Publications by authors named "Haowen Guo"
Enzyme-induced carbonate precipitation (EICP) has been studied in the remediation of heavy metals in recent years. This study aims to investigate the impact of EICP with jack bean urease (JU) and sword bean urease (SU) on the Zn remediation. The results show that relatively high concentration of organic molecules in SU can protect urease from deactivation and absorb Zn.
View Article and Find Full Text PDFArticle Synopsis
- Enzyme-induced carbonate precipitation (EICP) is being explored for cleaning up heavy metal contamination in soil and water, focusing on the roles of Zn, Ni, and Cr(VI) in contaminated sand using urease from sword beans.
- The study found that increased calcium levels improved heavy metal immobilization percentages, achieving impressive results after several treatment cycles: nearly complete immobilization of Zn and significant percentages for Ni and Cr(VI).
- Analytical methods revealed the formation of carbonate precipitates and metallic oxides during the process, supporting the idea that EICP works through biomineralization, adsorption, and complexation, while simultaneously increasing the strength of the treated sand.
Article Synopsis
- 2D violet phosphorus (VP) is gaining attention in photonic and optoelectronic devices due to its unique optical and electrical properties, which were studied for ultrafast carrier dynamics and nonlinear optical absorption.
- Measurements showed ultrafast relaxation times of ~6.83 ps and ~62.91 ps, along with significant saturable absorption characteristics, indicated by parameters like a nonlinear absorption coefficient of -2.18 × 10 cm/MW and saturation intensity of 329 kW/cm.
- The successful use of 2D VP nanosheets in a passively Q-switched Nd:YVO laser demonstrated an average output power of 700 mW and pulse duration of 478 ns, highlighting its potential for ultr
Carbon emissions from landfill construction and management have become a global concern. Life cycle analysis (LCA) has been widely used to assess the environmental impacts of engineered infrastructures over their lifetimes. LCA has also been applied to landfill leachate and gas management, but rarely to landfill final cover systems.
View Article and Find Full Text PDFBiochar has been used as a sustainable amendment to mitigate environmental risks, improve plant growth and soil properties. This study conducted laboratory column tests to investigate the effects of plant-biochar interactions on shrub growth, hydraulic properties and nutrient contents of recycled concrete aggregates (RCAs). In total, three test conditions, namely, vegetated RCA without biochar (R), with 5 % biochar (R5) and 10 % biochar (R10) were subject to drying.
View Article and Find Full Text PDFArticle Synopsis
- Atomically thin BiOSe is a promising 2D material for optical applications, featuring a strong nonlinear optical response and high carrier mobility.
- Researchers used BiOSe nanoplates as a saturable absorber in a femtosecond laser, boosting average power from 421 mW to 665 mW and reducing pulse width from 587 fs to 266 fs after defect regulation.
- The study highlights that modifying defects in BiOSe improves performance metrics like saturation intensity and accelerates photocarrier dynamics, leading to efficient mode-locked laser operation.
Volume changes of biochar-amended landfill cover soil under a thermal cycle.
Waste Manag Res
December 2018
Biochar has been identified as a favourable amendment for landfill cover soils. So far, the effects of biochar on soil response to temperature variations are still unclear. Waste heat generates when municipal solid waste decomposes, and the temperature of landfill can increase up to 90°C.
View Article and Find Full Text PDF