ᚑくᄢቇℂᎿቇ⎇ⓥႎ๔
J. Fac. Sci. Tech., Seikei Univ.
Vol.46 No.㧞 (2009) pp.47-51
㧔ᣂછ⠪ߩ⺰ᢥ㧕<P(G ♽ጀ⁁ⶄ᳓㉄ൻ‛ߩวᚑߣ᦭ኂ㒶ࠗࠝࡦๆ⌕․ᕈᧄㇹ ᾖਭ 㧘ኅ᧛ ᱞᔒ 㧘ጊ㦮 ᷕม Synthesis of Zn-Fe layered double hydroxide and its adsorption ability for several
harmful anions
Teruhisa HONGO , Takeshi IEMURA , Atsushi YAMAZAKI ABSTRACT㧦A zinc-iron layered double hydroxide (Zn-Fe LDH) with sulfate as the interlayer anion has
been synthesized by the coprecipitation method. The adsorption ability of the Zn-Fe LDH was studiedfor several harmful anions (phosphate, chromate, fluoride, selenate and arsenate) in aqueous solution, andit showed high selectivity for phosphate, chromate and selenate ions. The Zn-Fe LDH was found to bestable over a wide pH range (pH = 2-12). The adsorption ability for phosphate ions depends on theinitial pH and it increases with decreasing pH.

Keywords㧦Layered double hydroxide, Adsorption, Harmful anion, Adsorbent(Received September 24, 2009)ߒߚ߇ߞߡ㧘㓁ࠗࠝࡦ⒳߿㒶ࠗࠝࡦ⒳ࠍᄌ߃ࠆߎߣߦࠃ

㧝㧚ߪߓ߼ߦ

ࠅ㧘ᄙߊߩห᭴ㅧ‛⾰ࠍᓧࠆ੐߇ߢ߈ࠆ‫ޕ‬LDHs ߪ㧘ࡉ᳓ⅣႺᳪᨴ໧㗴߇㑐ᔃࠍ㓸߼ࠆࠃ߁ߦߥߞߡਭߒ޿߇㧘࡞࡯ࠨࠗ࠻ߦ㘃ૃߒߚ᳓㉄ൻ‛ M2+(OH)2 ߩ M2+ߩ৻ㇱࠍM3+ߢ⟎឵ߔࠆߎߣߦࠃࠅ↢ߕࠆᱜ㔚⩄౎㕙૕ၮᧄጀࠍㄭᐕߦ߅޿ߡ߽ᳪᨴ᳓ߩᵺൻᛛⴚߦ㑐ߔࠆႎ๔߇ᢙᄙߊ
1-4‫ޕ‬㋦㧘࠾࠶ࠤ࡞㧘੝㋦ߘߒߡࠞ࠼ࡒ࠙ࡓࡎࠬ࠻ጀߣߒ㧘ߎߩᱜ㔚⩄ࠍ⵬ఘߔࠆ㒶ࠗࠝࡦߣጀ㑆᳓

ߩࠃ߁ߥ㊀㊄ዻࠗࠝࡦߦ㑐ߒߡߪ㧘࠯ࠝ࡜ࠗ࠻߿☼࿯㋶߆ࠄᚑࠆࠥࠬ࠻ጀ߇ࡎࠬ࠻ጀߣ੤੕ߦⓍጀߒߚ᭴ㅧࠍᜬ‛߇ๆ⌕೷ߣߒߡᣢߦታ↪ൻߐࠇߡ޿ࠆ‫৻ޕ‬ᣇ㧘᦭ኂ㒶ߟ‫ߩߎޕ‬ጀ㑆㒶ࠗࠝࡦߪઁߩ㒶ࠗࠝࡦߣߩ੤឵߇น⢻ߢࠗࠝࡦߦ㑐ߒߡߪࠗࠝࡦ੤឵᮸⢽߿ࠠ࡟࡯࠻೷߇㐿⊒ߐ޽ࠅ㧘ߎߩ․ᕈࠍ೑↪ߒߚᳪᨴ᳓ਛߩ᦭ኂ㒶ࠗࠝࡦๆ⌕ࠇߡ޿ࠆ߇ߎࠇࠄߪ㕖Ᏹߦ㜞ଔߢ޽ࠆߚ߼㧘ߎࠇߦઍࠊ㒰෰߳ߩᔕ↪߇ᦼᓙߐࠇߡ޿ࠆ 5-11‫ޕ‬ߥߐࠇߡ޿ࠆ

