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Abstract
2,4-dichlorophenol (2,4-DCP) is intermediate in the manufacture of pesticide and pharmaceutical
products that spread in downgradient and groundwater. In this study, the nano zero-valent iron (NZVI) was
synthesized by using the reduction reaction of FeCl3 and NaBH4 which precursor. The NZVI used as a catalyst for
degradation of 2,4-DCP (100 mg/l) aqueous solution. The Minitab program was used to design the experiment by
using two-level full factorial model (2k full factorial). There were three studied factors that were catalyst type
(Commercial-NZVI and Synthesis-NZVI), initial pH and catalyst dosage. The data from 2k factorial models were
optimized by Minitab program. The optimum condition for degradation was pH 7 and Synthesis-NZVI was 6 g/l.
The percent removal of 2,4-DCP was 26.77% at 3 h.
Keywords: Zero-valent iron nanoparticles, 2,4-dichlorophenol, Factorial design
‡ÎµœÎµ
µ¦°·œš¦¸¥r 2,4-ŗ‡¨°Ã¦¢eœ°¨ (2,4-DCP) čoÁž}œµ¦˜´ÊŠ˜oœÄœ„µ¦Ÿ¨· ˜µ¦„ε‹´—ª´¡ºÄœ°»˜µ®„¦¦¤
„µ¦Á„¬˜¦ ¨³„µ¦Ÿ¨·˜°ºÉœÇ Ĝ°»˜µ®„¦¦¤·ÉŠš° ¸¥o°¤ „¦³—µ¬ „µ¦Âž¦¦¼žÅ¤o °» ˜µ®„¦¦¤¥µŠ °»˜µ®„¦¦¤
œÊε¤´œžµ¨r¤ œÊε¥µ¨oµŠ¦¼ž µ¦¡· ¬œ¸Ê‹³Â¡¦n „¦³‹µ¥Á oµ¼n ·ÉŠÂª—¨o°¤‹µ„µÁ®˜» „µ¦Äo¥µ‰nµÂ¤¨ŠÂ¨³¥µž¦µ«´ ˜¦¼¡º 
®¦º°„µ¦ž¨n°¥ °ŠÁ¸ ¥‹µ„把µœ°»˜µ®„¦¦¤ Ž¹ÉŠ‹³n ŠŸ¨˜n°»£µ¡ °Š¤œ»¬¥r¨³´˜ªr œÊε ×¥Áž} œ°´œ˜¦µ¥˜n°
¦³šµŠÁ—·œ®µ¥Ä‹ ¤¸Ÿ¨˜n°¦³Å˜ ˜´ ¨³ °ª´¥ª³Äœ„µ¦Ÿ¨·˜Á¨º °——oª¥ œ°„‹µ„œ¸Ê¥´Š¡ªnµ 2,4-DCP ¤¸ ¡·¬˜n°
