Strong enhancement of methylene blue removal from binary wastewater by in-situ ferrite process
Strong enhancement of methylene blue removal from binary wastewater by in-situ ferrite process
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原位铁氧体工艺对二元废水中亚甲基蓝的去除效果显着增强
DOI：
10.1016/j.jes.2018.01.019
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发表时间：
2018
影响因子：
6.9
通讯作者：
Baoyou Shi
中科院分区：
文献类型：
--
作者：
Haotian Hao;Yili Wang;Baoyou Shi
含重金属离子的染料废水是一种常见的工业废水，其理化性质复杂。金属-染料二元废水处理难度大。采用新型原位铁氧体工艺（IFP）处理亚甲基蓝（MB）-Cu（II）二元废水，并对工艺参数进行优化。结果表明，最佳工艺条件为：OH/M = 1.72，Cu 2 +/Fe 2 += 1/2.5，反应时间90 min，曝气量320 mL/min，反应温度40°C。此外，存在的Ca 2+和Mg 2+适度影响MB的去除。物理表征结果表明，在IFP中产生的沉淀物具有高的比表面积（232.50 m2/g）和多孔结构。基于Langmuir模型，对MB的最大吸附容量为347.82 mg/g的IFP中产生的沉淀，这优于大多数其他吸附剂。此外，IFP迅速螯合MB的去除效率5至10倍以上，通过一般的铁氧体吸附，这表明一个强大的增强MB的去除IFP。亚甲基蓝的去除过程中IFP表现出两个不同的高去除阶段，每个阶段都有相应的去除机制。在第一个短暂阶段（< 5分钟），最初的高MB去除率（~ 95%）主要是通过静电相互作用实现的。在第二个较长的阶段，扫描效应和包封效应占主导地位。
Dye wastewater containing heavy metal ions is a common industrial effluent with complex physicochemical properties. The treatment of metal–dye binary wastewater is difficult. In this work, a novelin-situferrite process (IFP) was applied to treat Methylene Blue (MB)–Cu(II) binary wastewater, and the operational parameters were optimized for MB removal. Results showed that the optimum operating conditions were OH/M of 1.72, Cu2 +/Fe2 +ratio of 1/2.5, reaction time of 90 min, aeration intensity of 320 mL/min, and reaction temperature of 40°C. Moreover, the presence of Ca2 +and Mg2 +moderately influenced the MB removal. Physical characterization results indicated that the precipitates yielded in IFP presented high surface area (232.50 m2/g) and a multi-porous structure. Based on the Langmuir model, the maximum adsorption capacity toward MB was 347.82 mg/g for the precipitates produced in IFP, which outperformed most other adsorbents. Furthermore, IFP rapidly sequestered MB with removal efficiency 5 to 10 times greater than that by general ferrite adsorption, which suggested a strong enhancement of MB removal by IFP. The MB removal process by IFP showed two different high removal stages, each with a corresponding removal mechanism. In the first brief stage (< 5 min), the initial high MB removal (~ 95%) was achieved by predominantly electrostatic interactions. Then the sweep effect and encapsulation were dominant in the second longer stage.