was analyzed by BET specific surface area test and Boehm functional group titration.The treatment effects of simulated wastewater containing copper by pre-modified and post-modified granular activated carbon were compared.The results indicated that specific surface area and the total quality of acid functional group increased in the process of nitric acid oxidation，which lead to the increase of the Cu²⁺ removal rates considerably.On the conditions of normal temperature，natural pH，equilibrium time of 180 min，absorbent dosage of 5 g/L，the Cu²⁺ removal rates was above 70% by the granular activated carbon which was modified with nitric acid of 10% concentration，and about 90% by the granular activated carbon which was modified with nitric acid of 70% concentration respectively.The Cu²⁺ adsorption behavior of nitric acid-modified granular activated carbon conformed to Langmuir adsorption equation.