• Bulletin of the Korean Chemical Society
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• 제30권10호
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• pp.2249-2252
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• 2009

The clay-based Fe-bearing catalyst was successfully prepared through ion-exchange reaction and applied as heterogeneous catalyst for discoloration of acid fuchsine (AF) in an aqueous solution by Fenton-like reaction. Experimental results demonstrated that the AF discoloration ratios increased by increasing Fe-loaded clay dosage and initial $H_2O_2$ concentration, and by decreasing the pH, respectively. The lower the initial AF concentration, the shorter the reaction time needed to achieve complete discoloration of AF. Comparative studies indicated that AF discoloration ratios were much higher in presence of Fe-loaded clay and $H_2O_2$ than those in presence of $H_2O_2$, raw natural clay or Fe-loaded clay only and raw natural clay and $H_2O_2$ jointly. After AF discoloration, there existed no new phases in the clay samples detected by XRD and no change in the clay crystal morphology observed by SEM. A mechanism proposed suggested adsorption and Fenton-like reaction were responsible for discoloration of AF.

• Advances in environmental research
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• 제9권3호
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• pp.161-173
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• 2020

The removal of two dyes, namely Methylene Blue (MB) and Reactive Brillant Red (RR) from aqueous solution was investigated using magnetite iron coated pumice (MIP) composite in the Fenton-like oxidation process. A weight ratio of 2.5 g (with the molar ratio of Fe³⁺ to Fe²⁺ to be 2) (5%) of iron to the total pumice (50 g) was enabled during synthesis of catalyst. Surface composition and characteristics of the catalyst were assessed by SEM-EDX, FT-IR, Raman spectral analysis. The effect of the amount of pumice solely used or MIP, H₂O₂ concentration, pH and initial concentration of MB or RR dyes on Fenton-like process efficiency was investigated. EDAX spectrums of pumice and MIP showed that oxygen and silisium are the major elements. The Fe content of MIP increased to 2.24%. SEM, FT-IR and Raman spectrums confirmed the impregnation of Fe on pumice surface. The experimental results revealed that high removal rates of dyes could be obtained using MIP that demonstrated a higher stability for removal of MB dye. pH affected the removal efficiency of both dyes and the degradation of both dyes was sharply dropped when pH was increased above 4. The removal of dyes did not significantly change with increasing H₂O₂ concentration. Degradation rates of both MB and RR dyes increased 3.3 and 2.8 times with the use of MIP compared to pumice alone, respectively. Furthermore, MIP enabled a good removal efficiency at higher dye concentrations. It can be emphasized that MIP composite can be used in the heterogeneous Fenton-like systems considering the economic and easily separation aspects.

• 대한환경공학회지
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• 제37권6호
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• pp.340-348
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• 2015

본 연구에서는 해양퇴적물 내에 자연적으로 존재하는 철 성분과 과산화수소수를 이용한 유사-펜톤 공정에서 퇴적물의 입자크기 별 분율 내의 PCBs제거효율을 파악하고 여러 가지 계면활성제(Triton X-100, Tween 60, Tween 80)의 동시 사용에 따른 효율을 실험하였다. 퇴적물 시료를 1%와 15%의 과산화수소수와 Triton X-100, Tween 60, Tween 80을 이용하여 1시간 동안 처리 시 tPCBs제거효율은 24.1~46.7%로 나타났다. 퇴적물의 입자 크기, 오염형태에 따라 제거 효율의 차이는 있었으나, 과산화수소수와 계면활성제를 동시에 사용하여 처리한 퇴적물의 tPCBs 농도는 수저준설토사 유효활용 기준을 충족하였다. 또한 적절한 계면활성제를 유사-펜톤 반응에 첨가제로 사용시 낮은 산화제 농도 조건에서도 보다 높은 산화제 농도 조건에서의 제거효율과 유사하게 나타났다. 그러므로 유사-펜톤 반응과 계면활성제에 의한 처리에서 해양오염퇴적물의 미세입자에 함유된 PCBs를 효율적으로 정화하는 것이 가능한 것으로 확인되었다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 1999년도 정기총회 및 춘계 공동 학술발표회
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• pp.82-83
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• 1999

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.239-242
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• 2002

Removal of phenanthrene by electrokinetic (EK) method combined with Fenton-like process was studied in a model system. Sand and phenanthrene were selected as a model soil and a representative PAH. Sand was contaminated at the concentration of 500 mg phenanthrene/kg dry sand. Bentonite and kaolinite were inserted into the space between reservoir and contaminated soil. When hydrogen peroxide supplied to a soil system from the anode reservoir was transported through the soil by EK process, the Fenton-like reaction was occurred by naturally existing iron minerals in soil. When hydrogen peroxide was supplied into the system, it showed higher removal efficiency than when just water was used. Maximum removal efficiency of phenanthrene was 81.2 % for 7 days.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2000년도 추계학술대회
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• pp.136-139
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• 2000

