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"Benzena dan toluena merupakan senyawa yang banyak digunakan sebagai pelarut dalam industri kimia. Akan tetapi, senyawa ini juga dikategorikan sebagai limbah yang berbahaya (B3) apabila mengkontam inasi air. Pada penelitian ini akan diuji efek adsorpsi batubara dengan perlakuan sederhana dan batubara teraktivasi terhadap benzena dan toluena dengan memasukkan batubara tersebut dalam jumlah yang sama ke larutan benzena dan toluena pada konsentrasi yang bervariasi (50 sampai 1000 ppm) dengan proses batch. Hasil yang didapatkan dari penelitian ini adalah besar luas permukaan adsorben dan pengaruhnya terhadap kemampuan adsorpsi, pengaruh konsentrasi benzena dan toluena terhadap kemampuan adsorpsi, dan kurva adsorpsi isotermis. Luas permukaan yang didapatkan adalah 0,2687 m 2/g untuk sampel batubara awal, 4,49 m 2/g untuk sampel batubara dengan diberi perlakuan pemanasan, dan 854,2 m2/g untuk batubara teraktivasi. Adsorpsi kesetimbangan Langmuir cukup memadai dalam merepresentasikan hasil percobaan adsorpsi dimana nilai konstanta Langmuir untuk benzena adalah Qm= 138,89 mg/g dan b = 45,45 untuk batubara dengan perlakuan sederhana, Qm=227,27 g/g dan b = 78,125 untuk batubara teraktivasi. Sedangkan, nilai konstanta Langmuir untuk toluena adalah Q m= 147,06 mg/g dan b = 70 untuk batubara dengan perlakuan sederhana, Q m=384,62mg/g dan b = 123,23 untuk batubara teraktivasi.

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Benzene and toluene are substances frequently used for solvent in chemical industries. However, these substances are also hazardous waste if they are contaminated in water. The goal of this study is to examine the effect of using simply treated coal and activated coal on the adsorption of benzene and toluene by dispersing the same amount of coals into varied concentration of benzene and toluene solution (50 unto 1000 ppm) in a batch process. Results obtained in this study include surface area of the treated coals and their effects on the adsorption capability, effects of benzene and toluene concentration on the adsorption capability, and the is otherm adsorption curves. Surface area of original coal is obtained to be 0,2687 m2/g , 4,49 m2/g for simply treated coal, and 854,2 m2/g for activated coal. The langmuir adsorption model can adequately represent the experimental isotherm adsorption data, where the values of Langmuir constants for benzene are Qm= 138,89 mg/g and b = 45,45 on simply treated coal, and Qm=227,27 mg/g and b = 78,125 for activated coal. Meanwhile, the values of Langmuir constants for toluene are Qm= 147,06 mg/g and b = 170 on simply treated coal, and Qm=384,6 2mg/g and b = 23,23 for activated coal.;Wa Coal ; W"

"The potential of carbon nanotubes (CNTs) produced in our laboratory to be used for hydrogen storage was tested in this study. The test includes the determination of the hydrogen gas adsorption capacity and the dynamics of the adsorption and desorption of hydrogen on CNTs at isothermal temperature of 25oC and pressures of 0–1,000 psia. A similar test was also conducted on commercial CNTs obtained from the Chinese Academy of Sciences for comparison. The results showed that the hydrogen adsorption capacity of the local CNTs is lower than that of commercial CNTs. At pressures around 960 psia, the adsorption capacities of local and commercial CNTs are 0.09% and 0.13% weight, respectively. In general, the hydrogen adsorption data of both the adsorbents can be represented well by the Langmuir model, with less than 3% absolute average deviation (AAD). The dynamics of adsorption and desorption can be represented well by the Gasem and Robinson model with less than 2% AAD. The adsorption and desorption processes on both local and commercial CNTs occurred very quickly. At the highest pressure (960 psia), the adsorption and desorption equilibriums on the local CNTs were reached in approximately 30 s, while on commercial CNTs, they were reached in 2 s. The rates of the adsorption equilibriums on both local and commercial CNTs increase at a higher pressure. In the desorption process, while the equilibrium time is reached slightly faster at a higher pressure on commercial CNTs, the time is almost similar at all pressures for local CNTs."