CAJ | 학술논문

利用纳米零价铁去除水中各类污染物是近年来的研究热点，但纳米零价铁颗粒在水中的团聚会导致反应活性降低，研究通过在纳米铁颗粒制备过程中添加分散剂聚丙烯酸( PAA)，提高其分散性，强化其在水中反应活性，合成改性纳米零价铁颗粒( PAA-Fe)，并首次用于降解水中的亚甲基蓝.对其 SEM、TEM、XRD和比表面积表征结果表明，与未改性原始纳米零价铁颗粒相比， PAA-Fe颗粒表面较光滑，团聚减少、颗粒粒径减小，比表面积增大.改性剂 PAA添加浓度为0.1 g·L-1时，经过60 min降解反应， PAA改性纳米铁颗粒对亚甲基蓝的脱色率为98.84％，较未改性颗粒脱色率提高了27.32％.改性纳米铁颗粒对亚甲基蓝的脱色效果受初始溶液的pH值、初始溶液的浓度、 PAA-Fe投加量和反应温度影响. PAA-Fe与亚甲基蓝的脱色反应符合假一级反应动力学规律.
이용납미령개철거제수중각류오염물시근년래적연구열점，단납미령개철과립재수중적단취회도치반응활성강저，연구통과재납미철과립제비과정중첨가분산제취병희산( PAA)，제고기분산성，강화기재수중반응활성，합성개성납미령개철과립( PAA-Fe)，병수차용우강해수중적아갑기람.대기 SEM、TEM、XRD화비표면적표정결과표명，여미개성원시납미령개철과립상비， PAA-Fe과립표면교광활，단취감소、과립립경감소，비표면적증대.개성제 PAA첨가농도위0.1 g·L-1시，경과60 min강해반응， PAA개성납미철과립대아갑기람적탈색솔위98.84％，교미개성과립탈색솔제고료27.32％.개성납미철과립대아갑기람적탈색효과수초시용액적pH치、초시용액적농도、 PAA-Fe투가량화반응온도영향. PAA-Fe여아갑기람적탈색반응부합가일급반응동역학규률.
Nano zerovalent iron ( NZVI ) technology has attracted tremendous amount of interests for degrading a number of environmental contaminants found both in surface water and underground water. However, these nanoscale particles are prone to aggregate, which may result in the decrease of its reactivity in liquid phase. Iron nanoparticles (Fe NPs) modified with polyacrylic acid (PAA) has enhanced the dispersion of NZVI and reduced its agglomeration. For the first time, PAA modified NPs (PAA-Fe NPs) were used for degradation of methylene blue in water phase. The PAA-Fe NPs prepared were characterized in terms of TEM, SEM, XRD and specific surface area. The results indicated that, the surface area of PAA-Fe NPs was increased, compared with unmodified pristine zero-valent iron NPs, and PAA-Fe NPs were smoother with smaller particle size. With addition of 0. 1 g·L-1 of PAA, the decolorization efficiency of methylene blue by PAA-Fe NPs was 98. 84% in 60 min, which was 27. 32% higher than that of pristine Fe NPs. Decolorization efficiencies were also affected by initial pH value, initial concentration of methylene blue, dosage of PAA-Fe NPs, and degradation temperature. Kinetic analyses based on the experimental data illustrated that the decolorization reaction of methylene blue fitted well to the pseudo first-order kinetics model.