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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Adsorption of naphthenic acids on high surface area activated carbons
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Adsorption of naphthenic acids on high surface area activated carbons

机译：环烷酸在高表面积活性炭上的吸附

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摘要

In oil sands mining extraction, water is an essential component; however, the processed water becomes contaminated through contact with the bitumen at high temperature, and a portion of it cannot be recycled and ends up in tailing ponds. The removal of naphthenic acids (NAs) from tailing pond water is crucial, as they are corrosive and toxic and provide a substrate for microbial activity that can give rise to methane, which is a potent greenhouse gas. In this study, the conversion of sawdust into an activated carbon (AC) that could be used to remove NAs from tailings water was studied. After producing biochar from sawdust by a slow-pyrolysis process, the biochar was physically activated using carbon dioxide (CO_2) over a range of temperatures or prior to producing biochar, and the sawdust was chemically activated using phosphoric acid (H_3PO_4). The physically activated carbon had a lower surface area per gram than the chemically activated carbon. The physically produced ACs had a lower surface area per gram than chemically produced AC. In the adsorption tests with NAs, up to 35 mg of NAs was removed from the water per gram of AC. The chemically treated ACs showed better uptake, which can be attributed to its higher surface area and increased mesopore size when compared with the physically treated AC. Both the chemically produced and physically produced AC provided better uptake than the commercially AC.
机译：在油砂开采中，水是必不可少的成分。但是，经过处理的水由于在高温下与沥青接触而受到污染，并且其中一部分无法循环利用，最终流向尾矿池。从尾矿池水中去除环烷酸（NAs）至关重要，因为它们具有腐蚀性和毒性，并为微生物活动提供了可能产生甲烷的基质，甲烷是一种有力的温室气体。在这项研究中，研究了将木屑转化为可用于从尾矿水中去除NAs的活性炭（AC）的方法。在通过慢速热解法从锯末生产生物炭后，在一定温度范围内或在生产生物炭之前，先用二氧化碳（CO_2）对生物炭进行物理活化，然后使用磷酸（H_3PO_4）对木屑进行化学活化。物理活性炭具有比化学活性炭低的每克表面积。物理生产的AC比化学生产的AC具有更低的每克表面积。在用NAs进行的吸附测试中，每克AC从水中去除了多达35 mg的NAs。化学处理的AC表现出更好的吸收性，这可以归因于与物理处理的AC相比，其较高的表面积和增加的中孔尺寸。化学生产和物理生产的AC均比商业AC提供更好的吸收。

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