Dramatically increased CO2 concentration from several point sources is perceived to cause severe greenhouse effect towards the serious ongoing global warming with associated climate destabilization, inducing undesirable natural calamities, melting of glaciers, and extreme weather patterns. CO2 capture and utilization (CCU) has received tremendous attention due to its significant role in intensifying global warming. Considering the lack of a timely review on the state-of-the-art progress of promising CCU techniques, developing an appropriate and prompt summary of such advanced techniques with a comprehensive understanding is necessary. Thus, it is imperative to provide a timely review, given the fast growth of sophisticated CO2 capture and utilization materials and their implementation. In this work, we critically summarized and comprehensively reviewed the characteristics and performance of both liquid and solid CO2 adsorbents with possible schemes for the improvement of their CO2 capture ability and advances in CO2 utilization. Their industrial applications in pre- and post-combustion CO2 capture as well as utilization were systematically discussed and compared. With our great effort, this review would be of significant importance for academic researchers for obtaining an overall understanding of the current developments and future trends of CCU. This work is bound to benefit researchers in fields relating to CCU and facilitate the progress of significant breakthroughs in both fundamental research and commercial applications to deliver perspective views for future scientific and industrial advances in CCU.

Industrial carbon dioxide capture and utilization: state of the art and future challenges

Carbon dioxide (CO2) is the major contributor to greenhouse gas (GHG) emissions and the main driver of climate change. Currently, CO2 utilization is increasingly attracting interest in processes like enhanced oil recovery and coal bed methane and it has the potential to be used in hydraulic fracturing processes, among others. In this review, the latest developments in CO2 capture, utilization, conversion, and sequestration are examined through a multi-scale perspective. The diverse range of CO2 utilization applications, including mineralization, biological utilization, food and beverages, energy storage media, and chemicals, is comprehensively presented. We also discuss the worldwide research and development of CO2 utilization projects. Lastly, we examine the key challenges and issues that must be faced for pilot-scale and industrial applications in the future. This study demonstrates that CO2 utilization can be a driver for the future development of carbon capture and utilization technologies. However, considering the amount of CO2 produced globally, even if it can be reduced in the near-to mid-term future, carbon capture and storage will remain the primary strategy and, so, complementary strategies are desirable. Currently, the main CO2 utilization industry is enhanced oil and gas recovery, but considering the carbon life cycle, these processes still add CO2 to the atmosphere. In order to implement other CO2 utilization technologies at a large scale, in addition to their current technical feasibility, their economic and societal viability is critical. Therefore, future efforts should be directed toward reduction of energy penalties and costs, and the introduction of policies and regulation encouraging carbon capture, utilization and storage, and increasing the public acceptance of the strategies in a complementary manner.

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Recent advances in carbon dioxide utilization

This paper presents a comprehensive list of Carbon Capture and Utilization technologies and applications, ranging from lab-scale R&D activities reported in academic papers to commercially establish...

Carbon capture and utilization technologies: a literature review and recent advances

Pretreatment with 0.5 mM salicylic acid (SA) for 3 days significantly enhanced the growth and tolerance to subsequent drought stress (PEG-6000, 15%) in wheat seedlings, manifesting as increased shoot and root dry weights, and decreased lipid peroxidation. Total proteins from wheat leaves exposed to (i) 0.5 mM SA pretreatment, (ii) drought stress, and (iii) 0.5 mM SA treatment plus drought-stress treatments were analyzed using a proteomics method. Eighty-two stress-responsive protein spots showed significant changes, of which 76 were successfully identified by MALDI-TOF-TOF. Analysis of protein expression patterns revealed that proteins associated with signal transduction, stress defense, photosynthesis, carbohydrate metabolism, protein metabolism, and energy production could by involved in SA-induced growth and drought tolerance in wheat seedlings. Furthermore, the SA-responsive protein interaction network revealed 35 key proteins, suggesting that these proteins are critical for SA-induced tolerance.

Proteomics reveals the effects of salicylic acid on growth and tolerance to subsequent drought stress in wheat.

