特集
学生の研究活動報告−国内学会大会・国際会議参加記 18
Report on 47th Annual
Conference of Japan Society
on Water Environment
アリ・ラーマン
Ari RAHMAN
環境ソリューション工学専攻博士課程
2年
1．Preface
Fig. 1 Chemical structure of Reactive Procion
Brilliant Red H-EGXL
Industry, Japan). While Reactive Procion Brilliant Red
I have presented my research by poster presentation
with the title of “Investigation of Maximum Capacity
H-EGXL and Reactive Procion Yellow H-EXL were
obtained from DyStar Japan Ltd.
of Clay Adsorbents for Decolorization of Reactive Procion Dyes” in Osaka Institute of Technology, Omiya
2. 3
Campus from March 11th to 13th, 2013.
Batch method was used for adsorption experiment.
1.00 g of adsorbent and different initial dye concentra-
2．Summary of Presentation
2. 1
Adsorption experiment
tions (0−200 mg/L) were placed into a series of 50 mL
Introduction
polypropylene centrifuge tube. The solution (dye and
Colored wastewater often causes environmental prob-
adsorbent) were shaken at 150 rpm at room temperature
lems that are faced by textile industry as a result of
for 16 hours with a shaker type SN-200 SD (Nissin, Ja-
dyeing and printing process. It contains various chemi-
pan) and followed by centrifugation process at 2900
cal compounds especially residue of dye. Dye without
rpm for 15 minutes with Avantitm HP-25 centrifuge
appropriate treatment would become a serious problem
(Beckman Coulter, USA). The absorbance of filtrate so-
for environment not only for aquatic living but also for
lutions were measured at the peak of wavelength
aesthetic. (Slokar and Marechal, 1998). Clay mineral as
( λ max Procion red＝535 nm λ max Procion yellow＝
a natural resource receives much attention for removing
416 nm ) with UV-Visible Spectrophotometer ( Shi-
pollutants from wastewater by adsorption treatment due
madzu, Japan). The adsorption capacity then was calcu-
to much availability and cheaper than commercial acti-
lated by following the equation below :
vated carbon. This research investigated the maximum
qe＝
capacity of various clay adsorbents for decolorization
(Co−Ce)V
m
of reactive dyes from solution at the same duration of
Where : qe is the adsorption capacity, the dyes uptake
batch adsorption process.
by a unit weight of adsorbent (mg/g), Co is the initial
concentration of dye (mg/L), Ce is the final concentra-
2. 2
tion of dye (mg/L), V is the volume of solution (L) and
Adsorbents and dyes
Various clay adsorbents were received from different
m is the weight of adsorbent (g).
companies such as : clinoptilolite (Sun-zeolite Industry,
Japan), mordenite (Shin Tohoku Chemical Industry, Ja-
2. 4
Result and discussion
pan), sepiolite, bentonite, kaolin (Wako Chemical In-
As shown on Table 1, synthetic talc has the highest
dustries, Japan ) and synthetic talc ( Kurosaki Hakudo
maximum adsorption capacity (qmax ) than other adsorb-
― ４１ ―
Table 1
Adsorbents
Maximum monolayer capacity（qmax）
and Langmuir isotherm line of synthetic talc are shown
Procion Brillant Red H-EGXL
on Fig. 2 and Fig. 3. The differences in specific surface
KL
qmax
（mg/g）（L/mg）
R2
Procion Yellow H-EXL
qmax
KL
（mg/g）（L/mg）
R2
area, ionic type and zeta potential value are the factor
which influencing the maximum adsorption capacity of
Clinoptilolite
2.346
0.0028
0.9948
3.598
0.0015
0.6104
Mordenite
1.488
0.0312
0.9927
3.295
0.0114
0.8400
Sepiolite
1.573
0.0218
0.9761
5.670
0.0057
0.9259
clay adsorbents. Bentonite has the largest specific sur-
Bentonite
3.494
0.0197
0.9863
7.490
0.0110
0.9890
face area of 724.49 m2 /g, synthetic talc has 156 m2 /g
Kaolin
3.387
0.3034
0.9982
4.694
0.2220
0.9915
Synthetic Talc 8.652
0.1222
0.9312
11.458
0.0768
0.9640
while kaolin has only 2.18 m2/g of specific surface area.
However kaolin has more positive zeta potential ( −
KL is the Langmuir capacity factor
37.324 mV ) than other adsorbents ( lower than − 50
mV ) , which made more easily to interact with dye
molecules. Reactive anionic dyes have negatively surface charge due to the presence of sulfonic groups
(SO3−) on the chemical structure of dye (Fig. 1). On the
other hand clinoptilolite, mordenite, sepiolite and bentonite are categorized into cationic exchanger. Reactive
dyes that were used in this research are typically anionic dyes. Accordingly these clays were inferred to
have less adsorption capacity than synthetic talc.
Fig. 2 Adsorption capacity and Langmuir isotherm line of synthetic talc for Procion Red HEGXL removal
2. 5
Conclusion
The result showed that Synthetic talc has the highest
maximum adsorption capacity with 8.652 mg/g for removal of Reactive Procion Brilliant Red H-EGXL and
11.458 mg/g for removal of Reactive Procion Yellow
H-EXL.
3．Acknowledgment
I would like to express my gratitude for the opportunity doing research presentation in the 47th Annual
Conference of Japan Society on Water Environment. It
was a good experience and became valuable lesson for
Fig. 3 Adsorption capacity and Langmuir isotherm line of synthetic talc for Procion Yellow
H-EXL removal
further research.
Reference
ents, 8.652 mg/g for decolorization of Reactive Procion
Brilliant Red H-EGXL and 11.458 mg/g for Reactive
Slokar Y M and Marechal Maycen Lee. Methods of decolorization of textile wastewaters. Dyes and pigments 1998 ;
Vol.37, No.4, pp : 335−356.
Procion Yellow H-EXL removal. Adsorption capacity
― ４２ ―