Biochar pyrolyzed from MgAl-layered double hydroxides pre-coated ramie biomass (Boehmeria nivea (L.) Gaud.): Characterization and application for crystal violet removal

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BACKGROUND This article reports the synthesis and characterisation of titanium dioxide‐coated biochar composites (TBCs) by pyrolysing titanium dioxide‐treated biomass prepared by a modified sol–gel method. Their adsorptive and photocatalytic activities were evaluated based on the removal of safranine T (ST) from an aqueous solution with/without UV‐light irradiation. RESULTS Characterisation studies suggested that TiO2 was successfully loaded on the biochar substrate. The biochar and TiO2 contents of the composite significantly affected its performance. The ST removal capabilities of the TBCs with 1, 1.5, 2, and 2.5 g of the biomass are 1.7, 2.3, 7.2, and 2.3 times better than that of the raw biochar, respectively. Thus, the optimum amount of biomass in TBC‐x was determined to be 2 g, with the corresponding sample exhibiting excellent stability, effectiveness over a wide pH range, and a maximum ST removal capacity of 226.7 mg g‐1. CONCLUSION The loading of TiO2 significantly enhanced the adsorption performance of biochar and the high specific surface area of the biochar synergistically promoted the photocatalytic activity of TiO2. Both adsorption and photocatalytic degradation were confirmed to contribute to the decolourisation of the aqueous solution because of the removal of ST, with the effect of adsorption being slightly higher than that of photocatalysis. The synthesised composite is a promising alternative material for removing chemical contaminants. © 2017 Society of Chemical Industry

“…Raw BC used for the synthesis was obtained as described elsewhere . The ramie bars used as the biomass were obtained from farms in Changsha City, Hunan Province, China.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…Raw BC used for the synthesis was obtained as described elsewhere. [26][27][28] The ramie bars used as the biomass were obtained from farms in Changsha City, Hunan Province, China. After air-drying at room temperature, the biomass was ground and sieved through a 100 mesh sieve (0.149 mm).…”

Section: Synthesis Of Tio 2 -Coated Biochar Compositesmentioning

confidence: 99%

Titanium dioxide‐coated biochar composites as adsorptive and photocatalytic degradation materials for the removal of aqueous organic pollutants

Cai

Jiang

Liu

et al. 2017

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“…Some conventional treatments reported in the literatures include biodegradation, membrane techniques, chemical oxidation, and photodegradation . Adsorption is one of the most practical and economical methods to remove pollutants, such as heavy metals, inorganics and organics, from liquid media. Various materials have been used as adsorbents to remove antibiotics .…”

Section: Introductionmentioning

confidence: 99%

Comparative study of rice husk biochars for aqueous antibiotics removal

Zeng

Tian

Liu

et al. 2017

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BACKGROUND Antibiotics are widely used for the treatment of bacterial infections in humans and animals, but it can be released into water sources due to incomplete metabolism in humans or via discharge from drug manufacturers. RESULTS The efficiency of removal of three antibiotics was enhanced with increasing biochar dosage. The adsorption of three antibiotics by RH700 was much higher than by RH300 and RH500, which might be due to the larger surface area and adsorption pore volume of RH700 (211.76 m2 g‐1 and 6.25 nm, respectively). In addition, the adsorption capacity was greatly affected by the solution pH, background electrolyte and humic acid. The kinetics experiment data were well fitted by the pseudo‐second‐order kinetic model. The maximum adsorption capacities of tetracycline hydrochloride (TC), doxycycline hydrochloride (DC) and ciprofloxacin (CF) based on the Langmuir model by RH700 at 318 K were 80.9, 85.2 and 36.1 mg g‐1, respectively. RH700 exhibited high affinity for antibiotics, mainly ascribed to the chemical interaction between oxygen‐containing functional groups (phenolic hydroxyl group, carboxyl and alkoxy groups) of the biochar surface and TC, DC and CF. CONCLUSION The rice husk biochar produced at high temperature could be applied as a potential adsorbent for removal of antibiotics from water. © 2017 Society of Chemical Industry

“…Over the past several decades, many advanced technologies have been used in wastewater treatment, such as adsorption, coprecipitation and membrane filtration . The membrane filtration process gained its popularity for its low‐energy requirement, high separation efficiency, no phase changing, device simplicity, and environmental friendly properties .…”

Section: Introductionmentioning

confidence: 99%

“…Over the past several decades, many advanced technologies have been used in wastewater treatment, such as adsorption, coprecipitation and membrane filtration. [1][2][3][4] The membrane filtration process gained its popularity for its low-energy requirement, high separation efficiency, no phase changing, device simplicity, and environmental friendly properties. 5,6 Although membrane bioreactors (MBRs) and other filtration processes, such as reverse osmosis (RO), nanofiltration (NF) and ultrafiltration (UF), have been in commercial use for several decades, [5][6][7][8] membrane biofouling still remains an intractable problem that limits their development.…”

Section: Introductionmentioning

confidence: 99%

Quorum quenching activity of indigenous quorum quenching bacteria and its potential application in mitigation of membrane biofouling

Huang

Zeng

et al. 2018

BACKGROUND Quorum sensing (QS) could regulate gene expression so as to mediate some bacterial behaviors such as the production of extracellular polymeric substances (EPS) and biofilm formation. In this study, a quorum quenching (QQ) bacterium was isolated from an indigenous lab‐scale membrane bioreactor (MBR) and encapsulated in a dumpling‐shaped microbial bag for biofouling control. RESULTS This QQ bacteria has a higher genetic homology with Acinetobacter bereziniae strain. The effect of time and temperature on the QQ activity of the microbial bag was tested by degrading N‐acyl homoserine lactone (AHL). The results showed the degradation of C8‐HSL (N‐Octanoyl‐DL‐homoserine lactone) and C6‐HSL (N‐Hexanoyl‐L‐homoserine lactone) could reach equilibrium within 2 h. In addition, a suitable temperature for AHL degradation was 20 °C, at which the rate of degradation of C6‐HSL and C8‐HSL by the microbial bag was 88% and 69%, respectively. The antifouling efficiency of the microbial bag was investigated by a constant pressure filtration system. With the microbial bag added, the decrease of permeability was obviously improved. After 14 days, the permeability with QQ decreased to 18% while the control experiment exhibited almost no permeability. CONCLUSION The excellent AHL degradation rate and the filtration test showed that this QQ bacteria has an excellent antifouling potential in membrane filtration systems. © 2017 Society of Chemical Industry