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Application of Agro-industrial Solid Waste as Biochar for Iron (II) Removal from Aqueous Solution Rusnam, Rusnam; Yanti, Nika Rahma; Puari, Aninda Tifani; Sari, Nurmala
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 1 (2024): March 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i1.155-164

Abstract

In recent years, various industrial activities have introduced a high concentration of iron in the waterbody which causes serious problem to environment. This paper proposed the application of Exhausted Coffee Husk (ECH) as the biosorbent (BS) for removing iron (Fe) (II) in the aqueous solution. The ECH was carbonized into biochar before performing biosorption of the heavy metal ion. The effect of carbonization temperature, time and rate on the performance of the ECH biochar for removing Fe (II) were evaluated. The percentage of removal efficiency (RE) and the capacity of biosorption (mg/g) were considered as the determining parameters. The pyrolysis temperature was varied in a range of 200-600 °C with 50 °C of interval, while the time was in between 1h – 3h with a n interval of 0.5 h, and the temperature gradient of 5 – 25°C/min. The results showed that the temperature had a significant effect on the properties of the ECH biochar as BS for Fe (II). The temperature of 550 °C, at 1.5 h of time and 25 °C/min was chosen as the suggested carbonization temperature of biochar from ECH for biosorption of Fe (II).  Keywords:  Agro-industrial solid waste, Biosorption,  Carbonization, Exhausted coffee husk (ECH), Heavy metal.   
Response Surface Methodology (RSM) for Optimization Carbonization Parameters of Exhausted Coffee Husk for Iron Removal from Aqueous Solution Puari, Aninda T.; Yanti, Nika R.; Sari, Nurmala; Rusnam, Rusnam
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 13 No. 3 (2024): September 2024
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v13i3.637-649

Abstract

In this study, biochar derived from exhausted coffee husk (ECH) was used as biosorbent for removing Iron (II) from aqueous solution. The aim of this study was to improve the biosorption capacity of the biosorbent from agricultural solid waste and its usability for Fe²⁺ removal. The biosorption performance of ECH biochar was optimized through carbonization parameters: temperature, time, and temperature gradient. Response Surface Methodology (RSM) based on multivariate analysis was employed to evaluate the biosorption performance of ECH biochar for Fe²⁺ biosorption. The optimum performance predicted through Box-Behnken design experiment. The optimal combination of the three parameters was 549.37°C, 1.98 h and 21.98°C/min. At the optimal condition the removal efficiency (RE) was predicted to be 107.01% and biosorption capacity (qt) was 5.11 mg/g. SEM-EDX, FT-IR and XRD analysis were conducted in this study to evaluate the biosorption mechanism of ECH biochar on the iron ion. The results showed that ion exchange existed on the surface of the ECH biochar during the biosorption. Additionally, the presence of functional groups on the ECH biochar surface responsible for Fe(II) binding. Overall, the findings of this study suggested an eco-friendly strategy for optimizing the removal of Iron (II) from polluted water by the biosorption onto ECH biochar. Keywords: Biochar, Biosorption capacity, Box-Behnken design, Temperature, Time
Capital structure dynamics in Indonesia: Understanding the role of ROA in the relationship between firm age, size, and leverage Meilita, Willi; Suseno, Giri; Sari, Nurmala
Junal Ilmu Manajemen Vol 7 No 3 (2024): July: Management Science and Field
Publisher : Institute of Computer Science (IOCS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/jmas.v7i3.499

