Effect of pH and activated charcoal adsorption on hemicellulosic hydrolysate detoxification for xylitol production

2004 ◽  
Vol 79 (6) ◽  
pp. 590-596 ◽  
Author(s):  
Solange I Mussatto ◽  
Júlio C Santos ◽  
Inês C Roberto
Keyword(s):  
Activated Charcoal ◽  
Xylitol Production ◽  
Effect Of Ph ◽  
Hemicellulosic Hydrolysate ◽  
Charcoal Adsorption ◽  
Activated Charcoal Adsorption

scholarly journals Evaluation of nutrient supplementation to charcoal-treated and untreated rice straw hydrolysate for xylitol production by Candida guilliermondii

2005 ◽  
Vol 48 (3) ◽  
pp. 497-502 ◽  
Author(s):  
Solange Inês Mussatto ◽  
Inês Conceição Roberto
Keyword(s):  
Calcium Chloride ◽  
Rice Straw ◽  
Rice Bran ◽  
Activated Charcoal ◽  
Candida Guilliermondii ◽  
Xylitol Production ◽  
Nutrient Supplementation ◽  
Hemicellulosic Hydrolysate ◽  
Rice Straw Hydrolysate ◽  
Xylitol Yield

Xylitol was produced by Candida guilliermondii from charcoal-treated and untreated rice straw hemicellulosic hydrolysate with or without nutrients (ammonium sulphate, calcium chloride, rice bran extract). Both, xylitol yield and volumetric productivity decreased significantly when the nutrients were added to treated and untreated hydrolysates. In the treated hydrolysate, the efficiency of xylose conversion to xylitol was 79% when the nutrients were omitted. The results demonstrated that rice straw hemicellulosic hydrolysate treated with activated charcoal was a cheap source of xylose and other nutrients for xylitol production by C. guilliermondii. The non-necessity of adding nutrients to the hydrolysate media would be very advantageous since the process becomes less costly.

scholarly journals Temperature Effects Associated with the Adsorption of Neodymium Ions onto Activated Charcoal

2005 ◽  
Vol 23 (5) ◽  
pp. 399-406 ◽  
Author(s):  
Riaz Qadeer
Keyword(s):  
Activation Energy ◽  
Activated Charcoal ◽  
Temperature Effects ◽  
Adsorption Process ◽  
First Order ◽  
First Order Kinetics ◽  
Charcoal Adsorption ◽  
Increasing Temperature ◽  
Kinetics Of ◽  
Activated Charcoal Adsorption

The temperature dependence of the kinetics of the adsorption of neodymium ions from aqueous solution onto activated charcoal has been studied. The results obtained indicate that a form of equilibration appears to be attained after ca. 30 min although further very slow changes may occur over a much longer period. The adsorption process is controlled by the diffusion of neodymium ions into the pores of the activated charcoal. Adsorption follows first-order kinetics with an activation energy of 13.09 kJ/mol. Values of the equilibrium constant for the adsorption of neodymium ions onto activated charcoal increase with increasing temperature, thereby indicate the endothermic nature of the process.

Fermentation of sugar cane bagasse hemicellulosic hydrolysate for xylitol production: Effect of pH

1997 ◽  
Vol 13 (1-2) ◽  
pp. 11-14 ◽  
Author(s):  
Maria G.A. Felipe ◽  
Michele Vitolo ◽  
Ismael M. Mancilha ◽  
Silva S. Silva
Keyword(s):  
Sugar Cane ◽  
Sugar Cane Bagasse ◽  
Xylitol Production ◽  
Effect Of Ph ◽  
Hemicellulosic Hydrolysate ◽  
Production Effect

scholarly journals Arang Aktif dari Ampas Kopi sebagai Absorben Logam Cu Terlarut dalam Skala Laboratorium

2019 ◽  
Vol 8 (3) ◽  
pp. 237-240
Author(s):  
Asnita Fraselina Samosir ◽  
Bambang Yulianto ◽  
Chrisna Adhi Suryono
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Atomic Absorption ◽  
Activated Charcoal ◽  
Negative Impact ◽  
Growth Inhibitor ◽  
Laboratory Method ◽  
Experimental Laboratory ◽  
Charcoal Adsorption ◽  
Activated Charcoal Adsorption

