Photocatalytic degradation of lignin on synthesized Ag–AgCl/ZnO nanorods under solar light and preliminary trials for methane fermentation

Li, Huifang; Lei, Zhongfang; Liu, Chunguang; Zhang, Zhenya; Lu, Baowang

doi:10.1016/j.biortech.2014.10.143

Cited by 68 publications

(27 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The degradation increased from 28.4% at pH 4 to 73.6% at pH 13.2, corresponding to 159% increase in activity. This observation is in agreement with the result from Li et al (2015). This effect is probably associated with the acid-base equilibrium of the adsorbed hydroxyl group; higher pH favors the generation of hydroxyl radicals.…”

Section: Effect Of 30 Wt % H2o2 Dosage On Lignin Degradationsupporting

confidence: 92%

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Chen

Yan

2017

BioResources

View full text Add to dashboard Cite

A graphene/hemin (H-GN) catalyst for lignin degradation was prepared by a wetchemistry method with graphene oxide and hemin. Hemin was absorbed onto the graphene surface through π-π interaction. Graphene served as a supporting material for hemin, providing a large contact area between the active molecules of catalyst and substrate, as well as protecting hemin from self-oxidation and maintaining its active molecules. The H-GN catalyst showed high catalytic efficiency in the degradation of alkaline lignin under gentle conditions. At pH 13.0, the degradation rate was 49.7% with H-GN and H2O2 (mass ratio of H2O2 to lignin of 10:1) under 60 °C, which was higher than 34.9% for non-catalyst degradation. At pH 13.2, it was as high as 92.9 wt.% at 100 °C. The lignin was decomposed into small molecules with styrene as the main final product below pH 13 and with the major products of 4-hydroxy-4-methyl-2-pentanone and bis(2-ethylhexyl) phthalate at pH 13.2.

show abstract

Section: Effect Of 30 Wt % H2o2 Dosage On Lignin Degradationsupporting

confidence: 92%

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Chen

Yan

2017

BioResources

View full text Add to dashboard Cite

show abstract

“…To improve the viability and yield efficiency of semiconductor-based photocatalysis for biomass pretreatment, efforts have been made to narrow the bandgap energy so that the light energy in the visible wavelength would be sufficient to induce photocatalysis, and to sustain the reactivity by effectively separating e − /h + . An Ag-AgCl/ZnO photocatalyst was synthesized by photo-reducing Ag + to Ag0 from AgCl deposited on ZnO particles (Li H. et al, 2015 ). The photocatalyst demonstrated complete lignin (alkali) degradation at an initial lignin concentration <50 mg/l upon irradiation with solar light for 150 min; evolution of total organic carbon (TOC) from the solution was linearly correlated with lignin degradation.…”

Section: Greener Oxidative Processes For Biomass Conversion-selectivimentioning

confidence: 99%

Lignocellulosic Biomass Transformations via Greener Oxidative Pretreatment Processes: Access to Energy and Value-Added Chemicals

et al. 2018

View full text Add to dashboard Cite

Anthropogenic climate change, principally induced by the large volume of carbon dioxide emission from the global economy driven by fossil fuels, has been observed and scientifically proven as a major threat to civilization. Meanwhile, fossil fuel depletion has been identified as a future challenge. Lignocellulosic biomass in the form of organic residues appears to be the most promising option as renewable feedstock for the generation of energy and platform chemicals. As of today, relatively little bioenergy comes from lignocellulosic biomass as compared to feedstock such as starch and sugarcane, primarily due to high cost of production involving pretreatment steps required to fragment biomass components via disruption of the natural recalcitrant structure of these rigid polymers; low efficiency of enzymatic hydrolysis of refractory feedstock presents a major challenge. The valorization of lignin and cellulose into energy products or chemical products is contingent on the effectiveness of selective depolymerization of the pretreatment regime which typically involve harsh pyrolytic and solvothermal processes assisted by corrosive acids or alkaline reagents. These unselective methods decompose lignin into many products that may not be energetically or chemically valuable, or even biologically inhibitory. Exploring milder, selective and greener processes, therefore, has become a critical subject of study for the valorization of these materials in the last decade. Efficient alternative activation processes such as microwave- and ultrasound irradiation are being explored as replacements for pyrolysis and hydrothermolysis, while milder options such as advanced oxidative and catalytic processes should be considered as choices to harsher acid and alkaline processes. Herein, we critically abridge the research on chemical oxidative techniques for the pretreatment of lignocellulosics with the explicit aim to rationalize the objectives of the biomass pretreatment step and the problems associated with the conventional processes. The mechanisms of reaction pathways, selectivity and efficiency of end-products obtained using greener processes such as ozonolysis, photocatalysis, oxidative catalysis, electrochemical oxidation, and Fenton or Fenton-like reactions, as applied to depolymerization of lignocellulosic biomass are summarized with deliberation on future prospects of biorefineries with greener pretreatment processes in the context of the life cycle assessment.

