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首页> 外文期刊>RSC Advances >A green route for preparation of low surface area SiO2 microspheres from wheat straw ash with activated carbon and NPK compound fertilizer as by-products
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A green route for preparation of low surface area SiO2 microspheres from wheat straw ash with activated carbon and NPK compound fertilizer as by-products

机译：以活性炭和氮磷钾复合肥为副产品由麦草灰制备低表面积SiO2微球的绿色途径

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摘要

In order to make full use of wheat straw ash which is abundant and causes some serious environmental problems in the north of China, an environmentally friendly route is proposed to convert the wheat straw ash to useful materials in this paper. In this route, low surface area SiO2 microspheres are obtained from wheat straw ash, with the activated carbon and Nitrogen-Phosphorus-Potassium (NPK) compound fertilizer as by-products. KOH is used as the silica extraction reagent and H3PO4 is the precipitator. The resulting SiO2 microspheres with narrow size distribution have an amorphous structure with diameters of approximately 480 nm and a specific surface area of 47.79 m(2) g(-1) under the optimized synthesis conditions with a volume ratio of 1 : 1.5 : 1 for extract/water/ethanol, a pH value of 8 and H3PO4 solution dripping rate of 3 mL min(-1). In this optimized route, the yields of SiO2 and activated carbon reach 96.77% and 71.89%, respectively. The waste water produced in this process is used to produce NPK compound fertilizer. The whole route is an environmentally friendly process without any emission of pollution.
机译：为了充分利用我国北方丰富而又引起严重环境问题的小麦秸秆灰，提出了一条将小麦秸秆灰转化为有用材料的环保路线。通过这种途径，从小麦秸秆灰中获得低表面积的SiO2微球，并以活性炭和氮磷钾（NPK）复合肥料为副产品。 KOH被用作二氧化硅萃取剂，而H3PO4被用作沉淀剂。在优化的合成条件下（体积比为1：1.5：1），所得的SiO2微球尺寸分布狭窄，具有非晶态结构，直径约为480 nm，比表面积为47.79 m（2）g（-1）。萃取液/水/乙醇，pH值为8，H3PO4溶液滴速为3 mL min（-1）。在这种优化路线中，SiO2和活性炭的收率分别达到96.77％和71.89％。此过程中产生的废水用于生产NPK复合肥料。整个路线都是环保的过程，没有任何污染排放。

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