Nghiên cứu hấp phụ thuốc nhuộm methylen xanh bằng vật liệu bã cà phê nano fe3o4

ĈҤ,+Ӑ&Ĉ¬1Ҹ1* 75ѬӠ1*ĈҤ,+Ӑ&6Ѭ3+Ҥ0 +2$+Ï$ - 1*Ð9Ă17+Ð1* 1*+,Ç1&Ӭ8+Ҩ33+Ө7+8Ӕ&1 METHYLEN XANH %1*97/,8 %ư&ơ3+ầ1$12)H 3O4 +ẽ$/81771*+,3 &1+ặ1.+2$+& j1QJ - 1P , +Ӑ&Ĉ¬1Ҹ1* 75ѬӠ1*ĈҤ,+Ӑ&6Ѭ3+Ҥ0 +2$+Ï$ - 1*+,ầ1&8+33+7+8& 0(7+ 3@ 7URQJ QѭӟF WѭѫQJ WiF JLӳD PӝW FKҩW KѫQUҩWQKLӅXYuWURQJKӋFytWQKҩWO SKөYjFKҩWEӏKҩSSKө 'RVӵFyPһWFӫDGXQJP{LQrQWURQJ WUDQKJLӳDFKҩWEӏKҩSSKөYjGXQJP{L &һSQjRFyWѭѫQJWiFPҥQKWKuKҩSSK FһSWѭѫQJWiFSKөWKXӝFYjRFiF\ӃXWӕ ѭDKRһF NӏQѭӟFFӫDFKҩWKҩSSK ө PӭFÿӝ NӏQѭӟFFӫDFiF P{LWUѭӡQJQѭӟF 1.4Ĉ͡QJK͕FK̭SSKͭ > 3@ 7URQJ P{L WUѭӡQJ QѭӟF TXi WUuQK Kҩ FKҩWKҩSSKөYuYұ\TXiWUuQKÿӝQJKӑ NӃWLӃ p : 17 - &iFFKҩWEӏKҩSSKөFKX\ӇQÿӝQJWӟLEӅ - *LDLÿRҥQNKXӃFKWiQWURQJGXQJGӏFK - 3KkQWӱFKҩWEӏKҩSSKөFKX\ӇQÿӝQJÿӃ KӋPDRTXҧQ 1.4.&kQE ̹ ng h̭ p phͭ> 4@ 4Xi WUuQK ҩ p phө Oj mӝ K W TXiұ WUuQK n nghӏ FK WKX &iF ҫ n tӱchҩ SK t bӏhҩ p phөNKL ҩ pÿm phөWUrQ K Ӆmһ t chҩ E t hҩ p phөvү Q Fy Ӈdi chuyӇ WK Q QJѭ ӧc lҥ i pha mang Theo thӡLJLDQOѭ ӧng chҩ t bӏhҩ p phөWtFKW өWUrQE Ӆmһ t chҩ t rҳ QFjQJQKL Ӆ u WKuW ӕFÿ ӝdi chuyӇ QQJ c trl i pha PDQJ FjQJO Qỗ n mӝt thӡLÿL Ӈ PQjRÿy tӕFÿ ӝhҩ p phөbҵ ng tӕ Fÿ ӝgiҧ i hҩ SWKuTXiWUuQKK ҩ p phөÿ ҥ WFkQE ҵ ng Mӝt hӋhҩ p phөNKLÿ ҥ Wÿ Ӄ n trҥ QJWKiLFkQE ҵ QJOѭ ӧng chҩ t bӏhҩ p phөOjP ӝ t KjPF ӫa nhiӋ Wÿ ӝ iSVX ҩ t hoһ c nӗQJÿ ӝcӫ a chҩ t bӏhҩ p phө: q = f (T, P hoһ c C) ӢnhiӋ Wÿ ӝNK{QJÿ әL7 FRQVW ÿX ӡng biӇ u diӉ n sӵphөthuӝ c cӫDTYjR3KR һ cC (q = f(T) (P hoһ F& ÿX ӧc gӑLOjÿX ӡQJÿ ҷ ng nhiӋ t hҩ p phỗ QJ ng nhi t h p ph FyWK Ӈÿѭ ӧF[k\G ӵQJWUrQF ӣsӣ OêWKX\ Ӄ t, kinh nghiӋ m hoһ FEiQNLQ nghiӋ PW\WKX ӝ FYjRWL Ӆ Qÿ Ӆ , giҧthiӃ t, bҧ n chҩ WYjNLQKQJKL Ӌ m xӱOtV ӕliӋ u thӵc nghiӋ m 1.43K˱˯QJWUuQK/DQJPXLU > 8@ Langmuir ÿm ÿѭD Oê