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首页> 外文期刊>Desalination and water treatment >Adsorption of a textile dye Ostazin Black NH from aqueous solution onto chitosan-coated perlite beads
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Adsorption of a textile dye Ostazin Black NH from aqueous solution onto chitosan-coated perlite beads

机译：纺织染料Ostazin Black NH从水溶液中吸附到壳聚糖包覆的珍珠岩珠上

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Chitosan-coated perlite beads were prepared by dropwise addition of gel containing chitosan and perlite into a precipitation bath. The structure of the beads was characterized using Fourier transform infrared spectroscopy. The surface area and microstructure of the beads were measured by Brunauer-Emmett-Teller (BET) instrument. The beads that contained chitosan enhanced the accessibility of OH and amine groups for adsorption process. Adsorption of Ostazin Black NH (OB) dye from aqueous solution on chitosan-coated perlite beads was studied using batch adsorption technique, and all parameters influencing the removal efficiency such as amount of adsorbent, pH, temperature and initial dye concentration were investigated. Adsorption of OB ions reached equilibrium concentration in 48 h. An increase in the initial dye concentration and a decrease in the temperature led to an increase in the adsorption amounts of chitosan-coated perlite beads. A decrease in the adsorption amount of OB dye was observed at high pH values. The optimum pH recorded for OB adsorption was 6-7. Experimental data were also evaluated in terms of kinetic characteristics of adsorption, and it was found that adsorption process followed well pseudo-second-order kinetics. Langmuir and Freundlich isotherms were studied for the adsorption data over a concentration range of 20-80 mg/L. Adsorption isotherms were well fitted with the Freundlich model, and the maximum adsorption capacity was 21.11 mg/g. Thermodynamic study was also performed to determine the feasibility of adsorption process. The results of thermodynamic parameters (Delta G degrees,Delta H degrees, and Delta S degrees) showed that the adsorption of OB onto the chitosan-coated perlite beads was exhothermic and spontaneous in nature. The chitosan- coated perlite beads are very promising for the removal of dye from wastewater due to their low cost of production and high removal efficiencies.
机译：通过将含有壳聚糖和珍珠岩的凝胶滴加到沉淀浴中来制备壳聚糖包被的珍珠岩珠。珠的结构使用傅立叶变换红外光谱法表征。通过Brunauer-Emmett-Teller（BET）仪器测量珠的表面积和微结构。含有壳聚糖的珠粒提高了OH和胺基团对吸附过程的可及性。采用分批吸附技术研究了Ostazin Black NH（OB）染料在壳聚糖包被的珍珠岩微珠上的吸附性能，研究了影响去除效率的所有参数，如吸附量，pH，温度和初始染料浓度。 OB离子的吸附在48小时内达到平衡浓度。初始染料浓度的增加和温度的降低导致壳聚糖包被的珍珠岩珠粒的吸附量增加。在高pH值下观察到OB染料的吸附量减少。 OB吸附记录的最佳pH为6-7。还根据吸附的动力学特性评估了实验数据，发现吸附过程遵循良好的伪二级动力学。研究了Langmuir和Freundlich等温线在20-80 mg / L浓度范围内的吸附数据。吸附等温线与Freundlich模型完全吻合，最大吸附容量为21.11 mg / g。还进行了热力学研究，以确定吸附过程的可行性。热力学参数（ΔG度，ΔH度和ΔS度）的结果表明，OB在壳聚糖包被的珍珠岩珠上的吸附是放热的，并且是自然产生的。壳聚糖涂覆的珍珠岩珠因其生产成本低和去除效率高而非常有希望从废水中去除染料。

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