Utilization of treated coffee husk as low-cost bio-sorbent for adsorption of methylene blue

Abstract

Dyes and pigments have been used in many industries for colorization purpose but they pose hazards to the environment and end users of water. Therefore, it is important to remove this pollutant from waste water before their final disposal. This study aimed to investigate the removal of methylene blue by cost effective, ecofriendly, high-efficiency bio-sorbent from activated coffee husk. The process was carried out using chemical activation (H3PO4) process. Fourier transform infrared spectroscopy and surface analyzer (Brunauer-Emmett-Teller) were used to characterize the adsorbent. The specific surface area adsorbent was obtained as 28.54 m2/g. The maximum removal efficiency was obtained as 96.9% at pH of 5, initial dye concentration of 20 mg/L, adsorbent dosage of 0.8 g/50 mL, for contact time of 50 min and 30°C temperature on the activation surface of coffee husk. Langmuir model was found to fit the equilibrium data for methylene blue adsorption with 6.82 mg/g at 30°C. The adsorption process follows the pseudo-second-order model. Thermodynamics analysis showed that the adsorption of methylene blue on to the activated coffee husk was a spontaneous and endothermic process. The experimental data obtained in the present study proved that coffee husk is a suitable bio-sorbent in removal of cationic dyes.

Investigation on gasification of coffee husk in CO2, H2O, and mixed atmospheres

“…Coffee husk exhibited a high fixed carbon content of 20.9 %, indicating a high degree of graphitization and a low number of functional groups. [23] The high heating value (HHV) was found to be 18.3 MJkg -1 , which could be competitive with the heating value of wood (typically in the range of 17.9-20.5 MJkg -1 ). [24] These results show that coffee husk has good energy properties; hence it could be a suitable feedstock for thermochemical conversion processes.…”

Khí Hóa Vỏ Hạt Cà Phê Trong Môi Trường Liên Quan Đến Các Quy Trình Công Nghiệp

“…Hàm lượng tro cao trong vỏ hạt cà phê cần được xem xét do nó góp phần tiêu cực vào quá trình tạo xỉ, bám bẩn, thiêu kết và ăn mòn thiết bị. Vỏ hạt cà phê có hàm lượng cacbon cố định cao 20,0%, cho thấy mức độ graphit hóa cao và số lượng nhóm chức thấp [16]. Nhiệt trị cao (HHV) của vỏ hạt cà phê đạt 18,6 MJkg -1 , có thể so sánh được với giá trị nhiệt của gỗ (thường trong khoảng 17,9 -20,5 MJkg -1 ) [17].…”

Optimization of the Carbonization Parameter of Exhausted Coffee Husk (ECH) as Biochar for Pb and Cu Removal Based on Energy Consumption

“…The precursor material used for the production of AC such as coal and lignocellulosic material from biomass are expensive to procure and often need to be imported. There has been a growing interest wherein the feasibility of using alternative lignocellulosic biomass from agricultural activities such as coffee residues (Ayalew & Aragaw, 2020;Gonçalves et al, 2013).…”