为了改善活性炭的吸附性能,以硫脲和甲醛为主要原料对活性炭进行了改性,并对改性活性炭的吸附性能进行了研究.静态吸附实验表明:改性活性炭在酸性环境中比在碱性溶液中对Au3+的吸附能力要强;无论是对金的吸附容量还是在含有重金属离子(Cu2+、Ni2+和Zn2+)的混合溶液中吸附金的选择性,改性活性炭都比一般活性炭强得多;改性活性炭几乎可将混合溶液中Au3+完全吸附,而对重金属离子Ni2+和Cu2+的吸附率不到1/3.改性活性炭对金的吸附符合Langmuir单分子层吸附规律.
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