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In recent years, the formulation of innovative photocatalysts activated by visible or solar light has been attracting increasing attention because of their notable potential for environmental remediation and use in organic synthesis reactions. Generally, the strategies for the development of visible-light-active photocatalysts are mainly focused on enhancing degradation efficiency (in the case of environmental remediation) or increasing selectivity toward the desired product (in the case of organic synthesis). These goals can be achieved by doping the semiconductor lattice with metal and/or non-metal elements in order to reduce band gap energy, thereby providing the semiconductor with the ability to absorb light at a wavelength higher than the UV range. Other interesting options are the formulation of different types of heterojunctions (to increase visible absorption properties and to reduce the recombination rate of charge carriers) and the development of innovative catalytic materials with semiconducting properties. This reprint is focused on visible-light-active photocatalysts for environmental remediation and organic synthesis, featuring the state of the art as well as advances in this field.

Technology: general issues --- History of engineering & technology --- Materials science --- TiO2 --- activated carbon --- nanohybrid --- photodegradation --- azo dyes --- sunlight --- photocatalysis --- visible light --- biomass --- waste --- green chemistry --- nanocatalysis --- nitrobenzene --- Ag/Cu2O --- persulfate --- sulfate radical --- heterostructure --- diamond nanocrystals --- bacterial photoinactivation --- sillenite Bi12NiO19 --- Rietveld method --- optical properties --- BB41 dye --- electrospinning --- carbon composite nanofibers --- water pollution --- Ag3PO4 --- photocatalyst --- C3N4 --- MoS2 --- composite --- photocatalytic oxidation --- Cr(VI) reduction --- cobalt --- decolorization --- Remazol Black --- sulfur --- hydrophosphination --- zirconium --- phosphines --- TiO2 thin film --- oxygen and argon gas flow rates --- acetaminophen --- photocatalytic activity --- response surface method --- Box-Behnken design --- TiO2 --- activated carbon --- nanohybrid --- photodegradation --- azo dyes --- sunlight --- photocatalysis --- visible light --- biomass --- waste --- green chemistry --- nanocatalysis --- nitrobenzene --- Ag/Cu2O --- persulfate --- sulfate radical --- heterostructure --- diamond nanocrystals --- bacterial photoinactivation --- sillenite Bi12NiO19 --- Rietveld method --- optical properties --- BB41 dye --- electrospinning --- carbon composite nanofibers --- water pollution --- Ag3PO4 --- photocatalyst --- C3N4 --- MoS2 --- composite --- photocatalytic oxidation --- Cr(VI) reduction --- cobalt --- decolorization --- Remazol Black --- sulfur --- hydrophosphination --- zirconium --- phosphines --- TiO2 thin film --- oxygen and argon gas flow rates --- acetaminophen --- photocatalytic activity --- response surface method --- Box-Behnken design

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This book examines the state of the art of biosorption as an economical and environmentally friendly technique for pollutant removal in wastewater. Several articles are included that develop the applications of biosorption showing the high efficiency and versatility of this process, as well as showing recent advances in this field. Different modalities of biosorption are demonstrated from free biomass to immobilized biomass, as well as the combination of biomass with modern materials to form composites, emphasizing the significant versatility of this technique. In addition, different examples with biomasses of very different natures are also included and discussed, as are the factors that influence biosorption processes. Other contributions offer some examples of apparently useless materials that are reused and applied in the elimination of pollutants. Therefore, this book is an excellent complement for those researchers who work on biosorption as well as a starting point for those who want to begin research on this topic.

landfill --- leachate treatment --- POME --- removal efficiency --- mixing ratio --- biosorbent --- Ni2+ --- background electrolytes --- kinetic modeling --- biosorption --- biomass --- bioaccumulation --- biocomposite --- pollutants --- metals --- emerging organic contaminants --- dyes --- Spirulina --- alginate --- immobilization --- fixed-bed column --- Mxene–CS composite --- Cr(VI) contaminated aqueous solution --- Green Synthesis --- treatment of wastewater --- heavy metals --- citrus waste biomass --- bio-sorbent --- pre-treatment --- activated carbon --- batch adsorption --- fixed-bed adsorption column --- n/a --- Mxene-CS composite

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Soil, water, and nitrogen management are critical for crop productivity and quality in horticulture as well as for reducing negative impacts on ecosystems and greenhouse gas emissions. This Special Issue is a collection of seven important research works addressing solutions or strategies that can be implemented in order to use these three factors of production in a more sustainable way and to reduce inorganic nitrogen applications by considering the great importance of circular agriculture and the use of microorganisms. Aside from the relevance of the topics in this Special Issue, the studies included within it may trigger the development of new strategies for more sustainable and environmentally friendly intensive agriculture.

