Polydiacetylene을 이용한 체온 측정 물질의 제조

김희선 ( Huiseon Kim ),허은진 ( Eunjin Heo ),신민재 ( Min Jae Shin ) 한국공업화학회 2021 공업화학 Vol.32 No.2

Considering the current COVID 19 pandemic, herein, we developed a material that can be used to fabricate a device for checking the body temperature of a person who has been exposed to influenza or corona virus. This material was formed by mixing pluronic F127 (F127) with a polydiacetylene (PDA) vesicle, which was formed with 10,12-pentacosadiynoic acid. The color of the system started to change from blue to light purple at 37 ℃, finally turning reddish at 40 ℃. Thus, the developed material can be used to detect changes in body temperature, and thus, detect signs of fever. The mixing ratio of the PDA vesicle and F127 was an important factor for controlling the temperature at which the color change started. The results showed that the color change accompanied by the separation of the PDA vesicle with F127. We believe that this phenomenon plays an important role in reducing the conjugation length in the double and triple bond of PDA.

개량한 왕겨 바이오차에 대한 암모늄태 질소의 흡착능 평가

김희선(HuiSeon Kim),김민진(MinJin Kim),박도균(DoGyun Park),윤석인(SeokIn Yun),장은숙(EunSuk Jang),신중두(JoungDu Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계

This experiment was conducted to evaluate its adsorption capacity of modified rice hull biochar. The biochar treated with 6M KOH solution was carbonized at 850℃. The maximum adsorption of NH4 + -N in aqueous solution and maximum removal rate were 0.65 mg g -1 and 56.3 %, respectively, in 6M KOH modified biochar. For palm biochar, the maximum adsorption and removal rate of PO4 - -P were 0.67 mg g -1 and 56.0%, respectively. It was observed that NH4 + -N in aqueous solution can be only adsorbed in rice hull modified biochar, and PO4 - -P in palm biochar. The sorption of NH4 + -N to 6M modified rice hull biochar was significantly fitted(p<0.001) by Langmuir isotherm model because it was observed that dimensionless constant (RL) was 0.39. The maximum adsorption amount (qm) and binding strength constant (b) were calculated as 0.65 mg g -1 and 0.057 mg L -1 , respectively. Furthermore, the leaching experiment of modified rice hull biochar mixed with soil need to be more elucidated in the future.

바이오차 펠렛 완효성 비료의 적정 시용량 선정

김희선(HuiSeon Kim),김민진(MinJin Kim),윤석인(Seok-In Yun),신중두(JoungDu Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계

본 연구의 목적은 배추재배 시 바이오차 펠렛 완효성 비료의 적정 시용량 구명을위해 수행하였다. 바이오차 팰릿 완효성 비료는 돈분과 바이오차 혼합비(6 : 4)로조제한 후 N : P : K 용액을 추가하여 총 질소 함량이 약 9%가 되도록 조제하였다. 본 시험의 처리는 대조구, 추천 질소 시비량의 바이오차 펠렛 완효성 비료 질소기준 40%(N 40%), 바이오차 펠렛 완효성 비료 질소기준 40% + 0.07M MgO(N 40% + 0.07M MgO)와 바이오차 펠렛 완효성 비료 질소기준 60%(N 60%) 시용구로 구성되어있다. 배추의 생육기간동안 토양 중 NH4-N, NO3-N, P2O5, K2O의 농도변화를 분석하였다. 실험 결과로서 토양중의 NH4-N, NO3-N, K2O 함량은 대조구와비교하여 N 40%처리구가 유의차를 보였다. 토양 중의 P2O5농도는 바이오차 팰릿완효성 비료의 처리구들 중 N 40%가 가장 높았다. 배추의 생체중은 N 40% 처리구는 대조구와 비교하여 유의적인 차이가 나지 않았으며(p>0.05), N 40% + 0.07M MgO 처리구와 N 60% 처리구는 대조구에 비해 감소하였다. 농경지에서 배추재배시 추천 질소 시비량 기준의 N 40%가 적정 시용량이라 판단된다.

KOH 농도 및 탄화온도가 왕겨 활성 바이오차의 NH₄-N 흡착능 향상에 미치는 영향

김희선 ( Huiseon Kim ),윤석인 ( Seok-in Yun ),안난희 ( Nanhee An ),신중두 ( Joungdu Shin ) 한국환경농학회 2020 한국환경농학회지 Vol.39 No.3

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 (R_L) was 0.97 and 0.66 at 600℃ and 800℃ of pyrolysis temperatures, respectively. The maximum adsorption amount (q_m) 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.

