| 摘要 |
<p>The invention relates to a process for preparing a sorbent material. In this process a particulate siliceous material is combined with a strong acid to form a mixture. The mixture is then adjusted to a pH of between about 3 and about 6. An acidified solid is then separated from the mixture and may be treated with a treating agent so as to produce the sorbent. The treating agent is an organic amine or organoammonium salt. The invention also relates to a sorbent comprising a particulate siliceous substance having ammonium groups on the surface thereof.</p> |
