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一种新型粘土/TiO复合材料对水中四环素和双酚A的高效去除

Efficient Removal of Tetracycline and Bisphenol A from Water with a New Hybrid Clay/TiO Composite.

作者信息

Adesina Morenike O, Block Inga, Günter Christina, Unuabonah Emmanuel I, Taubert Andreas

机构信息

Institute of Chemistry, University of Potsdam, D-14476 Potsdam, Germany.

African Centre of Excellence for Water and Environment Research (ACEWATER), Redeemer's University, PMB 230 Ede, Osun State 232101, Nigeria.

出版信息

ACS Omega. 2023 Jun 5;8(24):21594-21604. doi: 10.1021/acsomega.3c00184. eCollection 2023 Jun 20.

DOI:10.1021/acsomega.3c00184
PMID:37360480
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10286278/
Abstract

New TiO hybrid composites were prepared from kaolin clay, predried and carbonized biomass, and titanium tetraisopropoxide and explored for tetracycline (TET) and bisphenol A (BPA) removal from water. Overall, the removal rate is 84% for TET and 51% for BPA. The maximum adsorption capacities () are 30 and 23 mg/g for TET and BPA, respectively. These capacities are far greater than those obtained for unmodified TiO. Increasing the ionic strength of the solution does not change the adsorption capacity of the adsorbent. pH changes only slightly change BPA adsorption, while a pH > 7 significantly reduces the adsorption of TET on the material. The Brouers-Sotolongo fractal model best describes the kinetic data for both TET and BPA adsorption, predicting that the adsorption process occurs via a complex mechanism involving various forces of attraction. Temkin and Freundlich isotherms, which best fit the equilibrium adsorption data for TET and BPA, respectively, suggest that adsorption sites are heterogeneous in nature. Overall, the composite materials are much more effective for TET removal from aqueous solution than for BPA. This phenomenon is assigned to a difference in the TET/adsorbent interactions vs the BPA/adsorbent interactions: the decisive factor appears to be favorable electrostatic interactions for TET yielding a more effective TET removal.

摘要

新型TiO杂化复合材料由高岭土、预干燥和碳化的生物质以及四异丙醇钛制备而成，并用于研究从水中去除四环素（TET）和双酚A（BPA）。总体而言，TET的去除率为84%，BPA的去除率为51%。TET和BPA的最大吸附容量（）分别为30和23 mg/g。这些容量远大于未改性TiO所获得的容量。增加溶液的离子强度不会改变吸附剂的吸附容量。pH值的变化仅略微改变BPA的吸附，而pH>7会显著降低TET在该材料上的吸附。Brouers-Sotolongo分形模型最能描述TET和BPA吸附的动力学数据，预测吸附过程通过涉及各种吸引力的复杂机制发生。Temkin等温线和Freundlich等温线分别最适合TET和BPA的平衡吸附数据，表明吸附位点本质上是不均匀的。总体而言，复合材料从水溶液中去除TET比去除BPA更有效。这种现象归因于TET/吸附剂相互作用与BPA/吸附剂相互作用的差异：决定性因素似乎是TET有利的静电相互作用，从而实现更有效的TET去除。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2d8f/10286278/4ab0c563c66a/ao3c00184_0010.jpg
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