Zn-Fe ♽ጀ⁁ⶄ᳓㉄ൻ‛(Zn-Fe LDH)ߪ㧘ᣂߒ޿࠲ࠗࡊࠆૐࠦࠬ࠻ߢ㜞ല₸ߥ᧚ᢱߣߒߡ㧘ጀ⁁ⶄ᳓㉄ൻ‛(LDHs)߇ᵈ⋡ߐࠇߡ޿ࠆ‫ޕ‬ߩ(㓁ࠗࠝࡦ⒳ߩ⚵ߺวࠊߖ߇ᣂߒ޿)LDHs ߢ޽ࠆ‫ޕ‬

LDHs ߪ 㒶 ࠗ ࠝ ࡦ ᕈ ☼ ࿯ ߩ ৻ ⒳ ߢ ޽ ࠅ 㧘

LDHs ߩ㒶ࠗࠝࡦㆬᛯᕈߪ㧘ߘࠇࠍ᭴ᚑߒߡ޿ࠆ㓁ࠗࠝ

[M2+1-xM3+x(OH)2]x+(An-)x/n࡮mH2O ߩ⚵ᚑᑼߢ⴫ࠊߐࠇࠆ

ࡦ⒳߿ጀ㑆㒶ࠗࠝࡦ⒳ߦᓇ㗀ߐࠇࠆߣ⠨߃ࠄࠇ㧘Zn-Feൻว‛ߢ޽ࠆ‫ߢߎߎޕ‬㧘M ߪ Mg 㧘Fe 㧘Co 㧘Cu 㧘
2+2+2+2+2+Ni 㧘Zn ߥߤߩ 2 ଔ㊄ዻࠗࠝࡦ㧘M ߪ Al 㧘Cr 㧘Ga 㧘2+2+3+3+3+Mn 㧘Fe ߥߤߩ 3 ଔ㊄ዻࠗࠝࡦߢ޽ࠆ‫ޕ‬A
3+3+n-3+

