Studying the preparation of activated carbon from macadamia nut shells by chemical activation with naoh in methylene blue treatment application - Doan Nguyen Hoang Anh

TRƯỜNG ĐẠI HỌC SƯ PHẠM TP HỒ CHÍ MINH TẠP CHÍ KHOA HỌC HO CHI MINH CITY UNIVERSITY OF EDUCATION JOURNAL OF SCIENCE ISSN: 1859-3100 KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ Tập 15, Số 3 (2018): 89-99 NATURAL SCIENCES AND TECHNOLOGY Vol. 15, No. 3 (2018): 89-99 Email: tapchikhoahoc@hcmue.edu.vn; Website: 89 STUDYING THE PREPARATION OF ACTIVATED CARBON FROM MACADAMIA NUT SHELLS BY CHEMICAL ACTIVATION WITH NaOH IN METHYLENE BLUE TREATMENT APPLICATION Doan Nguyen Hoang Anh, Pham Mai Ly*, Dao Minh Trung Thu Dau Mot University Received: 11/01/2018; Revised: 06/3/2018; Accepted: 26/3/2018 ABSTRACT Study on preparation of activated carbons by chemical activation with NaOH using the impregnatio ratio of 3:1 (NaOH:char) from Macadamia nut shell in terms on temperature and time. The research result showed that Methylene Blue (MB) absorption at optimum temperature and time of 300oC and 90 minutes was 205,68 mg and the removal efficiency was 97,59% corresponding to the color reduction from 349,67 Pt-Co to 8,4 Pt-Co. This results showed that activated carbons prepared from Maccadia nut shells and chemical activation with NaOH had the capable of color treatment in textile wastewater. Keywords: activated carbon, macadamia nut shells, MB absorption. TÓM TẮT Nghiên cứu điều chế than hoạt tính từ vỏ hạt Mắc-ca sử dụng tác nhân hoạt hóa NAOH ứng dụng xử lí Metylen Blue Nghiên cứu điều chế than hoạt tính bằng cách kích hoạt hóa học với NaOH theo tỉ lệ ngâm 3:1 (NaOH:than) từ vỏ hạt Mắc-ca theo hai yếu tố về nhiệt độ và thời gian. Kết quả nghiên cứu cho thấy tại nhiệt độ và thời gian tối ưu là 300oC và 90 phút, than hoạt tính đạt được độ hấp phụ Methylen Blue (MB) là 205,68mg và hiệu suất loại bỏ 97,59% tương ứng với độ màu giảm từ 349,67 Pt-Co xuống còn 8,4 Pt-Co. Qua kết quả nghiên cứu cho thấy, than hoạt tính được điều chế từ vỏ hạt Mắc-ca và kích hoạt hóa học với NaOH có khả năng xử lí màu trong nước thải dệt nhuộm. Từ khóa: than hoạt tính, vỏ Mắc-ca, hấp phụ màu Methylen Blue. 1. Introduction Activated Carbons are well-known as a highly adsorbent material and are used in many water treatment fields [1], [2]. The adsorption capacity of activated carbon is * Email: mt.lypham@gmail.com TẠP CHÍ KHOA HỌC - Trường ĐHSP TPHCM Tập 15, Số 3 (2018): 89-99 90 influence by many factors such as structural characteristic, surface chemistry functional groups [3], surface area, ash content [4]. In face, activated carbons are prepared from two main sources, that are coal and agricultural waste such as coconut shells coal [5], husk [6], bamboo coal [7]. In Vietnam, Macadamia are growing in the North West and Tay Nguyen areas in recent years. By 2020 years, there are 10.000 ha of land that can be used to plant Macadamia [8]. According to the report of [9], each ton of nut shells can emit 70 – 77% of the shells in annual years. Most of shells are considered as waste products, only a few are used as fuel [10], [11]. However, according to the research report [12], [13], [14] showed that the Macadamia shells had many attractive features to prepare activated carbon such as Carbon content (47 – 49%), carbon content of Macadamia was higher than one of bamboo coal (45,53%) [15] and they equaled with carbon content in coconut shell coal (48,63%) [15]. In addition, the shells contained 46,52% oxygen; 6,10% hydrogen; 0,36% nitrogen and ash content was only 0,22% [12], the above characteristics showed that Macadamia has the potential to be activated carbon. Activated carbons preparation process from Macadamia nut shell was activated with various agents such as CO2 or water vapor [16], [17], [18]; KOH and ZnCl2 [19, 20]; NaOH [11] and H3PO4 [21]. Thus, in this study, activated carbons was prepared from Macadamia nut shells by chemical activation with NaOH. In addition, Bio-activated carbons were investigated Methylene Blue adsorption capacity in textile wastewater. 