This study presents the use of chicken eggshells waste utilizing palm kernel shell based activated carbon（PKSAC） through the modification of their surface to enhance the adsorption capacity of H2S. Response surface ...This study presents the use of chicken eggshells waste utilizing palm kernel shell based activated carbon（PKSAC） through the modification of their surface to enhance the adsorption capacity of H2S. Response surface methodology technique was used to optimize the process conditions and they were found to be： 500 mg/L for H2S initial concentration, 540 min for contact time and 1 g for adsorbent mass. The impacts of three arrangement factors（calcination temperature of impregnated activated carbon（IAC）, the calcium solution concentration and contact time of calcination） on the H2S removal efficiency and impregnated AC yield were investigated. Both responses IAC yield（IACY, %） and removal efficiency（RE, %） were maximized to optimize the IAC preparation conditions. The optimum preparation conditions for IACY and RE were found as follows： calcination temperature of IAC of 880 ℃, calcium solution concentration of 49.3% and calcination contact time of 57.6 min, which resulted in 35.8% of IACY and 98.2% RE. In addition, the equilibrium and kinetics of the process were investigated. The adsorbent was characterized using TGA, XRD, FTIR, SEM/EDX, and BET. The maximum monolayer adsorption capacity was found to be 543.47 mg/g. The results recommended that the composite of PKSAC and Ca O could be a useful material for H2S containing wastewater treatment.展开更多
The phenolic and antioxidant constituents in Acacia nilotica fruits have become an important source of medicinal and thera-peutic benefit with powerful biological properties.This study investigated the phenolic conten...The phenolic and antioxidant constituents in Acacia nilotica fruits have become an important source of medicinal and thera-peutic benefit with powerful biological properties.This study investigated the phenolic content and antioxidant capacity of powdered Acacia fruits with seeds and without seeds.The phenolic content and antioxidant capacities in them were deter-mined using Folin-Ciocalteu and DPPH free radical-scavenging assays.The total phenolic and antioxidants of A.nilotica with seeds were spectrophotometrically determined to be 47.61 and 6.18%greater than when the seeds were removed from the dried fruits,respectively.The LC-MS/QTOF analysis shows the presence of 282 and 214 phenolic compounds in the methanol extracts of A.nilotica with seeds and without seeds,respectively.The present study,therefore,revealed that dried A.nilotica fruits with seeds have higher total phenolic content,antioxidant capacity,and bioactive constituents,which indi-cated that they have more medicinal value than fruits without seeds.展开更多
基金Funded by the Faculty of Chemical&Natural Resources Engineering,Universiti Malaysia Pahang through a Local Research Grant Scheme
文摘This study presents the use of chicken eggshells waste utilizing palm kernel shell based activated carbon（PKSAC） through the modification of their surface to enhance the adsorption capacity of H2S. Response surface methodology technique was used to optimize the process conditions and they were found to be： 500 mg/L for H2S initial concentration, 540 min for contact time and 1 g for adsorbent mass. The impacts of three arrangement factors（calcination temperature of impregnated activated carbon（IAC）, the calcium solution concentration and contact time of calcination） on the H2S removal efficiency and impregnated AC yield were investigated. Both responses IAC yield（IACY, %） and removal efficiency（RE, %） were maximized to optimize the IAC preparation conditions. The optimum preparation conditions for IACY and RE were found as follows： calcination temperature of IAC of 880 ℃, calcium solution concentration of 49.3% and calcination contact time of 57.6 min, which resulted in 35.8% of IACY and 98.2% RE. In addition, the equilibrium and kinetics of the process were investigated. The adsorbent was characterized using TGA, XRD, FTIR, SEM/EDX, and BET. The maximum monolayer adsorption capacity was found to be 543.47 mg/g. The results recommended that the composite of PKSAC and Ca O could be a useful material for H2S containing wastewater treatment.
基金the financial contribution of the Ministry of Higher Education,Malaysia,for their support through the FRGS(RDU-160148)research grants.
文摘The phenolic and antioxidant constituents in Acacia nilotica fruits have become an important source of medicinal and thera-peutic benefit with powerful biological properties.This study investigated the phenolic content and antioxidant capacity of powdered Acacia fruits with seeds and without seeds.The phenolic content and antioxidant capacities in them were deter-mined using Folin-Ciocalteu and DPPH free radical-scavenging assays.The total phenolic and antioxidants of A.nilotica with seeds were spectrophotometrically determined to be 47.61 and 6.18%greater than when the seeds were removed from the dried fruits,respectively.The LC-MS/QTOF analysis shows the presence of 282 and 214 phenolic compounds in the methanol extracts of A.nilotica with seeds and without seeds,respectively.The present study,therefore,revealed that dried A.nilotica fruits with seeds have higher total phenolic content,antioxidant capacity,and bioactive constituents,which indi-cated that they have more medicinal value than fruits without seeds.