ߪ CO32-㧘

LDH ߪઁߩ LDHs ࠃࠅ߽ߔߋࠇߚ㒶ࠗࠝࡦๆ⌕⢻ࠍ᦭ߒߡ޿ࠆน⢻ᕈ߇޽ࠆ‫⎇ᧄޕ‬ⓥߢߪ㧘ጀ㑆ߦ⎫㉄ࠗࠝࡦ

SO42-㧘NO3-㧘F-㧘Cl-㧘PO43-ߥߤ n ଔߩ㒶ࠗࠝࡦߢ޽ࠆ‫ޕ‬(SO42-)ࠍᜬߟ Zn-Fe LDH ࠍวᚑߒ㧘ᓧࠄࠇߚ Zn-Fe LDH
ߩฦ⒳᦭ኂ㒶ࠗࠝࡦߦኻߔࠆๆ⌕⢻ࠍ᣿ࠄ߆ߦߔࠆߎߣ
ࠍ⋡⊛ߣߔࠆ‫ޕ‬*1: ᚑくᄢቇℂᎿቇㇱ‛⾰↢๮ℂᎿቇ⑼*2: ᣧⒷ↰ᄢቇᄢቇ㒮ℂᎿቇ⎇ⓥ⑼: ᣧⒷ↰ᄢቇℂᎿቇⴚ㒮*3㧙㧙㧞㧚ታ㛎ᣇᴺ ว ᚑᚲቯỚᐲߩ⎫㉄੝㋦ 7 ᳓๺‛ߣ⎫㉄㋕(II)7 ᳓๺‛ߩᷙว᳓ṁᶧࠍ⺞⵾ߒ㧘pH ߇ 7 ߦߥࠆࠃ߁ߦ᳓㉄ൻ࠽࠻࡝࠙
ࡓ᳓ṁᶧ(1.25M)ࠍṢਅߒߡචಽߦᠣᜈߒߚ‫ߦࠄߐޕ‬㧘ᓧࠄࠇߚ Ộᶧࠍ 38͠ߢ 24 ᤨ㑆ᾫᚑߒߚ‫↢ࠅࠃߦࠇߎޕ‬ᚑߒߚᴉᲚ‛ࠍ࿕ᶧಽ㔌ߒ㧘40͠ߢੇ῎ߒߚᓟฦ᷹ቯߦଏߒߚ‫ޕ‬㧚 㒶ࠗࠝࡦๆ⌕⹜㛎ฦ⒳㒶ࠗࠝࡦ(ࠢࡠࡓ㉄Ⴎ㧘ࡈ࠶⚛ࠗࠝࡦ㧘࠮࡟ࡦ㉄Ⴎ㧘ࡅ㉄Ⴎ㧘࡝ࡦ㉄Ⴎ)ߦኻߔࠆๆ⌕⹜㛎ࠍቶ᷷ਅߢⴕߞߚ‫ޕ‬(KI(GR :25URGEVTWOHQTU[PVJGUK\GFᓧࠄࠇߚ⹜ᢱߩๆ⌕⢻ߪ㧘ᦨ߽৻⥸⊛ߥ LDHs ߢ޽ࠆ<P(G.&*Mg-Al ♽὇㉄ဳ LDH(ࡂࠗ࠼ࡠ࠲࡞ࠨࠗ࠻)ߣᲧセߒߚ‫ޕ‬ᦨೋߦߘࠇߙࠇߩ㒶ࠗࠝࡦߩᏗ⭯᳓ṁᶧ(50 ppm)ࠍ⺞⵾ߒ㧘ߎߩ᳓ṁᶧ(100 mL)ਛߦฦ⹜ᢱࠍ 0.5 g ಽᢔߒߡ 60ಽ㑆ᠣᜈߒߚ‫ߩߘޕ‬ᓟ࿕ᶧಽ㔌ߒ㧘ࠈᶧਛߩฦ⒳㒶ࠗࠝࡦỚᐲࠍ᷹ቯߔࠆߎߣߦࠃߞߡๆ⌕㊂ࠍ᳿ቯߒߚ‫ޕ‬ಽ߆ߞߚ‫ޕ‬ᓧࠄࠇߚ⹜ᢱߩ Fe2p3/2XPS ࠬࡍࠢ࠻࡞ࠍ࿑ 2ߦ␜ߔ‫ޕ‬Fe2+(710.0 