2. Experimental 2.1. Materials - Research subjects: Methyllen Blue (C16H18CIN3S.3H2O, 99%, China) has a concentration of 25mg/L (corresponding to 349,67 Pt-Co, TCVN 6185:2005). - Research chemicals: Na2HPO4.12H2O (98%, China), KH2PO4 (98%, China), NaOH (96%, China). HCl 1N (China). - Research materials: Macadamia nut shells are harvested in Lam Dong province. - Research equipment: Jartest. This equipment is produced with a six - place multiple stirrer system. The turbine-type stirrer consists of a plat panel in the same vertical, that are placed in 1 L beaker for the same type of waste water. They operate by a gear-box, that can be used to adjust spin speed. 2.2. Experimental methods TẠP CHÍ KHOA HỌC - Trường ĐHSP TPHCM Doan Nguyen Hoang Anh et al. 91 2.2.1. Part 1: Preparation of bio-activated carbon from Macadamia nut shells Fig 2.1. The layout of experiments to prepare activated carbon Macadamia nut shells Char preparation survey Temperature: 250 – 450oC Time: 40 – 100 mins Activation process survey Temperature: 300 – 800oC Time: 30 – 120 mins Activated carbons MB adsorption test Soak with ratio of 3:1 (NaOH:char) in 2h Dry at 110oC in 48h Dry at 130oC in 4h Washed with HCl 1N and H2O Swat and washed Dry 1100C in 24h MB adsorption test The best activated carbon sample at 300oC, 60 mins The best coar sample at 350oC, 60 mins TẠP CHÍ KHOA HỌC - Trường ĐHSP TPHCM Tập 15, Số 3 (2018): 89-99 92 2.2.2. Part 2: Survey of methylene Blue absorption ability Fig 2.2. Layout of Methylene Blue treatment experiments by activated carbon 2.3. Evaluation methods - Determination of pH by Mettler Toledo equidment (2017). - Determination of colour by TCVN 6185:2005. - Determination of surface observation by Scanning Electron microscope (SEM). 8 9 10,5 12 Waste water pH survey Dosage survey Measurement of colour Optimal dosage Activated carbons 5 9,5 10 11 Optimal pH 0,5g/L 1g/L 1,5g/L Measurement of colour Data processing TẠP CHÍ KHOA HỌC - Trường ĐHSP TPHCM Doan Nguyen Hoang Anh et al. 93 - Determination of functional groups by Fourier Transformation Infrared Spectrometer (FT-IR). - Determination of Methylene Blue absorption index by GB/T 12496.10 – 1999 Standard. 3. Results and discusstion 3.1. Results of Activated Carbon preparation from Macadamia nut shells 3.1.1. Survey of temperature affecting activation process Fig 3.1. Optimum temperature determination results according to Methylene Blue Absorption From Fig 3.1 showed that temperature was determinated in increasing range from 250 to 800oC and time in 90 minutes. After this survey, the maximum MB absorption reached 300oC và MB index reached 205,3mg MB/ g than. This research results showed that absorption capacity of activated carbons that were activeated by NaOH was higher than some materials from previous study results such as study of [22] showed that the garlic shell materals were used to absorb MB with 82,64mg/g or the research results using tea leaves in the research of [23], the absorption was 85,16mg/g. In addition, the study results of [24] researched absorption capacity of husks that reaching 40,59mg/g and the research results of [25] showed that orange peel adsorption reached 18,60mg/g or the research of [26] with report about fly ash material was 75,52mg/g. 60.61 205.30 140.71 62.74 52.88 16.67 21.85 24.39 32.48 30.34 27.36 30.23 0 50 100 150 200 250 250 300 350 400 450 500 550 600 650 700 750 800 M et hy le ne B lu e In de x (m g/ g) Temperture(oC) TẠP CHÍ KHOA HỌC - Trường ĐHSP TPHCM Tập 15, Số 3 (2018): 89-99 94 Thus, this above research results showed that activated carbon was found optimum temperature at 300oC with the best absorption efficient. 3.1.2. Survey of reaction time affecting activation process Fig 3.2. Optimum time determination results according to Methylene Blue Absorption From research results in Fig 3.2, the time was surveyed in range of 30, 60, 90 and 120 minutes at optimum temperature (300oC). This results showed that absorption decreased from 117,37 mg/g (at 30 minutes) to 99,35 mg/g (at 60 minutes). When the heating time increased to 90 minutes, the adsorption increased dramatically 205,68 mg/g and continued to decrease to 100,16 mg/g at 120 minutes. Thus, the research results showed that 300 oC and 90 mins were optimal parameters to achieve the best MB absorption ability. Comparation with some of previous study results such as the study results of [27] showed that activated carbon prepared from rubber waste was be used to remove MB from aqueous solution and the efficiency reached 49 mg/g; the research results of [28] researched MB