http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Tahir, Khurram,Miran, Waheed,Nawaz, Mohsin,Jang, Jiseon,Shahzad, Asif,Moztahida, Mokrema,Kim, Bolam,Azam, Mudassar,Jeong, Sang Eun,Jeon, Che Ok,Lim, Seong-Rin,Lee, Dae Sung Elsevier BV 2019 Science of the Total Environment Vol.688 No.-
<P><B>Abstract</B></P> <P>Anode potential is a critical factor in the biodegradation of organics in bioelectrochemical systems (BESs), but research on these systems with complex recalcitrant co-substrates at set anode potentials is scarce. In this study, carbamazepine (CBZ) biodegradation in a BES was examined over a wide range of set anode potentials (−200 to +600 mV vs Ag/AgCl). Current generation and current densities were improved with the increase in positive anode potentials. However, at a negative potential (−200 mV), current generation was higher as compared to that for +000 and +200 mV. The highest CBZ degradation (84%) and TOC removal efficiency (70%) were achieved at +400 mV. At +600 mV, a decrease in CBZ degradation was observed, which can be attributed to a low number of active bacteria and a poor ability to adapt to high voltage. This study signified that BESs operated at optimum anode potentials could be used for enhancing the biodegradation of complex and recalcitrant contaminants in the environment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LSV analysis showed anode potential enhanced the microbial colonization in BES. </LI> <LI> High potential favored BES, but after +400 mV, BES performance declined. </LI> <LI> CBZ biodegradation and TOC removal were enhanced in BES aided by anodic potential. </LI> <LI> Microbes with high tendency to degrade CBZ were enriched by a controlled potential. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Analysing the Causes of Design Generated Waste through System Dynamics
Sidra Muzaffar,Khurram Iqbal Ahmad Khan,Muhammad Bilal Tahir,Hamna Bukhari 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
A drastic rise in construction waste observed has elicited a radical impact on the environment and economy of the world. It is, therefore, necessary to come up with waste minimization management strategies that reflect in-depth review of sources of waste. This in depth review demands understanding the intricacy of causative factors triggering generation of “waste at source” which is the main motive of study and is done through System Dynamics for design phase in context of developing countries. 8 most important causative factors in design phase were shortlisted along with their interrelationships via literature and questionnaire survey. Followed by system thinking approach that addressed the complexities caused by those factors in 2 stages. Firstly, a Causal loop diagram was developed that illustated interrelationship between factors in the form of loops. Later SD model built, evaluated the combinatorial effect of 3 evolved stocks over the fourth stock Design Generated Waste-an emanating phenomenon. Simulation result revealed increasing trend of the stock DGW over a course of time. Therefore, increase in effect of complexities of behavior of design waste causes, will consequently lead to increase in DGW. Managing the complex behavior of these design causes will help control over the DGW w.r.t. time.
Shahzad, Asif,Nawaz, Mohsin,Moztahida, Mokrema,Jang, Jiseon,Tahir, Khurram,Kim, Jiho,Lim, Youngsu,Vassiliadis, Vassilios S.,Woo, Seung Han,Lee, Dae Sung Elsevier 2019 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.368 No.-
<P><B>Abstract</B></P> <P>Two-dimensional (2-D) titanium carbide MXene core (Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB>) shell aerogel spheres (MX-SA) for mercuric ion removal were designed and fabricated with varying concentrations of Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene and sodium alginate (SA) using a facile method. Owing to their unique inside structures, high porosities, large specific surface areas, oxygenated functional groups of MXene nanosheets, and available active binding sites, the synthesized microspheres constitute a unique adsorbent for heavy metals removal in water. The MX-SA<SUB>4:20</SUB> spheres exhibit an exceptional adsorption capacity of 932.84 mg/g for Hg<SUP>2+</SUP>, which is among the highest value reported for adsorbents. The adsorbent exhibits high single- and multi-component removal efficiencies, with 100% efficiency for Hg<SUP>2+</SUP> and >90% efficiency for five heavy metal ions. The synthesized materials are highly efficient for Hg<SUP>2+</SUP> removal under extreme pH conditions (0.5–1.0 M HNO<SUB>3</SUB>) and have additional excellent reproducible properties. The micro-size and spherical shape of MX-SA<SUB>4:20</SUB> also allow it to be used in column-packed devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> nanosheets were synthesized using a low-toxicity etching agent (NH<SUB>4</SUB>F). </LI> <LI> Core-shell of MX-SA<SUB>4:20</SUB> spheres was capable of very effectively removing heavy metals. </LI> <LI> MX-SA<SUB>4:20</SUB> spheres exhibited exceptional Hg<SUP>2+</SUP> adsorption capacity of 932.84 mg g<SUP>−1</SUP>. </LI> <LI> MX-SA<SUB>4:20</SUB> performed excellently in extreme acidic conditions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Fabrication of MX-SA<SUB>4:20</SUB> spheres through MXene-Alginate networking and their application in Hg<SUP>2+</SUP> uptake.</P> <P>[DISPLAY OMISSION]</P>