eV)ߣ Fe3+(712.5 eV)ߩਔᣇ߇ᬌ಴ߐࠇ㧘ߘߩ㕙ⓍᲧ(Fe2+ : Fe3+)ߪ 51.4 : 48.6 ߢ޽ߞߚ‫ࠡ࡞ࡀࠛޕ‬ߐࠄߦ㧘ᓧࠄࠇߚ⹜ᢱߩ࡝ࡦ㉄Ⴎ(900 ppm㧘100 mL)࡯ಽᢔဳ X ✢(EDX)ಽᨆߩ⚿ᨐ(Zn : Fe = 51.0 : 49.0)ࠍ⠨ߔࠆ pH ଐሽᕈࠍ⺞ߴߚ‫ޕ‬᳓ṁᶧߩ pH ⺞⵾ߪ᳓㉄ൻ࠽࠻ᚑᑼߪ[Zn2+0.51Fe2+0.25Fe3+0.24(OH)2]0.24+(SO42-)0.12࡮mH2O ߣ࡝࠙ࡓ᳓ṁᶧࠍ↪޿ߡⴕߞߚ‫㉄ࡦ࡝ޕ‬Ⴎߩๆ⌕㊂ߪ㧘਄᳿ቯߐࠇߚ‫ޕ‬⸥ߩታ㛎ߣห᭽ߦࠈᶧਛߩỚᐲࠍ᷹ቯߔࠆߎߣߦࠃߞߡ ฦ⒳㒶ࠗࠝࡦߦኻߔࠆๆ⌕⹜㛎⚿ᨐࠍ࿑ 3 ߦ␜ߔ‫ᧄޕ‬ๆ⌕ߩ⚻ᤨᄌൻ߿㧘࡝ࡦ㉄Ⴎ(500 ppm㧘100 mL)ๆ⌕ߦኻ᳿ቯߒߚ‫ޕ‬ᘦߦ౉ࠇࠆߣ㧘ᧄታ㛎ߦࠃࠅวᚑߐࠇߚ Zn-Fe LDH ߩ⚵⎇ⓥߢᓧࠄࠇߚ Zn-Fe LDH ߪ㧘࡝ࡦ㉄Ⴎ(߶߷ 100 %)㧘
ࠢࡠࡓ㉄Ⴎ(91.3 %)㧘࠮࡟ࡦ㉄Ⴎ(97.4 %)ߦኻߒߡ㜞޿ๆ㧟㧚⚿ᨐߣ⠨ኤ⌕⢻ࠍ␜ߒߚ‫ߚ߹ޕ‬㧘Zn-Fe LDH ߪ⚂ 70%ߩࡅ㉄Ⴎࠍๆ⌕ߒߚߩߦኻߒ㧘ࡂࠗ࠼ࡠ࠲࡞ࠨࠗ࠻ߪ߶ߣࠎߤๆ⌕⢻ ᓧࠄࠇߚ⹜ᢱߩ X ✢࿁᛬(XRD)ࡄ࠲࡯ࡦ(࿑㧝)ߦߪ㧘LDHs ߩ(00l)♽೉ߦ․ᓽ⊛ߥ࿁᛬✢߇⃻ࠇ㧘Zn-Fe LDHන⋧߇ᓧࠄࠇߚߎߣ߇⏕⹺ߐࠇߚ‫(ޕ‬003)࿁᛬✢ߪᐩ㕙㑆㓒ߦኻᔕߒ㧘Zn-Fe LDH ߩ d ୯ߪ 1.102 nm ߢ޽ࠆߎߣ߇ࠍ␜ߐߥ߆ߞߚ‫৻ޕ‬ᣇ㧘ࡈ࠶⚛ࠗࠝࡦߦኻߒߡߪ㧘ߤߜ
ࠄߩ LDH(Zn-Fe LDH㧘ࡂࠗ࠼ࡠ࠲࡞ࠨࠗ࠻)߽߶ߣࠎߤ