배추재배 시 바이오차 펠렛 완효성 비료의 적정 시용량 구명

김희선(HuiSeon Kim),윤석인(SeokIn Yun),장은숙(Eunsuk Jang),신중두(JoungDu Shin) 유기성자원학회 2019 유기물자원화 Vol.27 No.1

본 연구의 목적은 배추재배 시 바이오차 펠렛 완효성 비료의 적정 시용량 구명을 위해 수행하였다. 바이오차 팰릿 완효성 비료는 돈분과 바이오차 혼합비(6 : 4)로 조제한 후 N : P : K 용액을 추가하여 총 질소 함량이 약 9%가 되도록 조제하였다. 본 시험의 처리는 대조구, 추천 질소 시비량의 바이오차 펠렛 완효성 비료 질소기준 40%(N 40%), 바이오차 펠렛 완효성 비료 질소기준 40% + 0.07M MgO(N 40% + 0.07M MgO)와 바이오차 펠렛 완효성 비료 질소기준 60%(N 60%) 시용구로 구성되어있다. 배추의 생육기간동안 토양 중 NH 4 -N, NO 3 -N, P 2 O 5 , K 2 O의 농도 변화를 분석하였다. 실험 결과로서 토양중의 NH 4 -N, NO 3 -N, K 2 O 함량은 대조구와 비교하여 N 40%처리구가 유의차를 보였다. 토양 중의 P 2 O 5 농도는 바이오차 팰릿 완효성 비료의 처리구들 중 N 40%가 가장 높았다. 배추의 생체중은 N 40% 처리구는 대조구와 비교하여 유의적인 차이가 나지 않았으며(p>0.05), N 40% + 0.07M MgO 처리구와 N 60% 처리구는 대조구에 비해 감소하였다. 농경지에서 배추재배 시 추천 질소 시비량 기준의 N 40%가 적정 시용량이라 판단된다. This experiment was conducted to select an optimum application rate of blended biochar pellet as slow release fertilizer during cabbage cultivation. The blended biochar pellet made with a combination(4:6) of biochar and pig manure compost with unloading N, P, K solutions for adjusting about 9% of total nitrogen(TN). The treatments were consisted of the control as recommended application rates for cabbage cultivation in National Institute of Agricultural Sciences, N 40%, N 40% and 0.07M MgO and N 60 % of the blended biochar pellet, respectively, based on nitrogen application of recommended rates to cabbage cultivation. Changes of NH 4 -N, NO 3 -N, P 2 O 5 and K 2 O concentrations in the soil and growth characteristic and yield components were investigated and observed during the cabbage cultivation. The experimental result shown that contents of NH 4 -N, NO 3 -N and K 2 O of soil in the N 40% were significantly difference(p<0.01) with the control. P 2 O 5 concentrations of soil in the N 40% were highest among the treatments. The fresh weight per cabbage in the N 40% was not significantly different(p>0.05) from the control, but in the N 40% and 0.07M MgO and N 60% was lower than that of the control. It was considered that an optimum blended biochar application rate for cabbage cultivation was 40% of recommended nitrogen application.

토마토 재배 시 바이오차 펠렛 완효성 비료의 적정 시용량 구명

김민진(MinJin Kim),김희선(HuiSeon Kim),박도균(DoGyun Park),이창규(ChangGu Lee ),윤석인(Yun SekIn),장은숙(EunSuk Jang),신중두(JoungDu Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계

본 연구의 목적은 토마토 재배 시 바이오차 펠렛 완효성 비료의 적정 시용량을 구명하기 위해수행하였다. 바이오차 펠렛 완효성 비료는 돈분과 바이오차를 (6 : 4)로 혼합하고 주요 양분을 분사하여 조제하였다. 바이오차 펠렛 완효성 비료 처리구는 질소기준 40%(N 40%), 50%(N 50%), 70%(N70%)로 구분하여 처리하였고, 전량 기비로 시용하였다. 대조구의 시비량은 11.6-10.3-4.1 kg 10a-1 (N-P-K)을 기비와 추비로 나누어 2회 분시 하였고, 퇴비는 440 kg 10a-1를 기준으로 전량 기비로 시용하였다. 그 결과 토양 중 질소 Balance를 산정하였을 때 바이오차 펠렛 N 40% 처리구에서80%로 가장 높게 산정 되었으며, N 50% 처리구에서는 63.5%로 산정 되었다. P2O5의 농도는 전체생육기간 동안 대조구가 가장 높은 값을 보였고, K2O의 함량은 토마토 재배시기가 지남에 따라 점차적으로 감소하며, 처리 후 10일을 기점으로 감소하는 경향을 보였다. 토마토 수량은 대조구와 비교하여 N 50% 처리구에서 유의차가 없었다. 따라서 토마토 재배 시 바이오차 팰렛 완효성 비료의 적정시용 비율은 관행적인 시비량의 절반인 질소기준 약 6 kg 10a -1인 것으로 판단된다.