WKX\ӃW YӅ Vӵ KҩS SKө Oê KӑF ÿѫQ SKkQ Wӱ GӵD WUrQ FiF JLҧ WKLӃW sau: - 6ӵ KҩS SKө OӵF KyD WUӏ Jk\ - 6ӵ KҩS SKө [ҧ\ WUrQ FiF KRi WUӏ Wӵ FӫD FiF QJX\rQ Wӱ hay SKkQ Wӱ WUrQ EӅ PһW YұW KҩS SKө - 9u EiQ NtQK WiF GөQJ FӫD OӵF KRi WUӏ Ep QrQ PӛL KyD WUӏ Wӵ FKӍ KҩS SKө PӝW SKkQ Wӱ QJKƭD Oj WUrQ EӅ PһW YұW KҩS SKө FKӍ KuQK WKjQK PӝW OӟS hҩS SKө ÿѫQ SKkQ Wӱ 1ăQJOѭӧQJKҩSSKөWUrQFiFWLӇXSKkQO - 3KkQ Wӱ Eӏ KҩS SKө FKӍ Eӏ JLӳ WUrQ EӅ PһW YұW KҩS SKө PӝW WKӡL gian QKҩW ÿӏQK sau ÿy WKăQJ JLiQJ YӅ QăQJ OѭӧQJ Qy Eӏ ÿӭW ĈyOj Vӵ JLҧL KҩS SKө Khi WӕF ÿӝ JLҧL KҩS SKө EҵQJ tӕF ÿӝ KҩS SKө ÿy KӋ WKLӃW OұS PӝW FkQ EҵQJ KҩS SKө 18 - /ӵF WѭѫQJ WiF JLӳD FiF SKkQ Wӱ FKҩW Eӏ KҩS SKө WUrQ EӅ PһW YұW KҩS SKө ÿѭӧF Eӓ qua ™ 3KѭѫQJWUuQKK ҩ p phөÿҷ ng nhiӋ W/DQJPXLUFyG ҥ ng (1.1): q = qmax b.Cs (1.1) b.Cs 7URQJÿy : TGXQJOѭӧQJKҩSSKөWҥLWKӡLÿ qmaxGXQJOѭӧQJKҩSSKөFӵFÿҥL bKҵQJVӕ/DQJPXLUKҵQJVӕFkQ KҩSSKө ) Khi b.CsWKuT T max.b.Cf P{WҧYQJKҩSSKөWX\ӃQ Khi b.Cf!!WKuT T max P{WҧYQJKҩSSKөEmRKzD ™ 'XQJOѭ ӧng hҩ p phөÿѭ ӧFWtQKWKHRF{QJWK ӭc (1.2): ‫ݍ‬ൌ ሺ େ౟ିେ౏ሻ Ǥ ୚ ୫ (1.2) q- GXQJOѭӧQJKҩSSKөPJJ Ci- QӗQJÿӝGXQJGӏFKÿҫXPJO Cs- QӗQJÿӝGXQJGӏFKNKLÿҥWFkQE V- WKӇWtFKGXQJGӏFKO m- NKӕLOѭӧQJFKҩWKҩSSKөJ .KLQӗQJÿӝFKҩWKҩS SKөQҵP JLӳDK ELӇXGLӉQOjPӝWÿRҥQFRQJĈѭӡQJKҩSS yGҥQJQKѭ 1.7 q (mg/l) qmax O Cf +uQK Ĉѭ ӡng hҩ p phөÿҷ ng nhiӋ t Langmuir 19 ĈӇ [iF ÿӏQK FiF KҵQJ WUuQK Vӕ ÿҷQJ WURQJ ө QKLӋW /DQJPXLU SKѭѫQ Kҩ ÿѭDSKѭѫQJWUuQK YӅSKѭѫQJWUuQKÿѭӡQJWKҷQJ (1.3): Cs q q max Cs  (1.3) q max b Cs/ q Į N O Cs +uQK Sӵphөthuӝc cӫD&VTYjR&V 1.4.6 3K˱˯QJWUuQKK ̭SSKͭÿ̻QJQKL͏W)UHXQGOLFK > 8@ Freundlich ÿm QJKLrQ FӭXҧ nh KѭӣQJ FӫD QӗQJ ÿӝ iSVXҩW FӫDFKҩW NKt  ÿӃQ ÿҥL OѭӧQJ SKө KҩS ӣQKLӋW ÿӝ NK{QJ ÿәL QKұQ WKҩ\ UҵQJ FiF ÿѭӡQJ KҩS SKө ÿҷQJ QKLӋW Fy GҥQJ JҫQ JLӕQJ YӟL QKiQK