Mengting Zhu, Kurniawan Tonni Agustiono, Avtar Ram, Othman Mohd Hafiz Dzarfan, Ouyang Tong, Yujia Huang, Xueting Zhang, Setiadi Tjandra, Iswanto Iswanto
Key Laboratory of the Coastal and Wetland Ecosystems (Xiamen University), Ministry of Education, College of the Environment and Ecology, Xiamen University, Fujian 361102, China.
Key Laboratory of the Coastal and Wetland Ecosystems (Xiamen University), Ministry of Education, College of the Environment and Ecology, Xiamen University, Fujian 361102, China; Department of Energy, Environment, and Climate Change, School of Environment Resources and Development (SERD), Asian Institute of Technology (AIT), Pathumthani 12120, Thailand.
J Hazard Mater. 2021 Mar 5;405:123999. doi: 10.1016/j.jhazmat.2020.123999. Epub 2020 Sep 17.
We test the feasibility of TiO(B)@carbon composites as adsorbents, derived from wheat straws, for tetracycline (TC) adsorption from aqueous solutions. Hydrochar (HC), biochar (BC), and hydrochar-derived pyrolysis char (HDPC) are synthesized hydrothermally from the waste and then functionalized with TiO(B), named as 'Composite-1', 'Composite-2', and 'Composite-3', respectively. A higher loading of TiO(B) into the HC was also synthesized for comparison, named as 'Composite-4'. To compare their physico-chemical changes before and after surface modification, the composites are characterized using FESEM-EDS, XRD, BET, FRTEM, and FTIR. The effects of HO addition on TC removal are investigated. Adsorption kinetics and isotherms of TC removal are studied, while TC adsorption mechanisms are elaborated. We found that the Composite-4 has the highest TC removal (93%) at pH 7, 1 g/L of dose, and 4 h of reaction time at 50 mg/L of TC after adding HO (10 mM). The TC adsorption capacities of the Composite-1 and Composite-4 are 40.65 and 49.26 mg/g, respectively. The TC removal by the Composite-1 follows the pseudo-second order. Overall, this suggests that converting the wheat straw into HC and then functionalizing its surface with TiO(B) as a composite has added values to the waste as an adsorbent for wastewater treatment.
我们测试了源自小麦秸秆的TiO(B)@碳复合材料作为吸附剂从水溶液中吸附四环素（TC）的可行性。通过水热法由废弃物合成了水热炭（HC）、生物炭（BC）和水热炭衍生的热解炭（HDPC），然后分别用TiO(B)进行功能化处理，命名为“复合材料-1”、“复合材料-2”和“复合材料-3”。还合成了TiO(B)负载量更高的HC用于比较，命名为“复合材料-4”。为了比较表面改性前后它们的物理化学变化，使用场发射扫描电子显微镜-能谱仪（FESEM-EDS）、X射线衍射仪（XRD）、比表面积分析仪（BET）、场发射透射电子显微镜（FRTEM）和傅里叶变换红外光谱仪（FTIR）对复合材料进行了表征。研究了添加过氧化氢（HO）对TC去除效果的影响。研究了TC去除的吸附动力学和等温线，同时阐述了TC的吸附机制。我们发现，在添加HO（10 mM）后，在pH值为7、剂量为1 g/L、反应时间为4 h、TC浓度为50 mg/L的条件下，复合材料-4对TC的去除率最高（93%）。复合材料-1和复合材料-4对TC的吸附容量分别为40.65和49.26 mg/g。复合材料-1对TC的去除遵循准二级动力学。总体而言，这表明将小麦秸秆转化为HC，然后用TiO(B)对其表面进行功能化处理形成复合材料，为该废弃物作为废水处理吸附剂增加了价值。
