• Title/Summary/Keyword: Activated Rice-Hull carbon

Search Result 6, Processing Time 0.016 seconds

A Study on the Development of Activated Carbon from Rice-Hull (왕겨를 이용한 활성탄 개발에 관한 연구 (I))

  • 이희자;조양석;조광명
    • Journal of Environmental Science International
    • /
    • v.9 no.1
    • /
    • pp.81-88
    • /
    • 2000
  • Every year, 1.1 million tons of rice-hull are produced in South Korea by the by-product in pounding rice. But they has mainly been utilized as a fuel, agricultural compost and moisture proofs. So, it's very valuable to use waste rice-hull for activated carbon manufacture. SiO2 content was the highest among inorganics in rice-hull. Therefore, the SiO2 extraction experiments were carried out under the various conditions of pH 9 to 14, reaction time from 2 to 24 hrs and various temperature of 20 to 100℃. The results showed that increase in pH and temperature enhanced SiO2 extraction from the carbonized rice-hull. The surface area of the carbonized rice-hull indicating activated carbon adsorption capacity was very small as 178∼191 m2/g at first. However, it was increased to 610∼675 m2/g when extracted in alkali solution at 100℃. When the mixing rate of carbonized rice-hull and NaOH was 1:1.5, iodine No. and surface area of activated rice-hull during 10 min at 700℃ were 1,650 mg/g and 1837 m2/g, respectively. Subsequently, an activated carbon with specific surface area of 1,300∼1,900m2/g was manufactured in a short contact time of 10∼30 min with a mixing rate of 1:1.5 in carbonized rice-hull and NaOH, and iodine No. and specific surface area increased as the amount of SiO2 removal increased.

  • PDF

Reuse of Rice-Hull and Application Technology Development in Waste Water Treatment (왕겨의 재활용 및 하수처리 활용기술 개발)

  • Shin, Ho-Sang;Ahn, Hye-Sil;Jung, Dong-Gyun
    • Proceedings of the Korean Institute of Resources Recycling Conference
    • /
    • 2003.10a
    • /
    • pp.170-173
    • /
    • 2003
  • Activated Rice-Hull carbon was developed to remove ammonia compounds in water matrix. Isotherm adsorption tests of ammonia were conducted using a bottle-point technique and column test. Residual ammonia after Jar-Test or passing through the column was determined by Indophenol method, and assessed the removal efficiency for ammonia of the adsorbent. As a result, the adsorption capacity for ammonia of activated racehull carbon was very larger than that of coconut shell carbon, because the rice hull carbon had the higher BET surface area of silicate. The activated racehull carbon is under the development as adsorbent to remove ammonia in drinking water and waste water.

  • PDF

Performance and Safety of EDLC of PVdF-PVP Mixed Binder (PVdF-PVP 복합결합제를 이용한 EDLC의 성능과 안정성)

  • 김경민;오호성;정세일;이용욱;강안수
    • Proceedings of the Safety Management and Science Conference
    • /
    • 2001.05a
    • /
    • pp.319-324
    • /
    • 2001
  • High surface area and high pore volume activated carbon was prepared by KOH activation of rice hull. The electrodes were fabricated by compounding the commercial and rice hull activated carbons with PVdF and PVdF-PVP mixed binders without addition of conductivity improver. The electrodes fabricated with rice hull activated carbon and PVdF-PVP mixed binders showed the best performance because the PVP played as a pore-forming agent. The electrode exhibited excellent electrochemical characteristics having 7.9 W.h/kg of energy density, 33.5 F/g of speific capacitance, 0.7 $\Omega$ of ESR and good efficiency of self-discharge compared with that fabricated with commercial activated carbons.

  • PDF

Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar (KOH 농도 및 탄화온도가 왕겨 활성 바이오차의 NH4-N 흡착능 향상에 미치는 영향)

