Abstrak: Biosorben dari kulit salak (Salacca sumatrana) digunakan untuk mempelajari penyerapan Pb(II) dan Cd(II) dalam larutan dengan metode batch. Adsorpsi Pb(II) dan Cd(II) menggunakan kulit salak ini dipelajari pada variasi pH, konsentrasi adsorbat dan waktu kontak. Kondisi optimum penyerapan yang diperoleh pH 4 untuk Pb(II) dan 5 untuk Cd(II), konsentrasi adsorbat 1200 mg/L untuk Pb(II) dan 800 mg/L untuk Cd(II), waktu kontak 45 menit untuk Pb(II) dan 15 menit untuk Cd(II). Kapasitas penyerapan dari biosorben kulit salak sebesar 83,33 mg/g untuk Pb(II) dan 27,78 mg/g untuk Cd(II) dengan pola adsorpsi mengikuti isoterm Langmuir dengan koefisien determinasi 0,987 dan 0,937 dan data kinetika mengikuti model pseudo orde kedua. Konsentrasi Pb(II) dan Cd(II) sebelum dan setelah penyerapan ditentukan dengan Spektrometri Serapan Atom (SSA), karakterisasi kulit salak dilakukan dengan FTIR dan SEM. Adsorben kulit salak sangat baik digunakan untuk mengurangi kadar Pb(II) dan Cd(II) dalam larutan. Kata kunci: kulit salak, adsorpsi, logam beratAbstract: Biosorbent of salacca (Salacca sumatrana) husk was used to study the sorption of Pb (II) and Cd (II) ion from aqueous solutions by batch method. Adsorption using the salacca husk parameters studied was variation of pH, adsorbate concentration and contact time. The optimum condition adsorption occurred at pH 4 for Pb(II) and 5 for Cd(II), adsorbate concentration 1200 mg/L for Pb(II) and 800 mg/L for Cd(II) and contact time 45 minutes for Pb(II) and 15 minutes for Cd(II). Adsorption capacity of salacca husk biosorbent was 83.33 mg/g for Pb (II) and 27.78 mg/g for Cd (II). This Adsorption follows Langmuir isotherm pattern with determination factor 0.987 and 0.937. Kinetics data follows pseudo-second order model. Pb (II) and Cd (II) concentrations before and after adsorption were analyzed using Atomic Absorption Spectrometer (AAS), characterization of salacca husk was conducted by Fourier Transform Infra Red (FTIR) and Scanning Electron Microscopy (SEM). Adsorbent of salacca husk is potencial for decreasing amounts of Pb (II) and Cd (II) in the aqueous solution.
Abstrak: Kulit buah kapuk (Ceiba pentandra L) merupakan limbah pertanian yang belum dioptimalkan sampai sekarang. Penelitian biosorpsi Pb(II) dan Cd(II) menggunakan biosorben kulit buah kapuk telah dilakukan dengan metoda batch. Parameter yang dipelajari untuk penentuan kondisi optimum yaitu pH, konsentrasi awal, waktu kontak, massa biosorben dan ukuran partikel. Biosorben terlebih dahulu diaktivasi dengan HNO3 0,01 M. Kondisi optimum biosorpsi diperoleh pada pH 4, waktu kontak 15 menit, massa biosorben 0,025 g dan ukuran partikel ≤25 µm kedua ion logam, sedangkan konsentrasi awal larutan 1200 mg/L untuk Pb(II) dan 1000 mg/L untuk Cd(II). Studi isotherm adsorpsi mengikuti model isoterm Langmuir dengan koefisien determinasi (R 2 ) 0,9983 untuk Pb(II) dan 0,9892 untuk Cd(II). Kinetika adsorpsi mengikuti model pseudo orde dua yang menunjukkan bahwa adsorpsi terjadi secara kimia. Karakterisasi menggunakan FTIR menunjukkan bahwa biosorben mengandung gugus fungsi seperti -OH, dan -C=O yang berperan dalam proses biosorpsi, sedangkan karakterisasi menggunakan SEM menunjukkan adanya poripori biosorben sebelum menyerap ion logam dan poripori akan tertutup setelah menyerap ion logam. Kapasitas adsorpsi Pb(II) sebesar 223,72 mg/g dan Cd(II) 88,7 mg/g. Hal ini menunjukkan bahwa kulit buah kapuk merupakan biosorben potensial dengan biaya rendah dalam menyerap Pb(II) dan Cd(II). Abstract: Kapok husk (Ceiba pentandra L)is an agricultural waste that has not been optimized currently. Biosorption of Pb(II) and Cd(II) using Kapuk husk was studied by batch method. Biosorbent was activated by HNO3 0.01 M. The parameters studied for determining optimum conditions were pH, initial concentration, contact time, biosorbent mass and particle size.The optimum conditions for biosorption were obtained at pH 4, contact time15 minutes, biosorbent dosage 0.025 g and particle size ≤25 µmfor both metal ions, while