LIUYu-ning,ZHANGQian,TANBin,et al.Effect of Modification Methods on Biochar Composite System for Degradation of Reactive Blue 19[J].China Water & Wastewater,2022,38(19):69-75.
改性方法对生物炭复合体系降解活性蓝19的影响
- Title:
- Effect of Modification Methods on Biochar Composite System for Degradation of Reactive Blue 19
- Keywords:
- biochar; modification; nano zero-valent iron; persulfate; activation; reactive blue 19
- 摘要:
- 以黍糠为原材料，采用磷酸、氢氧化钠、碳酸钾三种改性剂制备改性生物炭，然后将纳米零价铁（nZVI）负载到改性生物炭上得到纳米零价铁基改性生物炭，并将其与过硫酸盐（PS）组合成复合体系。探究3种改性方法对生物炭、nZVI基生物炭和活化过硫酸盐的影响。结果表明，磷酸改性的生物炭（PBC）有较大的比表面积和丰富的官能团，且nZVI的负载效果好，减少了铁的溶出。氢氧化钠改性的生物炭（SBC）比表面积变化不大，羧基官能团的数量有减少，nZVI的负载效果较好。碳酸钾改性的生物炭（KBC）比表面积有显著提升，官能团基本无变化，负载nZVI后铁的溶出量相对较大。纳米零价铁基改性生物炭对过硫酸盐的活化效果为：磷酸改性>碳酸钾改性>氢氧化钠改性，nZVI-PBC/PS复合体系对活性蓝19染料（RB19）的降解率可达到92.8%。
- Abstract:
- The modified biochar was prepared from millet bran with three different modifiers, namely phosphoric acid, sodium hydroxide and potassium carbonate. Then, nano zero-valent iron (nZVI) was loaded onto the modified biochar and combined with persulfate (PS) to form a composite system. The effects of three modification methods on biochar and nZVI-based modified biochar for activation of persulfate (PS) were investigated. The phosphoric acid modified biochar (PBC) had a large specific surface area and abundant functional groups, and a good loading performance of nZVI was obtained, which reduced the iron dissolution. The specific surface area of sodium hydroxide modified biochar (SBC) had little change, the number of carboxyl functional groups decreased, and the loading performance of nZVI was better. The specific surface area of potassium carbonate modified biochar (KBC) was significantly increased, the functional groups were basically unchanged, and the dissolution quantity of nZVI was large. The performance of nZVI-based modified biochar for activation of persulfate in descending order was as follows: phosphoric acid, potassium carbonate and sodium hydroxide. The degradation rate of RB19 by nZVI-PBC/PS composite system reached 92.8%.
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