eprintid: 15957 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/01/59/57 datestamp: 2023-11-10 03:30:35 lastmod: 2023-11-10 03:30:35 status_changed: 2023-11-10 02:00:50 type: article metadata_visibility: show creators_name: Mohamad, M. creators_name: Wannahari, R. creators_name: Mohammad, R. creators_name: Shoparwe, N.F. creators_name: Nawi, A.S.M. creators_name: Lun, K.W. creators_name: Wei, L.J. title: Adsorption of malachite green dye using spent coffee ground biochar: Optimisation using response surface methodology ispublished: pub note: cited By 12 abstract: Used coffee grounds usually end up as landfill. However, the unique structural properties of its porous surface make coffee grounds can be transformed into biochar and performed as an alternative low cost adsorbent. Malachite green (MG) is a readily water soluble dye which is used extensively in textile and aquaculture industries. The mordant complex structures of MG generate destructive effects to animals and environment. In this study, adsorption of malachite green using spent coffee ground biochar as adsorbent was investigated. The experiments were designed in two methods: classical and optimisation by response surface methodology. Three parameters were studied, which are adsorbent dosage, contact time and pH while the responses in this study are malachite green removal () and adsorption capacity (mg/g). Optimisation studies were performed using response surface methodology. Quadratic model was chosen for both response and studied using central composite design. The correlation coefficient, R2 for the quadratic model of malachite green removal () and adsorption capacity (mg/g) were 0.95 and 0.99, respectively. The optimum malachite green removal () predicted was found at 99.27, by using 0.12 g of adsorbent dosage, 43.05 minutes of contact time and pH of 9.45 at desirability of 1.0. The optimum adsorption capacity (mg/g) predicted was found at 118.01 mg/g, by using 0.02 g of adsorbent dosage, 60 minutes of contact time and pH of 10.24 at desirability of 0.98. So, it was concluded that the spent coffee ground biochar can be used as an effective adsorbent for malachite green removal from aqueous solution. © 2021 Penerbit UTM Press. All rights reserved. date: 2021 publisher: Penerbit UTM Press official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097933489&doi=10.11113%2fjurnalteknologi.v83.14904&partnerID=40&md5=11c3eb4d6c808736a5c863a2af581d40 id_number: 10.11113/jurnalteknologi.v83.14904 full_text_status: none publication: Jurnal Teknologi volume: 83 number: 1 pagerange: 27-36 refereed: TRUE issn: 01279696 citation: Mohamad, M. and Wannahari, R. and Mohammad, R. and Shoparwe, N.F. and Nawi, A.S.M. and Lun, K.W. and Wei, L.J. (2021) Adsorption of malachite green dye using spent coffee ground biochar: Optimisation using response surface methodology. Jurnal Teknologi, 83 (1). pp. 27-36. ISSN 01279696