Rice straw, one of the main agricultural wastes of the north of Iran, was utilized for parallel extraction of two valuable products for the first time: high surface area activated carbon (AC) and porous silica nano-particles. The positive effect of silica extraction from activated rice straw biochar on the porosity of resultant AC was determined. It was found that the performance of K₂CO₃ was better than KOH for producing highly porous AC (2356 m²/g) under less severe conditions (relatively low impregnation ratio = 1.5). The sensitivity analysis for several operating conditions was carried out, and the optimal conditions to reach the highest surface area, porous volume, and silica extraction yield were determined for each chemical agent using Taguchi analysis. Among the factors changed, the highest quota belongs to the impregnation ratio and activation temperature, and the other parameters were fixed at economic levels. The average production yield of activated carbon and silica from raw rice straw was calculated around 9% and 7%, respectively. The average particle size of silica powder was estimated by SEM (around 35 nm) and DLS tests (200–300 nm), and an acceptable BET surface area and pore volume of 250 m²/g and 1 cm³/g, respectively, were obtained for this product.

稻草是伊朗北部主要的农业废料之一，首次用于平行提取两种有价值的产品：高表面积活性炭（AC）和多孔二氧化硅纳米颗粒。确定了从活化稻草生物炭中提取二氧化硅对所得AC孔隙率的积极影响。发现在生产高度多孔的AC（2356m ^2）时，K ₂ CO _3的性能优于KOH。/ g）在较不严重的条件下（相对较低的浸渍比= 1.5）。对几种操作条件进行了敏感性分析，并使用田口分析法确定了每种化学试剂达到最大表面积，多孔体积和二氧化硅提取产率的最佳条件。在变化的因素中，最高的配额属于浸渍率和活化温度，其他参数固定在经济水平上。从生稻草中得到的活性炭和二氧化硅的平均产率分别约为9％和7％。二氧化硅粉末的平均粒径通过SEM（约35 nm）和DLS测试（200-300 nm）估算，可接受的BET表面积和孔体积为250 m ² / g和1 cm ³对于该产品分别获得了/ g。