Technology: general issues --- History of engineering & technology --- Environmental science, engineering & technology --- drip irrigation --- arbuscular mycorrhizal fungi --- water relations --- N and P status --- soil organic carbon --- osmoregulation --- sugar accumulation --- water stress --- xylem tissue --- mulching film --- Trichoderma --- Lactuca sativa L. --- nitrogen dose --- nutritional quality --- yield --- sustainability --- by-products --- recycle --- smart agriculture --- nitrogen efficiency --- soil organic matter --- acidic soil --- pH --- nitrogen --- nutrient uptake --- photosynthetic pigments --- antioxidant activity --- Spinacia oleracea --- hexavalent Cr --- photosynthesis --- phosphorus uptake --- Cr(VI) tissue --- leaf characteristics --- purslane --- soil contamination --- heavy metals --- Ginger (Zingiber officinale) --- biochar --- plant growth --- root morphological traits --- chlorophyll content --- soil enzymes --- n/a

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Water is indispensable to the functioning of most known life forms, and good water quality is essential to human health, social and economic development, and ecosystem functioning. Nonetheless, population growth has been leading to the degradation and depletion of fresh water resources. Under these circumstances, ensuring sufficient and safe water supplies for everyone is one of the Sustainable Development Goals (SDGs) set by the United Nations General Assembly in 2015 for the year 2030. For this goal to be achieved, the development and implementation of appropriate and efficient wastewater treatments that allow us to reduce water pollution is a major challenge.In view of the relevant contribution that polymers and polymeric materials may have in the conservation of the aquatic environment, namely by their application in wastewater treatment, original research and review papers on “Current trends and perspectives in the application of polymeric materials for wastewater treatment” were here brought together. For sure, this set of papers will be helpful and inspiring for readers interested in this topic.

Technology: general issues --- waste silk --- dopamine --- iron particles --- wastewater treatment --- activated carbon microsphere --- sodium lignosulfonate --- Cr(VI) --- adsorption --- modified polymeric resin --- t-butyl phosphate impregnation --- polymer based adsorbents --- dye adsorption --- response surface methodology --- nano-MgO --- structural modification --- permeability --- antifouling --- color rejection --- POME --- fluoroquinolones --- ultrasound radiation --- mesoporous carbon --- desirability function --- thermodynamics --- wastewater --- cost analysis --- ciprofloxacin --- Polystyrene nanocomposite --- modifications --- characterizations --- antibiotics --- emerging contaminants --- pharmaceuticals --- polymeric adsorbents --- magnetization --- silver nanoparticles --- microfiltration --- membranes --- biofouling --- sputtering --- magnetite --- co-precipitation method --- Rhodamine B --- sodium dodecyl sulfate --- selective adsorption --- dysprosium --- neodymium --- fabric adsorbent --- radiation --- graft polymerization --- molecular imprinting --- polymer --- sertraline --- cross-reactivity --- SSRI --- template --- sorbent --- n/a

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Soil, water, and nitrogen management are critical for crop productivity and quality in horticulture as well as for reducing negative impacts on ecosystems and greenhouse gas emissions. This Special Issue is a collection of seven important research works addressing solutions or strategies that can be implemented in order to use these three factors of production in a more sustainable way and to reduce inorganic nitrogen applications by considering the great importance of circular agriculture and the use of microorganisms. Aside from the relevance of the topics in this Special Issue, the studies included within it may trigger the development of new strategies for more sustainable and environmentally friendly intensive agriculture.

drip irrigation --- arbuscular mycorrhizal fungi --- water relations --- N and P status --- soil organic carbon --- osmoregulation --- sugar accumulation --- water stress --- xylem tissue --- mulching film --- Trichoderma --- Lactuca sativa L. --- nitrogen dose --- nutritional quality --- yield --- sustainability --- by-products --- recycle --- smart agriculture --- nitrogen efficiency --- soil organic matter --- acidic soil --- pH --- nitrogen --- nutrient uptake --- photosynthetic pigments --- antioxidant activity --- Spinacia oleracea --- hexavalent Cr --- photosynthesis --- phosphorus uptake --- Cr(VI) tissue --- leaf characteristics --- purslane --- soil contamination --- heavy metals --- Ginger (Zingiber officinale) --- biochar --- plant growth --- root morphological traits --- chlorophyll content --- soil enzymes --- n/a