f.c. bond ball mill, bico | vwr
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Avantor, a Fortune 500 company, is a leading global provider of mission-critical products and services to customers in the biopharma, healthcare, education & government, and advanced technologies & applied materials industries. Our portfolio is used in virtually every stage of the most important research, development and production activities in the industries we serve. One of our greatest strengths comes from having a global infrastructure that is strategically located to support the needs of our customers. Our global footprint enables us to serve more than 225,000 customer locations and gives us extensive access to research laboratories and scientists in more than 180 countries. We set science in motion to create a better world. For information visit, www.avantorsciences.com and find us on LinkedIn, Twitter and Facebook.
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experimental and modeling investigations of ball-milled biochar for the removal of aqueous methylene blue - sciencedirect
Ball milling dramatically increased external and internal surface area of biochars.Ball milling increased the amount of acidic surface functional groups.Ball milling increased sorption ability of biochars to methylene blue.Homogenous surface diffusion model simulated sorption kinetics data well.Ball-milled biochar showed a short detention time in a completely mixed flow reactor.
Novel adsorbents were produced through the grinding of biochars of different feedstock and pyrolysis temperature in a planetary ball mill. The removal effectiveness and mechanisms of aqueous methylene blue by these adsorbents were examined. Ball milled sugarcane bagasse biomass pyrolyzed at 450C (BMBG450) had the highest methylene blue sorption capacity thus was chosen for further study. Compared to unmilled bagasse biochar (BG450), BMBG450 had greater specific surface area, larger pore volume, smaller hydrodynamic radius, stronger negative zeta potential (about 1.6-fold increase), and more oxygen-containing functional groups (1.05mmol/g increase). These characteristics resulted in much greater methylene blue removal capacity (354mg/g Langmuir maximum adsorption capacity vs. 17.2mg/g of original BG450). The increased in BMbiochars external and internal surface areas exposed its graphitic structure and oxygen-containing functional groups, thus enhancing methylene blue adsorption via interaction and electrostatic attraction. Experimental and modeling results suggest external mass transfer as the rate-limiting adsorption step for BG450 and surface diffusion as the rate-limiting adsorption step for BMBG450. BMbiochars had a lower equilibrium dosage and shorter reactor detention time when applied in a completely mixed flow reactor (CMFR).