show abstract

“…In this work a quartz cube tungsten T3 halogen 100 W lamp was used, with 380-800 nm intensity [6]. The Li et al approach was followed for pretreatment conditions and circumstances [28] and light exposure was performed for 4 h. The TiO 2 -ZnO weight concentration during pretreatment was taken as 4% TiO 2 -ZnO to the volume of lignin taken (w/v) [4]. The prepared pretreatment mixture was further divided into four parts.…”

Section: Photo-catalytic Oxidation Of Commercial Ligninmentioning

confidence: 99%

Photocatalytic Pretreatment of Commercial Lignin Using TiO2-ZnO Nanocomposite-Derived Advanced Oxidation Processes for Methane Production Synergy in Lab Scale Continuous Reactors

et al. 2021

View full text Add to dashboard Cite

The photocatalytic pretreatment of lignocellulosic biomass to oxidize lignin and increase biomass stability has gained attention during the last few years. Conventional pretreatment methods are limited by the fact that they are expensive, non-renewable and contaminate the anaerobic digestate later on. The present study was focused to develop a metal-derived photocatalyst that can work with visible electromagnetic spectra light and oxidize commercial lignin liquor. During this project the advanced photocatalytic oxidation of lignin was achieved by using a quartz cube tungsten T3 Halogen 100 W lamp with a laboratory manufactured TiO2-ZnO nanoparticle (nanocomposite) in a self-designed apparatus. The products of lignin oxidation were confirmed to be vanillic acid (9.71 ± 0.23 mg/L), ferrulic acid (7.34 ± 0.16 mg/L), benzoic acid (6.12 ± 0.17 mg/L) and p-coumaric acid (3.80 ± 0.13 mg/L). These all products corresponded to 85% of the lignin oxidation products that were detectable, which is significantly more than any previously reported lignin pretreatment with even more intensity. Furthermore, all the pretreatment samples were supplemented in the form of feedstock diluent in uniformly operating continuously stirred tank reactors (CSTRs). The results of pretreatment revealed 85% lignin oxidation and later on these products did not hinder the CSTR performance at any stage. Moreover, the synergistic effects of pretreated lignin diluent were seen that resulted in 39% significant increase in the methane yield of the CSTR with constant operation. Finally, the visible light and nanoparticles alone could not pretreat lignin and when used as diluent, halted and reduced the methane yield by 37% during 4th HRT.

show abstract

Photocatalytic degradation of lignin on synthesized Ag–AgCl/ZnO nanorods under solar light and preliminary trials for methane fermentation

Cited by 68 publications

References 31 publications

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Graphene/Hemin Hybrid Material as a Catalyst for Degradation of Alkaline Lignin with Hydrogen Peroxide

Lignocellulosic Biomass Transformations via Greener Oxidative Pretreatment Processes: Access to Energy and Value-Added Chemicals

Photocatalytic Pretreatment of Commercial Lignin Using TiO2-ZnO Nanocomposite-Derived Advanced Oxidation Processes for Methane Production Synergy in Lab Scale Continuous Reactors

Contact Info

Product

Resources

About