Abstract

This study examines the dynamics of capital structure in Indonesia by exploring the role of Return on Assets (ROA) in mediating the relationship between firm age, size, and leverage usage. Employing a quantitative approach, the research analyzes panel data from 424 non-financial companies listed on the Indonesia Stock Exchange during 2019-2021. The analysis utilizes Partial Least Squares (PLS), emphasizing that the data does not need to be normally distributed and can accommodate small sample sizes. The findings indicate that ROA acts as a negative, albeit statistically insignificant, mediator in the relationship between both firm age and size with leverage. Despite theoretical frameworks like Pecking Order and Market Timing Theories suggesting explanatory mechanisms, the study reveals that ROA’s mediation is not robust enough to substantiate these theories. Consequently, the results suggest that other factors may be more pivotal in explaining the observed relationships. This study underscores the need for further research into how firm characteristics influence capital structure, particularly in emerging markets like Indonesia. It contributes to the theoretical and practical understanding of capital structure management, providing crucial insights for investors and managers.
Uji Aktivitas Ekstrak Etanol Daun Kenikir (Cosmos caudatus Kunth.) Dengan Metode DPPH Abidin, Zainal; Aminah, Aminah; Sari, Nurmala
Makassar Pharmaceutical Science Journal (MPSJ) Vol 2 No 3 (2024)
Publisher : PHARMACY UMI JOURNAL SYSTEM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/mpsj.v2i3.297

Abstract

Kenikir (Cosmos caudatus Kunth.) is a traditional vegetable that can be eaten raw or cooked as a vegetable. This plant is also used for food flavoring and traditional medicine. In addition, several nutritional and medical studies show that Kenikir is rich in bioactive compounds such as flavonoids, phenols, carbohydrates, minerals, proteins and vitamins, which can increase its nutritional value. This study aims to determine the antioxidant activity of ethanol extract of kenikir leaves (Cosmos caudatus Kunth) using the DPPH method. The results showed that the ethanol extract of kenikir leaves (C. caudatus Kunth) had high antioxidant activity. Antioxidants are substances that can delay, slow down and prevent oxidation. Antioxidants are very beneficial for health and play an important role in maintaining the quality of food products. The antioxidant activity is in the very strong category (<50 ppm), namely 25,212 ppm. The macerated extract showed the highest antioxidant activity because it contained many secondary metabolites such as flavonoids and phenolics.
View of an evaluation framework for legal entity state universities in indonesia: integration and measuring institusional effectiveness Rosmiati, Rosmiati; Iwan Putra; Dwijayanti, Novia Sri; Sari, Nurmala; Nasori, Ahmad
Jurnal Konseling dan Pendidikan Vol. 13 No. 1 (2025): JKP
Publisher : Indonesian Institute for Counseling, Education and Therapy (IICET)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29210/1148600

Abstract

This research is motivated by the turbulent development of economic improvement in the world of education regarding Legal Entity State Universities in Indonesia, which integration measuring institutional effectivenes, and evaluation framework which are needed in the tertiary environment. Therefore, it is necessary to design concepts, models of good practice, and implementation in Legal Entity State Universities in Indonesia. The method used is a qualitative method using text-based analysis, which is called textual analysis of various reports, official documents, guidelines, and procedures. This research aims to examine and analyze how legal entity state universities influence the integration of institutional effectiveness and Institutional theory-based research as a form of assessment of existing models and regulations. The results showed that the shift in the institutional form of Legal Entity State Universities (PTNBH) has brought about changes in strategic leadership models such as in private organizational governance. The analysis result found that dominant evaluation framework model legal entity state universities is the main idea, the main model in providing recommendations for good management development and preparation for handling problems with legal entity state universities in Indonesia which have not yet been implemented Researchers in this field and in Indonesia in general. The findings show that the evaluation framework model in legal entity state universities still have several problems including concept (4 findings), model (3 findings), process audit (2 finding), and implementation (1 findings). So it is necessary to immediately carry out harmonization and explain the formulation of several
PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE STAD TERHADAP HASIL BELAJAR BAHASA INDONESIA PADA KELAS IV SD NEGERI 064981 MEDAN HELVETIA TAHUN AJARAN 2023/2024 Putri, Qhanazsa Ananda; Siregar, Siti Rahmadhani; Sari, Nurmala; Handayani, Sevin
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 9 No. 3 (2024): Volume 09 No. 03 September 2024
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v9i3.17126

