Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 759, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.144317
Keywords
Solar-driven interfacial evaporation; Metal ion adsorption; Wood; Wastewater treatment
Categories
Funding
- Specialized Research Fund for Sanjin Scholars Programof Shanxi Province, China
- Programfor the Innovative Talents of Higher Education Institutions of Shanxi, China
- Key Research and Development Plan (International Cooperation) of Shanxi Province, China [201903D421082, 201803D421091]
- Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi (TSTAP), China
- Graduate Education Innovation Program of Shanxi Province, China [2019SY428]
- National Natural Science Foundation of China, China [U1510125, 51502270, 21703209]
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The study introduces a novel approach to enhance the adsorption activity of specific metal ions in wastewater through solar-driven interfacial water evaporation. By using chemically-treated carbonized wood as the adsorption system, it shows higher adsorption performance at higher solar intensity, potentially applicable in wastewater treatment.
Once the adsorbent is selected, almost introducing larger specific surface area and more surface functional groups becomes the only way to improve its adsorption performance. However, this approach is generally limited in practical application for intricate and costly engineering steps. Herein, we provided a novel avenue for boosting adsorption activities towards specific metal ions in wastewater. Solar-driven interfacial water evaporation produces the localized temperature field and concentration gradient of metal ions inside small pores, endowing with a new sorption mechanism. By using chemically-treated carbonized wood as all-in-one solar absorption and metal ion adsorption system, we achieved higher water evaporation rate and heavy metal ion removal efficiency than carbonization-only wood reported previously. In particular, this system exhibited a strong dependence of specific metal ion adsorption capacity on solar intensity. Pb2+ adsorption capacity was enhanced by over 225% with the solar intensity increased to 3.0 kW.m(-2). This could originate from the formed temperature field localized specially on the surface of adsorbents that not only induces Pb2+ concentration gradient near to solid-liquid interface but also activate inactive adsorption sites. Besides, the chemical-treated & carbonized wood showed excellent cyclic stability and can be directly utilized forwastewater treatment, recovery and reuse. (C) 2020 Elsevier B.V. All rights reserved.
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