Liu Cenwei

Bio: Liu Cenwei is an academic researcher. The author has contributed to research in topics: Biochar & Freundlich equation. The author has an hindex of 2, co-authored 9 publications receiving 24 citations.

Soil improvement agent for improving saline-alkali soil as well as preparation method and application of soil improvement agent

Abstract: The invention relates to a soil improvement agent for improving saline-alkali soil as well as a preparation method and application of the soil improvement agent. The preparation method comprises the following steps: (S1) crushing agricultural wastes, filtering, crushing shells to obtain shell powder, and preparing mixed liquid from the filtered agricultural wastes and the shell powder in a proportion; (S2) adding slaked lime and a superphosphate combined catalyst into the mixed liquid, and carrying out hydrothermal carbonizing treatment; (S3) cooling a hydrothermal carbonizing product, and carrying out solid-liquid separation, so as to respectively obtain a solid charcoal composite material and decomposition liquid; (S4) mixing the charcoal composite material, ardealite, egg shell, composted chicken manure, leaf mold and attapulgite, so as to obtain a mixture; and (S5) mixing the decomposition liquid with table vinegar to obtain a solution for liquid phase adjustment, adding the solution and the mixture into a disk granulating machine, and carrying out disk granulation and drying, so as to obtain the soil improvement agent. According to the soil improvement agent, the alkalinity and salt content of saline-alkali soil can be effectively reduced.

Adsorbent used for biogas digester, preparation method and application thereof

Abstract: The invention relates to an adsorbent used for a biogas digester, a preparation method and an application thereof. The adsorbent is prepared by adopting algal straw, FeSO4, Fe2(SO4)3, sodium alginateand aluminosilicate, and can effectively adsorb ammonia nitrogen, heavy metals and phosphorus in waste water.

Adsorbent, preparation method and application of adsorbent

Abstract: The invention relates to an adsorbent, a preparation method and an application of the adsorbent. The adsorbent is prepared from straws of duckweed, FeSO4, Fe2(SO4)3 and sodium alginate. The adsorbentcan adsorb ammoniacal nitrogen and heavy metals in a fen without a high cost.

A critical review of biosorption of dyes, heavy metals and metalloids from wastewater as an efficient and green process

Abstract: Wastewater contains many organic and inorganic pollutants and discharging them into received waters leads to serious environmental problems. The wastewater that is produced from various industries contains a noticeable amount of dyes; heavy metals and metalloids this has remained one of the major environmental problems facing public health. Unfortunately, the conventional wastewater remediation process is unable to remove dyes and heavy metals completely. One of the widely used water treatment technologies is biosorption, biosorbents are considered to be an emerging green, cost-effective, and efficient alternative. Therefore, the search for locally or regionally available biomasses for heavy metals/metalloids and dyes removal gained rapid attention. Methylene blue, Crystal violet, Reactive black 5, and Congo red; Cd, Cr, Cu, Pb, Hg, Ni, and Zn; and As were selected as examples for dyes, heavy metals, and metalloids, respectively, In this regard, a comprehensive understanding of the biosorption capability of different biosorbents is necessary to know how they can remove inorganic and organic contaminants in wastewater. Biosorption is an ion exchange, complexation, and coordination process. Besides, the recent advances in various biomaterials-based biosorbents and different approaches of pollutants removal from wastewater with several examples to provide a backdrop for future research have been reviewed. This can be beneficial for developing more effective technologies to eliminate contaminants, thus bridging the gap between laboratory results and industrial use. crustacean shells, algae, chitosan are the most effective biosorbents. These biosorbents can serve as good alternatives to synthetic materials for pollutants removal from wastewater.

Production, characterization, activation and environmental applications of engineered biochar: a review

Abstract: Increased industrial and domestic activities have induced pollution, global warming and resources depletion, calling for advanced remediation techniques. For instance, biochar synthesized from waste materials is an ecofriendly and low-cost material for the remediation of contaminants, yet raw biochar is poorly efficient. Therefore, biochar properties can be improved by ultrasonication, metal impregnation, surfactant modification, microwave, electrochemical and plasma treatment techniques. Biochar properties include adsorption capacity, active surface area, uniform distribution of pores, chemical attributes and mechanical stability. Engineered biochar thus exhibits high contaminant removal efficiency of 90–99%, tolerance to wide range of pH of 3–9 and high specific surface area of more than 400 cm3/g. For example, modified cornstalk biochar displays mercury adsorption capacity of 269.4 mg/g. The usage of magnetic biochar allows a β-estradiol adsorption capacity of 98.8 mg/g. Engineered biochar can act as an ecofriendly soil amendment and a highly efficient tool to recover contaminants from water systems.

Adsorption of cadmium and lead from aqueous solution using modified biochar: A review

Abstract: Cadmium (Cd) and lead (Pb) contaminations are disturbing environmental issues, which causes serious harm to aqueous systems and human health. Therefore, removing them from aqueous solution is essential to prevent its damage to the environment. Environmental adsorption research as one solution has seen a boom over the past decade. Using modified biochar has proved to be more suitable for the adsorption of cadmium and lead. Most of the studies apply a routine method such as kinetic and isotherm modelling to demonstrate the macroscopic trend of adsorption, often without elaborative evaluation of the effectiveness and characteristics of the models. This review compiles different adsorption kinetics and isotherms models and also presents their origins, modified versions, and their applicability in the liquid adsorption situation. The effect of experimental parameters and adsorption mechanisms are discussed to study the adsorption performances of modified biochar. The adsorption mechanism was majorly by surface precipitation, ion exchange, electrostatic attraction, complexation and physical adsorption. The adsorption was majorly endothermic and spontaneous. Additionally, preparation and regeneration of modified biochar are also presented to provide a direction for sustainable improvement. This paper summarizes with a note on challenges, prospects and future perspectives of adsorption of cadmium and lead pollutions.

Adsorption of cadmium and lead from aqueous solution using modified biochar: A review

Abstract: Cadmium (Cd) and lead (Pb) contaminations are disturbing environmental issues, which cause serious harm to aqueous systems and human health. Therefore, removing them from aqueous solution is essential to prevent their damage to the environment. Environmental adsorption research as one solution is promising and has been getting a lot of attention in the recent years. Using modified biochar has proved to be more suitable for the adsorption of cadmium and lead. In this review, the sources of cadmium and lead in the environment and their hazards have been elucidated. In addition, the preparation methods of modified biochar to remove Cd and Pb have been discussed. This review also presents the adsorption kinetics and isotherms results for the adsorption of Cd and Pb from aqueous solution using modified biochar. The effect of experimental parameters and adsorption mechanisms are also discussed in order to understand the adsorption performances of modified biochar in great detail. The adsorption mechanisms were surface precipitation, surface complexation, ion exchange, chelation, electrostatic attraction, inner sphere complexation, redox and physical adsorption. The adsorption was mainly endothermic and spontaneous. Additionally, the results on the regeneration of modified biochar are presented to provide a direction for sustainable improvement. Finally, this review article also provides the challenges, prospects and future perspectives of adsorption of cadmium and lead from aqueous solutions using the modified biochar.