Pencemaran logam berat Tembaga (Cu) di lingkungan perairan laut saat ini semakin meningkat. Logam berat ini memberikan dampak negatif bagi biota dalam perairan laut dengan menjadi penghambat pertumbuhan hingga menyebabkan kematian. Arang aktif dari ampas kopi dapat dimanfaatkan sebagai salah satu bioadsorben yang efektif. Penelitian mengenai penggunaan ampas kopi sebagai bioadsorben telah banyak dilakukan. Penelitian ini bertujuan untuk mengetahui kemampuan daya serap oleh arang aktif ampas kopi dengan lama perendaman dan konsentrasi yang berbeda terhadap logam berat Tembaga (Cu). Penelitian ini dilakukan pada tanggal 3 Juni – 18 Juli 2018. Metode yang digunakan ialah metode eksperimental laboratoris. Aktivasi adsorben dilakukan menggunakan HCl 0,1 M selama 48 jam. Kemudian arang aktif dikeringkan pada suhu 1100C selama 3 jam untuk meningkatkan daya serapnya. Berdasarkan analisa Atomic Absorption Spectrophotometric (AAS) yang telah dilakukan diperoleh daya serap arang aktif dengan konsentrasi 0,5 gr, 1 gr, dan 2 gr dengan masing-masing lama perendaman 15 menit, 30 menit, 60 menit, 90 menit, dan 120 menit berturut-turut adalah 99,28 %; 95,70 %; 98,79 %; 99,50%; 97,98 %; 95,39 %; 98,66 %; 99,46 %; 99,92 %; 97,04 %; 96,83 %; 98,57 %; 99,94 %; dan 99,96 % dengan kecepatan pengadukan 150 rpm. Konsentrasi adsorben dan lama perendaman yang berbeda terhadap larutan logam Cu diketahui berpengaruh nyata terhadap penyerapan logam berat Cu (p<0,05) oleh arang aktif. Terdapat penurunan daya adsorpsi arang aktif pada lama perendaman 30 menit kemudian tetap mengalami kenaikan daya adsorbsi terhadap logam Cu dengan semakin lama lama perendaman serta semakin tinggi konsentrasi adsorben yang digunakan. Pollution of heavy metals Copper (Cu) in the marine environment is currently increasing. This heavy metal has a negative impact on biota in marine waters by becoming a growth inhibitor that causes to death. Activated charcoal from coffee wastes can be used as an effective bio-adsorbent. Research on the use of coffee wastes as bio-adsorbent has been widely studied. This study aims to knowing the ability of activated charcoal from coffee wastes to absorb heavy metal of copper (Cu) using different immersion times and different concentrations of activated charcoal. The study was conducted on June 3 - July 18, 2018. The method used in this study was an experimental laboratory method. Activation of the adsorbent was carried out using 0.1 M HCl for 48 hours. Then the activated charcoal is dried at 1100C for 3 hours to improve the adsorption capacity of the adsorbent. Based on the analysis of Atomic Absorption Spectrophotometric (AAS), the absorption of activated charcoal has been obtained with concentrations of 0.5 gr, 1 gr, and 2 gr with contact time of 15 minutes, 30 minutes, 60 minutes, 90 minutes and 120 minutes are 99.28%; 95.70%; 98.79%; 99.50%; 97.98%; 95.39%; 98.66%; 99.46%; 99.92%; 97.04%; 96.83%; 98.57%; 99.94%; and 99.96% with a stirring speed of 150 rpm. The concentration of the adsorbent and the different immertion times for copper (Cu) solutions significantly affected the absorption of Cu heavy metals (p <0.05) by activated charcoal. There was a decrease in activated charcoal adsorption power at the immertion time of 30 minutes and continued to increase the adsorption power of Cu metal with the longer immertion time and the higher the concentration of the adsorbent used.

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