摘要
分别用层状氢氧化镁铝(LDHs)和焙烧层状氢氧化镁铝(CLDH)作为吸附剂,吸附脱除水溶液中染料酸性橙Ⅱ,考察了Mg/Al物质的量之比、吸附剂的投加量、脱色时间、初始pH值等因素对脱色率的影响.结果表明,以Mg/Al物质的量之比为3制得的层状氢氧化镁铝对酸性橙Ⅱ溶液的脱色效果最好;室温下,3.0 g·L-1LDHs和1.0 g·L-1的CLDH对浓度为70 mg·L-1的染料的脱色率分别达96.97%和99.88%;焙烧态的层状氢氧化镁铝在脱色时用量更少、脱色反应更迅速、适用的pH范围更广、脱色性能更好;饱和吸附后的LDHs用高温热解法再生,吸附性能良好,随再生次数增多,脱色率下降.
Decoloration effect of Acid Orange Ⅱ dye using Mg/Al layered double hydroxides（LDHs） and calcined Mg/Al layered double hydroxides（CLDH） was investigated.The effects of adsorption time,sorbent dosage,initial pH value were studied.The results showed that the decolorization effect is the best when molar ratio of Mg2＋ to A13＋ is 3 ∶ 1.Both LDHs and CLDH had excellent performance in decoloration and the efficiency of decoloration reached 96.97% and 99.88% with 3.0 g · L-1 LDHs and 1.0 g · L-1 CLDH respectively.The calcined Mg/A1 layered double hydroxides possesses more advantages,such as less dosage,shorter reaction time,pH wider range and higher decoloration rate.Thermal regeneration for re-use of LDHs after Acid Orange Ⅱ adsorption was feasible and the adsorption capacity of the regenerated material decreased with cycle number.
出处
《环境化学》
CAS
CSCD
北大核心
2011年第5期1019-1024,共6页
Environmental Chemistry
关键词
层状氢氧化镁铝
酸性橙Ⅱ
脱色
吸附
焙烧
Mg/Al layered double hydroxides
Acid OrangeⅡ
adsorption
decolourization
calcination.