ÁŽ¨¨rÁœºÊ°Á¥ºÉ°¤œ»¬¥rš¸É °n°œÅ®ªÂ¨³˜°œ°Š˜n°µ¦Šnµ¥ (Ormad et.al. (2001))
œªšµŠ®œ¹ÉŠÄœ„µ¦Îµ´— 2,4-DCP š¸É„ε¨´ŠÅ—o¦´‡ªµ¤œÄ‹Äœž{‹‹»´œ ‡º°„µ¦Á¦nŠ„µ¦¨µ¥˜´ª °Š
µ¦ž¦³„°°·œš¦¸¥rš¸É¤¸‡¨°¦¸œÁž}œ°Š‡rž¦³„°Ä®o ®¤—£µ¡‡ªµ¤Áž}œ¡·¬—oª¥ NZVI Ž¹ÉŠÁž}œ˜´ª°°„Ž·Å—Žrš¸É—¸ š¸É
µ¤µ¦™Äoŗoš´ÊŠÄœ£µª³š¸É ¤¸ÂŠÂ¨³Å¤n¤¸ÂŠ Ž¹ÉŠ Cheng ¨³‡–³ (Cheng et.al. (2008)) ŗošÎ µ„µ¦«¹„¬µž’·„·¦·¥µ
„µ¦Å¨n‡¨°¦¸ œ°°„ °Šµ¦ž¦³„°‡¨°Ã¦¢eœ°¨—oª¥ NZVI ĜœÊεÁ¸ ¥ ¡ªnµµ¤µ¦™Îµ´—œÊεÁ¸¥Å—o —¸ —´Šœ´ÊœÄœ
„µ¦ª·‹´¥œ¸Ê‹¹ŠÁ¨º°„čo NZVI Ĝ„µ¦Á¦nŠ„µ¦¨µ¥˜´ª °Š 2,4-DCP š¸ÉžœÁžg°œÄœœÊε —oª¥ NZVI š¸É ´ŠÁ‡¦µ³®r¹Êœ
(Glavee et.al. (1995)) Áž¦¸¥Áš¸¥„´„µ¦Á¦nŠ„µ¦¨µ¥˜´ª—oª¥ NZVI šµŠ„µ¦‡oµ ×¥¤¸„µ¦°°„„µ¦š—¨°Š
(Design of Experiments ®¦º° DOE) Á oµ¤µÄoĜŠµœª· ‹´¥œ¸Ê—oª¥
DOE ¤¸‹»—ž¦³Š‡rš¸É‹³‡ª‡»¤„µ¦Áž¨¸É ¥œÂž¨Š˜´ªÂž¦°· ¦³ ®¦º° ž{‹‹´¥ (Factors) °Š„¦³ªœ„µ¦Ä—
„¦³ªœ„µ¦®œ¹ÉŠ ¨oª—¼Ÿ¨š¸É Á„·— ¹Êœ„´˜´ªÂž¦˜°œ°Š (Response) °Š„¦³ªœ„µ¦œ´Êœ Ž¹ÉŠ¤¸o°—¸‡º°šÎµÄ®o¨—
ž¦· ¤µ–„µ¦š—¨°ŠÂ¨³¨—¦³¥³Áª¨µÄœ„µ¦ž’·´ ˜·„µ¦ °Š„µ¦š—¨°Š °¸„š´ÊŠ¥´Šnª¥ž¦³®¥´—š¦´¡¥µ„¦·ÊœÁž¨º°Š
˜nµŠÇ š¸ÉčoŞĜ„µ¦š—¨°Š—oª¥ ץ—ŠÄœ¦¼ž‡ªµ¤´¤¡´œ›rÁ·Š™·˜·¦³®ªnµŠ˜´ªÂž¦°· ¦³„´˜´ªÂž¦˜µ¤ Ĝš¸Éœ¸Ê
šÎ µ„µ¦°°„„µ¦š—¨°Š—oª¥ª·›¸ „µ¦š—¨°ŠÂÂ¢‡š°Á¦¸¥¨Á˜È¤¦¼ž°´œ—´°Š (2 k Full factorial experiment) Ž¹ÉŠ
Áž}œÂš¸Éœ·¥¤°¥nµŠ„ªoµŠ ªµŠÄœ DOE š¸É«¹„¬µŸ¨„¦³š¦nª¤¦³®ªnµŠž{‹‹´¥˜´Ê ŠÂ˜n 2 ž{ ‹‹´¥ ¹ÊœÅž (k • 2) (ž¦³Å¡
«¦¸ »š´«œr – °¥»›¥µ (2551)) Á¡ºÉ °«¹„¬µÁŠºÉ°œÅ Ĝ„µ¦Á¦nŠ„µ¦¨µ¥˜´ª °Š 2,4-DCP —o ª¥ NZVI ĜœÊε˜´ª°¥nµŠ
宦´Šµœª·‹´¥œ¸Ê ×¥„µ¦°°„‹³šÎµÄœ¦¼ž °ŠÃž¦Â„¦¤Á·Š™· ˜· Ž¹É Š¤¸®¨µ¥Ãž¦Â„¦¤ Ĝš¸Éœ¸Ê ‹³šÎµ„µ¦