ๆ⌕⢻ࠍ␜ߐߥ߆ߞߚ‫ߪ⽎⃻ߩߎޕ‬㧘ߐ߹ߑ߹ߥ LDHsߦ㑐ߒߡႎ๔ߐࠇߡ޿ࠆ̌ଔᢙߩᄢ߈ߥ㒶ࠗࠝࡦߪ㧘ଔᢙߩዊߐߥ㒶ࠗࠝࡦࠃࠅ߽ጀ㑆߳ࠗࡦ࠲࡯ࠞ࡟࡯࡚ࠪࡦ
ߒᤃ޿̍ߣ޿߁௑ะ 13 ߣ৻⥌ߔࠆ‫ޕ‬ ࡝ࡦ㉄Ⴎߦኻߔࠆๆ⌕㒰෰₸ߩ⚻ᤨᄌൻᦛ✢(࿑ 4)ࠃ

ࠅ㧘Zn-Fe LDH ߣࡂࠗ࠼ࡠ࠲࡞ࠨࠗ࠻ߢߪ㧘ోߊ⇣ߥߞߚๆ⌕ᐔⴧᤨ㑆ߣๆ⌕ኈ㊂ࠍ␜ߔߎߣ߇ಽ߆ߞߚ‫ޕ‬Zn-FeLDH ߢߪᦨೋߩ 1 ಽ㑆ߢ⚂ 47 %ߩ࡝ࡦ㉄Ⴎࠍๆ⌕ߒ㧘ߘߩᓟ߽ᓢ‫ߦޘ‬ๆ⌕ࠍ⛯ߌ㧘60 ಽᓟߩ࡝ࡦ㉄Ⴎๆ⌕₸ߪ
70.9 %ߢ޽ߞߚ‫৻ޕ‬ᣇ㧘ࡂࠗ࠼ࡠ࠲࡞ࠨࠗ࠻ߢߪᦨೋߩ

1 ಽ㑆ߢๆ⌕ᐔⴧߦ㆐ߒߡ߅ࠅ㧘60 ಽᓟߩๆ⌕₸ߪ 8.1 %ߢ޽ߞߚ‫ޕ‬ LDHs ߪ᳓㉄ൻ‛ၮᧄጀ߇ᱜߦᏪ㔚ߒߡ޿ࠆߚ߼㧘㒶

ࠗࠝࡦ⒳ߪߘߩጀ㑆⴫㕙߿ᄖ⴫㕙ߣᒝߊ⋧੕૞↪ߔࠆ 14‫ޕ‬(KI:4&RCVVGTPQHU[PVJGUK\GF<P(G㧙㧙(KI#FUQTRVKQPTCVGUQHRJQURJCVGQP C<P(G.&*CPF D J[FTQVCNEKVGCUC
HWPEVKQPQHVKOG㉄Ⴎߣߩࠗࠝࡦ੤឵߇น⢻ߦߥߞߚ‫ޕ‬ ৻⥸⊛ߦ㧘᳓ṁᶧਛߢߩๆ⌕෻ᔕߦߪ㧘ߘߩ pH ୯߇ᄢ߈ߥᓇ㗀ࠍਈ߃ࠆ‫ࠍߣߎߩߎޕ‬⠨ᘦߒ㧘ᓧࠄࠇߚ Zn-Fe

LDH ࠍ↪޿ߡ᭽‫ ߥޘ‬pH ୯(2.3㨪12.0)ߦ߅ߌࠆ࡝ࡦ㉄Ⴎๆ⌕₸ࠍ⺞ߴߚ(࿑ 5)‫ޕ‬pH 2.3 ߩߣ߈ 78.0 %ߩ࡝ࡦ㉄Ⴎࠍๆ⌕ߒ㧘pH10.0 ߹ߢߪ pH ୯ߩ਄᣹ߣߣ߽ߦๆ⌕㊂ߪᓢ‫߇ࠆ޽ߪߢߦޘ‬ᷫዋ௑ะࠍ␜ߒߚ‫ޕ‬ߐࠄߦ pH ୯ࠍ 12.0߹ߢ਄᣹ߐߖࠆߣ㧘ๆ⌕㊂ߪ 46.0 %߹ߢᕆỗߦᷫዋߒߚ‫ޕ‬ߎࠇߪ㧘pH ୯ߦኻߔࠆ࡝ࡦ㉄Ⴎߩଔᢙᄌൻߣ㧘pH ୯߇Ⴧടߔࠆߎߣߦࠃࠆ OH-Ớᐲ਄᣹ߩⶄว⊛ലᨐߦࠃࠆ߽ߩߢ޽ࠆߣ⠨߃ࠄࠇࠆ‫㉄ࡦ࡝ޕ‬ႮߪਃႮၮ㉄ߢ޽ࠅ pH(KI#FUQTRVKQPTCVGUQHXCTKQWUJCTOHWNCPKQPU QP C  <P(G .&* CPF D
J[FTQVCNEKVG

