33 research outputs found
CuâFe Incorporated Graphene-Oxide Nanocomposite as Highly Efficient Catalyst in the Degradation of Dichlorodiphenyltrichloroethane (DDT) from Aqueous Solution
Fe/graphene oxide and CuâFe/graphene oxide nanocomposite were synthesized by the atomic implantation method to study the photocatalytic degradation of dichlorodiphenyltrichloroethane (DDT). The synthesized nanocomposites were characterized by the XRD, N2 isotherms, SEM with EDX, TEM and XPS analysis. Characterization results have reported that oxides of Cu and Fe were uniformly distributed on graphene oxide and exited in the form of Cu+ and Fe2+ ions in CuâFe/graphene oxide nanocomposite. The high photocatalytic DDT removal efficiency 99.7% was obtained for CuâFe/graphene oxide under the optimal condition of 0.2 g/L catalyst, 15 mg/L H2O2 and pHâ5. It was attributed to the reduction of Fe3+ to Fe2+ by Cu+ ions and âOH radicals formation. However, it was dropped to 90.4% in the recycling study by leaching of iron and without a change in phase structure and morphology
LiDAR-based reference aboveground biomass maps for tropical forests of South Asia and Central Africa
Accurate mapping and monitoring of tropical forests aboveground biomass (AGB) is crucial to design effective carbon emission reduction strategies and improving our understanding of Earthâs carbon cycle. However, existing large-scale maps of tropical forest AGB generated through combinations of Earth Observation (EO) and forest inventory data show markedly divergent estimates, even after accounting for reported uncertainties. To address this, a network of high-quality reference data is needed to calibrate and validate mapping algorithms. This study aims to generate reference AGB datasets using field inventory plots and airborne LiDAR data for eight sites in Central Africa and five sites in South Asia, two regions largely underrepresented in global reference AGB datasets. The study provides access to these reference AGB maps, including uncertainty maps, at 100âm and 40âm spatial resolutions covering a total LiDAR footprint of 1,11,650âha [ranging from 150 to 40,000âha at site level]. These maps serve as calibration/validation datasets to improve the accuracy and reliability of AGB mapping for current and upcoming EO missions (viz., GEDI, BIOMASS, and NISAR)
Abdominal pseudocyst secondary to ventriculoperitoneal shunt along with left staghorn renal calculus management: A rare case report
Abdominal cerebrospinal fluid pseudocyst is an unusual and important complication in patients with ventriculoperitoneal (VP) shunt. Abdominal pseudocyst secondary to long-term (23 years) VP shunt is a rare complication, and associated staghorn calculus presentation is not yet reported in the literature. Herein, we present our management of abdominal pseudocyst with left staghorn calculus removal at the same sitting