Adsorption process optimization of Congo red in water samples by micro-porous spherical magnesium hydroxide

doi:10.16085/j.issn.1000-6613.2016-2188

Abstract

Abstract: In order to solve the problem for the difficulty of mixture filtration in the process of dye wastewater purification by magnesium hydroxide,a new synthesis method of spherical magnesium hydroxide and its process for purification of Congo red wastewater were proposed.Using magnesium sulfate heptahydrate,sodium hydroxide and ammonia as raw materials,the spherical magnesium hydroxide was prepared under the condition of crystal formation controlling agent.The spherical product was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The adsorption behavior of Congo red on micro-porous spherical magnesium hydroxide in aqueous solution was studied by jar test.The effect of magnesium hydroxide dosing,time,solution pH,oscillation speed and temperature on the adsorption was comprehensively investigated.The study showed that the spherical magnesium hydroxide dosing,time,pH and temperature have major influence on the adsorption of Congo red,while the oscillation speed has a minor effect on its adsorption.The optimized adsorption process conditions are as follows.The oscillation adsorption temperature is room temperature.The amount of the micro porous spherical magnesium hydroxide is 2g/L.The adsorption time is 70min.The pH of the Congo red solution is adjusted to 4-8.The adsorption oscillation speed is 220r/min.Under these adsorption process conditions,the adsorption rate is 93.29% with the initial concentration of Congo red of 100mg/L.The adsorption equilibrium experiments showed that at the initial pH of 2 and the temperature of 40℃,the Langmuir model is more suitable for the adsorption of Congo red on spherical magnesium hydroxide.However,when the Congo red wastewater pH is up to between 4 and 8,the Freundlich model is probably more suitable for its adsorption behavior on the spherical magnesium hydroxide.

Key words: micro-porous spherical, magnesium hydroxide, preparation, adsorption, Congo red

摘要： 为了解决氢氧化镁净化染料废水过程中过滤难的问题，提出了一种球状氢氧化镁的合成方法以及刚果红废水净化处理工艺。采用七水硫酸镁、氢氧化钠和氨水为原料，在晶型控制剂条件下制备球状氢氧化镁，利用X射线衍射仪（XRD）、扫描电子显微镜（SEM）等对产物进行表征。通过振荡实验研究了微孔球状氢氧化镁对水溶液中刚果红的吸附行为，分别考察氢氧化镁加入剂量、时间、溶液pH、振荡转速、温度等因素对吸附效果的影响。研究表明，球状氢氧化镁加入剂量、时间、溶液pH、温度对氢氧化镁吸附刚果红影响较大，振荡转速对其吸附影响较小。同时，在刚果红初始浓度为100mg/L时，得到其最佳吸附工艺条件为：在室温下，微孔球状氢氧化镁的投入量为2g/L，吸附时间为70min，刚果红溶液的pH调节到4~8，吸附振荡转速为220r/min。在此吸附工艺条件，对刚果红初始浓度为100mg/L的吸附率高达93.29%。吸附平衡实验表明，在刚果红废水溶液初始pH为2和吸附温度为40℃时，球状氢氧化镁对刚果红分子的吸附更符合Langmuir模型；刚果红废水溶液初始pH在4~8时，Freundlich吸附模式更适合描述球状氢氧化镁对刚果红的吸附。

关键词: 微孔球状, 氢氧化镁, 制备, 吸附, 刚果红

CLC Number:

TQ09

JIANG Demin, CHEN Shuhong, LAI Qingke, HUANG Meiying, CHEN Mingjun, CHEN Jianjun, HE Yang. Adsorption process optimization of Congo red in water samples by micro-porous spherical magnesium hydroxide[J]. Chemical Industry and Engineering Progress, 2017, 36(07): 2707-2713.

蒋德敏, 陈书鸿, 赖庆轲, 黄美英, 陈明君, 陈建钧, 何阳. 微孔球状氢氧化镁对水样中刚果红的吸附工艺优化[J]. 化工进展, 2017, 36(07): 2707-2713.

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