୯ߦࠃߞߡ⁁ᘒ߇ H2PO4-㧘HPO42-㧘PO43-ߩࠃ߁ߦᄌൻߒ㧘pK ߩ୯ߪߘࠇߙࠇ pK1 = 2.15㧘pK2 = 7.20㧘pK3 = 12.33
ߢ޽ࠆ‫ࠅ߹ߟޕ‬㧘pH12 ߢߪ࡝ࡦ㉄Ⴎߪଔᢙ߇ᄢ߈ߥ(2ଔ߿ 3 ଔߩ)⁁ᘒߢሽ࿷ߒߡ߅ࠅ㧘ๆ⌕ߐࠇࠆಽሶᢙ߇ᷫߎߩ․ᕈߪ㧘Ԙᄖ⴫㕙߳ߩๆ⌕㧘ԙጀ㑆ࠗࠝࡦߣߩࠗࠝࡦ੤឵㧘ߣੑߟߩ㒶ࠗࠝࡦ㒰෰ᯏ᭴ࠍน⢻ߦߔࠆ 15, 16‫ޕ‬৻⥸⊛ߦ㧘⴫㕙ๆ⌕෻ᔕߪࠗࠝࡦ੤឵෻ᔕࠃࠅ߽ᣧ޿‫ޕ‬ߎࠇߪ㧘ࠗࠝࡦ੤឵෻ᔕ߇᜛ᢔࡊࡠ࠮ࠬߢ޽ࠆߩߦኻߒ㧘⴫㕙ๆ⌕෻ᔕߪᱜߦᏪ㔚ߒߚᄖ⴫㕙ߣ㒶ࠗࠝࡦߣߩ㑆ߦ௛ߊᒝ޿⋧੕૞↪(ࠢ࡯ࡠࡦജ)ߦࠃߞߡ߽ߚࠄߐࠇ㧘ߐࠄߦᄖ⴫㕙߇㜞ߊ㔺಴ߒߡ޿ࠆߎߣߦ⿠࿃ߔࠆ‫ޕ‬ એ਄ߩߎߣ߆ࠄ㧘ࡂࠗ࠼ࡠ࠲࡞ࠨࠗ࠻ߩ႐ว㧘࡝ࡦ㉄Ⴎߪጀ㑆ߦߪࠗࡦ࠲࡯ࠞ࡟࡯࠻ߐࠇߕߦ㧘ᄖ⴫㕙ߦߩߺๆ⌕ߐࠇߚߣ⠨߃ࠄࠇࠆ‫ޕ‬LDHs ߪ὇㉄ࠗࠝࡦߦ․⇣⊛ߥⷫ๺ᕈ߇޽ࠆ‫߼ߚߩߘޕ‬㧘ࡂࠗ࠼ࡠ࠲࡞ࠨࠗ࠻ጀ㑆ߩ὇㉄ࠗࠝࡦ߇࡝ࡦ㉄Ⴎߣߩࠗࠝࡦ੤឵ࠍ㒖ኂߒ㧘ࠗࠝࡦ੤឵෻ᔕ߇⿠ߎࠄߥ߆ߞߚߩߢߪߥ޿߆ߣ⠨߃ࠄࠇࠆ‫ޕ‬৻ᣇ㧘Zn-Fe LDH ߪ࡝ࡦ㉄Ⴎߦኻߒߡ㜞޿ๆ⌕⢻ࠍ␜ߒ(KI#FUQTRVKQPTCVGUQHRJQURJCVGQP<P(Gߚ‫ߪࠇߎޕ‬਄ㅀߒߚੑߟߩๆ⌕ࡔࠞ࠾࠭ࡓߩⶄวലᨐߦ.&*CUCHWPEVKQPQHR*ࠃࠆ߽ߩߢ޽ࠆߣ⠨߃ࠄࠇࠆ‫⎇ᧄޕ‬ⓥߦ߅޿ߡวᚑߒߚ
Zn-Fe LDH ߪጀ㑆ߦ⎫㉄ࠗࠝࡦࠍ᦭ߒߡ޿ࠆߚ߼㧘࡝ࡦ㧙㧙ዋߒߡߒ߹߁‫৻ޕ‬ᣇ㧘OH-ࠗࠝࡦߪ㧘Cl-㧘Br-㧘NO3-㧘I-ߥߤ 1 ଔߩࠗࠝࡦߩਛߢ LDHs ߦᦨ߽ࠗࡦ࠲࡯ࠞ࡟࡯ࠪ
