Kinetics, equilibrium and thermodynamics studies of arsenate adsorption from aqueous solutions onto iron hydroxide

T. Mahmood; S.U. Din; A. Naeem

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Kinetics, equilibrium and thermodynamics studies of arsenate adsorption from aqueous solutions onto iron hydroxide

机译：水溶液中砷酸盐吸附到氢氧化铁上的动力学，平衡和热力学研究

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This paper reports the equilibrium, kinetics and thermodynamic studies of arsenate adsorption onto freshly precipitated iron hydroxide. Adsorption of arsenate onto iron hydroxide depends on arsenate concentration, contact time and temperature. The intrapartical diffusion model indicates that both the film and intrapartical diffusion control arsenate adsorption on iron hydroxide. The values of activation energies (E_a) indicate the chemical nature of adsorption accompanied by diffusion controlled processes as the rate limiting step. The endothermic nature of the adsorption process suggests that adsorption reaction consumes energy. The negative values of ΔS~# can be assigned to decreased randomness at the solid liquid interface.

机译：本文报道了砷在新鲜沉淀的氢氧化铁上吸附的平衡，动力学和热力学研究。砷酸盐在氢氧化铁上的吸附取决于砷酸盐的浓度，接触时间和温度。颗粒内扩散模型表明膜和颗粒内扩散均控制砷酸盐在氢氧化铁上的吸附。活化能的值（E_a）表示伴随速率控制步骤的伴随扩散控制的吸附过程的化学性质。吸附过程的吸热性质表明吸附反应消耗能量。 ΔS〜＃的负值可以分配给固液界面的随机性降低。

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《Journal of industrial and engineering chemistry》 |2014年第5期|共9页
作者
T. Mahmood; S.U. Din; A. Naeem;
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正文语种 eng
中图分类化学工业;
关键词
Sorption; Arsenate; Metal oxide; Film diffusion;

机译：吸附;砷酸盐;金属氧化物;膜扩散;

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Kinetics, equilibrium and thermodynamics studies of arsenate adsorption from aqueous solutions onto iron hydroxide

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