Catalytic perfomance of waste red mud for the complete oxidation of benzene

심왕근,남승원,김상채 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

In this work, we evaluated the waste red mud as the potential catalyst for treating the hazardous compounds. In particular, several physicochemical pretreatments such as acid aqueous solution and thermal air were employed to properly modify the textural properties of the waste red mud. Several well-known methods including nitrogen adsorption, XRD, ICP-AES, FT-IR, SEM, TEM an TPR were used to characterize the waste red mud and its modified red mud. Our results indicated that the catalytic activity of the waste red mud was highly dependent on the pretreatment methods applied. The red red mud pretreated with acid aqueous solution had a high potential as an alternative catalyst for removing the volatile organic compounds. ^**This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2013R1A1A2057577).

2P-747 Surface energetic heterogeneity analysis SBA-15 silica synthesized using a micro flow reactor

심왕근,류성철,황민진,( M. S. Balathanigaimani ),문희 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.0

Dynamic perfomance of cellulose triacetate forward osmosis membrane system

심왕근,김상채,( Sherub Phuntsho ),( Ho Kyong Shon ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

Water and energy scarcity are becoming worldwide issues. At present membrane based processes have been considered as promising approaches for solving these special problems. On the other hand, fertilizer driven forward osmosis (FDFO) process has recently received great interest in the agricultural area due to its feasible application for irrigation and relatively lower energy requirement for managing the process. In this work we comparatively examined the desalination characteristics of two spiral wound cellulose tri acetate (CTA) FO membranes using brackish groundwater. In particular the performance relationships between water flux and different operating conditions such as flow rate, concentration and osmotic pressure were investigated. In order to theoretically examine the FDFO desalination process, two-dimensional dynamic model was developed and used to evaluate the effect of operating process parameters on the system.

Analysis of the surface heterogeneity of biomass based activated carbon

심왕근,( M. S. Balathanigaimanid ),김상채,문희 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

Biomass based activate carbons have been widely used in many applications such as gas separation, energy storage and wastewater treatment due to their unique adsorption characteristics and economic feasibility. In this work, corn-grains based ACs were prepared using two different physico-chemical methods: physical and chemical-physical activations. In order to analysis the surface heterogeneity of porous ACs, the nitrogen adsorption isotherm data measured at 77 K was used. The Frenkel-Halsey-Hill relation was used to examine the surface structural roughness of the ACs. In addition, the adsorption energy distribution functions were used to examine the energetic heterogeneity of ACs. To solve the adsorption integral equation, a general regularization method was employed. The Fowler-Guggenheim model was used as a local adsorption isotherm. In particular, the relationship between the preparation condition and the surface heterogeneity was thoroughly discussed.

Adsorption Column Dynamics of VOCs in Monolith Adsorber

심왕근,최도영,이재욱,문희 한국공업화학회 2004 한국공업화학회 연구논문 초록집 Vol.2004 No.1

P-65 : Adsorption Column Dynamics of VOCs in Monolith Adsorber

심왕근,최도영,이재욱,문희 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2

The performance of an adsorption-based process greatly depends on the effectiveness of design and the operating conditions. Over the past few decades, lots of studies and industrial applications have been conducted in a charged column with pelletized adsorbents in this area. In general the monolith (or honeycomb) reactor is widely adopted in catalytic processes due to their unique features. In other words, it provides 1) very low pressure drop, 2) high surface to volume ratio, 3) minimal channeling, 4) excellent mass transfer characteristics, etc. However, there have been limited studies that tried to develop a mathematical model and to assess the performance of monolith reactor in adsorption based process. Therefore, the main objective of the present work was to acquire accurate information on adsorption characteristics of VOCs and water vapour and to examine the potential of monolith adsorber, in this area.

Adsorption Equilibrium of VOCs in Washcoated Monolith with MCM-48

심왕근,최승필,이재욱,문희 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1

The ordered mesoporous materials have great potential and new opportunities in the fields of adsorption application area. Adsorption properties of these materials have been widely studied by using various gases, organic solvents, heavy metals, and bio chemicals. A cordierite honeycomb ceramic substrate with 600cells cm-2 was used as starting material of the monolith adsorbent. The sample employed in this work was obtained by using the washcoat method. Cylindrical ceramic substrate of 2.54 cm in diameter and 5.7 cm in length was washcoated with MCM-48. Nitrogen adsorption and desorption isotherms at 77 K were measured using a Micrometrics ASAP 2020. Adsorption experimental equilibrium data in wide range of temperature and concentration is essential for design and optimization of the adsorption processes. Therefore, the adsorption equilibria for several organic vapors on washcoated monolith adsorbent were measured using a gravimetric method. The equilibrium data were obtained at various temperatures. The Hybrid isotherm equations were successful in correlating the experimental isotherms. Moreover, the surface heterogeneity of washcoated monolith was evaluated in terms of an isosteric enthalpy of adsorption.

