In the presence of Triton X100,the color reaction of Mercury(Ⅱ)with 2hydroxy5nitrophenyldiazoaminoazobenene(HNPDAAB)was studied.Mercury(Ⅱ)reacts with HNPDAAB and forms a 1∶1 red complex at pH=95-110 buffer solution...In the presence of Triton X100,the color reaction of Mercury(Ⅱ)with 2hydroxy5nitrophenyldiazoaminoazobenene(HNPDAAB)was studied.Mercury(Ⅱ)reacts with HNPDAAB and forms a 1∶1 red complex at pH=95-110 buffer solution of Na2B4O7NaOH.The molar absorptivity is 256×105L·mol-1·cm-1.Beer’s law is obeyed in the concentration range of 0～12μg/25mL for Mercury(Ⅱ).The results are in agreement with those determined by the conventional method.This new method was used to determine trace mercury in wastewater.展开更多
Cr(Ⅵ) was quantitatively adsorbed by D201×4 resin with pH=2.63～3.66 in the medium of HAc NaAc.The statically saturated sorption capacity is 156.8mg/g·resin.The sorption rate constant is k 298 =1.80×10...Cr(Ⅵ) was quantitatively adsorbed by D201×4 resin with pH=2.63～3.66 in the medium of HAc NaAc.The statically saturated sorption capacity is 156.8mg/g·resin.The sorption rate constant is k 298 =1.80×10 -4 s -1 .The apparent sorption activation energy of APAR for Cr(Ⅵ) is 7.21kJ·mol -1 .The themodynamic parameters of sorption:enthalpy change ΔH,free energy change ΔG and entropy change ΔS of sorption (D201×4) for Cr(Ⅵ) are 33.12kJ·mol -1 ,-28.36kJ·mol -1 ,206.3J·mol -1 ·K -1 ,respectively.Coordination molar ratio of the functional group of D201×4 to Cr(Ⅵ) is 1∶1.Cr(Ⅵ) adsorbed on D201×4 can be reductively eluated by 5% NH 4Cl-10% NH 3·H 2O.The sorption rate of D201×4 for Cr(Ⅵ) is fast.The equilibrium time of adsorption is five hours.展开更多
The adsorption behavior and mechanism of a novel thiol resin for Ag(Ⅰ) were investigated Experimental results showed that the statically saturated sorption capacity was 639 mg·g -1 resin at pH=4 5 in the HNO 3 N...The adsorption behavior and mechanism of a novel thiol resin for Ag(Ⅰ) were investigated Experimental results showed that the statically saturated sorption capacity was 639 mg·g -1 resin at pH=4 5 in the HNO 3 NaAc medium Ag(Ⅰ) adsorbed on the thiol resin could be eluted with (5%～10%) (NH 2) 2CS-1 0mol·L -1 HCl and elution percentage was over 95% The resin could be regenerated and reused without apparent decrease of adsorption capacity The adsorption behavior obeyed the Freundlich isotherm The apparent adsorption rate constant was k 25℃ =1 56×10 -5 s -1 The enthalpy change Δ H of sorption was 40 2 kJ·mol -1 The functional group molar ratio to Ag(Ⅰ) was about 1∶1 and the mechanism of adsorption was examined by IR展开更多
In this paper the sorption behavior of Yb(Ⅲ) onto the macroporous phosphonic acid resin (MPAR) is reported.Experimental results show that the statically saturated sorption capacity is 328 mg/g·resin;Yb(Ⅲ) adsor...In this paper the sorption behavior of Yb(Ⅲ) onto the macroporous phosphonic acid resin (MPAR) is reported.Experimental results show that the statically saturated sorption capacity is 328 mg/g·resin;Yb(Ⅲ) adsorbed on MPAR can be eluted by 1mol·L -1 HCl,elution percentage is 91.5%.The apparent rate constant is k 298 = 4.63×10 -5 s -1 .The sorption behavior of MPAR for Yb(Ⅲ) abides the Freundlich isotherm.The themodynamic parameter of sorption:enthalpy change ΔH for Yb(Ⅲ) is 50.4kJ·mol -1 .The coordination molar ratio of the functional group of MPAR to Yb(Ⅲ) is 3∶1.The bondforming conditions of MPAR for Yb(Ⅲ) is examined by IR spectrometry.展开更多