FӫD ÿѭӡQJ parabol QrQ {QJ ÿm ÿӅ QJKӏ F{QJ WKӭF WKӵF QJKLӋP sau: 9ӟL FKҩW NKt q = x/m = k.P1/n (1.4) 9ӟL FKҩW tan dung GӏFK q = x/m = k.C1/n (1.5) Trong ÿy x: Oj Vӕ mol FKҩW Eӏ KҩS SKө m: Oj NKӕL OѭӧQJ YұW KҩS SKө (gam) P : Oj iS VXҩW FkQ EҵQJ FӫD NKt C : Oj QӗQJ ÿӝ FkQ EҵQJ FӫD FKҩW tan quanh YұW KҩS SKө NOjKҵQJVӕKҩSSKө)UHXQGOLFK n: Oj KҵQJ Vӕ ÿһF WUѭQJ cho NKҧ QăQJ KҩS SKө FӫD WӯQJ FKҩW 7ҥL YQJ Fy P hay C WKҩS WKu q Wӹ OӋ EұF WKҩS YӟL P, C 7ҥL YQJ Fy P hay C cao WKu q = qmax NK{QJ SKө WKXӝF YjR P, C QӳD Yu TXi WUuQK KҩS SKө ÿm ÿҥW EmR KRj 20 log q q (mg/l) O C log C +u nh 1.9 Ĉѭ ӡng cong hҩ p phөÿ ҷ ng nhiӋ t Freundlich &y WKӇ WuP FiF KҵQJ Vӕ SKѭѫQJ WUuQK Frendlich Wӯ ÿӗ WKӏ EҵQJ FiFK Oҩ\ lg YӃ ÿӇ FKX\ӇQ YӅ GҥQJ ÿѭӡQJ WKҷQJ lgq = lgk + (1/n)lg Cs (1.6) 1.4.7 M͡t s͙y͇ u t͙̫QKK˱ ͧQJÿ ͇ QTXiWUuQKK ̭p phͭ> 4@ 4XiWUuQKK ҩ p phөchӏ uҧ QKKѭ ӣng cӫa mӝt sӕyӃ u tӕQKѭ% ҧ n chҩ t cӫa chҩ t bӏhҩ p phө , vұ t liӋ u hҩ p phө , pH, nhiӋ Wÿ ӝ iSVX ҩ t, thӡi gian hҩ p phөYj sӵFyP һ t cӫ DFiFFK ҩ WNKiF a Nhi͏ Wÿ ͡ 7URQJTXiWUuQKK p phQQJO ng tdo bm t hgi Pă*  ӗ ng thӡLÿ ӝhӛQÿ ӝ n cӫ a hӋgiҧ PGRFiFWL Ӈ XSKkQF ӫ a chҩ t bӏhҩ p phөOrQWUrQE Ӆmһ t chҩ t hҩ p phөÿѭ ӧc sҳ p xӃ p m WFiFKFyWU t tă6  ... CO, SO2, CO2, H2S Methylen xanh QJX QFKҩW GҥQJEӝWKRһFWLQKWKӇ Methylen xanh FyWKӇEӏR[KyDKRһF FӫD methylen xanh EӏR[KyDYjEӏNKӱNKRҧQJ ҫQJLk Methylen xanh OjPӝW KyDFKҩWÿѭӧF... +ҥWWӯWtQKORҥLEӓFiFWKXӕFQKXӝP KӳXFѫ YjFiFLRQNLPORҥL 1.3 Giӟi thiӋ u v? ?methylen xanh 1.3.1 Methylen xanh > 16@ Methylen xanh OjPӝWKӧSFKҩWWKѫPGӏYzQJ QăPF{QJWKӭFKyDKӑFOj C16H18ClNS... sӕӭng dө ng cӫDEmFjSKr 10 1.2 Giӟi thiӋ u v? ?nano sҳ t t? ?Fe3O4 11 1.3 Giӟi thiӋ u v? ?methylen xanh 13 1.3.1 Methylen xanh 13 1.3.2 7iFK ҥ i cӫ D{QKL Ӊ PQѭ