Mathematical modelling of air gap membrane distillation: Graphene enhanced electrospun polyvinylidene fluoride-co-hexafluoropropylene membrane module

심왕근,이승재,( Yun Chul Woo ),( Leonard D. Tijing ),김상채,문희,( Ho Kyong Shon ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

Membrane distillation (MD) process, which is a non-isothermal water treatment technology having high salinity, has received wide attention due to its higher production quality of permeate and relatively lower thermal requirement compared to other conventional methods. In this work, we synthesized graphene/ polyvinylidene fluoride-co-hexafluoropropylene(PVDF-co-HFP) membranes by one-step electro spinning method and evaluated their desalination ability. In particular a two dimensional dynamic model was used to systematically examine the effect of graphene on the performance of air gap membrane distillation (AGMD) process. Moreover, we introduced the novel net water flux parameter considered the existence of graphene sheet in the polymer membrane nanocomposite to properly evaluate the graphene nanoparticle effect in AGMD system.

Recycling of red mud as a catalyst for complete oxidation of benzene

심왕근,나재운,정호영,박영권,정상철,김상채 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-

In this work, we investigated waste red mud (WRM) generated from industrial processes as a potential catalyst support for the complete oxidation of toxic organic compounds. Two different types of red mud based catalysts were prepared using calcination (CRM) and hydrochloric acid aqueous solution (HRM) pretreatments. In addition, HRMs loaded with different amounts of palladium were prepared and examined for their catalytic behaviors. For comparison, aluminas (γ-Al2O3) loaded with different amounts of palladium were also used. The catalyst samples prepared were characterized by using nitrogen adsorption, ICP-AES, TPR, XRD, FT-IR, and FE-TEM to examine their textural and chemical characteristics. The catalytic activity of the samples used depended on the pretreatment techniques applied, lattice oxygen mobility, the type of supports, and the loading amount of palladium. It was also interesting to note that water vapor in the feed stream inhibits catalytic activity for the complete oxidation of benzene.

선소 해역 부근의 해양 환경 개선 사업 고찰 및 주민들의 환경 인식 조사에 대한 연구

심왕근(Wang Geun Shim),박세라(Se Ra Park),김상채(Sang Chai Kim) 한국환경교육학회 2009 環境 敎育 Vol.22 No.1

The relationship between marine environmental improvement and environmental perception of the inhabitants was investigated. For this purpose, the seawater and bottom materials were analysed. Apart from this, the questionnaire surveys were also conducted around the Sun-so coastal area. In order to examine the improvement in the marine environment, 12 monitoring sites, which are located around Sun-so coast and can be divided into two parts such as inland (GW1-GW6) and outland (GW7-GW12) sea, were chosen. All the collected samples were analyzed to find out the quality of seawater (temperature, pH, salinity, dissolved oxygen: DO, chemical oxygen demand: COD and suspend solid: SS), nutrients (total nitrogen: TN and phosphate: PO₄-P) and bottom materials (COD, volatile solids: VS) as per the standard analytical procedures. In addition, the questionnaire mainly focused on the following three factors: 1) social economy, 2) dependent environmental awareness and 3) independent environmental awareness related with the environmental education. The monitoring studies indicated that the marine environment of the Sun-so coast showed various trends for analyzing parameter. No significant temporal changes in temperature, pH and salinity were observed. However, the other parameters showed decreasing (COD, SS, TN, PO₄-P and VS) and increasing (DO) trends according to the quality of seawater and bottom materials. The questionnaire survey clearly showed that most of the residents in Sun-so recognized the improvement of marine environment as compared with the situation experienced in the past. The dredging project which is closely related with economic and living conditions of the local residents led to alter the environmental perceptions and attitudes. The survey also indicated that the inhabitants perceived the necessity of the environmental education (87% of respondents) and preferred regular schooling (55% of respondents) as effective and practical education methods.