Selective adsorption of indium ions on polyacrylamido-2-methylpropane sulfonic acid-grafted-natural rubber

The adsorption characteristics for In3+ ions and a standard binary mix of In3+/Fe3+ ions on polyacrylamido-2- methylpropane sulfonic acid-g-natural rubber (PAMPS-g-NR) and its vulcanized form were investigated. The adsorption capacity for In3+ was investigated by the batch immersion method. The following parameters were investigated in this study: pH, initial metal concentration, temperature, and regeneration. The adsorption data were fitted with the Freundlich isotherm. Thermodynamic parameters, including Gibbs free energy, enthalpy, and entropy indicate that In3+ adsorption onto grafted NR is a feasible, spontaneous, and exothermic process in the temperature range 303-313 K. Separation of metal ions from a binary solution based on ionic radius using vulcanized grafted NR was also investigated. The influences of method of vulcanization, solution temperature and electron dose were studied on adsorption separation efficiency for metal ion mixtures. It was found that the vulcanized rubber can act as a selective adsorbent

Benchmarking the scientific output of industrial wastewater research in Arab world by utilizing bibliometric techniques

Rapid population growth, worsening of the climate, and severity of freshwater scarcity are global challenges. In Arab world countries, where water resources are becoming increasingly scarce, the recycling of industrial wastewater could improve the efficiency of freshwater use. The benchmarking of scientific output of industrial wastewater research in the Arab world is an initiative that could support in shaping up and improving future research activities. This study assesses the scientific output of industrial wastewater research in the Arab world. A total of 2032 documents related to industrial wastewater were retrieved from 152 journals indexed in the Scopus databases; this represents 3.6 % of the global research output. The h-index of the retrieved documents was 70. The total number of citations, at the time of data analysis, was 34,296 with an average citation of 16.88 per document. Egypt, with a total publications of 655 (32.2 %), was ranked the first among the Arab countries followed by Saudi Arabia 300 (14.7 %) and Tunisia 297 (14.6 %). Egypt also had the highest h-index, assumed with Saudi Arabia, the first place in collaboration with other countries. Seven hundred fifteen (35.2 %) documents with 66 countries in Arab/non-Arab country collaborations were identified. Arab researchers collaborated mostly with researchers from France 239 (11.7 %), followed by the USA 127 (6.2 %). The top active journal was Desalination 126 (6.2 %), and the most productive institution was the National Research Center, Egypt 169 (8.3 %), followed by the King Abdul-Aziz University, Saudi Arabia 75 (3.7 %). Environmental Science was the most prevalent field of interest 930 (45.8 %). Despite the promising indicators, there is a need to close the gap in research between the Arab world and the other nations. Optimizing the investments and developing regional experiences are key factors to promote the scientific research

A study of preparation of light colored photosensitive liquid natural rubber

LE MANS-BU Sciences (721812109) / SudocSudocFranceThailandFRT