Remediation and Optimisation of Petroleum Hydrocarbon Degradation in Contaminated Water by Persulfate Activated with Bagasse Biochar-Supported Nanoscale Zerovalent Iron
Remediation and Optimisation of Petroleum Hydrocarbon Degradation in Contaminated Water by Persulfate Activated with Bagasse Biochar-Supported Nanoscale Zerovalent Iron
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DOI：
10.3390/su14159324
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发表时间：
2022-07
期刊：
影响因子：
3.9
通讯作者：
Ronghai Zhang;Yudao Chen;Shudi Li;Zhuangmian Wei;He Huang;Tian Xie
中科院分区：
文献类型：
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作者：
Ronghai Zhang;Yudao Chen;Shudi Li;Zhuangmian Wei;He Huang;Tian Xie
以甘蔗渣为原料制备生物炭（BC），并成功负载纳米零价铁（nZVI）制备出BC负载的nZVI，称为nZVI@BC。使用nZVI@ BC活化的过硫酸盐（PS）（称为nZVI@BC/PS）修复总石油烃（TPH）污染的水获得了令人满意的结果。通过单因素试验和批试验考察了nZVI@BC、DnZVI@BC投加量、PS、CPS浓度、初始pH、pH值3个因素对TPH去除效果的影响。结果表明：各因素对制备的nZVI@BC/PS反应体系去除TPH的性能影响较大。TPH的降解过程符合一级动力学模型。响应面法（RSM）被用于串联与Box-Behnken设计，以优化参与TPH降解的变量。三个影响变量（即，在实验过程中，DnZVI@BC、CPS和pHi）分别设定在0.4- 1.0g/L、20-160 g/L和2.21-9.42的范围内。用于拟合实验数据的优化二次模型显示出高水平的显著性（p < 0.0001），具有非常高的回归值（R2 = 0.9906;调整的R2 = 0.9786）。回归和方差分析表明，二次模型充分解释了TPH降解速率。电子顺磁共振（EPR）光谱分析的nZVI@BC/PS系统显示，SO 4-·，·OH，O2-·，和1 O2参与的活化和降解过程。本研究结果表明，nZVI@ BC活化PS系统具有很大的应用潜力，在TPH污染的废水处理和环境可持续发展。
In this study, biochar (BC) was prepared from bagasse and then successfully loaded with nanoscale zerovalent iron (nZVI) to produce BC-supported nZVI, termed nZVI@BC. Satisfactory results were obtained using a nZVI@BC-activated persulfate (PS), termed nZVI@BC/PS, to remediate total petroleum hydrocarbons (TPH)-contaminated water. The effects of three influencing factors—the dosage of nZVI@BC, DnZVI@BC, the concentration of PS, CPS, and the initial pH, pHi—on TPH removal were examined through single-factor and batch tests. The results show the following. Each factor considerably influenced the performance of the prepared nZVI@BC/PS reaction system in removing TPH. The TPH degradation process conformed to a first-order kinetic model. The response surface method (RSM) was used in tandem with a Box–Behnken design to optimise the variables involved in TPH degradation. The three influencing variables (i.e., DnZVI@BC, CPS, and pHi) were set in the range of 0.4–1.0 g/L, 20–160 g/L, and 2.21–9.42, respectively, during the experiment. An optimised quadratic model used to fit the experimental data displayed a high level of significance (p < 0.0001) with a very high regression value (R2 = 0.9906; adjusted R2 = 0.9786). Analyses of regression and variance revealed that the quadratic model sufficiently explains the TPH degradation rate. An electron paramagnetic resonance (EPR) spectroscopic analysis of the nZVI@BC/PS system revealed that SO4−·, ·OH, O2−·, and 1O2 participated in the activation and degradation processes. The results of this study show that nZVI@BC-activated PS systems possess great potential for applications in TPH-contaminated wastewater treatment and environmentally sustainable development.