改性玉米芯生物炭与钢渣微粉组合吸附磷的研究

Study on adsorption of phosphorus and hydrochloricacid by the combination of modified corncob biochar and steel slag micropowder

探究镁改性玉米芯生物炭和钢渣微粉以及两者组合对含磷模拟废水的吸附效果。结果表明,5 g玉米芯粉末在10 mL的1.5 mol/L浓度MgCl_(2)改性条件下,在热解温度为450℃的马弗炉中烧制的生物炭对磷吸附效果最佳。钢渣微粉与镁改性玉米芯生物炭组合的添加量由14 g/L钢渣微粉和4 g/L镁改性玉米芯生物炭混合组成。钢渣微粉与镁改性玉米芯生物炭组合对磷的吸附效果均好于两者单独存在时,去除率高达98%,并在60 min时吸附达到平衡,组合投加吸附平衡时间均短于两种材料分别单独存在时。组合投加吸附过程满足准二级吸附动力学模型,且符合Langmuir等温吸附方程,最大理论吸附量为0.12 mg/g。

The adsorption effect of magnesium modified corncob biochar,steel slag powder and their combination on phosphorus-containing simulated wastewater was investigated.The results showed that the biochar produced by 5 g corncob powder modified by 10 mL of 1.5 mol/L MgCl_(2)in muffle furnace with pyrolysis temperature of 450℃could adsorb phosphorus.The addition of steel slag powder and magnesium modified corncob biochar is composed of 14 g/L steel slag powder and 4 g/L magnesium modified corncob biochar.The adsorption effect of the combination of steel slag powder and magnesium modified corncob biochar on phosphorus was better than that of the combination of steel slag powder and magnesium modified corncob biochar,the removal rate was up to 98%and the adsorption reached equilibrium in 60 min,and the adsorption equilibrium time was shorter than that of the combination of the two materials.Combined dosage adsorption quasi-second-order adsorption kinetics model and Langmuir isothermal adsorption equation,the maximum theoretical adsorption capacity is 0.12 mg/g.