Abstract

Penelitian ini dilakukan dengan tujuan untuk menganilisis pengaruh penerapan model pembelajaran kooperatif tipe STAD terhadap hasil belajar Bahasa Indonesia siswa kelas IV SD Negeri 064981 kecamatan Medan Helvetia. Populasi pada penelitian ini adalah siswa kelas IV Sekolah Dasar Negeri 064981 yang berada di Medan dan sampel yang digunakan adalah kelas IV B. Penelitian ini menggunakan metode true-experimental dengan desain penelitian pretest-post-test Control Group Design. Instrumen yang digunakan pada penelitian ini berupa tes karangan cerita pendek yang sudah diuji validitas dan reliabilitas pada sig. 0,05. Pengumpulan data yang dipakai yaitu observasi, tes karangan cerita pendek, dokumentasi, dan wawancara. Hasil penelitian ini dari perhitungan uji distribusi t yaitu thitung (96.972) dan ttabel (1.729) menunjukkan bahwa Ha dapat diterima. Berdasarkan Kesimpulan penelitian yaitu terdapat pengaruh pada penerapan model pembelajaran kooperatif tipe STAD terhadap hasil belajar siswa pada Pelajaran Bahasa Indonesia kelas IV SD Negeri 064981 kecamatan Medan Helvetia.
Capacity Building for Islamic Boarding School Students through Health Management Training at Alam Indonesia Islamic Boarding School, Barru Regency Anggraeni, Rini; Sari, Nurmala; Hamzah, Herlina; Widaningsih, Yuyun; Salman, Nur Latifah; Bari’ah, Andi Azisah
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 8 No 2 (2025): Collaboration for Accelerated Community Achievement
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v8i2.624

Abstract

Islamic boarding schools (pesantren) often face health problems such as overcrowding, poor sanitation, and low awareness of clean and healthy living behavior (PHBS). This community service program aimed to improve students’ knowledge and skills in managing health at Pondok Pesantren Alam Indonesia, Barru Regency, through a Training of Trainer (ToT) approach. The program, conducted by the Faculty of Public Health, Hasanuddin University, involved 52 students from junior and vocational levels. Activities included lectures, group discussions, practical sessions, and knowledge tests with 40 questions. Results showed that most students achieved good (34.62%) and fair (30.77%) knowledge levels and improved healthy habits such as eating fruits and vegetables, drinking enough water, and exercising regularly. The program effectively increased students’ awareness and skills in health management and strengthened cooperation between the pesantren and the local government.
EFEKTIVITAS ASAP CAIR DARI PIROLISIS TEMPURUNG KELAPA SEBAGAI PESTISIDA ORGANIK DALAM PENGENDALIAN HAMA PADA TANAMAN HIDROPONIK DI KELURAHAN TERJUN, KECAMATAN MEDAN MARELAN Sari, Nurmala; Razali, Mariany; Sari Br Sijabat, Octanina; Hidayat Sihotang, Supran; Rizki Sembiring, Fanny; Putra Gulo, Penyabar; Yanti Laia, Fenida
Mejuajua: Jurnal Pengabdian pada Masyarakat Vol. 5 No. 2 (2025): Desember 2025
Publisher : Yayasan Penelitian dan Inovasi Sumatera (YPIS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52622/mejuajuajabdimas.v5i2.292