CO2 mineral carbonation using industrial solid wastes: A review of recent developments

The carbonation Mg-rich natural minerals or industrial wastes is an attractive route to store CO2. Recently, an approach involving the indirect mineral carbonation of serpentine with recyclable (NH4)2SO4 or NH4HSO4 is receiving widespread attention. In this study, the solubilities associated with the mineral process (ternary system of (NH4)2SO4–MgSO4–H2O) were measured and calculated using the isothermal method and Pitzer model, respectively. The effects of adding small amounts of H2SO4 and iron sulfate on the solubilities were evaluated. The results showed that the crystalline region of MgSO4·(NH4)2SO4·6H2O (boussingaultite) is larger than those of the other species, which indicates that boussingaultite is crystallized out easily. The presence of H2SO4 at a concentration of up to 10 wt % and iron sulfate of 2.5 wt % almost had no effect of the solubilities. The minimal ratios of liquid to solid during the leaching unit were calculated as 3.45, 2.19, and 1.36 mL/g at 25, 55, and 80 °C, respectively. Compa...

Phase Equilibrium of the MgSO4–(NH4)2SO4–H2O Ternary System: Effects of Sulfuric Acid and Iron Sulfate and Its Application in Mineral Carbonation of Serpentine

Removal of chloride from simulated acidic wastewater in the zinc production

A route for the indirect carbonation of different minerals using (NH4)2SO4 (AS) as a recyclable reagent has been recently proposed. For saving energy, the extraction of alkaline components, such as...

Insights into the Roasting Kinetics and Mechanism of Blast Furnace Slag with Ammonium Sulfate for CO2 Mineralization

Coal fly ash (CFA) is the powdery waste generated in coal-fired power plants. The content of Al2O3 in CFA can be up to 40 wt % and can serve as an alternative to bauxite for aluminum production. Re...

Phase Diagrams of (NH4)2SO4–Al2(SO4)3–H2O Ternary System: Effect of Sulfuric Acid and Its Application in Recovery of Aluminum from Coal Fly Ash

Rubidium is a critical mineral due to its important role in the rubidium atomic clock in global positioning systems. In our previous study, lithium, rubidium, cesium were extracted simultaneously from lepidolite by a sulfuric acid baking process; a sulfate solution with 10.26 g/L-Rb+ and 40.74 g/L-K+ was obtained after recovery of lithium and cesium. As the continuity of this research, solvent extraction was used to separate rubidium from the above solution with high concentrations of Rb+ and K+ in this study. An organic phase with 1 mol/L 4-tert-butyl-2-(α-methylbenzyl)-phenol was introduced to extract the rubidium. The Rb+ extraction efficiency reached 97.02%, with 17.28% K+ co-extracted after a four-stage countercurrent extraction. The rubidium-loaded organic phase was then scrubbed with water, and the scrubbing efficiency of the potassium was 96.17%, with 7.25% of rubidium lost. After potassium scrubbing, a potassium-depleted organic phase with 3.2 g/L-Rb+ and 0.093 g/L-K+ was obtained. Almost all the rubidium could be stripped from the organic phase using 0.1 mol/L sulfuric acid. A rubidium sulfate product with a purity of 98.17 wt.% was obtained by evaporation and crystallization of the stripping solution. Finally, an integrated process for recovery of lithium, cesium, and rubidium from lepidolite was proposed.

Weizao Liu

Papers

Phase Equilibrium of the MgSO4–(NH4)2SO4–H2O Ternary System: Effects of Sulfuric Acid and Iron Sulfate and Its Application in Mineral Carbonation of Serpentine

Removal of chloride from simulated acidic wastewater in the zinc production

Insights into the Roasting Kinetics and Mechanism of Blast Furnace Slag with Ammonium Sulfate for CO2 Mineralization

Phase Diagrams of (NH4)2SO4–Al2(SO4)3–H2O Ternary System: Effect of Sulfuric Acid and Its Application in Recovery of Aluminum from Coal Fly Ash

Solvent extraction of rubidium from a sulfate solution with high concentrations of rubidium and potassium using 4-tert-butyl-2-(α-methylbenzyl)-phenol