University of Wah

About: University of Wah is a education organization based out in Rawalpindi, Pakistan. It is known for research contribution in the topics: Per capita income & Rhizobacteria. The organization has 258 authors who have published 466 publications receiving 4719 citations.

Facile synthesis of silver nanoparticles in a crosslinked polymeric system by in situ reduction method for catalytic reduction of 4-nitroaniline.

Abstract: In this study, poly(N-isopropylmethacrylamide-co-methacrylic acid) microgels prepared by free radical precipitation polymerization were used as micro-reactors for the synthesis and stabilization of silver nanoparticles. UV-Visible spectroscopy, Transmission Electron Microscopy and Fourier-transform infrared spectroscopy were used to characterize both pure and hybrid microgels. The catalytic reduction of 4-nitroaniline was carried out in the presence of hybrid microgels to test their catalytic activity, and the catalysis mechanism was explored by varying the concentrations of reacting species like 4-nitroaniline and NaBH4, as well as the dose of the catalyst. The kinetic data indicates that this reaction follows pseudo-first order. The variation in apparent rate constant (kapp) with respect to NaBH4 concentration also discloses it to be the following Langmuir-Hinshelwood mechanism. The relationship between catalyst concentration and apparent rate constant was found to be increasing in a linear manner. The data obtained also confirmed that silver nanoparticles loaded microgels have the potential to be used as an excellent micro-reactor for selective reduction of 4-nitroaniline to p-phenylenediamine.

Dynamic linkages between tourism, energy, environment, and economic growth: evidence from top 10 tourism-induced countries.

Abstract: The importance of sustainable tourism in environmental literature is well documented, while there is a need to explore its different socio-economic and environmental factors that are helpful to promote sustainable development across countries. The objective of the study is to investigate the relationship between international tourism (ITOUR), energy demand (ED), carbon dioxide emissions (CO2), and economic growth (EG) by using a panel data of top 10 tourism-induced countries for the period of 1995-2016. The findings confirmed the Environmental Kuznets Curve (EKC) hypothesis in the panel of top 10 countries. Moreover, the results show that FDI inflows negatively influenced natural environment in the form of high mass carbon emissions, which supported "pollution haven hypothesis (PHH)." The energy demand escalates carbon emissions across countries. The study confirmed the feedback relationship between (i) tourism income (TI) and ED, and (ii) CO2 emissions and international tourism departures (ITD), while study supported the growth-led tourism income across countries. The study concludes that government(s) should have to focus on ecotourism policies and energy resources in a way to mitigate carbon emissions that is imperative for sustainable development across countries.