죽탄을 이용한 불소이온 제거에 관한 연구

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In recent, The fluorine fixed quantity in the drinking water is very small amount very with 0.5 ~1.0 mg/L and the symptom of existence at the time of fluorine composure symptoms appears at 1 ~ 2 mg/L consistency. A variety of defluoridating agents such as activated alumina, lime, zeolite, carbon, clay minerals, fly-ash and spent catalyst have been used for the reduction of the fluoride content of potable water. Activated carbon prepared from waste materials such as coconut, sawdust and coffee waste, either by direct carbonisation of by sulfuric aced treatment, have also been evaluated after aluminium sulfate impregnation. However, the removal of fluoride from the spiked water samples using these methods was found to be about 80% and their removal capacity decreased sharply in saline conditions. Overall these were found to be unsuitable due to their poor attritional characteristics and low capacity for fluoride removal. The fluorine removal research for old time was researched about the water where becomes the materials of the drinking water with like this reason and was come. In this paper, the adsorption behavior of nitrate anion and mechanism in aqueous solution investigated using FeCl3-dipped charcoal(FT), HCl-treated charcoal(AT) and FeCl3-HCl treated charcoal(FTAT). Also, The influence of various parameters such as F- concentration, adsorbent dose, repeated adsorption and temperature has been studied.
The removal efficiency of fluoride was increased with increasing of dosage of adsorbents. The F- removal was not affected by the pH under the experiment range of pH. The degree of removal was found to be dependent on temperature and it is increased as the temperature decrease. It was found that the obtained charcoal had the ability to absorb nitrate and fluoride anion but not sulfate and phosphate anions. The adsorbents was regenerated using KCl solution, and recovery was about 76.6% at 1 M of KCl. Batch adsorption studies have shown that the adsorption reaction can be described by the second-order reversible reaction. The process of uptake obeys both Langmuir and Freundlich isotherms. The thermodynamic parameters were also calculated to elucidate the adsorption mechanism.
The values of △Ho and △So were obtained from the slope and intercept of the van't Hoff plots of in b vs 1/T. The negative value of the △Ho suggests the exothernic nature of adsorption. The negative values of △Go indicates the spontaneous nature of adsorption of F- by the adsorbents(AT and FTAT). The negative value of △So shows that the freedom of molecules of F- is more restricted in the charcoal particles(AT and FTAT) than in solution. The plots of the in C vs 1/T at different surface loading were found to be linear and △Hx values were calculated from the slope of the curves. The value of the △Hx was almost constant and was independent of surface loadings. The order of magnitude of the value indicates a weakend chemical mechanism for the adsorption of F- on to AT and FT.
Alternative Title
A Study on the Removal of Fluoride by Carbonaceous Materials Prepared from Bamboo
Alternative Author(s)
Mun, kyung Do
일반대학원 환경학과
Awarded Date
Table Of Contents
Ⅰ. 서 론 1

Ⅱ. 이론적 고찰 3

2-1. 불소 및 불소화합물 3
1) 이화학적 성질 3
2) 인체 영향 4
3) 배출원 및 배출기준 5

2-2. 불소의 처리기술 6
1) 석회침전법 6
2) Alum을 이용한 불소제거 8
3) 폴리염화알루미늄을 이용한 불소제거 9
4) 회토류 금속을 이용한 폐수 중 불소제거 10

2-3. 흡착 11
1) 활성탄 흡착의 개념 12
2) 활성탄 흡착의 특성 13
(1) 분자구조 13
(2) 표면장력 13
(3) 용해도 14
(4) pH와 이온성 14
(5) 농도 14
(6) 온도 15
(7) 흡착등온선 15
3) 활성탄의 흡착용량 16
4) 활성탄 흡착탑 17
5) 활성탄의 재생 18

2-5. 선택계수(selectivity coefficient) 20

2-6. 흡착 등온선 21

Ⅲ. 실험방법 및 분석 24

3-1. 염화철 죽탄 시료의 제조 24

3-2. 불소이온 흡착실험 24
1) ST 실험 24
2) AT 실험 25
3) FTAT 실험 25
4) FT 실험 26

3-3. 분석항목 및 측정방법 27

Ⅳ. 결과 및 고찰 28

4-1. 불소이온 제거 28
1) 대나무 탄화물의 물성 28
2) ST의 열처리 온도에 따른 불소이온 흡착 33
3) ST의 투입량에 따른 불소이온 흡착 34
4) AT의 열처리 온도에 따른 불소이온 흡착 35
5) AT의 투입량에 따른 불소이온 흡착 37
6) AT의 진탕 속도에 따른 불소이온 흡착 38
7) FTAT의 열처리 온도에 따른 불소이온 흡착 39
8) FTAT의 투입량에 따른 불소이온 흡착 40
9) FTAT의 진탕 속도에 따른 불소이온 흡착 41
10) FT의 열처리 온도에 따른 불소이온 흡착 42
11) FT의 투입량에 따른 불소이온 흡착 43
12) FT의 진탕 속도에 따른 불소이온 흡착 44
13) FT의 흡착온도에 따른 불소이온 흡착 45
14) FTAT의 흡착등온선 50
15) FT의 Langmuir와 Freundlich model 51
16) 흡착속도 상수 54
17) 온도가 불소이온 흡착에 미치는 영향 57

Ⅴ. 결 론 62

1. 대나무 탄화물의 물성 62

2. ST를 사용한 불소이온 흡착제거 62

3. AT를 사용한 불소이온 흡착제거 62

4. FTAT를 사용한 불소이온 흡착제거 63

5. FT를 사용한 불소이온 흡착제거 63

조선대학교 대학원
문경도. (2010). 죽탄을 이용한 불소이온 제거에 관한 연구.
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General Graduate School > 3. Theses(Master)
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