TiO2/Kaolin composite as low-cost adsorbent for procion red removal from aqueous solution: kinetics, equilibrium, and thermodynamic studies

ABSTRACT. Procion red is one of the most utilized textile dyes by numerous textile factories worldwide. Unfortunately, it has a detrimental effect on the ecosystem whenever it was released into the environment as textile wastewater. In this work, the removal of procion red from aqueous solution has been conducted by adsorption with modified natural kaolin as a low-cost adsorbent. Kaolin was systematically modified by thermal activation then followed by acid activation in different acid concentration. Activated kaolin sample was then mixed with TiO2 to produce TiO2/Kaolin composite. Activated kaolin and TiO2/Kaolin composite were characterized using X-ray diffraction (XRD) and Fourier transform infrared (FT-IR). Various operational variables that affect the adsorption process were taken into consideration, including the effect of initial pH, contact time, initial dye concentration, and temperature. The adsorption parameters of kinetics, isotherm, and thermodynamics were also studied according to the most common model established. The results showed that the procion red adsorption was pH-dependent and reached equilibrium at 90 min. The kinetics study was revealed that the adsorption process was better demonstrated by the pseudo-first-order rather than the pseudo-second-order model. The adsorption isotherm investigation showed that the adsorption process was followed both Langmuir and Freundlich model with qe reached 158 mg/g, and the adsorption process was predicted in favorable condition. The thermodynamic study revealed that the adsorption process is spontaneous with endothermic nature. According to the results, it can be considered that the TiO2/Kaolin composite adsorbent has better adsorption capability to the procion red.               KEY WORDS: Activated kaolin, TiO2, Composite, Adsorption, Procion red Bull. Chem. Soc. Ethiop. 2019, 33(3), 437-450.DOI: https://dx.doi.org/10.4314/bcse.v33i3.

Thalassemia and Venous Thromboembolism

Although the life expectancy of thalassemia patients has markedly improved over the last few decades, patients still suffer from many complications of this congenital disease. The presence of a high incidence of thromboembolic events, mainly in thalassemia intermedia, has led to the identification of a hypercoagulable state in these patients. In this review, the molecular and cellular mechanisms leading to hypercoagulability in thalassemia are highlighted, with a special focus on thalassemia intermedia being the group with the highest incidence of thrombotic events as compared to other types of thalassemia. Clinical experience and available clues on optimal management are also discussed

Penerapan Metode Drills Berbasis Multimedia Untukmeningkatkanhasil Belajar Siswa pada Mata Pelajaran IPS Terpadu Kelas VIII SMPN 2 Banda Aceh

Penelitian ini tentang penerapan metode drills berbasis multimedia untukmeningkatkanhasil belajar siswa padamata pelajaran IPS Terpadu kelas VIII SMPN 2 Banda Aceh. Penelitian ini bertujuan untuk mengetahui; (1) Peningkatan hasil belajar siswa; (2) Aktivitas guru dan siswa; (3) Keterampilan guru; dan (4) Respon siswa terhadap penerapan metode drills berbasis multimedia. Subjek dalam penelitian ini adalah siswa kelas VIII-5 SMPN 2 Banda Aceh yang terdiri atas 30siswa. Pengumpulan data dilakukan dengan menggunakan tes hasil belajar siswa, lembar pengamatan aktivitas guru dan siswa, lembar pengamatan keterampilan guru dalam mengelola pembelajaran, dan angket respon siswaterhadap penerapan metode drills berbasis multimedia yang telah dilaksanakan. Analisis data menggunakan statistik deskriptif persentase. Hasil penelitian diperoleh bahwa; (1) Persentase ketuntasan individual pada siklus I yaitu63persendanpadasiklus II 80 persen. Secara klasikal, persentase ketuntasan pada siklus I yaitu 60 persendanpadasiklus II menjadi 90 persen; (2) Aktivitas guru dan siswa dikatakan meningkat dari siklus I sampai dengan siklus II; (3) Keterampilan guru pada siklus I diperoleh skor 2,45 dengan kategori sedang danpadasiklus II denganskor3,48dikategorikanbaik; (4) Respon siswa terhadap penerapanmetode drills berbasis multimedia dapat dikatakan positif.Ini terbukti bahwa siswa dapat memahami materi yang disajikan guru terhadap penerapanmetode drills berbasis multimedia

Pengaruh Budaya Organisasi Dan Motivasi Kerja Terhadap Kepuasan Kerja Dan Kinerja Perawat (Studi Pada Perawat Di Ruang Rawat Inap Pada Rumah Sakit Umum Daerah (RSUD) H. Hanafie Muara Bungo - Jambi)

Penelitian bertujuan untuk menganalisis dan menjelaskan pengaruh budaya organisasi dan motivasi kerja terhadap kepuasan kerja dan kinerja perawat. Penelitian ini termasuk penelitian explanatory research. Tehnik sampel dengan menggunakan tehnik Proportional Random Sampling (tehnik sampel proposional) besarnya ditetapkan berdasarkan rumus Slovin sebesar 74 dari 277 tenaga perawat Rumah Sakit Umum Daerah (RSUD) H. Hanafie Muara Bungo. Metode pengumpulan data menggunakan kuesioner. Analisa data menggunakan analisis jalur (Path Analisys). Hasil penelitian bahwa budaya organisasi berpengaruh tidak signifikan terhadap kepuasan kerja, budaya organisasi berpengaruh signifikan terhadap kinerja perawat, motivasi kerja berpengaruh signifikan terhadap kepuasan kerja, motivasi kerja berpengaruh signifikan terhadap kinerja perawat, dan kepuasan kerja berpengaruh tidak signifikan terhadap kinerja perawat. Kata Kunci: Budaya Organisasi, Motivasi Kerja, Kepuasan Kerja dan Kinerja Perawat. The purpose of this study to analyze and explain the influence of organizational culture and work motivation on job satisfaction and nurse performance. This research includes explanatory research. Sampling technique using proportional random sampling as determined by Slovin formula 74 of 277 nurses Regional General Hospital H. Hanafie Muara Bungo. Methods of data collection using questionnaires. Data analysis using path analysis. Research results effect the organizational culture is not significant on job satisfaction, organizational culture significant influence on nurse performance, work motivation significant effect on job satisfaction, work motivation significant influence on nurse performance, and the job satisfaction is not a significant influence on nurse performance

Burkitt's lymphoma of the colon and bronchi: three case reports

This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens

Thalassaemia Intermedia: an Update

Our understanding of the molecular and pathophysiological mechanisms underlying the disease process in patients with thalassaemia intermedia (TI) has substantially increased over the past decade. TI encompasses a wide clinical spectrum of beta-thalassaemia phenotypes. Some TI patients are asymptomatic until adult life, whereas others are symptomatic from as young as 2 years of age. A number of clinical complications commonly associated with TI are rarely seen in thalassaemia major, including extramedullary hematopoiesis, leg ulcers, gallstones, thrombosis and pulmonary hypertension. There are a number of options currently available for managing patients with TI, including transfusion therapy, iron chelation therapy, modulation of foetal haemoglobin production and haematopoietic stem cell transplantation. However, at present, there are no clear guidelines for an orchestrated optimal treatment plan