The color reaction of 1(2,6dichloro4nitrophenyl)3(4nitrophenyl)Triazene(DCNPNPT)with cethyltrimethylammonium bromide(CTMAB) and cetylpyridinium bromide(CPB)were studied.In NaOH medium,DCNPNPT reacts with quartenary am...The color reaction of 1(2,6dichloro4nitrophenyl)3(4nitrophenyl)Triazene(DCNPNPT)with cethyltrimethylammonium bromide(CTMAB) and cetylpyridinium bromide(CPB)were studied.In NaOH medium,DCNPNPT reacts with quartenary ammonium cationic surfactant(CTMAB,CPB)to form a purplered complex with the molar ratio of 1∶3.The molar absorptivities of CTMAB and CPB are 393×104L·mol1·cm1 and 416×104L·mol1·cm1 by using dualwavelength spectrophotometry.Beers law is obeyed in the range of 0～328×105mol·L1 for CTMAB,0～316×105 mol·L1 for CPB.The critical micella concentration of CTMAB and CPB in the color system was determined.The method was applied to the direct determination of cationic surfactant in water with satisfactory results.展开更多
The adsorption behavior and mechanism of a novel chelate resin, iminodiacetic acid resin (IDAAR) for Y? were investigated. The statically saturated adsorption capacity is 102mg· g- 1 resin at 298K in HAc NaAc med...The adsorption behavior and mechanism of a novel chelate resin, iminodiacetic acid resin (IDAAR) for Y? were investigated. The statically saturated adsorption capacity is 102mg· g- 1 resin at 298K in HAc NaAc medium at pH 5.7. Y? adsorbed on IDAAR can be reductively eluted by 1.0～ 4.0mol· L- 1 HCl used as eluant and the elution percentages are almost as high as 100% . The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k298=3.36× 10- 5s- 1. The adsorption behavior of IDAAR for Y? conforms to Freundlich′ s model reasonably. The thermodynamic adsorption parameter, enthalpy change Δ H of IDAAR for Y? is 18.6kJ· mol- 1. The complex molar ratio of the functional group of IDAAR to Y? is about 3∶ 1. The adsorption mechanism of IDAAR for Y? was examined by using chemical method and IR spectrometry.展开更多
The adsorption behavior and mechanism of amino methylene phosphonic acid resin (APAR) for praseodymium(Ⅲ) is investigated.The apparent rate constant is k 298 =2.89×10 -5 sec -1 .The adsorption behavior of APAR f...The adsorption behavior and mechanism of amino methylene phosphonic acid resin (APAR) for praseodymium(Ⅲ) is investigated.The apparent rate constant is k 298 =2.89×10 -5 sec -1 .The adsorption behavior of APAR for Pr(Ⅲ) abides the Freundlich isotherm.The adsorption thermodynamic parameters such as enthalpy change ΔH°,free energy change ΔG° and entropy change ΔS° of adsorption (APAR) for Pr(Ⅲ) are 6.38kJ·mol -1 ,-5.27kJ·mol -1 ,39.1J·mol -1 ·K -1 ,respectively.Activation energy Ea=8.39kJ·mol -1 .The coordination molar ratio of the functional group of APAR to Pr(Ⅲ) was confirmed by chemical analysis and IR spectrometry.展开更多
文摘In the presence of Triton X100,the color reaction of Mercury(Ⅱ)with 2hydroxy5nitrophenyldiazoaminoazobenene(HNPDAAB)was studied.Mercury(Ⅱ)reacts with HNPDAAB and forms a 1∶1 red complex at pH=95-110 buffer solution of Na2B4O7NaOH.The molar absorptivity is 256×105L·mol-1·cm-1.Beer’s law is obeyed in the concentration range of 0～12μg/25mL for Mercury(Ⅱ).The results are in agreement with those determined by the conventional method.This new method was used to determine trace mercury in wastewater.
文摘Cr(Ⅵ) was quantitatively adsorbed by D201×4 resin with pH=2.63～3.66 in the medium of HAc NaAc.The statically saturated sorption capacity is 156.8mg/g·resin.The sorption rate constant is k 298 =1.80×10 -4 s -1 .The apparent sorption activation energy of APAR for Cr(Ⅵ) is 7.21kJ·mol -1 .The themodynamic parameters of sorption:enthalpy change ΔH,free energy change ΔG and entropy change ΔS of sorption (D201×4) for Cr(Ⅵ) are 33.12kJ·mol -1 ,-28.36kJ·mol -1 ,206.3J·mol -1 ·K -1 ,respectively.Coordination molar ratio of the functional group of D201×4 to Cr(Ⅵ) is 1∶1.Cr(Ⅵ) adsorbed on D201×4 can be reductively eluated by 5% NH 4Cl-10% NH 3·H 2O.The sorption rate of D201×4 for Cr(Ⅵ) is fast.The equilibrium time of adsorption is five hours.