  • Kim, HuiSeon;Yun, Seok-In;An, NanHee;Shin, JoungDu
    • Korean Journal of Environmental Agriculture
    • /
    • v.39 no.3
    • /
    • pp.171-177
    • /
    • 2020
  • BACKGROUND: Recently, biomass conversion from agricultural wastes to carbon-rich materials such as biochar has been recognized as a promising option to maintain or increase soil productivity, reduce nutrient losses, and mitigate greenhouse gas emissions from the agro-ecosystem. This experiment was conducted to select an optimum conditions for enhancing the NH4-N adsorption capacity of rice hull activated biochar. METHODS AND RESULTS: For deciding the proper molarity of KOH for enhancing its porosity, biochars treated with different molarity of KOH (0, 1, 2, 4, 6, 8) were carbonized at 600℃ in the reactor. The maximum adsorption capacity was 1.464 mg g-1, and an optimum molarity was selected to be 6 M KOH. For the effect of adsorption capacity to different carbonized temperatures, 6 M KOH-treated biochar was carbonized at 600℃ and 800℃ under the pyrolysis system. The result has shown that the maximum adsorption capacity was 1.76 mg g-1 in the rice hull activated biochar treated with 6 M KOH at 600℃ of pyrolysis temperature, while its non-treated biochar was 1.17 mg g-1. The adsorption rate in the rice hull activated biochar treated with 6 M KOH at 600℃ was increased at 62.18% compared to that of the control. Adsorption of NH4-N in the rice hull activated biochar was well suited for the Langmuir model because it was observed that dimensionless constant (RL) was 0.97 and 0.66 at 600℃ and 800℃ of pyrolysis temperatures, respectively. The maximum adsorption amount (qm) and the bond strength constants (b) were 0.092 mg g-1 and 0.001 mg L-1, respectively, for the rice hull activated biochar treated with 6 M KOH at 600℃ of pyrolysis. CONCLUSION: Optimum condition of rice hull activated biochar was 6M KOH at 600℃ of pyrolysis temperature.

($H_{2}S$ Adsorption Capacity of $Na_{2}CO_{3}$ and $KIO_{3}$ Impregnated Activated Carbon (($Na_{2}CO_{3}$$KIO_{3}$ 첨착 왕겨활성탄의 $H_{2}S$ 흡착특성)

  • Kim, Jun-Suk;Kim, Myung-Soo
    • Journal of the Korean Applied Science and Technology
    • /
    • v.19 no.3
    • /
    • pp.213-221
    • /
    • 2002
  • Activated carbons with high surface area of 2,600 $m^{2}/g$ and high pore volume of 1.2 cc/g could be prepared by KOH activation of rice hulls at a KOH:char ratio of 4:1 and $850^{\circ}C$. In order to increase the adsorption capacity of hydrogen sulfide, which is one of the major malodorous component in the waste water treatment process, various contents of $Na_{2}CO_{3}$ and $KIO_{3}$ were impregnated to the rice-hull activated carbon. The impregnated activated carbon with 5 wt.% of $Na_{2}CO_{3}$ showed improved $H_{2}S$ adsorption capacity of 75 mg/g which is twice of that for the activated carbon without impregnation and the impregnated activated carbon with 2.4 wt.% of $KIO_{3}$ showed even higher $H_{2}S$ adsorption capacity of 97 mg/g. The improvement of $H_{2}S$ adsorption capacity by the introduction of those chemicals could be due to the $H_{2}S$ oxidation and chemical reaction with impregnated materials in addition to the physical adsorption of activated carbon.

Adsorption of Methylene Blue by Soybean Stover and Rice Hull Derived Biochars Compared to that by Activated Carbon (메틸렌블루 제거 시 활성탄과 바이오차(대두줄기와 쌀겨)의 흡착성능 비교)

  • Lee, Gi-Bong;Kim, Hyeon-Joo;Park, Soo-Gyeong;Ok, Yong-Sik;Ahn, Johng-Hwa
    • Journal of Korean Society on Water Environment
    • /
    • v.32 no.3
    • /
    • pp.291-296
    • /
    • 2016
  • This study investigated the potential use of soybean stover (SS) (0.1-0.5 g/100 mL)and rice hull (RH) (1.5-3.5 g/100 mL) derived biochars for removing methylene blue (100 mg/L) from wastewater compared to activated carbon (AC) (0.1-0.5 g/100 mL). The adsorption equilibrium data were best represented by Langmuir adsorption isotherm. The calculated maximum adsorption capacity was 71.42 mg/g for AC, 30.30 mg/g for SS, and 4.76 mg/g for RH. The adsorption kinetics was found to follow the pseudo-second order kinetics model. The rate constant was 0.0020-0.0065 g/mg.min for AC, 0.0069-0.5787 g/mg.min for SS, and 0.1370-0.3060 for RH. AC and SS biochars showed considerable potential for adsorption.