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endothermic nature
相关语句
  过程是吸热
     The changes of adsorption enthalpy value (ΔH) of 4.16 kJ/mol indicated the endothermic nature of the adsorption process.
     吸附焓变化(ΔH)值为4.16kJ/mol说明这一过程是吸热过程。
短句来源
  “endothermic nature”译为未确定词的双语例句
     Heat of adsorption (?Hm) value of 58.77 kJ/mol indicated the endothermic nature of the adsorption process.
     Hm=58.77kJ/mol,熵变?
短句来源
     They are commercially prepared by the traditional pyrolysis with the characteristics of high-energy consumption and high CO2 emission. Due to its strong endothermic nature, the further development in the pyrolysis is inhibited.
     目前,其仍以高能耗、高CO_2排放的热裂解生产过程为主,热裂解的强吸热特性使其进一步发展的空间变小。
短句来源
     Thermodynamic parameters depict the endothermic nature of adsorption and the process is spontaneous.
     热力学参数表明,吸附过程是自发的和吸热的。
短句来源
     The thermodynamic parameter, △G°<0, was negative, indicating that the nature of adsorption process is spontaneous, △H°>0 being positive, showing the endothermic nature of the adsorption process.
     H°>0,表明水溶液中铜离子在沸石上的吸附是一个自发的、吸热的过程。 D-R等温方程拟合计算结果反映该吸附过程中主要为离子交换过程。
短句来源
  相似匹配句对
     Nature in Nature
     从大自然走来的“大自然”
短句来源
     On the Nature of City
     换个角度谈城市本质
短句来源
     Thermodynamic parameters depict the endothermic nature of adsorption and the process is spontaneous.
     热力学参数表明,吸附过程是自发的和吸热的。
短句来源
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  endothermic nature
The negative values of free energy change (ΔG°) indicated the spontaneous nature ofthe adsorption and positive values of enthalpy change (ΔG°) suggested the endothermic nature ofthe adsorption process.
      
Thermodynamic parameters suggested the endothermic nature of the adsorption process.
      
These values indicate the endothermic nature of the adsorption process.
      
DSC measurements confirm the endothermic nature of this effect.
      
The Langmuir constants were calculated at different temperatures, and the sorption capacity increased with rising temperature, indicating the endothermic nature of the Cr(VI) sorption onto the sorbent.
      
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The kinetic process of adsorption and decolorrization for apple juice by using LSA-800B adsorbent resin were studied at different concentrations (1,2,4,8 g adsorbent resin per liter of apple juice) and temperature (25~70℃).The results showed that the adsorption data of LSA—800B adsorbent resin fitted well with both Langmuir and Freundlich models. The parameters of the models (K_(ad), Q_0, K_f and n) were also obtained at different temperatures. The changes of adsorption enthalpy value (ΔH) of 4.16 kJ/mol indicated...

The kinetic process of adsorption and decolorrization for apple juice by using LSA-800B adsorbent resin were studied at different concentrations (1,2,4,8 g adsorbent resin per liter of apple juice) and temperature (25~70℃).The results showed that the adsorption data of LSA—800B adsorbent resin fitted well with both Langmuir and Freundlich models. The parameters of the models (K_(ad), Q_0, K_f and n) were also obtained at different temperatures. The changes of adsorption enthalpy value (ΔH) of 4.16 kJ/mol indicated the endothermic nature of the adsorption process. A decrease of Gibbs free energy (ΔG) with temperature increase also indicated the spontaneous nature of the process. The kinetic parameters of the adsorption and decolorrization for apple juice at different temperatures using adsorbent resin of different concentrations were also determined The adsorption ability was improved with increasing temperature, but the initial equilibrium time was decreased. The adsorption effect was comparatively evident at 2~4 g/L resin concentration, also the cover rate(θ_e) reached to initial equilibrium was higher at 55℃. Hereby, the suitable temperature and concentration for the adsorption and decolorrization of apple juice by using the resin can be defined as 55℃ and 2~4 g/L.

该文研究了不同温度(25℃~70℃)和不同树脂浓度(1,2,4,8g/L)条件下LSA—800B树脂对苹果汁吸附脱色的动力学过程。试验结果表明,该树脂吸附平衡曲线符合Langmuir和Freundlich模型,获得了不同温度下的模型参数值(Kad、Q0、Kf和n)。吸附焓变化(ΔH)值为4.16kJ/mol说明这一过程是吸热过程。自由能(ΔG)随温度升高而呈下降趋势说明此过程是自发过程。由试验数据进一步计算出了不同树脂浓度和不同温度下苹果汁吸附脱色的动力学参数。随着温度升高吸附能力提高,但初始平衡时间有所减少;在2~4g/L的树脂浓度范围内,吸附效果比较明显,在55℃时,树脂达到初始平衡的覆盖率(θe)较高,据此确定了该树脂对苹果汁吸附脱色的适宜温度和树脂浓度范围分别为55℃,2~4g/L。

