Is Fatimah, Dwiarso Rubiyanto, Septian Perwira Yudha, Gunarti Pratiwi and Ayu Puspita
The purpose of this study is to prepare composite of chitosan-modified smectite clays consisting of montmorillonite and saponite clay minerals and their urea adsorption–desorption…
Abstract
Purpose
The purpose of this study is to prepare composite of chitosan-modified smectite clays consisting of montmorillonite and saponite clay minerals and their urea adsorption–desorption study. Prepared materials were designed for slow-release fertilizer application.
Design/methodology/approach
Preparation of the composites was conducted by a simple intercalation of chitosan solution and clay suspension followed by hydrogel beads formation. Physicochemical characterization of materials was performed by X-ray diffraction, gas sorption analysis by using Brunauer–Emmett–Teller surface areas and pore volume, water absorbency and Fourier transform-infrared. Urea adsorption and desorption studies of prepared materials were conducted by using batch method, and the adsorbed and desorbed urea content was analyzed by using high-performance liquid chromatography method.
Findings
The results revealed that the composites have higher absorptivity and lower absorptivity toward urea from and into water solution compared to raw clay minerals. Adsorption capacity and slow desorption rate of urea from the composites suggested the potential application of the composites as slow urea-releasing agent.
Originality/value
There are many papers that study the formation of chitosan-clay composites, but the study on the urea adsorption–desorption properties based on chitosan-smectite minerals have not been reported. Intensive study related to physicochemical properties and its related kinetics study is an important basic finding for further applications.
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Fullchis Nurtjahjani, Ridolof Wenand Batilmurik, Ayu Fury Puspita and Jappy Parlindungan Fanggidae
This study aims to investigate the mediating and moderating effects of psychological ownership and belief in just world in the relationship between transformational leadership and…
Abstract
Purpose
This study aims to investigate the mediating and moderating effects of psychological ownership and belief in just world in the relationship between transformational leadership and work engagement.
Design/methodology/approach
The data were collected from 183 lecturers who teach in an Indonesian university. The questionnaires covered transformational leadership, psychological ownership, belief in just world and work engagement. The collected data were examined with structural equation model analysis.
Findings
The results demonstrated a significant moderated mediation index, which indicated that the relationship between transformational leadership and work engagement is mediated by psychological ownership and is moderated by belief in just world.
Practical implications
To achieve higher work engagement, organizations should increase employees’ feelings of ownership and boost just world belief.
Originality/value
The present study offers new insight on how personality trait plays a moderating role in the relationship between transformational leadership and work engagement.
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Puspita Ayu Permatasari, Faruq Ibnul Haqi, Fitri Utami Ningrum and Triana Rosalina Dewi
From Batik cities to woven textile regions, Indonesia possesses several fashion destinations with remarkable textile heritage. The rise of fashion heritage destinations is…
Abstract
From Batik cities to woven textile regions, Indonesia possesses several fashion destinations with remarkable textile heritage. The rise of fashion heritage destinations is characterized by avid textile lovers and fashion followers that promote the regions. Several diversifications of tourism alternatives are analyzed, such as rural tourism with experiential textile-making workshops, urban destinations connected to contemporary fashion heritage, architectural works inspired from/to textile heritage, as well as fashion week cities that spark the interests of global fashion designers to visit the country. This chapter evaluates the current state, its rising challenges, and to what extent it may be promoted through digital technologies, based on local practitioners and the governmental perspectives.