initial concentration for Pb(II) was 1200 mg/L and Cd(II) was 1000 mg /L. The study of adsorption isotherm followed the Langmuir isotherm model with a determination coefficient (R 2 ) 0.9983 for Pb(II) and 0.9892 for Cd(II). Adsorption kinetics followed second order pseudo model which showed that adsorption occurs chemically. Characterization using FTIR showed that biosorbent contained the -OH and -C=O functional group which played a role in the biosorption process, while SEM characterization showed biosorbent pores before absorbing metal ions and the pores would be closed after absorbing.The adsorption capacity of Pb(II) was 223.72 mg / g and Cd(II) was 88.7 mg/g. This shows that Kapuk husk is a potential biosorbent with low cost in absorb Pb (II) and Cd(II).
The synthetic chemicals is a common substance used to extend the shelf life of postharvest fruit. But it can have health impact. The use of edible coatings from natural ingredients has begun to be developed. Modification of aloe vera gel by guava leaf extract as the edible coating to increase guava fruit shelf life has not been reported yet. Guava fruit coated by several compositions of aloe vera gel and guava leaf extract have been carried out. Observations on physichochemical in fruit on the days 0, 3, 6, 9, 12 and 15 were evaluated. The best quality found on guava fruit treated with the compotition of aloe vera gel:ethanol guava leaf extract: CMC:glycerol (90: 5:0.25: 0.5) on the day 15. It had a weight loss of 9.88%, a spoilage of 3.33%, the decrease of water content 11.61%, titratable acidity 0.5%, total antioxidant 1.08 mg AA/g FW, total phenolic 0.51 mg GAE/g FW, and increase of total dissolved solids 3.01 oBrix. This result was significantly better than the uncoated fruit. It can be concluded that guava leaf extract can be used to maintain the physicochemical properties during storage.
The Community Service Team of the Chemistry Department has worked closely with the Taman Pendidikan Qur'an (TPQ) and Rumah Tahzhul Qur'an (RTQ) Raudhatul Adzkia Jorong Dalam Koto Nagari Koto Tangah in solving problems faced by partners. The pond catfish farming business supports smooth operational costs and has been running for over a year, but these results still need to be improved for TPQ and RTQ. This activity aims to develop a catfish farming business accompanied by an aquaponic cultivation business to increase income from TPQ and RTQ. The benefit of this activity is that the partners have an Aquaponics business which is cultivating catfish and vegetable plants in the fish pond. The Community Service Team transferred knowledge to partners, especially in cultivating aquaponic plants through entrepreneurship. The activities of the Community Service Team in helping partners are a form of the Andalas University Higher Education Tri Dharma. The method applied to support the realization of this community service program was through supervision, program socialization, and implementation of activities. The result of this activity was that partners could run an aquaponics business to increase income to meet the operational costs of education and teacher salaries.
Green lettuce is a vegetable that is widely consumed in Indonesia. These vegetables come from conventional and hydroponic farming. This study aims to compare the antioxidant content of these two types of vegetables. This vegetable is extracted by the infundation method. The extract obtained was determined for its antioxidant content by the MPM method. This method was validated by using parameter LoD, LoQ, linearity, precision and accuracy. The results showed that this method was valid for determining the total antioxidant content in conventional and hydroponic green lettuce samples. The total antioxidant content in conventional and hydroponic green lettuce samples was 2.68 ± 0.65 mg aa/g FW and 1.67 ± 0.40 mg AA/g FW, respectively. T test stated that the antioxidant content of the two samples was significantly different.
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