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首页> 外文期刊>Journal of Polymers and the Environment >Application of Immobilized Aspergillus niger in Alginate for Decolourization of Congo Red Dye by Using Kinetics Studies
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Application of Immobilized Aspergillus niger in Alginate for Decolourization of Congo Red Dye by Using Kinetics Studies

机译：用动力学研究将固定化曲霉抗生素藻酸盐的应用

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摘要

Discharges of disposal of the textile industry into general water bodies can cause deterioration of aquatic ecosystems and adversely affect human health. The objective of this study is to assess the Congo red dye decolourization by immobilizedAspergillus nigerobtained from textile dye wastewater. The effect of experimental parameters like pH 5, contact time (30 h) and initial dye concentration (50 mg/L) on the process of decolourization of dye in the aqueous solution was revealed 97%. The optimum dye decolourization efficiency of immobilizedAspergillus nigerusing central composite design was found to be 98.97%, obtained were pH 5, initial concentration 50 mg/L, temperature 30 degrees C and contact time 36 h. Isotherm studies showed that the experimental data better fitted with to Langmuir isotherm, the Freundlich isotherm and Tempkin isotherm for decolourization dye by immobilizedAspergillus niger. It was found that the decolourization was best evaluated by a pseudo-second-order model rather than the pseudo-first-order model. The maximum monolayer adsorption capacity of immobilizedAspergillus nigerwas resulted as 4325 mg/g at 303 K (R-2 = 0.994). The value of separation factor (RL) from Langmuir equation and Freundlich constant (n) indicated on favorability of bioabsorption. Thermodynamic parameters such as Delta G degrees, Delta H degrees and Delta S degrees were calculated and the negative value of Delta H degrees (- 29,671 kJ/mol) for corresponding initial Congo red dye concentrations: 50 mg/L, in the solution indicated that the bioabsorption was of exothermic reaction.. The UV-Vis and FTIR analysis of metabolites after treatment confirmed that the decolourization. Phytotoxicity test confirmed that was less toxic than original dye. The reusability of the immobilizedAspergillus nigerwas repeated with seven cycles and removal efficiency ranged from 98 to 42%.
机译：将纺织工业处置成一般水体的排放可能导致水生生态系统的恶化，对人类健康产生不利影响。本研究的目的是通过纺织染料废水中的Immobileaizaspergillus患者评估刚果红染料脱色。揭示了水溶液中染料脱色过程中的实验参数等实验参数，接触时间（30h）和初始染料浓度（50mg / L）的效果揭示了97％。最佳染料脱脂酚醛化患者的中央复合设计的奈及利亚尼指数为98.97％，得到pH5，初始浓度50mg / L，温度30℃，接触时间36小时。等温的研究表明，通过Immobilizedaspergillus尼日尔脱色脱色染料，对兰姆润等温线更好地安装到Langmuir等温线的实验数据。发现脱色是由伪二阶模型而不是伪第一阶模型评估的脱色。 Immobilizedaspergillus Nigerwas的最大单层吸附能力为303k（R-2 = 0.994）为4325mg / g。来自Langmuir方程和Freundlich常数（n）的分离因子（R1）的值表明了生物吸收的利益性。计算ΔG度，δH度和δS度等热力学参数，并且δH度（ - 29,671 kJ / mol）的相应初始刚果红染料浓度的负值：50mg / L，表明生物吸放是放热反应。治疗后代谢物的UV-Vis和FTIR分析证实脱色。植物毒性试验证实的毒性不如原始染料。 Immobilizedaspergillus尼格斯尼格斯的可重复用来重复七个循环和去除效率范围为98至42％。

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