Fe₃O₄ 생성에 미치는 황산제일철/황산제이철 몰비의 영향

엄태형,김삼중,안석진,오경환,서동수,Eom, Tae-Hyoung,Tuan, Huynh Thanh,Kim, Sam-Joong,An, Suk-Jin,Oh, Kyoung-Hwan,Suhr, Dong-Soo 한국재료학회 2011 한국재료학회지 Vol.21 No.4

The effect of ferrous/ferric molar ratio on the formation of nano-sized magnetite particles was investigated by a co-precipitation method. Ferrous sulfate and ferric sulfate were used as iron sources and sodium hydroxide was used as a precipitant. In this experiment, the variables were the ferrous/ferric molar ratio (1.0, 1.25, 2.5 and 5.0) and the equivalent ratio (0.10, 0.25, 0.50, 0.75, 1.0, 2.0 and 3.0), while the reaction temperature ($25^{\circ}C$) and reaction time (30 min.) were fixed. Argon gas was flowed during the reactions to prevent the $Fe^{2+}$ from oxidizing in the air. Single-phase magnetite was synthesized when the equivalent ratio was above 2.0 with the ferrous/ferric molar ratios. However, goethite and magnetite were synthesized when the equivalent ratio was 1.0. The crystallinity of magnetite increased as the equivalent ratio increased up to 3.0. The crystallite size (5.6 to 11.6 nm), median particle size (15.4 to 19.5 nm), and saturation magnetization (43 to 71 $emu.g^{-1}$) changed depending on the ferrous/ferric molar ratio. The highest saturation magnetization (71 $emu.g^{-1}$) was obtained when the equivalent ratio was 3.0 and the ferrous/ferric molar ratio was 2.5.

Ferrous sulfate를 깔짚에 첨가했을 때 계사내 암모니아 가스 감소에 관한 연구

최인학,남기홍 대구대학교 생명과학연구소 2004 생명과학연구 Vol.3 No.1

The objectives of this study were to determine the effect of applying chemical additives(FeSO₄) to the litter on ammonia gas production in cage and poultry house air. An experiment measured the ammonia gas production in poultry litter used for 42 days. The chemical additives were applied to the litter at a rate of 200 g ferrous sulfate (FeSO₄·7H₂O) per kg litter. The values of ammonia gas produced from broiler litters which were treated with chemical additives were significantly lower (P< 0.05) than that of the control. This study showed that ammonia gas production can be reduced by chemically treating the litter with FeSO₄.

Fe₃O₄ 생성에 미치는 황산제일철/황산제이철 몰비와 침전제의 영향

엄태형(Tae Hyoung Eom),김삼중(Sam Joong Kim),안석진(Suk Jin An),오경환(Kyoung Hwan Oh),서동수(Dong Soo Suhr) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.5

The effect of ferrous/ferric molar ratio and precipitants on the formation of nano size magnetite particle was investigated by co-precipitation method. Ferrous sulfate and ferric sulfate were used as iron sources and sodium hydroxide and ammonium hydroxide was used as a precipitant. Single phase magnetite was synthesized with all of experiment conditions (ferrous/ferric molar ratios and precipitants). Particle size was smaller, and particle size distribution was narrower when NaOH was used than NH₄OH was used. The crystallinity and particle size was increased and narrower particle size distribution with increasing molar ratio ferrous/ferric sulfate with the same precipitant. Super paramagnetism could be obtained at all of experiment conditions. The highest saturation magnetization (72 emu/g) was obtained when the ferrous/ferric molar ratio was 2.5 and precipitant was used NH₄OH.

Porcelain의 표면코팅을 위한 Hematite 적색 안료의 특성

김경남,박현,원일안,Kim, Kyung-Nam,Park, Hyun,Won, Il-An 한국재료학회 2017 한국재료학회지 Vol.27 No.4

In this study, an ${\alpha}-Fe_2O_3$ (hematite) coated porcelain plate was sintered in a temperature range from $1100^{\circ}C$ to $1250^{\circ}C$ using ferrous sulfate. The specimens were investigated by X-ray diffractometer (XRD), scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), and UV-visible spectrophotometer. It was confirmed that ${\alpha}-Fe_2O_3$ (hematite) was densely fused to the surface at several tens of ${\mu}m$, the ${\alpha}-Fe_2O_3$ (hematite) was in the form of thin platelet and polyhedra, and no other compounds appeared in the sintering process. In the specimen coated with ${\alpha}-Fe_2O_3$ (hematite), the reflectance spectra show a red absorption band of 560-650 nm. The $L^*$ value decreased from 53.18 to 46.94 with the firing temperature. The values of $a^*$ and $b^*$ were at 19.03 and 15.25 at $1100^{\circ}C$ and gradually decreased with increasing temperature; these values decreased rapidly at $1250^{\circ}C$ to 11.54 and 7.98, respectively. It is considered that the new phases are formed by the phase transition of the porcelain plate (clay), and thus the $a^*$ and $b^*$ values are greatly influenced.

