Remediation of bio-refinery wastewater containing organic and inorganic toxic pollutants by adsorption onto chitosan-based magnetic nanosorbent

IF 2.4 4区 环境科学与生态学 Q2 WATER RESOURCES Water Quality Research Journal Pub Date : 2020-02-01 DOI:10.2166/wqrj.2019.003
A. Kumar, Kongkona Saikia, Gerard Neeraj, H. Cabana, Vaidyanathan Kumar
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引用次数: 17

Abstract

The novelty of the current study deals with the application of magnetic nanosorbent, chitosan-coated magnetic nanoparticles (cMNPs), to be utilized for the management of lignocellulosic bio-refinery wastewater (LBW) containing three heavy metals and 26 phenolic compounds. The magnetic property of the adsorbent, confirmed by elemental and vibrating sample magnetometer analysis (saturation magnetization of 26.96 emu/g), allows easy separation of the particles in the presence of an external magnetic field. At pH 6.0, with optimized adsorbent dosage of 2.0 g/L and 90 min contact time, maximum removal of phenol (46.2%), copper (42.2%), chromium (18.7%) and arsenic (2.44%) was observed. The extent of removal of phenolic compounds was in the order: polysubstituted > di-substituted > mono-substituted > cresol > phenol. Overall, the adsorption capacity (qe) of cMNPs varies among the different contaminants in the following manner: copper (1.03 mg/g), chromium (0.20 mg/g), arsenic (0.04 mg/g) and phenol (0.56 mg/g). Post-adsorption, retrieving the cMNPs using an external magnetic field followed by single-step desorption via acid–base treatment is attractive for implementation in industrial settings. Reusability of the adsorbent was studied by recycling the cMNPs for five consecutive rounds of adsorption followed by desorption, at the end of which, cMNPs retained 20% of their initial adsorption capacity.
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壳聚糖基磁性纳米吸附剂吸附修复含有机和无机有毒污染物的生物炼油厂废水
本研究的新颖之处在于应用磁性纳米吸附剂,即壳聚糖包覆的磁性纳米颗粒(cMNPs),用于处理含有三种重金属和26种酚类化合物的木质纤维素生物炼油废水。通过元素和振动样品磁强计分析(26.96emu/g的饱和磁化强度)证实,吸附剂的磁性能允许在存在外部磁场的情况下容易地分离颗粒。在pH 6.0条件下,当吸附剂用量为2.0g/L,接触时间为90min时,苯酚(46.2%)、铜(42.2%)、铬(18.7%)和砷(2.44%)的去除率最高。酚类化合物的去除程度依次为:多取代>二取代>单取代>甲酚>苯酚。总的来说,cMNPs的吸附容量(qe)在不同污染物之间以以下方式变化:铜(1.03mg/g)、铬(0.20mg/g)、砷(0.04mg/g)和苯酚(0.56mg/g)。吸附后,使用外部磁场回收cMNP,然后通过酸碱处理进行一步解吸,这对于在工业环境中实施很有吸引力。吸附剂的可重复使用性是通过将cMNPs循环进行连续五轮吸附,然后进行解吸来研究的,在解吸结束时,cMNPs保留了其初始吸附容量的20%。
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4.50
自引率
8.70%
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