功能化金属有机骨架材料对水中有机砷酸的吸附
Adsorption of organic arsenic acids from water over functionalized metal-organic frameworks.
机构信息
Department of Chemistry, Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
Department of Chemistry, Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
出版信息
J Hazard Mater. 2017 Aug 5;335:162-169. doi: 10.1016/j.jhazmat.2017.04.044. Epub 2017 Apr 19.
Organic arsenic acids (OAAs) are regarded as water pollutants because of their toxicity and considerable solubility in water. Adsorption of OAAs such as phenylarsonic acid (PAA) and p-arsanilic acid (ASA) from water was investigated over functionalized (with OH groups) metal-organic framework (MOF, MIL-101), as well as over pristine MIL-101 and commercial activated carbon. The highly porous MIL-101 bearing three hydroxyl groups (MIL-101(OH)) exhibited remarkable PAA and ASA adsorption capacities. Based on the effects of pH on PAA and ASA adsorption, hydrogen bonding was suggested as a plausible mechanism of OAA adsorption. Importantly, OAAs and MIL-101(OH) can be viewed as hydrogen-bond acceptors and donors, respectively. Moreover, MIL-101(OH) could be regenerated by acidic ethanol treatment, being a promising adsorbent for the removal of PAA and ASA from water.
有机砷酸（OAAs）因其毒性和在水中的高溶解度而被视为水污染物。本文研究了功能化（具有 OH 基团）金属有机骨架（MOF，MIL-101）以及原始 MIL-101 和商业活性炭对苯砷酸（PAA）和对氨基苯砷酸（ASA）等有机砷酸的吸附。具有三个羟基的高多孔 MIL-101（MIL-101(OH)) 表现出显著的 PAA 和 ASA 吸附能力。基于 pH 对 PAA 和 ASA 吸附的影响，氢键被认为是 OAA 吸附的一种可能机制。重要的是，OAAs 和 MIL-101(OH) 可以分别看作是氢键的供体和受体。此外，MIL-101(OH) 可以通过酸性乙醇处理再生，是一种有前途的吸附剂，可用于从水中去除 PAA 和 ASA。
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