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Morphology controlled facile synthesis of MnO2 adsorbents for rapid strontium removal
Umar Asim,Syed M. Husnain,Naseem Abbas,Faisal Shahzad,Abdul Rehman Khan,Tahir Ali 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
MnO2 nanostructures with three distinct architectures, namelyflower, balk and tube-like, have beensynthesized through a single step microwave assisted hydrothermal method at different reactiontemperatures (110 C, 140 C and 180 C). The characterization of as prepared MnO2 samples wereperformed by means of Fourier transform infrared spectroscopy, X-ray diffraction, scanning electronmicroscopy, and transmission electron microscopy. The N2 adsorption–desorption isotherms revealedthe higher specific surface area and porosity of theflower like MnO2 as compared to balk and tube-likeMnO2. The adsorption behavior of as prepared adsorbents was investigated towards Sr2+ radionuclide. Because of the hierarchal structure and the high surface area (62.64 m2/g), MnO2-110 depicted the bestSr2+ adsorption performance with maximum adsorption capacity of 52 mg/g at pH 6 as compared to otherMnO2 morphologies synthesized at 140 C and 180 C. The kinetic studies revealed that the adsorption ofSr2+ onto MnO2-110 followed the pseudo-first-order model whereas the adsorption equilibrium dataobeyed the Freundlich and Sips model. Moreover, the MnO2-110 adsorbent reached the steady statequickly ( 10 min) and is capable to bind Sr2+ in slightly acidic to alkaline solutions.
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Zhang Yu,Muhammad Umer Quddoos,Syed Abdul Rehman Khan,Muhammad Munir Ahmad,Laeeq Razzak Janjua,Muhammad Sajid Amin,Abdul Haseeb 한국외국어대학교 국제지역연구센터 2023 International Area Studies Review Vol.26 No.2
This study investigates the moderating role of the corruption index with the impacts of foreign direct investment (FDI), unemployment, corruption, and crime rate on economic growth in Bangladesh from 1988 to 2019. The Augmented Dicky-Fuller (ADF) and Phillips-Peron (P-P) unit root tests were applied to check the stationary properties of the concerned variables. The auto regressor distribution lags approach is used to test the hypotheses. The results show that the corruption index as a moderator has a significant adverse impact on economic growth along with the other variables crime, and unemployment on economic growth. To put it simply, economic growth increases by decreasing corruption, unemployment, and crime rates. Similarly, FDI and trade openness appears as a catalyst for boosting economic growth, but the interaction variable of the trade and corruption index increases the trade costs that may slow down the economic growth. As among the pioneer attempts, the present study contributes to growing literature on the moderator role of the corruption index along with other determinants of economic growth by identifying the role of FDI inflows, trade, unemployment, and crime rates on economic growth in Bangladesh. These empirical findings are directed toward some critical policy implications that will help the governmental bodies and policymakers to achieve sustainable economic growth along with ensuring better employment opportunities and thereby control the crime and corruption rates in Bangladesh.
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