文摘The adsorption behavior and mechanism of a novel thiol resin for Ag(Ⅰ) were investigated Experimental results showed that the statically saturated sorption capacity was 639 mg·g -1 resin at pH=4 5 in the HNO 3 NaAc medium Ag(Ⅰ) adsorbed on the thiol resin could be eluted with (5%～10%) (NH 2) 2CS-1 0mol·L -1 HCl and elution percentage was over 95% The resin could be regenerated and reused without apparent decrease of adsorption capacity The adsorption behavior obeyed the Freundlich isotherm The apparent adsorption rate constant was k 25℃ =1 56×10 -5 s -1 The enthalpy change Δ H of sorption was 40 2 kJ·mol -1 The functional group molar ratio to Ag(Ⅰ) was about 1∶1 and the mechanism of adsorption was examined by IR
文摘In this paper the sorption behavior of Yb(Ⅲ) onto the macroporous phosphonic acid resin (MPAR) is reported.Experimental results show that the statically saturated sorption capacity is 328 mg/g·resin;Yb(Ⅲ) adsorbed on MPAR can be eluted by 1mol·L -1 HCl,elution percentage is 91.5%.The apparent rate constant is k 298 = 4.63×10 -5 s -1 .The sorption behavior of MPAR for Yb(Ⅲ) abides the Freundlich isotherm.The themodynamic parameter of sorption:enthalpy change ΔH for Yb(Ⅲ) is 50.4kJ·mol -1 .The coordination molar ratio of the functional group of MPAR to Yb(Ⅲ) is 3∶1.The bondforming conditions of MPAR for Yb(Ⅲ) is examined by IR spectrometry.
文摘The color reaction of 1(2,6dichloro4nitrophenyl)3(4nitrophenyl)Triazene(DCNPNPT)with cethyltrimethylammonium bromide(CTMAB) and cetylpyridinium bromide(CPB)were studied.In NaOH medium,DCNPNPT reacts with quartenary ammonium cationic surfactant(CTMAB,CPB)to form a purplered complex with the molar ratio of 1∶3.The molar absorptivities of CTMAB and CPB are 393×104L·mol1·cm1 and 416×104L·mol1·cm1 by using dualwavelength spectrophotometry.Beers law is obeyed in the range of 0～328×105mol·L1 for CTMAB,0～316×105 mol·L1 for CPB.The critical micella concentration of CTMAB and CPB in the color system was determined.The method was applied to the direct determination of cationic surfactant in water with satisfactory results.
文摘The adsorption behavior and mechanism of a novel chelate resin, iminodiacetic acid resin (IDAAR) for Y? were investigated. The statically saturated adsorption capacity is 102mg· g- 1 resin at 298K in HAc NaAc medium at pH 5.7. Y? adsorbed on IDAAR can be reductively eluted by 1.0～ 4.0mol· L- 1 HCl used as eluant and the elution percentages are almost as high as 100% . The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k298=3.36× 10- 5s- 1. The adsorption behavior of IDAAR for Y? conforms to Freundlich′ s model reasonably. The thermodynamic adsorption parameter, enthalpy change Δ H of IDAAR for Y? is 18.6kJ· mol- 1. The complex molar ratio of the functional group of IDAAR to Y? is about 3∶ 1. The adsorption mechanism of IDAAR for Y? was examined by using chemical method and IR spectrometry.
文摘The adsorption behavior and mechanism of amino methylene phosphonic acid resin (APAR) for praseodymium(Ⅲ) is investigated.The apparent rate constant is k 298 =2.89×10 -5 sec -1 .The adsorption behavior of APAR for Pr(Ⅲ) abides the Freundlich isotherm.The adsorption thermodynamic parameters such as enthalpy change ΔH°,free energy change ΔG° and entropy change ΔS° of adsorption (APAR) for Pr(Ⅲ) are 6.38kJ·mol -1 ,-5.27kJ·mol -1 ,39.1J·mol -1 ·K -1 ,respectively.Activation energy Ea=8.39kJ·mol -1 .The coordination molar ratio of the functional group of APAR to Pr(Ⅲ) was confirmed by chemical analysis and IR spectrometry.