Dynamics and thermodynamics of adsorption of ursolic acid by X-5 macroporous resin were investigated. It is a novel method of adsorption using the macroporous resin for natural products from physical chemistry. Dynamics results showed that the maximum adsorption capacity of 0.1016 mmol/g was obtained at the temperature of 298K and pH of 6.36. The isothermal process of adsorption could be described by Langmuir equation and Freundlich equation. Heat of adsorption (?Hm) value of 58.77 kJ/mol indicated the endothermic...

Dynamics and thermodynamics of adsorption of ursolic acid by X-5 macroporous resin were investigated. It is a novel method of adsorption using the macroporous resin for natural products from physical chemistry. Dynamics results showed that the maximum adsorption capacity of 0.1016 mmol/g was obtained at the temperature of 298K and pH of 6.36. The isothermal process of adsorption could be described by Langmuir equation and Freundlich equation. Heat of adsorption (?Hm) value of 58.77 kJ/mol indicated the endothermic nature of the adsorption process. A decrease of Gibbs free energy (?Gm) with increasing temperature also indicated the spontaneous nature of the process. The positive sign of ?Sm value of 0.23 kJ/mol·K showed the increased randomness at the solid-solution interface during adsorption.

研究了熊果酸在X-5树脂上吸附的动力学和热力学特性,从物理化学的角度探讨了树脂吸附天然产物的机理。动力学结果表明,在pH=6.36时,熊果酸在X-5树脂上吸附量最大,吸附量为0.1016mmol/g。热力学结果表明,不同温度下熊果酸在X-5树脂上的等温吸附符合Langmuir方程和Freundlich方程,吸附热焓变?Hm=58.77kJ/mol,熵变?Sm=0.23kJ/mol·K,吉布斯自由能?Gm随温度升高向负方向增加。以上热力学参数表明,熊果酸在X-5树脂上的吸附属于自发的物理吸附过程,且在X-5大孔树脂吸附熊果酸过程中,液固界面间增加了随机性吸附。

In this study, Na-mordenite was used as an adsorbent for the aim of removing Cu(Ⅱ) ions from the aqueous solutions, and the effects of contact time, temperature, initial metal ion concentrations, initial solution pH, adsorbent dosage and ionic strength in the adsorption process were investigated in detail. Experimental results showed that the sorption process follows pseudo-second-order kinetics very well, the correlation coefficients R2 all reached 0.999, and the rate constant of this kinetics model for the...

In this study, Na-mordenite was used as an adsorbent for the aim of removing Cu(Ⅱ) ions from the aqueous solutions, and the effects of contact time, temperature, initial metal ion concentrations, initial solution pH, adsorbent dosage and ionic strength in the adsorption process were investigated in detail. Experimental results showed that the sorption process follows pseudo-second-order kinetics very well, the correlation coefficients R2 all reached 0.999, and the rate constant of this kinetics model for the adsorption processes, k2, increased with the increasing temperatures. The isothermal data could be well described by the Langmuir, Freundlich, Dubinin-Radushkevich(D-R) adsorption isothermal equations. The thermodynamic parameter, △G°<0, was negative, indicating that the nature of adsorption process is spontaneous, △H°>0 being positive, showing the endothermic nature of the adsorption process. This adsorption processes were dominated by the ion exchange. The amount of adsorbed copper ions increased with the increasing initial metal ion concentration and solution pH in the examined range, but decreased with the increasing dosage of adsorbent and ionic strength.

研究了沸石吸附水溶液中铜离子时多种因素(时间、吸附温度、初始浓度、pH值、吸附剂量、离子强度等)对吸附过程的影响。实验结果表明,沸石对铜离子的吸附过程能很好地遵循准二级动力学模型,其相关性系数均达到0.999,且吸附速率常数k2随吸附过程的温度升高而增加。其相应的吸附过程的活化能Ea为11.256kJmol/L。Langmuir、Freundlich及Dubinin-Radushkevich(D-R)等方程可较好地拟合热力学数据。吸附过程的热力学参数!G°<0、!H°>0,表明水溶液中铜离子在沸石上的吸附是一个自发的、吸热的过程。D-R等温方程拟合计算结果反映该吸附过程中主要为离子交换过程。沸石对铜离子的单位吸附量随初始浓度的升高而增大;在pH2~6间随pH升高而增加;增大吸附剂投加量有利于提高吸附效率,向溶液中加入一定量的NaNO3则会使沸石对铜离子的吸附能力降低。

 
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