Showing papers by "Yuh-Shan Ho published in 1999"

Comparative sorption kinetic studies of dye and aromatic compounds onto fly ash

Abstract: A pseudo‐second order and a pseudo‐first order mechanism for the sorption of Omega Chrome Red ME as well as o‐cresol and p‐nitrophenol onto fly ash have been compared. Intraparticle diffusion processes and chemical sorption processes for the sorption also have been studied. The batch data for the sorption of Omega Chrome Red ME, o‐cresol and p‐nitrophenol onto fly ash have been analysed to predict the rate constant of sorption based on the assumption of a pseudo‐second order mechanism. The equilibrium capacity and initial sorption rate have also been determined to study the effect of initial solute concentration and temperature on the sorption process. An activation energy of sorption has also been evaluated using the pseudo‐second order rate constants.

A kinetic study of dye sorption by biosorbent waste product pith

Abstract: The sorption of two dyes, namely, Basic Red 22 and Acid Red 114 onto pith has been studied in terms of pseudo-second-order, pseudo-first-order sorption and intraparticle diffusion processes thus comparing chemical sorption and diffusion sorption processes. The pseudo-second-order model, based on the assumption of a pseudo-second-order mechanism, has been developed to predict the rate constant of sorption, the equilibrium capacity and initial sorption rate as a function of the effect of initial dye concentration, pith particle size, pith dose and temperature.

Biosorption of Copper from Waste Waters: A Review

Abstract: A comprehensive literature review has been carried out on the sorption of copper ions onto various biosorbents. Extensive research has been carried out using peat as a sorbent and the sorption capacity of copper on different peats varies by a factor of over fifty. Furthermore, this paper identifies that copper sorption capacities have been reported for over thirty other different biosorbents. The paper reviews the capacities of the various biosorbents for copper and discusses the range of kinetic mechanisms used by different researches to correlate kinetic experimental data. The suitability of the various kinetic models for the sorption of copper from wastewaters onto different biosorbents is discussed. The review identifies several deficiencies in the literature. Many of the studies on equilibrium isotherms only apply one method of analysis. Researchers fail to test experimental equilibrium date using several models and do not determine the best tit model by error analysis or by postulating a so...

Competitive Sorption of Copper and Nickel Ions from Aqueous Solution Using Peat

Abstract: Bicomponent aqueous solutions of copper and nickel ions have been used to investigate the sorption of metal ions onto peat. Peat, a low cost sorbent, has shown a high capacity for the sorption of single component metal ions attributed to extensive carboxylic acids within its structure. Copper and nickel ions were selected as typical metals in the effluents of electroplating industries. The effects of competitive sorption in batch systems were studied at various metal ion concentrations. In this study the Butler and Ockrent model was modified using a coefficient, η. Two models were developed based on the interaction coefficient η. The first model incorporates a constant fixed η factor for each metal ion into the Butler-Ockrent equation. The second model incorporates a variable η factor into the Butler-Ockrent equation; this interaction factor varies as a function of sorbent surface coverage. Predicted equilibrium data are found to be in excellent agreement with experimental values using both modified models for various mole ratios of copper and nickel ions in competitive sorption.

A multi-stage batch sorption design with experimental data

Abstract: The sorption of lead ions on to peat in an agitated batch adsorber has been studied. A model has been developed for the design of a two-stage batch adsorber based on pseudo second-order sorption ki...