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All Journal Community Engagement and Emergence Journal (CEEJ) Equilibrium Journal of Chemical Engineering
Sari, Erica Puspita
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Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology

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Peran Motivasi Kerja Dalam Hubungan Antara Disiplin Kerja dan Efikasi Diri Terhadap Kinerja Karyawan Perusahaan Kontruksi Sari, Erica Puspita; Farid Wajdi
Community Engagement and Emergence Journal (CEEJ) Vol. 6 No. 6 (2025): Community Engagement & Emergence Journal (CEEJ)
Publisher : Yayasan Riset dan Pengembangan Intelektual

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37385/ceej.v6i6.9686

Abstract

Studi ini menelaah bagaimana motivasi kerja berperan dalam menjelaskan keterkaitan antara disiplin kerja serta efikasi diri terhadap pencapaian kinerja karyawan pada sektor konstruksi. Motivasi diposisikan sebagai rangsangan psikologis baik yang berasal dari dalam diri maupun lingkungan kerja yang dapat membentuk tingkat komitmen dan intensitas usaha individu dalam memenuhi target organisasi. Disiplin kerja direpresentasikan melalui konsistensi dalam mematuhi prosedur, ketepatan hadir maupun menyelesaikan tugas, serta hasil kerja yang sesuai standar. Sementara itu, efikasi diri dipahami sebagai keyakinan personal mengenai kemampuan menyelesaikan pekerjaan secara efektif. Pengumpulan data dilakukan menggunakan instrumen kuesioner dengan skala Likert 1–5 dan dianalisis melalui pendekatan PLS-SEM menggunakan software SMARTPLS, meliputi pengujian Outer Model, evaluasi multikolinearitas, hingga pengujian hubungan struktural pada Inner Model. Temuan empiris menunjukkan bahwa baik disiplin kerja maupun efikasi diri mampu meningkatkan kinerja secara signifikan. Namun, motivasi kerja tidak memberikan efek mediasi yang berarti dalam hubungan tersebut. Hasil ini menegaskan bahwa peningkatan kinerja karyawan lebih efektif dicapai melalui penguatan disiplin dan keyakinan diri, sembari mengkaji elemen lain seperti kompetensi, dukungan organisasi, dan kondisi kerja yang turut memengaruhi performa.
Regeneration of Spent Nickel Catalyst via Hydrometallurgical Method Amelia, Fransisca Poppy; Sari, Erica Puspita; Norman, Hafiz; Salsabil, Muhammad Alhadilansa; Yudha, Cornelius Satria
Equilibrium Journal of Chemical Engineering Vol 7, No 2 (2023): Volume 7, No 2 December 2023
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v7i2.74492

Abstract

Abstract. Nickel Catalyst is one of the common catalysts found in chemical industries. However, this catalyst has a limited lifetime indicated by having performance or activity drop so it is potentially become dangerous waste if the handling is not proper. The spent nickel catalyst needs to be processed to recover and avoid pollution towards the environment. The Hydrometallurgy method is a proper method to process nickel catalyst waste. The purpose of this research is to investigate the characteristic of a regenerated nickel catalyst when it is treated with HCl and H2SO4 as the lixiviant. In this research, the spent nickel catalyst was treated with HCl and H2SO4 in the presence of 2% H2O2 reductant under room conditions and mixing rate at 200 rpm for 30 minutes of reaction. The leaching filtrate was precipitated using NaOH solution while the formed precipitate was heated at 800 °C for 3 hours. The regenerated catalyst was characterized using FTIR and SEM-EDX. The SEM images showed regenerated catalyst prepared using the HCl solution has a different morphology compared to the one using the H2SO4 solution. Based on FTIR analysis, both samples exhibit Ni-O and C-O groups. Based on elemental analysis, the highest nickel concentration was obtained by using HCl with a Ni content of 25.98%w/w, compare to sulfuric acid (H2SO4) with a Ni content of 10.94%w/w. The Ni content can be improved by the addition of a washing step after the sintering process.Keywords:Hydrometallurgy Nickel Catalyst, Waste, Leaching, Sintering
Co-Authors Amelia, Fransisca Poppy Farid Wajdi Norman, Hafiz Salsabil, Muhammad Alhadilansa Yudha, Cornelius Satria