Abstract

Hydroponic cultivation is increasingly popular in urban areas due to its efficiency and hygiene. However, pest attacks remain a major obstacle, often addressed by the use of chemical pesticides. Long-term use of chemical pesticides negatively impacts health, and in hydroponic farming, they can leave harmful residues and negatively impact the environment. Utilizing coconut shell waste as an organic pesticide is an innovation that supports environmentally friendly agriculture. This program aims to use liquid smoke produced from the pyrolysis process of coconut shells as an organic pesticide to control pests in hydroponic plants in Terjun Village, Medan Marelan District. The activity stages are carried out using participatory and educational methods, including preparation, implementation, and evaluation. The preparation stage includes site surveys, coordination with partners, and preparation of educational materials and leaflets. During the implementation stage, socialization, demonstrations of organic pesticide application in the form of liquid smoke, and distribution of leaflets are conducted. The evaluation stage was conducted through a questionnaire test before and after the activity (pre-test and post-test) to assess the increase in participants' understanding. The final evaluation results showed an average increase in participants' knowledge of 32.6%, from a pre-test score of 62.4% to a post-test score of 95.0%. The highest increase occurred in the understanding of liquid smoke and its functions by (+ 43%), followed by an increase in the aspect of knowledge about organic pesticides by (+ 40%) and interest in using liquid smoke by (+ 35%).
Peningkatkan Kesadaran Remaja Putri tentang Anemia dengan Buku Saku sebagai Media Penyuluhan Sari, Nurmala; Nisya , Aulia Aradia; Saputri , Fadlina; Olivia , Namirah Nur; Sholeha, Siti Khoirunnisa As; Jabarisutan, Rury Anlifedika; Sudarman, Muh Fitrah Nurjaya
Jurnal Mandala Pengabdian Masyarakat Vol. 6 No. 2 (2025): Jurnal Mandala Pengabdian Masyarakat
Publisher : Progran Studi Farmasi Universitas Mandala Waluya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35311/jmpm.v6i2.551

Abstract

Anemia pada remaja merupakan masalah kesehatan yang masih menjadi perhatian pemerintah. Berdasarkan Survei Kesehatan Indonesia 2023, prevalensi anemia pada remaja putri (15-24 tahun) adalah 18%. Tujuan dari kegiatan ini untuk meningkatkan pengetahuan remaja putri dalam mengatasi kejadian anemia. Metode Intervensi penyuluhan terkait bahaya anemia pada remaja putri dilakukan secara Focus Group Discussion menggunakan media buku saku. Hasil analisis data menunjukkan bahwa 84% responden mengalami peningkatan pengetahuan setelah diberikan materi penyuluhan. Evaluasi kegiatan dilakukan dengan pemberian pre-post test untuk mengukur pengetahuan siswa sebelum dan sesudah kegiatan. Kegiatan intervensi ini perlu mendapat perhatian dari pihak sekolah dibantu oleh puskesmas pembantu atau pos Kesehatan desa setempat untuk terus melakukan promosi kesehatan dalam rangka mencegah terjadinya anemia pada remaja putri.
Relevansi Hukum Perdata Klasik dalam Menjawab Sengketa Perjanjian Digital Masa Kini Adam, Syahrial; Sari, Nurmala; Rosidi, Ahyar
SIMPUL: Jurnal Ilmu Politik dan Hukum Vol. 1 No. 4: SIMPUL: Jurnal Ilmu Politik dan Hukum, Desember 2025
Publisher : Gema Cendekia Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71094/simpul.v1i4.317

