http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Designer carbon nanotubes for contaminant removal in water and wastewater: A critical review
Sarkar, Binoy,Mandal, Sanchita,Tsang, Yiu Fai,Kumar, Pawan,Kim, Ki-Hyun,Ok, Yong Sik Elsevier BV 2018 Science of the Total Environment Vol.612 No.-
<P><B>Abstract</B></P> <P>The search for effective materials for environmental cleanup is a scientific and technological issue of paramount importance. Among various materials, carbon nanotubes (CNTs) possess unique physicochemical, electrical, and mechanical properties that make them suitable for potential applications as environmental adsorbents, sensors, membranes, and catalysts. Depending on the intended application and the chemical nature of the target contaminants, CNTs can be designed through specific functionalization or modification processes. Designer CNTs can remarkably enhance contaminant removal efficiency and facilitate nanomaterial recovery and regeneration. An increasing number of CNT-based materials have been used to treat diverse organic, inorganic, and biological contaminants. These success stories demonstrate their strong potential in practical applications, including wastewater purification and desalination. However, CNT-based technologies have not been broadly accepted for commercial use due to their prohibitive cost and the complex interactions of CNTs with other abiotic and biotic environmental components. This paper presents a critical review of the existing literature on the interaction of various contaminants with CNTs in water and soil environments. The preparation methods of various designer CNTs (surface functionalized and/or modified) and the functional relationships between their physicochemical characteristics and environmental uses are discussed. This review will also help to identify the research gaps that must be addressed for enhancing the commercial acceptance of CNTs in the environmental remediation industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CNTs can be designed through specific functionalization or modification process. </LI> <LI> Designer CNTs can enhance contaminant removal efficiency. </LI> <LI> CNTs can facilitate recovery and regeneration of nanomaterials. </LI> <LI> CNTs hold potential applications in wastewater purification and desalination. </LI> <LI> Further research is needed to enhance commercial acceptance of CNTs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Mandal, Sanchita,Sarkar, Binoy,Igalavithana, Avanthi Deshani,Ok, Yong Sik,Yang, Xiao,Lombi, Enzo,Bolan, Nanthi Elsevier Applied Science 2017 Bioresource technology Vol.246 No.-
<P><B>Abstract</B></P> <P>Objective of this study was to investigate the mechanisms of 2,4-Dichlorophynoxy acetic acid (2,4-D) sorption on biochar in aqueous solutions. Sorption isotherm, kinetics, and desorption experiments were performed to identify the role of biochars’ feedstock and production conditions on 2,4-D sorption. Biochars were prepared from various green wastes (tea, burcucumber, and hardwood) at two pyrolytic temperatures (400 and 700°C). The tea waste biochar produced at 700°C was further activated with steam under a controlled flow. The sorption of 2,4-D was strongly dependent on the biochar properties such as specific surface area, surface functional groups, and microporosity. The steam activated biochar produced from tea waste showed the highest (58.8mgg<SUP>−1</SUP>) 2,4-D sorption capacity, which was attributed to the high specific surface area (576m<SUP>2</SUP> g<SUP>−1</SUP>). The mechanism of 2,4-D removal from aqueous solution by biochar is mainly attributed to the formation of heterogeneous sorption sites due to the steam activation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Steam activated tea waste biochar sorbed the highest amount of 2,4-D. </LI> <LI> Steam activation increased biochar surface area and conserved oxygen-containing functional groups. </LI> <LI> 2,4-D desorption was lowest in steam activated biochar. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
El-Naggar, Ali,El-Naggar, Ahmed Hamdy,Shaheen, Sabry M.,Sarkar, Binoy,Chang, Scott X.,Tsang, Daniel C.W.,Rinklebe, Jö,rg,Ok, Yong Sik Academic Press 2019 Journal of Environmental Management Vol. No.
<P><B>Abstract</B></P> <P>Biochar application has multiple benefits for soil fertility improvement and climate change mitigation. Biochar can act as a source of nutrients and sequester carbon (C) in the soil. The nutrient release capacity of biochar once applied to the soil varies with the composition of the biochar, which is a function of the feedstock type and pyrolysis condition used for biochar production. Biochar has a crucial influence on soil C mineralization, including its positive or negative priming of microorganisms involved in soil C cycling. However, in various cases, biochar application to the soil may cause negative effects in the soil and the wider environment. For instance, biochar may suppress soil nutrient availability and crop productivity due to the reduction in plant nutrient uptake or reduction in soil C mineralization. Biochar application may also negatively affect environmental quality and human health because of harmful compounds such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated dibenzodioxins, and dibenzofurans (PCDD/DF). In this review, we discuss the linkage between biochar composition and function, evaluate the role biochar plays in soil fertility improvement and C sequestration, and discuss regulations and concerns regarding biochar's negative environmental impact. We also summarize advancements in biochar production technologies and discuss future challenges and priorities in biochar research.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nutrient contents in biochar highly dependent on the feedstock type. </LI> <LI> Pyrolysis temperature alters the proportion of aromatic and aliphatic C fractions. </LI> <LI> Chemical and physical properties of biochar affect the nutrient release from biochar. </LI> <LI> Application of unsuitable biochar can negatively affect environmental quality and human health. </LI> <LI> Biochar can be a potential source of polycyclic aromatic hydrocarbons and polychlorinated dibenzodioxins. </LI> </UL> </P>