Elemental mercury (Hg) removal from coal syngas using magnetic tea-biochar: Experimental and theoretical insights.

Mercury is ranked 3 as a global pollutant because of its long persistence in the environment. Approximately 65% of its anthropogenic emission (Hg) to the atmosphere is from coal-thermal power plants. Thus, the Hg emission control from coal-thermal power plants is inevitable.

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg) Removal, and Regenerable Performance of Magnetic Tea Biochar.

Elemental mercury (Hg) removal from a hot gas is still challenging since high temperature influences the Hg removal and regenerable performance of the sorbent. In this work, a facile yet innovative sonochemical method was developed to synthesize a thermally stable magnetic tea biochar to capture the Hg from syngas. A sonochemically synthesized magnetic sorbent (TUF) exhibited a more prodigious surface area with developed pore structures, ultra-paramagnetic properties, and high dispersion of FeO/γ-FeO particles than a simply synthesized magnetic sorbent (TF).

Recent Advances in Fly-Ash-Based Geopolymers: Potential on the Utilization for Sustainable Environmental Remediation.

This Mini-Review provides the fundamentals and the state-of-the-art overview on geopolymers, novel inorganic polymeric materials (also known as alkali-bounded ceramics), synthesized from aluminosilicate sources and explores their current and potential sustainable environmental applications. It summarizes and examines concisely the recent scientific advances on geopolymers widely synthesized from abundantly available fly-ash-based aluminosilicate materials via alkaline activation at relatively low temperatures. Although geopolymerization is not a new concept and has offered valuable solutions to some environmental challenges as a low-cost and environmentally benign alternative to conventional energy-intensive Portland cement-based construction materials and has also been used as a barrier in immobilizing toxic and radioactive metals, the application of this technology to produce effective adsorptive materials for mitigation of liquid- and gas-phase contaminants is relatively recent.

Simultaneous NO and SO removal by aqueous persulfate activated by combined heat and Fe: experimental and kinetic mass transfer model studies.

This study evaluates the chemistry, kinetics, and mass transfer aspects of the removal of NO and SO simultaneously from flue gas induced by the combined heat and Fe activation of aqueous persulfate. The work involves experimental studies and the development of a mathematical model utilizing a comprehensive reaction scheme for detailed process evaluation, and to validate the results of an experimental study at 30-70 °C, which demonstrated that both SO and Fe improved NO removal, while the SO is almost completely removed. The model was used to correlate experimental data, predict reaction species and nitrogen-sulfur (N-S) product concentrations, to obtain new kinetic data, and to estimate mass transfer coefficient (Ka) for NO and SO at different temperatures.

Simultaneous removal of NO and SO from flue gas by combined heat and Fe activated aqueous persulfate solutions.

The use of advanced oxidation processes (AOPs) to integrate flue gas treatments for SO, NO and Hg into a single process unit is rapidly gaining research attention. AOPs are processes that rely on the generation of mainly the hydroxyl radical. This work evaluates the effectiveness of the simultaneous removal of NO and SO from flue gas utilizing AOP induced by the combined heat and Fe activation of aqueous persulfate, and elucidates the reaction pathways.

A new method of analysis of peroxydisulfate using ion chromatography and its application to the simultaneous determination of peroxydisulfate and other common inorganic ions in a peroxydisulfate matrix.

A new method for the determination of peroxydisulfate using ion chromatography has been developed. Elution of peroxydisulfate was effected by isocratic elution using 200 mM NaOH at 40°C. A modification of the method using gradient elution was able to simultaneously determine other common inorganic ions (nitrate, nitrite, sulfate and chloride) down to significantly low concentrations in a peroxydisulfate matrix.

Advanced oxidation processes (AOPs) involving ultrasound for waste water treatment: a review with emphasis on cost estimation.

Two things are needed for any technology to be suitable for use in the industry, viz. 1. Technical feasibility and 2.

Ultrasound-induced aqueous removal of nitric oxide from flue gases: effects of sulfur dioxide, chloride, and chemical oxidant.

The effects of sulfur dioxide (SO(2)), sodium chloride (NaCl), and peroxymonosulfate or oxone (2KHSO(5).KHSO(4).K(2)SO(4) with active ingredient, HSO(5)(-)) on the sonochemical removal of nitric oxide (NO) have been studied in a bubble column reactor.

Sonochemistry in environmental remediation. 2. Heterogeneous sonophotocatalytic oxidation processes for the treatment of pollutants in water.

Recent advances in advanced oxidation technologies for applications in environmental remediation involve the use of acoustic cavitation. Cavitation is the formation, growth, and implosive collapse of gas- or vapor-filled microbubbles formed from acoustical wave-induced compression/ rarefaction in a body of liquid. Cavitation is effective in treating most liquid-phase pollutants but it is highly energy intensive and not economical or practically feasible when used alone.

Sonochemistry in environmental remediation. 1. Combinative and hybrid sonophotochemical oxidation processes for the treatment of pollutants in water.

Sonoprocessing is the utilization of sonic and ultrasonic waves in chemical synthesis and processes. It is a new and rapidly growing research field with broad applications in environmental engineering, green chemical synthesis, and processing. The application of this environmentally benign technique in environmental remediation is currently under active research and development.

Destruction of carbon disulfide in aqueous solutions by sonochemical oxidation.

Carbon disulfide (CS(2)) is toxic to animals and aquatic organisms, and can also decompose to carbonyl sulfide (OCS) and hydrogen sulfide (H(2)S) in aqueous environment. The kinetics of the sonochemical degradation of aqueous CS(2) was studied in a batch reactor at 20kHz and 20 degrees C, and the effects of process parameters (e.g.