Abstract

The development of digital technology has transformed the way agreements are formed, implemented, and disputed. Digital agreements present conceptual and practical challenges for civil law, particularly regarding validity, proof of intent, and the responsibilities of the parties. This study aims to analyze the relevance of classical civil law in addressing today's digital agreement disputes. The main focus of the study is directed at the role of classical civil law principles and constructions as a normative framework in assessing contractual relationships arising from electronic transactions. This study uses normative legal research methods with conceptual, statutory, and comparative approaches. The analysis is conducted on classical civil law principles, such as consensualism, freedom of contract, pacta sunt servanda, and good faith, and their application in the context of digital agreements, including electronic contracts, electronic signatures, smart contracts, and digital dispute resolution mechanisms. The legal materials are analyzed qualitatively through deductive and interpretive reasoning. The results of the study indicate that classical civil law remains relevant and operational in addressing digital agreement disputes. The legal requirements of classical agreements remain the main benchmark in assessing the validity of electronic contracts. The theory of will and the principle of good faith has been proven to explain and evaluate the process of forming and implementing digital agreements. Digitalization does not eliminate civil liability, but requires adjustments in the provision of evidence and the interpretation of norms. This study concludes that an integrative approach that maintains classical civil law as a normative foundation is an effective strategy for ensuring legal certainty and contractual justice in the digital era.
Co-Authors Abdul Hapid Abdul Wahid Suleman Achmad Hidir Adabi, Muhammad Ikhwan Adam, Syahrial Afifah, Ayyi Agustina, Anggi Ahmad Muhtadi Ajuan Ritonga Akmal, Junifar Alfa Syahputra Almira, Della Amanda, Sri Retno Wulandari Amar Salahuddin Amelia, Tasya Amin, Ida Ifdaliah Aminah Aminah Ananta, Dhea Andari, Ella Andica, Juita Aninda T. Puari Aprimadedi Ariescha, Putri Ayu Yessy Arini, Fitri Dwi Aristora, Irsadi Arpizal Arpizal Arsyadi, Muallif Asep Saefurohman Asnah Marzuki Asrial Aswan, Dara Mutiara Ayu Wahyuni Ayunda, Desy Sari Azzahrah, Afifah Baiq Ismiwati Bari’ah, Andi Azisah Budiana, Sandi Budiarti, Reni Sulistiyoning Bylla, Salsa Charisma Ayu Pramuditha Chatarina Umbul Wahyuni Dachi, Kanne Damanik, Mia Defna, Saniyyah Delita Sartika Destrinelli Destrinelli, Destrinelli Devra, Desi Devrika Dewi Ratna Sari Dwi Putri, Irmania Dwi Putri, Shania Dwijayanti, Novia Sri Edi Istiyono Eka Sabila, Dwi Eldine, Achyar Enda Puspitasari Eva Latifah Nurhayati Fajar Kesuma, Andika Fajri, Nur Fajrin, Dessy Hidayati Fauji, Diah Ayu Septi Febriani , Yessi Febriyanti Panjaitan Febti Kuswanti Feni Pebriani Tarigan, Dwi Fitri Andriani, Fitri Ginting, Ernawaty Gregorius, Geraldy Gulo, Putra Penyabar Gustian Djuanda H. A. E. Zainal Hasan Hadi, Idham Hadi, Milvan Halawa, Kris Angelina Halim, Didin Hamsinah Hamsinah, Hamsinah Hamzah, Herlina Handayani, Salma Handayani, Salmah Handayani, Sevin Hapsari, Novia Dwi Harahap, Muhamad Haikal Firyaldi Harlis Harlis Hasanah, Fenny Henny Fitriani, Henny Heri Retnawati Herman H, Herman Hidayat Sihotang, Supran Hijrah Amaliah Azis