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通过D201(Cl型)树脂的离子交换作用,将[Fe(Ⅱ)EDTA]~(2-)嫁接到树脂骨架上,并以此研究该树脂对NO的吸收过程和脱除效果.主要考察了D201(Cl型)树脂嫁接[Fe(Ⅱ)EDTA]~(2-)过程中[Fe(Ⅱ)EDTA]~(2-)负载量、EDTA与Fe~(2+)物质的量比、络合液p H、抗氧化剂复配体系等因素对改性树脂脱除NO的影响.结果表明,D201(Cl型)树脂负载[Fe(Ⅱ)EDTA]~(2-)能够有效地脱除NO,树脂表面残留的络合液在脱除NO过程中起到关键作用,它为NO进入树脂内部反应提供了通道;NO脱除效果随着[Fe(Ⅱ)EDTA]~(2-)负载量的增加而提高,70 g树脂饱和负载量为12.5~15.0 mmol;当络合液EDTA与Fe~(2+)的物质的量比为1.5、p H=6时,得到的负载[Fe(Ⅱ)EDTA]~(2-)树脂脱除NO的效果最好;烟气中的氧气对NO脱除效果影响极大,加入0.02 mol·L~(-1)抗坏血酸的复配体系能够较好地减缓氧气的影响;红外分析结果证明,[Fe(Ⅱ)EDTA]~(2-)和SO_4~(2-)一起参与了树脂离子交换过程;BET分析表明,D201树脂负载前后孔结构没有变化,树脂的大孔结构提供了较大的NO吸收接触面积.
The [Fe (Ⅱ) EDTA] ~ (2-) was grafted onto the resin matrix through the ion exchange of D201 (Cl type) resin, and the absorption process and removal efficiency of NO with this resin were studied. [Fe (Ⅱ) EDTA] ~ (2-) loading, ratio of EDTA to Fe 2+ in grafted [Fe (Ⅱ) EDTA] ~ (P-phenylalanine), mixed solution p H and antioxidant complex system on the removal of NO by modified resin.The results showed that [Fe (Ⅱ) EDTA] 2- , The complexing liquid remaining on the surface of the resin plays a key role in the process of removing NO, which provides a channel for NO to enter the internal reaction of the resin. The effect of removing NO with [Fe (II) EDTA] ~ (2-) , The saturated loading of 70 g resin was 12.5 ~ 15.0 mmol. When the molar ratio of EDTA to Fe ~ (2+) was 1.5 and p H = 6, the loading [Fe (Ⅱ ) EDTA] ~ (2-) resin was the best. The oxygen in the flue gas greatly affected the removal efficiency of NO. The addition of 0.02 mol·L -1 ascorbic acid could better And the effect of oxygen was slowed down. The results of IR showed that the [Fe (Ⅱ) EDTA] ~ (2-) and SO_4 ~ (2-) Exchange process; a BET analysis shows, D201 resin pore structure did not change before and after loading, macroporous structure of the resin provides a large contact area absorbing NO.