1 2 1 2 3 1 2 1. 100054 2. 100054 3. 100036 ph ph ph Langmuir 166. 67 mg /g Al 2 O 3 ph 7. 0 ~ 9. 0 ph HCO - 4 5. 00 mg /L 5 ph doi 10. 13928 /j. cnki. wrahe. 2017. 03. 017 TV213. 4 + TU991. 26 + 6 A 1000-0860 2017 03-0093-06 Study on preparation of amorphous aluminum hydroxide adsorbent and its fluoride removal performance LI Lianxiang 1 2 LIU Wenchao 1 2 SUN Ruigang 3 LI Tieguang 1 2 1. China Irrigation and Drainage Development Center Beijing 100054 China 2. Rural Drinking Water Safety Center of the Ministry of Water Resources Beijing 100054 China 3. The Office of the SNWDP Construction Commission in Beijing City Beijing 100036 China Abstract The defluoridation measure has an important significance for the safety of the resident drinking water. The technique of fluoride removal with adsorption method is widely used but it has the difficulty to be adaptable to the partial acid environment. By taking enhancing the adaptability of the ph value of high-fluorine groundwater as the objective the amorphous aluminum hydroxide adsorption materials are prepared through controlling the ph value during the reaction process the adsorption isotherm adsorption kinetics ph adaptability competing ion reusable performance and adsorption mechanism of amorphous aluminum hydroxide adsorbent are tested. The result shows that the adsorption of fluoride ion from the amorphous aluminum hydroxide belongs to the favorable adsorption and the maximum adsorption capacity of Langmuir is 166. 67 mg /g. Compared with the conventional adsorption materials of Al 2 O 3 the amorphous aluminum hydroxide adsorption materials can slow down the lowering rate of the fluoride removal effect and then the adaptability of ph value can be enhanced. The fluoride removal rate is decreased along with the increases of the ion concentrations of HCO - 3 CO 2-3 PO 3-4 etc. in the solution. When the initial fluoride concentration 2016-11-23 2015ZX07402003 1986 E - mail Lianxiang. 0810@ 163. com W ater Resources and Hydropower Engineering V ol. 48 No. 3 93
is 5. 00 mg /L the amorphous aluminum hydroxide adsorbent can be reused for five cycles. Therefore the improvement of the preparing process of the aluminum adsorption material can significantly enhance the adsorption performance and the adaptability of high-fluorine groundwater which is an important tendency for the development and improvement of the adsorption materials concerned. Keywords amorphous aluminum hydroxide ph value fluoride concentration adsorption fluoride removal rate high-fluorine groundwater drinking water safety 0 H1650 - W FA1004 1-2 SHA - C JEOL - 2010 1. 3 Al 2 SO 4 3 18H 2 O NaOH 55g Al 2 SO 4 3 18H 2 O 100 ml 3 - ph 5 100. 00 g /L NaOH 300 ml 180 rpm NaOH ph Al 2 SO 4 3 18H 2 O 6-7 ph ph 5. 0 ± 0. 2 ph 180 rpm 12 h 12 h Al 2 SO 4 3 18H 2 O NaOH ph ph ph 6. 3 ± 0. 2 60 1 1. 1 NaF NaCl NaH 2 PO 4 NaNO 3 Al 2 SO 4 3 18H 2 O NaH- CO 3 Na 2 CO 3 Na 2 SO 4 NaOH HCl 36% C 2 H 5 OH S22-2 DHG - 9036A 6 h 1 mg SEM 1. 4 1. 4. 1 5. 00 10. 00 20. 00 40. 00 60. 00 100. 00 mg /L HCl NaOH ph 7. 0 ± 0. 1 1. 00 g /L 25 150 r /min 24 h Q 8 e 1. 2 Q e = W e W = V C s - C e 1 W HI 98107 DR890 Q e mg /g W e 7500 mg W g V 90-1 L C s mg /L C e mg /L 94