Husna, Fitriatul Hutabarat, Vitrilina I MADE ARTIKA ILHAM Indriana , Meutia Indriana, Meutia Jabarisutan, Rury Anlifedika Jalaluddin Jalaluddin Jhowanda, Rahmat Julianty , Siti Muliani Kalliecharan, Ricky Van Karmila, Nita Kembaren, Natasyha Pebrina Br Sembiring Khaeroni, Khaeroni Khairani, Naura Khuzaifah, Khuzaifah Krisna, Putri Kristiana, Titin Kusuma, Ariyanti Laia, Ratnasari Laili Rahmi, Laili Lamana, Aspia Larasati Wulandari, Bayu Latip Lepita, Lepita Lestari, Fitri Alia Lestari, Rohmini Indah Lili Suryani Lilis Wahyuni, Lilis Lubend, Sudarman Lubis, Salmah Handayani M Rusdi Maharani, Deswita Manao, Marcella Marjohan, Masno Maser, Wahyu Haryati Meilita, Willi Mhd. Arief Hasan, Mhd. Arief Mohammad Fauziddin Muchamad Fajri Amirul Nasrullah Muflihan, Yenni Muhammad Arif Liputo, Muhammad Arif Muhammad Guntur, Muhammad Muhammad Iqbal Muhammad Sofwan Mulya, Fitra Muniroh, Leny Muslim , Fachruddiansyah Mustam, Mariaulfa Mustari, Andi Muzakkir Muzakkir Nababan, David Nadhira, Syarifah Nadia, Syarifah Nainggolan, Aurina Nasori, Ahmad Nasywa, Dinda Natalia, Desfaur Ni Ken Ritchie, Ni Ken Nika Rahma Yanti Nisya , Aulia Aradia Novia Sri Dwijayanti Novriza, Ferdiansyah Nur Fadia, Fenti Nur ‘Azah Nurcahyati Nurrahman, Taufik Nurul Hasanah Nurul Inayah Nurul Yaqin Nurulwati, Nurulwati Nurus Shalihin, Nurus Okmarisa, Heppy Oky Nur Pratiwi Johansyah Olivia , Namirah Nur Pasaribu, Rihan Addilah Pradani, Zulfan Egi Pramika, Depi Prihandari, Ayu Puari, Aninda T. Purba, Theresia Widi Astuti Purbani, Widsyastuti Putra Gulo, Penyabar Putra, Iwan Putra, Iwan Eka Putri, Qhanazsa Ananda Qusthoniah, Qusthoniah Rahmadani, Maghfira Rahmadani, Tasya Raihan Siddik, Muhammad Ramadhan, Raihan Zaki Ramdani, Nurfika Rasimin Razali, Mariany Renea Shinta Aminda Ria Novianti Rini Anggraeni Rino Sardanto Risma Niswaty Riyana, Reny Rizki Ananda Rizki Sembiring, Fanny Rosidi, Ahyar Roslan, Syafika Rosmiati Rosmiati Rosmiati Rostikawati, R. Teti RR. Ella Evrita Hestiandari Rusnam Rusnam Sabri, Hatta Safitri, Meliya Salman Salman Salman, Nur Latifah Salsabiila , Salsabiila Salsabila Sandi, M. Saptiani, Bintang Indah Saputra, Aliffia Indira Irvine Saputri , Fadlina Sari Br Sijabat, Octanina SARI, CINDY PERMATA Sari, Intan Wulan Sari, Riska Novita Sarwani Sarwani, Sarwani Sembiring, Fanny Rizki Septia Nabila, Dwi Septiana, Riska Sholeha, Siti Khoirunnisa As Siahaan, Desi Natalia Siahaan, Ungkap Sihotang, Supran Hidayat Silvany, Rika Simamora, Antonia Yunita simanjuntak, kresensia br Simanjuntak, Labora Sinurat, Ries Ruth Rytond Siradjuddin, Mutmainnah Siregar, Siti Rahmadhani Siregar, Wilda Wahyuni Siti Hajar Siti Syuhada Sitorus, Atikah Situmorang, Mei Sony Bernike Magdalena Sitorus Sriwahyuni, Eka Suci Ramadhani, Suci Sudarman, Muh Fitrah Nurjaya Sudewi Sudewi Sudharsono, Muhammad Sunita Dasman Supramono Suseno, Giri Syamsiar, Syamsiar Tambunan, Ika Julianti Tambunan, Pravil Mistryanto Tanjung, Jessica Tarigan, Dwi Feni Pebriani Br Tenri Ayu Adri Teuku Ilhami Surya Akbar Toni Ahmad Subekti Tryaningsih , Ucy Ulya, Mila Thohirotul Utami, Adinda Mega Utomo, Widodo Budi Uyun Harahap, Qurrotul Variza Aditiya Vita Rosaline Fahri Wahyu Mulyadi Wan Fachruddin Warna, Eka Waruwu, Nofirman Yantoni Widaningsih, Yuyun Widayanti, Satri Widyastuti Purbani Wulandari, Bayu Larasati Wulansari Prasetyaningtyas, Wulansari Yanti Laia, Fenida Yanti, Dinda Yanti, Nika R. Yoserizal " Yuli Budiati Yusnidar Yusnidar Zahwa, Putri Naysila Zainal Abidin Zulisa, Zulisa