࡚ࡦߐࠇᤃ޿ߎߣ߇ႎ๔ߐࠇߡ߅ࠅ 17㧘pH12 ߢߪ࡝ࡦ㉄Ⴎߣߣ߽ߦ OH-ࠗࠝࡦ߽┹੎⊛ߦࠗࡦ࠲࡯ࠞ࡟࡯࡚ࠪࡦߒߡ޿ࠆߣ⠨߃ࠄࠇࠆ‫ޕ‬એ਄ߩߎߣ߆ࠄ㧘Zn-Fe LDH ߪ᏷ᐢ޿ pH 㗔ၞ(2㨪10)ߦ߅޿ߡ㧘࡝ࡦ㉄Ⴎๆ⌕೷ߣߒߡ᦭↪ߢ޽ࠆߎߣ߇ಽ߆ߞߚ‫ߩߤࠎߣ߶ޕ‬ឃ᳓߇㉄ᕈ߆ࠄᒙࠕ࡞ࠞ࡝ᕈߩ▸࿐ߢ޽ࠆߎߣ߆ࠄ㧘ߎࠇߪታ↪ᕈࠍ⠨߃ߚ႐วߦᄢ߈ߥࡔ࡝࠶࠻ߣߥࠆ‫ޕ‬ ฦ pH ୯ߦ߅ߌࠆ࡝ࡦ㉄Ⴎๆ⌕⹜㛎ࠍⴕߞߚᓟߩ⹜ᢱߩ XRD ࡄ࠲࡯ࡦࠍ࿑ 6 ߦ␜ߔ‫ߪߦࡦ࡯࠲ࡄޕ‬௖߆ߥࡉࡠ࡯࠼ൻ߇⹺߼ࠄࠇࠆ߇㧘ߘࠇߙࠇߩ⹜ᢱߪ LDH ߩ᭴ㅧࠍ⛽ᜬߒߡ߅ࠅ㧘Zn-Fe LDH ߪ pH 2.3㨪12.0 ߢ቟ቯߢ޽ࠆߎߣ߇ಽ߆ߞߚ‫ ߩ࠻ࠗࠨ࡞࠲ࡠ࠼ࠗࡂޕ‬pH ߦኻߔࠆ቟ቯ㗔ၞߪ 4㨪12 ߢ޽ࠆߎߣ߆ࠄ㧘Zn-Fe LDH ߪߘࠇࠍ਄࿁ࠆ pH 㗔ၞߢ቟ቯߢ޽ࠆߎߣ߇␜ߐࠇߚ‫㉄ࡦ࡝ޕ‬Ⴎ߇ๆ⌕ߐࠇࠆߣ㧘8.02qߩ(003)࿁᛬✢ᒝᐲߪᷫዋߒ㧘㜞ⷺᐲ஥ߦᣂߚߥ࿁᛬✢߇⃻ࠇߚ‫ޕ‬࿁᛬✢ߩ㜞ⷺᐲ஥߳ߩࠪࡈ࠻ߪ㧘⚿᥏ᩰሶⓨ㑆ߩᷫዋࠍᗧ๧ߒߡ޿ࠆ‫ᧄޕ‬ታ
(KI 㩷 㪯㪩㪛㩷 㫇㪸㫋㫋㪼㫉㫅㫊㩷 㫆㪽㩷 㩿㪸㪀㩷 㫊㫋㪸㫉㫋㫀㫅㪾㩷 㫄㪸㫋㪼㫉㫀㪸㫃㩿㫅㫆㫅㪄㪸㪻㫊㫆㫉㪹㪼㪻㩷 㪱㫅㪄㪝㪼㩷 㪣㪛㪟㪀㩷 㪸㫅㪻㫇㪿㫆㫊㫇㪿㪸㫋㪼㪄㪸㪻㫊㫆㫉㪹㪼㪻㩷㪱㫅㪄㪝㪼㩷㪣㪛㪟㩷㪸㫋㩷㫇㪟㩷㫆㪽㩿㪹㪀㩷㪉㪅㪊㪃㩷㩿㪺㪀㩷㪋㪅㪇㩷㩿㪻㪀㩷㪎㪅㪈㪃㩷㩿㪼㪀㩷㪈㪇㪅㪇㪃㩷㩿㪽㪀㩷㪈㪉㪅㪇㪅㩷㛎ߦ߅޿ߡߪ㧘⎫㉄ࠗࠝࡦࠃࠅࠨࠗ࠭ߩዊߐߥ࡝ࡦ㉄Ⴎߣࠗࠝࡦ੤឵ߔࠆߎߣߦࠃࠅ㧘ᐩ㕙㑆㓒(003)߇ᷫዋߒߚ‫ޕ‬pH 12.0 ߢߪ 8.02qߩ(003)࿁᛬✢߇ᶖṌߒ㧘㜞ⷺᐲ஥(10.08q)ߩᣂߚߥࡇ࡯ࠢߩߺ߇⏕⹺ߐࠇߚ‫ߪࠇߎޕ‬㧘

