Author
A.A.C.M. Beenackers
Bio: A.A.C.M. Beenackers is an academic researcher from University of Groningen. The author has contributed to research in topics: Titanium dioxide & Mass transfer. The author has an hindex of 12, co-authored 16 publications receiving 1716 citations.
Papers
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TL;DR: In this article, the chemical effects of various variables on the rate of degradation of different pollutants are discussed in detail, including adsorption, temperature, intensity of light, pH, and presence of anions, cations, etc.
Abstract: Photocatalysis is a rapidly expanding technology for wastewater treatment. In this review the chemical effects of various variables on the rate of degradation of different pollutants are discussed in detail. The effects of adsorption, temperature, intensity of light, pH, and the presence of anions, cations, etc have been specifically covered. A critical analysis of the available literature data has been made and some general conclusions have been drawn concerning the above mentioned effects. The need for more work on specific points has been brought out.
© 2001 Society of Chemical Industry
1,165 citations
TL;DR: The intermediates detected were o, p,m-nitrophenols and dihhydroxy derivatives indicating that degradation proceeds via z.rad;OH radicals, which indicates the effect of photon penetration depth on the degradation of nitrobenzene.
148 citations
TL;DR: In this article, the effect of system configurations (type of the impeller, D/T, and C/T), operating parameters (impeller speed/power input, particle loading, and gas flow rate), and physical properties (dP, Dm, μ, and Δρ) on kSL have been discussed elaborately.
Abstract: Knowledge of particle−liquid mass transfer coefficient (kSL) is important for a rational design of a solid−liquid/solid−liquid−gas stirred tank reactor (STR). Considerable efforts have been made by different investigators to study and correlate the behavior of kSL in STRs for a variety of geometric and operating conditions. This review attempts to put together and analyze the information available in the literature on kSL in STRs systematically. Different approaches used by researchers to correlate kSL are critically discussed. The effect of system configurations (type of the impeller, D/T, and C/T), operating parameters (impeller speed/power input, particle loading, and gas flow rate), and physical properties (dP, Dm, μ, and Δρ) on kSL have been discussed elaborately. Some new data for six-bladed impellers have been generated to determine the optimum geometric configuration and operating conditions for particle−liquid mass transfer in three-phase STRs. It is concluded that kSL in two-/three-phase STRs ca...
96 citations
TL;DR: In this article, the effect of initial phenol concentration, intensity and presence of anions has been studied in both the case of photocatalytic degradation and photochemical degradation.
Abstract: Photocatalytic (TiO2, air and solar radiation) and photochemical (H2O2 and solar radiation) mineralizations of phenol solutions (up to 500 mg dm−3) in a batch reactor using concentric solar radiation were studied. A compound parabolic reflector as a concentrating reflector was used to obtain concentrated solar radiation in both cases. Considerable enhancement (Five-fold) in the rate of degradation was obtained when concentrated solar radiation was used instead of plain solar radiation in photocatalytic degradation. The effect of initial phenol concentration, intensity and presence of anions has been studied in both the cases. Low concentrations of intermediates were observed, during the reaction, over the entire range of phenol concentrations studied in the case of photocatalytic degradation using Degussa-P25 TiO2 as photocatalyst and in the absence of anions; whereas significant quantities of intermediates were observed in the case of the photochemical degradation. The presence of anions generally had a detrimental effect on the mineralization process in both cases. Different anions showed different effects. Total organic carbon (TOC) variations with time were also studied. A rational explanation has been given for the decrease in the rate in the presence of anions.
© 2001 Society of Chemical Industry
82 citations
TL;DR: In this paper, Graaf, Scholtens, Stamhuis, and Beenackers used pseudo-first-order kinetics to predict the methanol and water effectiveness factors with a sufficient accuracy.
76 citations
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TL;DR: In this paper, photo-induced superhydrophilicity was used on the surface of a wide-band gap semiconductor like titanium dioxide (TiO 2 ) for photocatalytic activity towards environmentally hazardous compounds.
4,241 citations
TL;DR: The main conclusions arrived at from the overall assessment of the literature are that more work needs to be done on degradation kinetics and reactor modeling of the combined process, and also dynamics of the initial attack on primary contaminants and intermediate species generation.
2,046 citations
TL;DR: In this article, the authors highlight five different oxidation processes operating at ambient conditions viz. cavitation, photocatalytic oxidation, Fenton's chemistry, ozonation, and use of hydrogen peroxide.
1,852 citations
TL;DR: The field of surface science provides a unique approach to understand bulk, surface and interfacial phenomena occurring during TiO2 photocatalysis as mentioned in this paper, including photon absorption, charge transport and trapping, electron transfer dynamics, adsorbed state, mechanisms, poisons and promoters, and phase and form.
1,768 citations
TL;DR: A thorough review of alternative non-iron Fenton catalysts and their reactivity towards hydrogen peroxide activation is presented, describing in detail the complex mechanisms and emphasizes on practical limitations influencing their environmental applications.
1,618 citations