Adsorption of methylene blue and congo red dye from water onto cassava leaf powder

The suitability of Cassava leaf (CL) as low-cost adsorbent for dyes adsorption was evaluated in this study. Methylene blue (MB) and Congo red (CR) dye was chosen as adsorbate in this work as these two types of dyes are widely used in the industries. The impactof various parameters such as adsorbent dosage, pH, temperature and contact time for dye adsorption on CL were investigated. 99.9% removal of MB dye was achieved at pH of 11.0, temperature of 45 °C, 0.5 g of CL under 60 minutes of contact time. Meanwhile, 99.7% removal of CR dye was obtained under similar contact time but at pH of 2.0, room temperature and smaller dosage of CL at 0.2 g. Based on the isotherms study, MB dye adsorption was best fitted in both Langmuir and Freundlich isotherms while Temkin isotherm was best fitted for CR dye adsorption on CL

A review of manufacturing sustainability assessment tool selection criteria: A quantitative score-rating system versus process-data sustainability assessment

The scarcity of natural resources has urged the necessity to adopt sustainability practices into current industrial activities. Manufacturing industries have a significant contribution towards socio-economic development by creating job opportunities for the communities and stimulating economic growth. Manufacturing activities are also well-known for their considerably high consumption of natural resources and waste generation. With these underlying issues, research has been actively carried out to develop a holistic framework in both conceptual and practical manners for sustainability improvements, specifically in the manufacturing sectors. Various methods in the research field often lead to the dilemma of selecting the appropriate methods for application. A comprehensive review is desirable to understand the current research efforts by evaluating the specific research problems, methodology developments, and research findings. This paper aims to evaluate the available sustainability assessment methods that were demonstrated with case studies, thereby defining the common practices adopted by the researchers in opting for their preferred methods. A systematic review was conducted to identify the common selection criteria for sustainability assessment methods. This study could provide a holistic insight to streamline the available options and justify their selection according to the application needs