파킨슨씨병 유발물질인 황산철로 손상된 배양 신경아교세포에 대한 물매화 추출물의 항산화 효과

서영미,양승범 대한임상검사과학회 2022 대한임상검사과학회지(KJCLS) Vol.54 No.4

본 연구는 배양 C6 glioma 세포를 재료로 파킨슨병의 유발물질인 황산철(FeSO4)의 신경독성과 이에 대한 물매화(Parnassia palustria L., PP) 추출물의 영향을 조사하였다. 이를 위하여 세포생존율을 비롯한 슈퍼뮤타제(SOD)-유사능 및 과산소음이온라디칼(SAR)-소거능과 같은 항산화 효과를 분석하였다. 본 연구에서 FeSO4는 처리농도에 비례하여 세포생존율을 유의하게 감소시켰으며, 이 과정에서 XTT50값이 63.3 μM로 나타나 Borenfreund and Puerner의 독성판정기준에 따라 고독성(highly-toxic)인 것으로 나타났다. 또한, 항산화제의 일종인 quercetin은 FeSO4의 독성으로 손상된 세포생존율을 유의하게 증가시켰다. 한편, PP 추출물은 FeSO4만을 처리한 것에 비하여 세포생존율을 유의하게 증가시켰으며, 동시에 SOD-유사능과 SAR-소거능과 같은 항산화능을 나타냈다. 이상의 결과로부터, FeSO4의 세포독성에 산화적 손상이 관여하고 있으며, PP 추출물은 항산화 효과에 의하여 FeSO4에 의한 세포독성을 효과적으로 방어하였다. 결론적으로, 물매화 추출물과 같은 천연물은 FeSO4와 같이 산화적 손상과 관련된 질환을 유발시키는 중금속화합물에 의한 독성을 개선 내지는 치료하는데 유용한 소재라고 생각된다.

황산제일철과 황산제이철을 이용한 산화철 합성

엄태형,김삼중,서동수,Eom, Tae-Hyoung,Tuan, Huynh Thanh,Kim, Sam-Joong,Suh, Dong-Soo 한국재료학회 2010 한국재료학회지 Vol.20 No.6

The chemical formula of magnetite ($Fe_3O_4$) is $FeO{\cdot}Fe_2O_3$, t magnetite being composed of divalent ferrous ion and trivalent ferric ion. In this study, the influence of the coexistence of ferrous and ferric ion on the formation of iron oxide was investigated. The effect of the co-precipitation parameters (equivalent ratio and reaction temperature) on the formation of iron oxide was investigated using ferric sulfate, ferrous sulfate and ammonia. The equivalent ratio was varied from 0.1 to 3.0 and the reaction temperature was varied from 25 to 75. The concentration of the three starting solutions was 0.01mole. Jarosite was formed when equivalent ratios were 0.1-0.25 and jarosite, goethite, magnetite were formed when equivalent ratios were 0.25-0.6. Single-phase magnetite was formed when the equivalent ratio was above 0.65. The crystallite size and median particle size of the magnetite decreased when the equivalent ratio was increased from 0.65 to 3.0. However, the crystallite size and median particle size of the magnetite increased when the reaction temperature was increased from $25^{\circ}C$ to $75^{\circ}C$. When ferric and ferrous sulfates were used together, the synthetic conditions to get single phase magnetite became simpler than when ferrous sulfate was used alone because of the co-existence of $Fe^{2+}$ and $Fe^{3+}$ in the solution.

