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- MakaleAçık Erişim2026Mercury Removal from Glycine Leach Solutions Using Sodium Sulfide (Na2S) Precipitation
Kantarci, Sadiye; Alp, Ibrahim; Youpoungam, Abdou Azizi; Sivircik, Salih
Amino acid leaching has been considered an environmentally friendly alternative for gold recovery; however, the dissolution of mercury (Hg) during the leaching of amalgamation tailings remains a major challenge. This study is a novelty study that focuses on Hg removal by passing the Hg-containing tailings, previously processed by amalgamation, into solution via glycine (NH(2)CH2COOH) leaching. In this regard, a precipitation method using sodium sulfide (Na2S) was developed to remove Hg from solutions obtained after glycine leaching. The effects of precipitation time, pH, Na2S dosage, and temperature were investigated. The effects of pH, precipitation time, and temperature were found to be limited within the investigated ranges. The results showed that Na2S dosage was the most effective parameter in mercury removal. The initial Hg concentration of 12,160 ppb was reduced to 223 ppb at a Na2S:Hg molar ratio of 60, corresponding to approximately 98% removal efficiency under the selected operating conditions. Increasing the Na2S:Hg ratio to 80 resulted in a slightly higher removal efficiency (similar to 99%) with a final Hg concentration of 144 ppb; however, a ratio of 60 was considered optimal in terms of reagent consumption and process efficiency. The outcomes indicate that Hg removal with Na2S is a rapid and effective process under alkaline conditions, while Au remains in solution and Cu and Ag are partially removed, indicating limited selectivity and the need for further optimization. Therefore, this study provides a basis for developing more environmentally friendly processes for amalgamation tailings.
- MakaleAçık Erişim2019THE ROLE OF SOCIAL MEDIA IN TEACHING ARABIC TO NONARABIC SPEAKERS IN TURKISH STATE UNIVERSITIES
Qaddom, Mahmoud; Mohamed, Ali Abdelwahed Abdelhameed
Modern technology has become an auxiliary source in teaching languages and developing language basic skills: listening, speaking, reading and writing. Consequently, teachers, especially in the field of teaching Arabic to non-Arabic speakers, can not skip these technological methodsor ignore them in teaching and exercising language skills. The present research discusses the role of social media in teaching Arabic to non-Arabic speakers in Turkish public universities. Unlike previous studies which addressed the use of modern technology as a secondary consern in teaching arabic to non-native speakers, this research is one of the few studies thatbasically addresses this issue in this field. This study is dedicated to the study of the social media and its role in teaching Arabic to non-Arabic speakers in Turkish universities. It seeks to answer the following questions: What is the reality of the use of social media in teaching Arabic in Turkish universities? What is the effectiveness of the use of social media in the development of language skills among students of Turkish universities? What are the pros and cons of using social media sites in learning Arabic from the perspective of students and faculty teaching members in Turkish universities? We came into the following conclusions:All means of social media with all available channels contribute directly to the teaching of the Arabic language skills as well as overcoming a lot of mistakes committed by both teachers and learners of non-Arabic speakers.
- DergiHITTITE JOURNAL OF SCIENCE AND ENGINEERING
- DergiHITIT UNIVERSITESI ILAHIYAT FAKULTESI DERGISI-JOURNAL OF DIVINITY FACULTY OF HITIT UNIVERSITY