Fenton-like oxidation of para-nitrophenol(PNP) was studied using hydrogen peroxide iii combination with steeler's dust substituted for ferrous iron in Fenton's reaction. Various factors critical in the degradation of PNP were studied, including hydrogen peroxide dosage, concentration of steeler's dust. and initial pH. Experimental results showed that 1,000mg/L PNP and its oxidation intermediate could be mostly decomposed within 30m1n by 10g/L steeler's dust, 0.25% hydrogen peroxide, and initila pH of 3.0. The reaction rate constant (k) of CODcr concentration were calculated with the addition of steeler's dust(0.0059 min$^{-1}$ (g/L)$^{-1}$ ) and hydrogen peroxide(0.2965 min$^{-1}$ (%)$^{-1}$ ), respectively.

• 한국물환경학회지
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• 제21권5호
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• pp.505-510
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• 2005

The objective of this study was to remove non-biodegradable matters and ammonia ion in livestock wastewater using Fenton oxidation and Zeolite adsorption process. After coagulation process as 1st treatment, non-biodegradable matters remained after 1st treatment were removed by using OH radical produced in Fenton oxidation process. Zeolite as cation adsoption process was used to remove ammonia ion in 2nd treatment water. As a result of treatment using these processes, NBDCOD removal efficiency was over 90% and ammonia ion was almost removed. Most aromatics or polynuclear aromatics like benzene, phenol and scatol in livestock wastewater wasn't detected after Fenton oxidation process.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.318-321
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• 2003

This study explored the feasibility of applying Electrokinetic-Fenton process(EK-Fenton process) to remediation of contaminant sorbed on the soil possessed low-permeability. The addition of 0.01 N H$_2$SO$_4$ in the anode reservoir for the $H_2O$$_2$stabilization improved the stabilization of $H_2O$$_2$and the treatment effect of phenanthrene across the entire soil specimen. The use of $H_2O$$_2$and dilute acid as anode purging solution is a promising method treating of HOCs in low-permeability subsurface environments.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 1997년도 총회 및 춘계 학술발표회 논문집
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• pp.53-56
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• 1997

오염된 토양의 복원기술 개발의 일환으로 폐수의 처리 등에 많이 이용되어온 Fenton-like oxidation을 petroleum으로 오염된 토양의 in-situ/ex-situ remediation을 위한 data 축적을 위해 실험실상에서 적용하여 보았다. 천연 토양속에 흔히 존재하는 철광석의 한 형태인 magnetite, goethite를 이용해 Fenton-like oxidation을 유도하여 silica sand에 오염된 kerosene의 분해를 잔존 TPH의 분석을 통하여 확인하였다. 초기 kerosene의 농도, 과수의 농도, 철광석의 양을 변수로 하여 최적 처리조건을 구하기 위한 실험을 진행하였다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제6권3호
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• pp.13-20
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• 2001

본 연구에서는 고농도 유류오염토양 처리를 위해 ${H_2}{O_2}$/$Fe^0 시스템을 이용한 Fenton-like oxidation을 제시하였다. 주요 반응조건인 초기 PH, $Fe^0 및 ${H_2}{O_2}$ 주입량과 초기 오염농도를 변화시켜가며 본 산화처리 시스템의 반응특성을 회분식 실험을 통하여 알아보았다. 유류 오염물은 디젤을 사용하였으며 오염농도는 가스 크로마토그래피를 사용하여 TPH (Total Petroleum Hydrocarbon)로 나타내었다. 제거효율을 보면 적정 ${H_2}{O_2}$/$Fe^0 주입조건인 10% ${H_2}{O_2}$+ 20% Fe$^{0}$ 에서 반응시간 24이내에 약 65% 이상의 제거율(초기 TPH 농도 : 10,000mg/kg)을 나타내었으며, 초기 pH조건은 높은 제거효과를 얻기 위해서 3~4범위이내가 적정함을 알 수 있었다. 기존의 과산화수소의 분해촉매로 사용하는 철 염($FeSO_4)과의 비교실험에서는 $Fe^0를 촉매로 사용하였을 때 유류오염토양의 화학적 산화 처리가 처리효율과 경제성에서 더 효과적임을 알 수 있었고, 특히 고농도 오염토양 처리에서 더 유리한 것으로 나타났다.