육계 깔짚내 유해성 병원균 감소를 위한 화학제재의 이용

정태호 ( Tae-ho Chung ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.2

This study was conducted to evaluate the effect of chemical blend additives (a combination of ferrous sulfate and aluminum chloride) on decreasing pathogens in poultry litter. A total of 240 broiler chickens were assigned to 4 chemical treatments with 4 replicates of 15 chickens per pen. The four chemical blend additives were a control (no treatment), 25 g ferrous sulfate + 75 g aluminum chloride/kg poultry litter, 50 g ferrous sulfate + 100 g aluminum chloride/kg poultry litter and 100 g ferrous sulfate + 150 aluminum chloride/kg poultry litter. During the 6-wk experimental period, there were significant differences in both E.coli and Salmonella enterica for weeks 4 through 6, but not at weeks 1 and 3, respectively. Consequently, using chemical blend additives that serve as methods to control strict environmental regulations reduced pathogens in poultry litter.

Iron sulfate for the control of dollar spot disease

Rudland Matthew,Sang-Kook Lee,Hsiang Tom 한국잔디학회 2023 Weed & Turfgrass Science Vol.12 No.4

Iron is an essential nutrient for living organisms and has critical functions in many cellular processes. However, excess soluble iron in plant cells leads to the formation of harmful hydroxyl radicals that can negatively affect the plant. Ferrous sulfate has been used to green up turfgrass for decades, but more recently, the use of ferrous sulfate has been reported to reduce turfgrass diseases such as Microdochium patch and dollar spot. This review describes some of this research emphasizing efficacy against dollar spot, as well as the mechanisms by which iron enters the plant and exerts its effects, and provides recommendations for the use of ferrous sulfate in managing dollar spot disease.

Co/Fe 황화물의 혼합안료에 의한 도자기 표면의 상형성과 색변화

김남훈,신대용,김경남 한국재료학회 2022 한국재료학회지 Vol.32 No.8

In this study, an Co/Fe coated porcelain using a cobalt and ferrous sulfate was sintered at 1,250 oC. The specimens were investigated by HR-XRD, FE-SEM (EDS), Dilatometer, and UV-vis spectrophotometer. The surface of the porcelain was uniformly fused with the pigment, and white ware and celadon body specimens were densely fused to a certain thickness from the surface. Other new compounds were produced by the chemical reaction of cobalt/ferrous sulfate with the porcelain body during the sintering process. These compounds were identified as cobalt ferrite spinel phases for white ware and white mixed ware, and an andradite phase for the celadon body, and the amorphous phase, respectively. As for the color of the specimens coated with cobalt and ferrous mixed pigments, it was found that the L* value was greatly affected by the white ware, and the a* and b* values were significantly changed in the celadon body. The L* values of the specimens fired with pure white ware, celadon body, and white mix ware were 72.1, 60.92, 82.34, respectively. The C7F3 pigment coated porcelain fired at 1,250 oC had L* values of 39.91, 50.17, and 40.53 for the white ware, celadon body, and white mixed ware, respectively; with a* values of -1.07, -2.04, and -0.19, and at b* values of 0.46 and 6.01, it was found to be 4.03. As a new cobalt ferrite spinel phase was formed, it seemed to have had a great influence on the color change of the ceramic surface.

Tannic Acid and Ferrous Sulfate Modified Kapok Fiber for Oil-water Separation

Guizhen Ke,Shuhui Chen,Jiani Tang,Huanmin Li,Keshuai Liu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11

Biodegradable oil absorbing materials have attracted extensive attention in dealing with oil spill pollution. Todevelop more excellent oleophilic oil sorbent, the combination of tannic acid and ferrous sulfate was employed to treat therenewable and biodegradable natural kapok fiber. The as-prepared kapok showed superhydrophobic characteristics with highwater contact for the formation of tannic acid and ferrous ion complex on kapok surface, which was confirmed by scanningelectron microscopy observation and infrared spectroscopy and X-ray diffraction analysis. The preparation process of themodified kapok fiber was optimized. When the sodium chlorite pretreated kapok fiber was firstly treated with 4.25 g/l tannicacid and subsequently immersed in 4.25 g/l tannic acid and 6.25 g/l ferrous sulfate mixture at 60 °C for 15 min, the aspreparedkapok fiber presented the best oil absorption capacity and hydrophobicity (water contact angle 150.7 °). The treatedkapok had good adsorption capacity for oils and organic solvents, 48.2, 41.6, 53.4, 52.8, 49.2, 41.2 g/g for vegetable oil,diesel oil, silicone oil, carbon tetrachloride, DMF and n-hexane, respectively. In addition, the tannic acid and ferrous sulfatetreated kapok was recycled for six times through simple mechanical squeezing, and showed good oil-water separationperformance oil, indicating its potential application in the removal of spilled oil on water.