adsorption capacity of coir pith carbon material 5,87 mg/g or based on the results of [29] reported on cereal grains’s capacity with absorption of 26,3mg/g and in 2007 years, the study of [30] successfully investigated the adsorption capacity of fallen phoenix tree's leaves with the adsorption up to 89,7mg/g; according to the research results of [31], the MB removal capacity of Hazel nut shell reached 38,22 mg/g. 117.37 99.35 205.68 100.16 0.00 50.00 100.00 150.00 200.00 250.00 30 60 90 120 M B in de x (m g/ g) Time (min) TẠP CHÍ KHOA HỌC - Trường ĐHSP TPHCM Doan Nguyen Hoang Anh et al. 95 Thus, This study results showed that activated carbon with NaOH chemical activation had MB absorption capacity higher than those studies. The research results was determinated optimal parametes at 300oC and 90 mins and the removal ability was 205,68 mg/g corresponding to 1g char absorp 205,68 mg MB. 3.2. The treatment capacity survey results of activated carbon on Methylene Blue 3.2.1. Survey optimum pH for treatment process Fig 3.3. Optimum pH determination results according to the MB treatment efficient The study results on MB treatment ability in Fig 3.3 showed that pH was ranged from 5 to 12 [32, 33] corresponding to the lowest efficiency at pH = 12 (71,64%) and the highest efficient at pH = 10,5 (97,23%). There by, pH value of 10,5 is pH range with the highest treatment efficiency. According to the study results of [34] and [35] they explained that pH had influence on MB absorption capacity of activated carbon material. When the pH in solution was adjusted at low-level, colour treatment ability of activated carbon would work on the protonation of functional groups and through electrostatic repulsion, MB was readily removed from solution. When solution was adjusted with high pH, surface of activated carbon was negatively charged, so they would be based on electrostatic attraction and hydrogen bonds to remove colourants. Treatment ability of activated carbon in this study with the 97,23% efficient was higher than some of previous study results such as the research results of [36] showed that TẠP CHÍ KHOA HỌC - Trường ĐHSP TPHCM Tập 15, Số 3 (2018): 89-99 96 the colour removal efficiency of sawdust was only 74% and the report results of [29] investigated the adsorption capacity of chaff and reached 84%, at the same pH. Thus, activated carbon prepared from Macadamia nut shells with NaOH chemical activation in this study had the best MB removal ability at pH = 10,5 with 97,23%. 3.2.2. Results of activated carbon’s dosage investigation for treatment process Fig 3.4. Optimum dosage determination results according to the MB treatment efficient The results of dosage (from 0,5 – 1,5 g/L) [37] survey in Fig 3.4 showed that the highest MB removal efficiency of 97,59% with 1 g activated carbon /L waste water. According to the research results of [34] suggested that the pore size and activated carbon dosage were two factors that significantly influence to MB absorption ability. The increasing amount of absorbed surface area, the absorption capacity would be increased significantly. Comparation to some previous studies such as the research results of [36] showed that after 30 minutes, MB treatment efficiency of activated carbon prepared from sawdust reached 35,8% when using H2SO4 chemical agent and 22,8% when using with formaldehyde agent. This proved that the treatment ability of activated carbon in this study was better than some material in previous studies. This research results showed that activated carbon prepared from Macadamia nut shells and NaOH chemical agent had MB treatment capacity with 97,59% for the assimed wastewater in the laboratory with a concentration of 25 mg/L corresponding to 349,67 Pt-Co. 86.27 97.59 88.02 80 82 84 86 88 90 92 94 96 98 100 0.5 1 1.5 M B tr ea tm en t e ffi ci en cy (% ) Dosage (g/L) TẠP CHÍ KHOA HỌC - Trường ĐHSP TPHCM Doan Nguyen Hoang Anh et al. 97 3. Conclution Research results showed that bio-activated carbon material was successfully prepared from Macadamia nut shells by chemical activation with NaOH at 300oC and 90 minutes operation parameters, MB index of this material reached 205,68mg/g corresponding to the MB treatment efficiency at pH = 10,5 and amount of 1g/L was 97,59%. 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