Langmuir 150 rpm 24 h 8 Freundlich C e = C e + 1 2 Q e Q m Q m K L lnq e = 1 n lnc e + lnk 3 K L Langmuir L /mg C e 1. 4. 6 mg /L Q e mg /g Q m 1. 50 2. 00 mg /g k Freundlich n 2. 50 3. 50 4. 50 mg /L ph 7. 0 ± 0. 1 1. 00 g /L 25 150 rpm 1. 4. 2 24 h ph 5. 00 mg /L 1. 00 g 1. 5 GB /T 5750 2006 9 HI98107 t = 1 + 1 t 4 Q t k 2 Q 2 Q e e mg /g Q t t Q e mg /g k 2 min - 1 F - g / mg 2 1. 4. 3 ph 2. 1 ph SEM 5. 00 10. 00 50. 00 mg /L HCl NaOH ph 3. 0 ± 0. 1 4. 0 ± 0. 1 5. 0 ± 0. 1 6. 0 ± 0. 1 7. 0 ± 0. 1 8. 0 ± 0. 1 9. 0 ± 0. 1 10. 0 ± 0. 1 11. 0 ± 0. 1 1. 00 g /L 25 150 rpm 24 h 2. 2 = C s - C e 100% 5 C s C s mg /L C e mg /L 1. 4. 4 10 mg /L Cl - NO - 3 4 HCO - 3 PO 3-4 0. 0 0. 1 1. 0 10. 0 mmol /L NaCl NaNO 3 Na 2 SO 4 NaHCO 3 Na 2 CO 3 NaH 2 PO 4 1. 00 g /L 25 150 rpm 24 h 1 1 1. 4. 5 5. 00 mg /L 12. 00 mg /L ph 7. 0 ± 0. 1 1. 00 g /L 25 1% NaOH 6 h 5 ~ 6 ph Palintest 7500 Langmuir Freundlich Langmuir 4 DR890 1 ~ 2 μm 1 1 Freundlich K L /L mg - 1 Q m /mg g - 1 R 2 n k R 2 0. 03 166. 67 0. 994 1. 196 5. 099 0. 994 95
1 1 ph 3 Langmuir Freundlich 0. 994 ph 7. 0 ± 0. 1 Langmuir 166. 67 mg /g Freundlich n 1. 0 10-11 1 n 2. 3 2 3 ph 2 Al 2 O 3 ph 2 ph Al 2 O 3 3. 46 mg /g 60 min 3 a ph 6. 0 ph 5. 00 mg /L 12. 75 mg /L ph 5. 0 ~ 8. 0 10% 50. 00 mg /L ph ph 8. 0 3 b 3 b 5. 00 mg /L Al 2 O 3 0. 999 ph 6. 0 ph 2. 4 ph ph ph 96
Al 2 O 3 ph 7. 0 ~ 9. 0 Al 2 O 3 ph 7. 0 ~ 9. 0 ph 2. 5 Cl - NO - 3 4 HCO - 3 CO 2-3 PO 3-4 4 5 59. 5% 5 20% 5 12 2. 7 1. 40 2. 00 2. 67 3. 73 4. 32 mg /L 6 4 4 Cl - NO - 3 4 Cl - 10. 0 mmol /L HCO - CO 2-4 HCO - 4 3 CO 2-4 10. 0 mmol /L F - 40% 2. 6 5 5 5. 00 mg /L 5 79% 2 68. 4% 5 30% 12. 00 mg /L 6 5. 00 mg /L 6 a 1. 40 ~ 4. 32 5 mg /L 74. 4% 2 97
20. 00 ~ 50. 00 mg /L ph 4 2. 00 mg /L ph 4 50. 00 mg /L 4 25. 00 mg /L F - Al 2 SO 4 3 F - of fluoride ions adsorption on CeO 2 /Al 2 O 3 with non-thermal plasma J Al OH Al F Al SO 4 168 2 665-671. Al 2F 4 4 20. 00 ~ 50. 00 3 mg /L ph 6 b 4 ph 2011. 5 ph D ph 6. 0 ph Al OH Al F 4 Al SO 4 Al 2F 4 Al OH Al F GONG 6 3 ph double hydroxides J 3 100-108. Langmuir 12 166. 67 mg /g Al 2 O 3 ph 7. 0 ~ 9. 0 ph HCO - 4 5. 00 mg /L 5 Al OH Al F Al SO 4 Al 2F 4 1 ZHANG T LI Q LIU Y et al. Equilibrium and kinetics studies composites pretreated. Chemical engineering journal 2011 2 WANG J XU W CHEN L et al. Excellent fluoride removal performance by CeO 2 -ZrO 2 nanocages in water environment J. Chemical engineering journal 2013 231 17 198-205.. J. 1989 8 1 46-49.. D... 2015. 6 GONG W X QU J H LIU R P et al. Adsorption of fluoride onto different types of aluminas J. Chemical engineering journal 2012 189-190 126-133. 7 DU X WANG Y SU X et al. Influences of ph value on the microstructure and phase transformation of aluminum hydroxide J. Powder technology 2009 192 1 40-46. 8. M. 2006. 9. GB /T 5750 2006 S. 2006. 10. D. 2013. 11 CAI P ZHENG H WANG C et al. Competitive adsorption characteristics of fluoride and phosphate on calcined Mg-Al-CO 3 layered. Journal of hazardous materials 2012 213. C / /.. 2010. 98