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Long Giang Bach
NTT Hi-Technology Institute, Nguyen Tat Thanh University, Ho Chi Minh City 755000, Vietnam
Chemical Engineering, Chemistry & Bioengineering Chemistry

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A Fixed-Bed Column Study for Removal of Organic Dyes from Aqueous Solution by Pre-Treated Durian Peel Waste Nguyen Thi Thuong; Nguyen Thi Tuyet Nhi; Vo Thi Cam Nhung; Hoang Ngoc Bich; Bui Thi Phuong Quynh; Long Giang Bach; Nguyen Duy Trinh
Indonesian Journal of Chemistry Vol 19, No 2 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (378.324 KB) | DOI: 10.22146/ijc.39712

Abstract

A number of harmful effects on the ecosystem, the life of humankind, and living species caused by dye-contaminated wastewater have urged the development for an efficient and cost-efficient treatment method for colored effluents. The cellulose-based adsorbents have been considered as a facile and efficient approach to remove hazardous pollutants because of the abundance of inexpensive agricultural wastes in Viet Nam. This study aims to investigate the elimination of methylene blue (MB) and crystal violet (VL) from wastewater using a fixed-bed column of pre-treated durian peel. Examined variables in the process are bed depths (2–6 cm), flow rate (5–20 mL/min), and influent dye concentrations (200–600 mg/L). The highest adsorption amount of pre-treated DP was 235.80 mg/g and 527.64 mg/g, respectively, on a 600 mg/L of methylene blue and crystal violet achieved within a bed height of 4 cm and a flow rate of 10 mL/min. Accordingly, the breakthrough curves were constructed and modeled using the relevant theoretical models under the effects of different experimental conditions. Pre-treated durian peel was found to exhibit high adsorption capacity for cationic dye in an initial concentration of 200–600 mg/L with complete removal being obtained.
Research on Lemongrass Oil Extraction Technology (Hydrodistillation, Microwave-Assisted Hydrodistillation) Thien Hien Tran; Duy Chinh Nguyen; Thuong Nhan Nguyen Phu; Van Thi Thanh Ho; Dai Viet Nguyen Vo; Long Giang Bach; Trinh Duy Nguyen
Indonesian Journal of Chemistry Vol 19, No 4 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (321.512 KB) | DOI: 10.22146/ijc.40883

Abstract

Microwave-assisted hydro-distillation (MAHD) is preferred to traditional extraction methods due to shorter extraction time, the inability of volatile components to be damaged or decomposed which in turn improve the efficiency and quality of essential oils. In this research, we investigated the parameters that affect the extraction of lemongrass oil process by MAHD method and compare with those of hydro-distillation (HD) method. Four parameters were identified which are: raw material size, raw material to water ratio, extraction time and microwave power. The results show that the optimum condition for determining the lemongrass essential oil content is 20 mm in the 90 min extraction time with a microwave power of 450 W at raw material to water ratio of 1:3 (g/mL). When compared to the HD method, we found that the yield lemongrass oil of MAHD method is 0.35% on 90 min and the yield of HD method is 0.2% on 360 min. The quality of oil samples at different extraction method was evaluated by determining their chemical constituents through GC-MS. The highest identified component is Citral with 93.28% for MAHD, while the HD was 83.85%. Therefore, MAHD method is highly efficient and shorten the time needed for the extraction of essential oils.
Co-Authors Bui Thi Phuong Quynh Dai Viet Nguyen Vo Duy Chinh Nguyen Hoang Ngoc Bich Nguyen Duy Trinh Nguyen Thi Thuong Nguyen Thi Tuyet Nhi Thien Hien Tran Thuong Nhan Nguyen Phu Trinh Duy Nguyen Van Thi Thanh Ho Vo Thi Cam Nhung