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Nie S.,Guangxi University | Wu Z.,Guangxi University | Liu J.,Guangxi University | Liu X.,Guangxi University | And 4 more authors.
Appita Journal | Year: 2013

The first chlorine dioxide stage (D0) in the ECF bleaching of a soda AQ bagasse pulp has been investigated using response surface methodology (RSM) for experimental design. The effects and interactions of the available chlorine dosage, the reaction temperature and the pH value, on the adsorbed organic halogen (AOX) content of wastewater as well as the brightness and viscosity of the pulp were examined. The optimal reaction conditions to achieve a balance of reduced AOX content, higher brightness and higher viscosity were: available chlorine dosage of 3.7%, reaction temperature of 76 °C and pH 8.8. Under these conditions, AOX content of 14.7 mg/L, brightness of 52.4% ISO and viscosity of 929 mL/g were observed. To the authors' knowledge these results provide the only detailed study of AOX formation in ECF bleaching of Soda AQ pulp from bagasse. By and large the effects of process variables were similar to those seen in ECF bleaching of kraft pulps. Source


Changli O.,Guangxi University | Xinliang L.,Guangxi University | Fang H.,Guangxi University | Shuangxi N.,Guangxi University | And 3 more authors.
Advanced Materials Research | Year: 2012

It was detail studied that the preparation of new chelating materials derived from bagasse pith for adsorption of Cu 2+ ion. The bagasse pith was modified by the ethylenediaminetetraacetic dianhydride (EDTAD) and the mechanism of sorption property for heavy metal ion was studied. The FTIR was used to characterize the esterified pith(EP). The results show that the optimal conditions are 24 h of reaction time and 1.5 g of EDTAD dosage and the maximum adsorption capacity for Cu 2++ is 76.76mg/g. The peaks at 1743 cm -1, 1598 cm -1,1408 cm -1 in FTIR suggest carbonyl functions in the materials. The Langmuir model can describe the process of adsorbing Cu 2++onto EP well. © (2012) Trans Tech Publications, Switzerland. Source


Liu X.,Guangxi University | Wang L.,Guangxi University | Song X.,Guangxi University | Song H.,Guangxi University | And 3 more authors.
Carbohydrate Polymers | Year: 2012

In this paper, some key parameters, such as the system pH, the periodate concentration, and the reaction temperature, on the influence of the bagasse fiber degradation were studied based on the oxygenant of periodate. And the feasible reaction mechanism was also discussed through the FTIR characterization for bagasse fiber before and after the oxidizing reaction. As the results shown, the crystallinity of bagasse fiber decreased with the oxidation level increasing. It was interesting that the aldehyde content of the reaction system rose gradually along with cellulose degradation. Based on this result, the selective oxidation kinetics was constructed by introducing of variable factor R (the ratio of aldehyde content to the degradation of cellulose fiber), and the results shown that there was a better correlation between the dynamic model and the experimental data, so the oxidation degree of bagasse fiber oxidized by periodate can be quantitative evaluated based on this model. Source


Nie S.,Guangxi University | Liu X.,Guangxi University | Wu Z.,Guangxi University | Zhan L.,Guangxi University | And 5 more authors.
Chemical Engineering Journal | Year: 2014

Kinetics study of oxidation of 1-(3,4-Dimethoxyphenyl)ethanol (MVA), a lignin model compounds, with chlorine dioxide under simulated bleaching conditions were investigated. The UV-vis spectrophotometer was employed to characterize the reaction products of chlorine dioxide and 1-(3,4-Dimethoxyphenyl)ethanol. A possible reaction mechanism was proposed. The results showed the chlorination and oxidizing reaction of 1-(3,4-Dimethoxyphenyl)ethanol coexisted. The hypochlorous acid was the main reason to form adsorbable organic halides (AOX). An overall second-order rate equation was also established from UV-vis spectra results. It was shown as: -d[ClO2]/dt=k'[MVA][ClO2], where k' refers to observed second-order rate constants. The results showed the kinetics model correlated well with the experimental data, so the degree of 1-(3,4-Dimethoxyphenyl)ethanol oxidized by chlorine dioxide can be quantitative evaluated based on this model. AOX formation characteristic and practical implications of this work were investigated based on the kinetics and mechanism, which might bring a new door open for resolving the major problems of environmental pollution in elemental chlorine free (ECF) bleaching of pulp. © 2013 Elsevier B.V. Source


Wu Q.,University of Science and Technology of China | Chen H.L.,University of Science and Technology of China | Wang B.B.,University of Science and Technology of China | Cao B.B.,Guangxi BOSSCO Environment Protecting Technology Co.
Applied Mechanics and Materials | Year: 2014

Fiber morphology, chemical composition and wood characteristic of fast-growing black poplar branch were studied. Meanwhile, pulping performance of it used for alkaline peroxide mechanical pulp (APMP) was discussed preliminarily. The research results showed that the fast-growing black poplar branch can be used as raw materials for APMP pulping and papermaking. © (2014) Trans Tech Publications, Switzerland. Source

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