Zn-Fe LDH ߇࡝ࡦ㉄Ⴎߛߌߢߪߥߊ OH-ࠗࠝࡦߣ߽ࠗࠝෳ⠨ᢥ₂ࡦ੤឵ߔࠆߎߣߦࠃࠅ㧘ጀ㑆ࠗࠝࡦߢ޽ࠆ⎫㉄ࠗࠝࡦ߇ߘࠇࠄߩࠗࠝࡦߦߔߴߡ⟎߈឵ࠊߞߚߚ߼ߢ޽ࠆߣ⠨߃

1.

ࠄࠇࠆ‫ޕ‬

㧠㧚⚿ ⺰ጀ㑆ߦ⎫㉄ࠗࠝࡦࠍᜬߟ Zn-Fe LDH ࠍ౒ᴉᴺߦࠃࠅ ว ᚑ ߔ ࠆ ߎ ߣ ߇ ߢ ߈ 㧘 ߘ ߩ ⚵ ᚑ ᑼ ߪ[Zn2+0.51Fe

2+3+0.24+(SO42-)0.12࡮mH2O ߣ᳿ቯߐ0.25Fe 0.24(OH)2]ࠇߚ‫ޕ‬ฦ⒳᦭ኂ㒶ࠗࠝࡦߦኻߔࠆๆ⌕⹜㛎ߦࠃࠅ㧘ᓧࠄ
ࠇߚ Zn-Fe LDH ߪࡂࠗ࠼ࡠ࠲࡞ࠨࠗ࠻ࠃࠅ߽㜞޿ๆ⌕⢻ࠍ᦭ߒߡ޿ࠆߎߣ߇⏕⹺ߐࠇߚ‫ߦ․ޕ‬㧘Zn-Fe LDH ߪ࡝ࡦ㉄Ⴎ㧘ࠢࡠࡓ㉄Ⴎ㧘࠮࡟ࡦ㉄Ⴎߦኻߒ㜞޿ๆ⌕⢻ࠍ᦭ߒߡ޿ࠆ‫ޕ‬Zn-Fe LDH ߩ࡝ࡦ㉄Ⴎๆ⌕㊂ߪ pH ୯ߦଐሽ
ߒ㧘pH ୯߇ૐ޿߶ߤๆ⌕㊂߇Ⴧᄢߔࠆߎߣ߇ಽ߆ߞߚ‫ޕ‬߹ߚ㧘Zn-Fe LDH ߪ᏷ᐢ޿ pH 㗔ၞ(2㨪12)ߦ߅޿ߡ቟ቯ
ߢ޽ࠅ㧘วᚑߩኈᤃߐ߿㜞޿㒶ࠗࠝࡦๆ⌕⢻ߥߤࠍ⠨ᘦߦ౉ࠇࠆߣ㧘ߎߩ Zn-Fe LDH ߪ᳓⾰ᵺൻ೷ߣߒߡ㕖Ᏹߦലᨐ⊛ߥ᧚ᢱߢ޽ࠆߣ޿߃ࠆ‫ޕ‬

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