PENGARUH PERBANDINGAN MASSA Ca:P TERHADAP SINTESIS HIDROKSIAPATIT TULANG SAPI DENGAN METODE KERING

Penelitian ini bertujuan untuk mengetahui pengaruh perbandingan massa Ca:P dan temperatur kalsinasi terhadap sintesis biokeramik hidroksiapatit, Ca10(PO4)6(OH)2, dari tulang sapi. Kalsium dan fosfor dalam tulang sapi digunakan sebagai unsur utama pembentuk hidroksiapatit. Sintesis hidroksiapatit dilakukan melalui metode kering, yaitu reaksi antara padatan dengan padatan. Dalam penelitian ini digunakan bahan baku tulang sapi yang telah diabukan dan (NH4)2PO4 sebagai sumber fosfor. Abu tulang sapi dan (NH4)2PO4 dengan variasi perbandingan massa Ca:P sebesar 1:0,065; 1:0,038; dan 1:0,032 diaduk menggunakan magnetic stirrer selama tiga jam. Campuran tersebut dipanaskan dalam furnace selama dua jam pada temperatur 1000 oC. Hasil penelitian menunjukkan bahwa hidroksiapatit yang optimal diperoleh pada perbandingan massa Ca:P sebesar 1:0,065. Hasil karakterisasi dengan XRF menunjukkan bahwa kadar fosfor dalam hidroksiapatit meningkat dari kadar fosfor dalam abu tulang sapi sebesar 0,31%, sedangkan kadar kalsium dalam hidroksiapatit menurun dari kadar kalsium dalam abu tulang sapi sebesar 3,6%. Karakterisasi menggunakan FTIR menunjukkan pita serapan gugus PO43-, gugus OH- bending, dan karbonat. Kata kunci: biomaterial, hidroksiapatit, metode kering, tulang sapi

Student Response in Using Smartphone-Assisted Augmented Reality Video in Learning

Smartphone-assisted video augmented reality was developed to facilitate students who want to study anywhere, and anytime. The material studied includes the presentation of information about the work procedures of a concept being practiced. This study aims to develop a prototype for Chemistry Learning Using Video Program-Based Augmented Reality Applications and to get student responses about the use of augmented reality videos practiced in chemistry learning. This study uses a research and development approach based on the ADDIE method which has five steps, namely: analysis, design, development, implementation, and evaluation. The activity was preceded by developing a video program and being validated by a media expert, followed by making markers and developing applications. The results of the development were tried 39 students, as well as 4 teachers. The data were obtained through a questionnaire and were analyzed by descriptive qualitative. The results showed that the Prototype Development for Chemistry Learning Using Video Program-Based Augmented Reality Applications has been developed. Students responded stated that Augmented Reality (AR) video shows were able to build an understanding of teaching materials (92.3%), provide an initial understanding before working in the laboratory (95.9%), introduce the object of the experiment to be carried out (100%), explain the procedure for using the tool easily (100%)

Portrait of Chemistry Teachers\u27 Readiness in Implementing the Independent Curriculum in High Schools

This research aims to describe portrait of chemistry teachers\u27 readiness to implement the Independent Curriculum in high schools throughout South Tangerang City. The Independent Curriculum aims to increase the relevance and quality of education in Indonesia. The research was conducted using a quantitative approach with descriptive data analysis.  This research was conducted in South Tangerang City involving 56 chemistry teachers at high schools in South Tangerang City. The type of data used in this research is primary data. The instrument used to collect data in this research was a list of questions in the form of a questionnaire. The results of the research show that chemistry teachers in South Tangerang City are relatively ready to implement the independent curriculum in the schools where they teach. Researchers looked at the level of teacher readiness in implementing the independent curriculum from their knowledge regarding the characteristics and structure of the independent curriculum, readiness in planning learning, readiness in implementing learning, and readiness in implementing learning assessments. This research provides insight into the development of educational policies and the development of teacher professionalism in facing the challenges of the new curriculum

Analisis Berpikir Kritis Mahasiswa Mata Kuliah Kimia Dasar Materi Ikatan Kimia

This study aims to analyze the chritical thinking skill of university students. The sample of this study was 16 (sixteen) people taken by purposive sampling method. The study was took in Basic Chemistry class and the topic was chemical bonding. The reasearch method was qualitative descriptive reasearch. The instruments developed were test instrument and interview. The test instrument consists of four dimension such as interpretation, analysis, evaluation, and inferension. The result of this study prove that the chritical thinking skill of university students were moderate and the average percentage was 66,0625 The value of each dimensions were 62,75% for interpretation, 55,25% for analysis, 68,75% for evaluation, and the last was 77,5% for inferension.Tujuan dari penelitian ini adalah menganalisis keterampilan berfikir kritis mahasiswa. Subjek penelitian adalah mahasiswa yang berjumlah 16  (enam belas) orang yang diambil secara purposive sampling. Penelitian dilakukan pada mata kuliah Kimia Dasar materi ikatan kimia. Penelitian yang dilakukan merupakan penelitian kualitatif deskriptif dengan metode pengambilan data menggunakan soal ujian dan pedoman wawancara kepada mahasiswa. Pada instrumen soal ujian, menggunakan kemampuan berpikir tinggi dengan 4 (empat) indikator yakni interpretasi, analisis, evaluasi, dan inferensi. Setelah dilakukan analisis hasil penelitian, diperoleh hasil bahwa keterampilan berpikir kritis mahasiswa tergolong sedang dengan presentase 66,0625%. Data hasil penelitian menunjukkan keterampilan berpikir kritis mahasiswa pada interpretasi adalah 62,75%, aspek analisis adalah 55,25%, aspek evaluasi adalah 68,75%, dan aspek inferensi adalah 77,5%

Adsorption of Lubricant Waste by Porous Materials: A Review

The rapid development of technology today cannot be separated from the role of various kinds of machines to produce or increase the use value of an item. The more the engine operates, the more lubricant is used. Lubricants are included in the category of B3 waste (Toxic Hazardous Materials) so that they have a negative impact on the environment. Nearly 50% of all mineral lubricants enter the environment and cause irreparable environmental damage due to direct contact with water and soil. One of the efforts that can be done to reduce the B3 content in used lubricants is adsorption using a porous adsorbent. This study aims to see the relationship between the physical and chemical properties of the adsorbent with the physical and chemical properties of the adsorbate. This research was conducted by studying the literature of scientific articles with related topics. The results showed that some contaminants such as organic compounds, inorganic species, soot, hydrocarbons, and ash can be adsorbed with various adsorbents, namely modified sawdust, bentonite, fly ash, activated carbon, activated alumina, and zeolite Y derived from kaolin