옥수수재배 시 바이오차팰렛 시용량에 따른 토양 화학성 변화에 미치는 영향

박도균(DoGyun Park),김혜원(HyeWon Kim),김희선(HuiSeon Kim),장은숙(EunSuk Jang),신중두(JoungDu Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.춘계

Objectives of this experiment were to investigate the changes of soil chemical properties and estimate carbon sequestration according to application rates of blended biochar pellet during corn cultivation. The treatments were MgO (40% N + 0.07M MgO), and 60% of blended biochar pellet (60% N) based on the recommended application rates of fertilizer for corn cultivation by National Institute of Agricultural Sciences. Application amounts of 10a -1 and 440kg 10a -1 , respectively. Nitrogen fertilizer was separately applied at 2 times as basal and additional application and the other were applied with whole basal application before transplanting. However, blended biochar pellets were applied as whole basal application with different rates. Chemical analysis was performed in the runoff water and soil, and then measured fresh biomass weight for biomass growth responses of corn to different blended biochar application rates. For the results of this experiment, it shown that the residual contents of NH4-N, NO3-N, P2O5 and K2O in the treatments of blended biochar application rates were lower than those of the control through corn cultivation periods. However, the K2O contents in the treatments were higher than those in the control at 21 days and 51 days after corn transplanting. NH4-N and NO3-N contents of runoff water in the control appeared to be higher than those of the blended biochar pellet treatments, but PO4-P and SiO2 contents did not significantly different (p>0.05) between the control and blended biochar application plots. Carbon sequestration (60.0 kg 10a -1 ) did not significantly different between the control and 40% N + 0.07M MgO treatment plot. Fresh biomass weights in the control were not significantly different with all the treatments except for the 60% N even if reduction of nitrogen fertilizer application were decreased 60% relative to the control. Therefore, it was decided that application of blended biochar pellet for corn cultivation was potential benefit to enhance the nutrient use efficiency as well as reduction of the chemical fertilizer mounts for corn cultivation in agricultural practices.

벼 재배 시 바이오차 펠렛 비료 시용에 대한 농업환경 영향 평가

신중두 ( Joungdu Shin ),박도균 ( Dogyun Park ),김희선 ( Huiseon Kim ),최은정 ( Eunjong Choi ),이선일 ( Sunil Lee ),박상원 ( Sangwon Park ),박광호 ( Kwang-ho Park ),정인호 ( In-ho Jung ) 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-

Objective of this experiment was to investigate the agro-environmental effect in rice paddy and water system during rice cultivation. The treatments consisted of control (9-4.5-5.7 kg 10a^-1, N-P-K and 250 kg 10a^-1 of pig manure compost application), supplemented rice hull black carbon pellet (SRHBPN-40%, 3.6 kg 10a^-1 based on TN) and activated palm biochar pellet (SAPBPN-40%, 3.6 kg 10a^-1 based on TN). The results showed that NH₄⁺ -N concentrations were abruptly decreased at 7 days after rice transplant, while low NO₃^--N concentrations were continuously enumerated until 58 days after transplant in the paddy water regardless of treatments. PO₄^--P concentrations in the control were higher than the other treatment through rice cultivation periods except for 7 days after transplant. K+ concentrations were continuously decreased with delaying the growth period. SiO₂ concentrations did not significantly different among the treatment. For the paddy soil,the mineralization and nitrification rates were abruptly decreased at 37 days and 15 days after transplant in whole treatments, respectively. P₂O₅ concentrations were eventually increased through 87 days of cultivation periods and then decreased until harvesting time. K₂O concentrations were abruptly increased from 87 days after transplant to the harvest in whole treatments. The highest carbon sequestration was 1.9 tonnes ha^-1 in the MRHBPN-40%, For the greenhouse gases, CH₄ emissions in the APBPN-40% were observed to be lowest, while N₂O emissions were lowest until 37 days after transplant in the MRHBPN-40%. For growth responses, the grain yield was not significantly different between the control and MRHBPN-40%, but highest straw yield was 12.18 tonnes ha^-1. Therefore, modified supplemented biochar pellets have a potential ability to utilize for reducing agricultural impacts as well as greenhouse gas mitigation for the rice cultivation.